Dual Element Microphone
Dual Element Microphone
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 Dual Wireless Headset Handheld VHF Microphone System  US $154.95
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 Dual Wireless Microphone System Handheld VHF AC Rec 1YR US $154.95
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 Blue Snowball Bundl USB mic microphone Brushed Aluminum US $32.00
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 Rode NT4 Condenser Cable Professional Microphone US $450.00
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 Shure 99s556 Controlled Magnetic Transducer Mic Microphone Element 1200 OHM US $45.00
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 Samson Stage 5H Professional VHF Wireless Vocal Microphone System CH 6 US $34.95
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 Audio Technica ATW 3110b Microphone US $370.00
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 Rode Classic II Limited Collectors Edition valve condenser mic ex display MINT US $1,738.31
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 AirLine 77 UHF Wireless Headset System Vocals Aerobics Fitness Pilates US $189.00
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 Blue Microphones Snowball Plug Play USB Black KIT NEW US $99.99
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 Samson Wireless Airline 77 Aerobics Headset System N5 US $215.99
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 Blue Snowball Bundle USB mic microphone Gloss Black US $124.95
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 Audio Technica AT4060 Tube Condensor Microphone US $969.00
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 Blue Snowball Bundle USB mic Textured White microphone US $124.95
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 Audio Technica AT4047SV Condenser Cable Professional Microphone US $575.00
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 Dual Headset mic Yam Headworn for sennheiser SET EW100G2 EW300 G2 EW300 G2 SKM US $28.99
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 Stellar CM 6 EF86 EF806 Tube Condensor Microphone US $415.99
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 Samson Wireless Airline 77 Aerobics Headset System N1 US $215.99
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 Blue Snowball Bundl USB mic microphone Brushed Aluminum US $129.95
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 Peavey PCX U12 Wireless Lapel System US $190.00
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 NEW Audio Technica AT4047 SV Condenser Microphone US $539.00
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 DELUXE Samson CO3U Podcast PAK KIT USB C03U Mic NEW US $169.95
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 ATW 251 T8 Audio Technica Wireless System with Receiver and Unipak Transmitter US $29.99
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 Audio Technica AT2050 Condenser Microphone w Mic Stand XLR Cable Pop Filter US $229.00
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 Realistic Dual Pattern Stereo Electret Microphone 33 919A Cast Iron Desk Stand US $9.95
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 Audio Technica AT4047 SV Cardoid Condenser Mic AT 4047 AT4047SV US $498.00
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 NEW Shure PG288 PG58 Dual Vocal Wireless Mic System US $489.49
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 New PreSonus DigiMax D8 8 Channel Preamplifier Make Offer 4 Best Price US $399.95
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 AUDIO TECHNICA AT4047 SV CARDIOD STUDIO CONDENSER MICROPHONE US $152.00
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 Audio Technica AT4060 Tube Microphone US $1.54
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 CAD Trion 7000 Dynamic Dual Element Ribbon Microphone in case Pre Owned US $26.00
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 3 Audio Technica ATW 252 T2 ATW 252 T3 ATW 252 T8 Handheld Microphone System US $229.95
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 Samson AirLine 77 Wireless Wind Instrument System CH N1 US $299.00
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 SW05SHCM SAMSON STAGE 5H WIRELESS MICROPHONE SYSTEM CHANEL 8 US $27.99
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 AUDIO TECHNICA FREEWAY Series 200 VHF Micrphone System US $149.99
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 AKG C 3000 B Condenser Professional Microphone Calibrated Excellent Condition US $149.00
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 SAMSON Airline 77 Headset Wireless System Airline77 PROAUDIOSTAR US $269.00
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 Audio Technica ATW3141 Wireless Handheld Microphone US $349.00
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 Dual Headset Mic FOR Sennheiser Wireless Mics EW100 G2EW300 G2EW100 G3 US $24.89
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 Nady SGM 12 Shotgun Condenser Microphone US $29.99
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 AV JEFES AVL800 On Camera Directional Shotgun Condenser Microphone US $59.00
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 Beyerdynamic M160 M 160 Hypercardioid Ribbon Mic IN STOCK NYC PROAUDIOSTAR US $559.00
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 Audio Technica ATW 3110BDAT831CW Wireless Lavaliere Microphone System Body Pack US $399.00
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 Rode NT2 A Condenser Mic Studio Solution Package US $499.00
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 Samson Stage 5H Wireless Microphone US $30.00
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 Art Pro MPA II Pro MPA 2 Pro MPAll PROAUDIOSTAR US $269.00
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 Peavey PM 18S Black Condenser Podium Microphone US $95.99
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 822B630 UHF Dual Mini Earhook Headset Wireless Microphone System US $289.00
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 Samson Airline 77 Wireless Aerobics Headset Mic N6 FREE NEXT DAY AIR US $299.00
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 Samson Airline 77 Aerobics Wireless QE Headset System US $349.99
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Rode Microphones NT4 Dual-Element Stereo Microphone $529 The RØDE NT4 Dual-Element Stereo Microphone is a small-diaphragm condenser microphone specifically designed for stereo recording. It features dual heads in a 90° XY configurationgreat for acoustic guitar, live concerts, and when mono-compatibility is an issue. Its compact size and design allows for effective and subtle positioning which is crucial when close miking. The NT4 is supplied with a custom case, stereo breakout cable, stand mount, and windscreen.Requires phantom power. |
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Rode Microphones Nt4 Dual-Element Stereo Microphone $529 The RDE NT4 Dual-Element Stereo Microphone is a small-diaphragm condenser microphone specifically designed for stereo recording. It features dual heads in a 90 XY configurationgreat for acoustic guitar, live concerts, and when mono-compatibility is an issue. Its compact size and design allows for effective and subtle positioning which is crucial when close miking. The NT4 is supplied with a custom case, stereo breakout cable, stand mount, and windscreen.Requires phantom power.XY-stereo coincident-pair elementsCompact sizeHigh SPL/low noiseGreat sound |
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Audio-Technica Atm250de Dual-Element Instrument Microphone $299 The Artist Series ATM250DE dual-element instrument microphone features cardioid condenser and hypercardioid dynamic capsules combined in a single housing. Audio-Technica's innovative use of two polar patterns is ideal for kick drum: the hypercardioid dynamic element focuses tightly on the aggressive attack of the beater, while the condenser captures the round tonalities of the shell. The elements are positioned in a perfect phase relationship, something practically impossible to achieve with two separate microphones. Not just for kick drum, Metallica is now using the ATM250DE in concert, on all guitar cabs, and it's also stellar on bass amps. Includes a professional isolation clamp to provide secure mounting, versatile positioning and effective dampening of unwanted mechanical noise.Audio-Technica's proven dual-element design features two elements (condenser and dynamic) enclosed in a single housing Neodymium dynamic element provides punch and attack, while the condenser element captures the full audio spectrum Elements are positioned in a perfect phase relationship, something practically unachievable with two separate microphones Perfect for kick drum, guitar amps and instrument use Integral 80 Hz HPF switch and 10 dB pad (condenser element) Versatile mounting options and effective dampening of mechanical noise thanks to included AT8471 isolation clamp Corrosion-resistant contacts from gold-plated XLRM-type connector Rugged, all-metal design and construction for years of trouble-free use |
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Shure Mx396c Microflex Multi-Element Boundary Microphone Dual $349.99 The MX396 Tri-Element Boundary Microphone features three cardioid elements that are adjustable to 120-120-120 degrees, a mute output, and an LED input. The cable can exit from either the back or bottom exit of the unit. The Shure MX396 Tri-Element microphone is a unique and versatile tool for conference room installations, providing full coverage of large tables using fewer microphones, and a low profile design. Clean and simple in appearance, the MX396 boundary mic is ideal for use in boardrooms and other installations where aesthetics are important. The Shure multi-element plate microphone is also available in a dual element configuration.End of table (300 degrees ), center of table (360 degrees ), or cross table (bidirectional) coverage patternsLow profile, aesthetic designWide dynamic range and smooth frequency responseIndividual control of each elementBi-color status indicatorProgrammable mute switchLogic input/output for remote LED and mute controlRadio Frequency filtering with CommShield technologyConfigurable mute switch with logic output |
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Used Audio-Technica Ae2500 Dual-Element Kick Drum Microphone $499.59 The Audio-Technica AE2500 kick drum mic has a dynamic element that delivers the aggressive attack of the beater while the condenser captures the round tonalities of the shell. The dual elements are positioned in a perfect phase relationship, which is practically unachievable with 2 separate microphones. Robust design provides enduring dependability on the road. The AE2500 microphone features an integral 80Hz HPF switch and a 10dB pad. Includes the Audio-Technica AT8471 isolation clamp.Revolutionary dual-element design Condenser and dynamic elements are contained in a single housing Elements are positioned in a perfect phase relationship Robust design provides enduring dependability on the road Integral 80Hz HPF switch and a 10dB pad Includes the AT8471 isolation clamp |
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Audio-Technica Ae2500 Dual-Element Kick Drum Microphone $549 The Audio-Technica AE2500 kick drum mic has a dynamic element that delivers the aggressive attack of the beater while the condenser captures the round tonalities of the shell. The dual elements are positioned in a perfect phase relationship, which is practically unachievable with 2 separate microphones. Robust design provides enduring dependability on the road. The AE2500 microphone features an integral 80Hz HPF switch and a 10dB pad. Includes the Audio-Technica AT8471 isolation clamp.Revolutionary dual-element design Condenser and dynamic elements are contained in a single housing Elements are positioned in a perfect phase relationship Robust design provides enduring dependability on the road Integral 80Hz HPF switch and a 10dB pad Includes the AT8471 isolation clamp |
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Shure Mx396c Microflex Multi-Element Boundary Microphone Tri $419.99 The MX396 Tri-Element Boundary Microphone features three cardioid elements that are adjustable to 120-120-120 degrees, a mute output, and an LED input. The cable can exit from either the back or bottom exit of the unit. The Shure MX396 Tri-Element microphone is a unique and versatile tool for conference room installations, providing full coverage of large tables using fewer microphones, and a low profile design. Clean and simple in appearance, the MX396 boundary mic is ideal for use in boardrooms and other installations where aesthetics are important. The Shure multi-element plate microphone is also available in a dual element configuration.End of table (300 degrees ), center of table (360 degrees ), or cross table (bidirectional) coverage patternsLow profile, aesthetic designWide dynamic range and smooth frequency responseIndividual control of each elementBi-color status indicatorProgrammable mute switchLogic input/output for remote LED and mute controlRadio Frequency filtering with CommShield technologyConfigurable mute switch with logic output |
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Used Shure Mx396c Microflex Multi-Element Boundary Microphone Tri $382.19 The MX396 Tri-Element Boundary Microphone features three cardioid elements that are adjustable to 120-120-120 degrees, a mute output, and an LED input. The cable can exit from either the back or bottom exit of the unit. The Shure MX396 Tri-Element microphone is a unique and versatile tool for conference room installations, providing full coverage of large tables using fewer microphones, and a low profile design. Clean and simple in appearance, the MX396 boundary mic is ideal for use in boardrooms and other installations where aesthetics are important. The Shure multi-element plate microphone is also available in a dual element configuration.End of table (300 degrees ), center of table (360 degrees ), or cross table (bidirectional) coverage patternsLow profile, aesthetic designWide dynamic range and smooth frequency responseIndividual control of each elementBi-color status indicatorProgrammable mute switchLogic input/output for remote LED and mute controlRadio Frequency filtering with CommShield technologyConfigurable mute switch with logic output |
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Heil Sound PR 28 Dynamic Microphone $149 The PR 28 is Heil's premier drum microphone. Its tight cardioid pattern, wide frequency response, and stellar rear rejection make it ideal for toms, snares, bongos, and many other applications. The Heil drum microphone's unique dual suspension system between the actual dynamic element and the grille and body reduce unwanted vibrations. |
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Shure Ulxp24d/87 Dual Handheld Wireless Microphone System M1 $1939 The Shure ULXP24D/87 Dual Handheld Wireless Microphone System includes two ULXP4 Diversity Receivers, and two ULX2 Handheld Transmitters fitted with SM87A Mic capsules. Shure ULX Standard UHF systems represent a breakthrough in performance and price for both working musicians and professional sound installers. ULX Professional systems offer more advanced features and controls, including lockable settings and group scan function. Over 1400 selectable, pre-programmed frequencies are available, and Automatic Frequency Selection provides a straight shot to a clear channel. ULXP4 Wireless Diversity ReceiverThe expanded feature set of the ULXP4 wireless receiver, with advanced settings and controls including lockable settings and group scan, offers a direct path to full, clear audio signals. The ULXP4 offers an exceptional value in both performance and price, for both working musicians and sound installers.ULX2 Handheld TransmitterThe ULX2 Handheld Transmitter features 3-segment battery fuel gauge, frequency and power settings, and control lockout. A backlit LCD shows group and channel.SM87A Vocal MicrophoneThe Shure SM87A microphone is a professional-quality, handheld condenser microphone for use in sound reinforcement, broadcasting, and studio recording installations. Its supercardioid polar pattern provides greater rejection of unwanted sound sources, making it ideal for miking individual instruments in a multi-microphone setting or for miking single sources in a reverberant or noisy environment. An integral three-stage wind and pop filter protects against wind and breath noise. Its built-in shock mount reduces stand and handling noise.ULXP4 Wireless Diversity ReceiverAutomatic Frequency Selection with group scan functionOver 1400 selectable frequenciesPredictive Diversity5-segment transmitted audio signal strength meter5-segment RF meter3-segment transmitter battery fuel gaugeAdvanced multi-function LCD displays group and channelMic/Line switchRemotable 1/2-wave antennaFrequency and volume lockoutXLR and 1/4-inch outputRugged metal chassis1/2 rack designULX2 Handheld Transmitter8-9 Hour Battery LifePower: On/Off Switch, BatteryLED-Green When ON, Red When Battery LowThree-segment Battery Power IconPEAK Icon-Appears When Audio Signal OverloadsGroup/Channel DisplaysSET Button for Saving SettingsAdjustable Audio Gain ControlInput Attenuation Switch-Select 0dB for Voice/Low Output; 20dB for High Output4-pin Mini ConnectorBattery Cover Unscrews to Expose Battery and Gain Control9V Battery IncludedSM87A Vocal MicrophoneHighly directional supercardioid pickup patternControlled low-frequency roll-offVery low RF and magnetic hum susceptibilityMinimally affected by varying load impedanceBuilt-in wind and pop filterTransducer element shock mountedRugged construction for outstanding reliabilityField-usable over a wide range of temperature and humidity conditionsAccepts a wide variety of phantom power sources, including DIN 45 596 voltages of 11 and 52 Vdc |
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Shure Ulxp24d/87 Dual Handheld Wireless Microphone System J1 $1939 The Shure ULXP24D/87 Dual Handheld Wireless Microphone System includes two ULXP4 Diversity Receivers, and two ULX2 Handheld Transmitters fitted with SM87A Mic capsules. Shure ULX Standard UHF systems represent a breakthrough in performance and price for both working musicians and professional sound installers. ULX Professional systems offer more advanced features and controls, including lockable settings and group scan function. Over 1400 selectable, pre-programmed frequencies are available, and Automatic Frequency Selection provides a straight shot to a clear channel. ULXP4 Wireless Diversity ReceiverThe expanded feature set of the ULXP4 wireless receiver, with advanced settings and controls including lockable settings and group scan, offers a direct path to full, clear audio signals. The ULXP4 offers an exceptional value in both performance and price, for both working musicians and sound installers.ULX2 Handheld TransmitterThe ULX2 Handheld Transmitter features 3-segment battery fuel gauge, frequency and power settings, and control lockout. A backlit LCD shows group and channel.SM87A Vocal MicrophoneThe Shure SM87A microphone is a professional-quality, handheld condenser microphone for use in sound reinforcement, broadcasting, and studio recording installations. Its supercardioid polar pattern provides greater rejection of unwanted sound sources, making it ideal for miking individual instruments in a multi-microphone setting or for miking single sources in a reverberant or noisy environment. An integral three-stage wind and pop filter protects against wind and breath noise. Its built-in shock mount reduces stand and handling noise.ULXP4 Wireless Diversity ReceiverAutomatic Frequency Selection with group scan functionOver 1400 selectable frequenciesPredictive Diversity5-segment transmitted audio signal strength meter5-segment RF meter3-segment transmitter battery fuel gaugeAdvanced multi-function LCD displays group and channelMic/Line switchRemotable 1/2-wave antennaFrequency and volume lockoutXLR and 1/4-inch outputRugged metal chassis1/2 rack designULX2 Handheld Transmitter8-9 Hour Battery LifePower: On/Off Switch, BatteryLED-Green When ON, Red When Battery LowThree-segment Battery Power IconPEAK Icon-Appears When Audio Signal OverloadsGroup/Channel DisplaysSET Button for Saving SettingsAdjustable Audio Gain ControlInput Attenuation Switch-Select 0dB for Voice/Low Output; 20dB for High Output4-pin Mini ConnectorBattery Cover Unscrews to Expose Battery and Gain Control9V Battery IncludedSM87A Vocal MicrophoneHighly directional supercardioid pickup patternControlled low-frequency roll-offVery low RF and magnetic hum susceptibilityMinimally affected by varying load impedanceBuilt-in wind and pop filterTransducer element shock mountedRugged construction for outstanding reliabilityField-usable over a wide range of temperature and humidity conditionsAccepts a wide variety of phantom power sources, including DIN 45 596 voltages of 11 and 52 Vdc |
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Audio-Technica At4047 Condenser Microphone $699 The Audio-Technics AT4047 Condenser Microphone is designed for professional recording and critical applications in broadcast and live sound. Transformer-coupled output and a specially tuned element provide sonic characteristics reminiscent of early FET studio mic designs. The AT4047 mic has exceptionally low self-noise, wide dynamic range and high SPL capability. It sports a vintage silver-matte finish on the microphone and shock mount. Audio-Technica includes a protective case and AT8449/SV shock mount with the AT4047 microphone. Requires phantom power.Gold-plated, specially contoured and aged, dual-diaphragms Switchable 80 Hz hi-pass filter and 10 dB pad Includes AT8449/SV shockmount |
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Heil Sound Pr 28 Dynamic Microphone $149 The PR 28 is Heil's premier drum microphone. Its tight cardioid pattern, wide frequency response, and stellar rear rejection make it ideal for toms, snares, bongos, and many other applications. The Heil drum microphone's unique dual suspension system between the actual dynamic element and the grille and body reduce unwanted vibrations.Dual suspension system between dynamic element and the grillePattern: CardioidFrequency response: 55Hz - 18kHz (3dB rise @3500Hz)Rear rejection: -35dB @ 180 off axisSPL: handles +148dB |
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Ddrum Drt Dual Element Snare Trigger $79 The ddrum DRT Dual Element Kick Trigger features dual redundant trigger technology that lets you switch between 2 different elements in the same trigger housing. This fail-safe back-up triggering system ensures that your show will run smooth. |
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Ddrum Drt 5-Piece Dual Element Trigger Pack $299 The ddrum DRT Dual Element Trigger Pack includes five ddrum triggers with dual redundant trigger technology that lets you switch between 2 different elements in the same trigger housing. This fail-safe back-up triggering system ensures that your show will run smooth.Five-pack of switchable dual element triggers with Secure XLR connector Wide dynamic range Rugged metal housing Precision response Easily replaceable transducer Works with popular drum modules Dual triggers with toggle switch to select alternate transducer without having to switch XLR cables |
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Ddrum Drt Dual Element Kick Trigger $79 The ddrum DRT Dual Element Kick Trigger features dual redundant trigger technology that lets you switch between 2 different elements in the same trigger housing. This fail-safe back-up triggering system ensures that your show will run smooth.Secure XLR connector Wide dynamic range Rugged metal housing Precision response Easily replaceable transducer Works with popular drum modules Dual triggers with toggle switch to select alternate transducer without having to switch XLR cables |
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Blue Microphones Snowball USB Microphone (Gloss Black) List Price: $99.00 Sale Price: Too low to display Used From: $75.00  |
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The Snowball is a direct plug n' play mic that connects to either a Mac or PC - no additional software is needed. With its dual capsule design and unique three-pattern switch (cardioid, cardioid with -10dB pad and omni), the Snowball can handle everything from soft vocals to the loudest garage band - and it's ideal for podcasting. |
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Blue Microphones Snowball USB Microphone (Brushed Aluminum) List Price: $99.00 Sale Price: Too low to display Used From: $57.00 |
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The Snowball is a direct plug n' play mic that connects to either a Mac or PC - no additional software is needed. With its dual capsule design and unique three-pattern switch (cardioid, cardioid with -10dB pad and omni), the Snowball can handle everything from soft vocals to the loudest garage band - and it's ideal for podcasting. |
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CAD Trion7000 Dual-Element Ribbon Microphone List Price: $299.00 Sale Price: Too low to display |
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Thick and rich, the dual ribbon "rounds out" guitar stacks, brass, and woodwinds. A narrow strip of ultra thin aluminum suspended in a magnetic field oscillates symbiotically with your sound source. Electrical current is the result... |
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CAD e70 Modular Dual Element Condenser Microphone List Price: $349.00 Sale Price: $109.00 |
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Packaged in a small, rugged metal housing, the equitek e70 condenser microphone provides transparent, accurate acoustic capture. The low mass 1/2 in. gold sputtered diaphragm makes the e70 the preferred choice for high frequency sources rich in transients such as cymbal, hi-hat, strings, acoustic guitar, woodwinds and piano... |
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Griffin Technology BlueTrip AUX for iPhone and Smartphones List Price: $99.99 Sale Price: $49.99 |
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Griffin's smallest in-car solution yet lets you play music and talk handsfree with your iPhone or any Bluetooth-enabled smartphone. Slip the low-profile Bluetooth receiver into your vehicle's accessory power outlet, then connect the included auxiliary audio cable to your car stereo's AUX-In jack... |
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Sony XAMC10 External Mic for BT (Black) List Price: $29.95 Sale Price: $29.95 Used From: $23.43 |
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The Sony XAMC10 is an external microphone that can be connected to a Sony headunit with built-in Bluetooth that features a rear microphone input. The XAMC10 external microphone provides better quality in noisy environments than the built in microphone found on the front-panel of your compatible Sony Bluetooth headunit. |
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Audio-Technica ATM250DE Dual-Element Instrument Microphone List Price: $549.00 Sale Price: $299.00 Used From: $220.00 |
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The Artist Series ATM250DE dual-element instrument microphone features cardioid condenser and hypercardioid dynamic capsules combined in a single housing. Audio-Technica's innovative use of two polar patterns is ideal for kick drum: the hypercardioid dynamic element focuses tightly on the aggressive attack of the beater, while the condenser captures the round tonalities of the shell... |
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CAD Trion 7000 Dual-Element Ribbon Microphone Bundle with 20-Foot XLR Cable, Windscreen, and Polishing Cloth List Price: $319.00 Sale Price: $199.99 |
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Bundle includes CAD Trion 7000 Dual-Element Ribbon Microphone, 20-Foot XLR Cable, Windscreen, and Polishing Cloth.Thick and rich, the dual ribbon "rounds out" guitar stacks, brass, and woodwinds. A narrow strip of ultra thin aluminum suspended in a magnetic field oscillates symbiotically with your sound source... |
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Sony MEXBT2700 CD Receiver with Bluetooth Hands-Free with Integrated Microphone (Black) List Price: $159.95 Sale Price: $99.99 |
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Welcome to a hands-free nation. The Sony MEX-BT2700 CD Receiver MP3/WMA Player features Bluetooth wireless technology for simple hands-free phone calls and audio streaming (with a Bluetooth compatible phone)... |
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Koss iSpark iPhone Stereophone (Black) List Price: $22.99 Sale Price: $19.99 Used From: $11.49 |
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The Koss iSpark iPhone stereophone was specifically designed for the Apple iPhone. Unique portable earbud stereophone with a specialty ear cushion material which forms slowly in the ear canal providing a custom fit and maximum isolation... |
History of the Loudspeakers
A loudspeaker, speaker, or speaker system is an electromechanical transducer that converts an electrical signal. The term loudspeaker can refer to an individual device or driver, and a complete system consisting of an enclosure corporating one or more drivers and additional electronics.
Loudspeakers are the most variable elements in any audio system, and are responsible for marked audible differences between otherwise identical sound systems. Loudspeaker performance or accuracy in reproducing a signal without adding distortion is significantly poorer than that of other audio equipments.
Some important men who made history
Ernst W. Siemens was the first to describe the dynamic or moving coil transducer, with a circular coil of wire in a magnetic field and supported so that it could move axially. He filed his U. S. patent application for a Magneto electric Apparatus for obtaining the mechanical movement of an electrical coil by electrical currents transmitted through it was granted patent No.149797 on April 14, 1874.
Oliver Lodge filed for British patent No.9712 on Apr. 27, 1898, for an improved loudspeaker with nonmagnetic spacers to keep the air gap between the inner and outer poles of a moving coil transducer. This was the same year he applied for a patent on his famous radio tuner.
Thomas Edison was issued a British patent during 1881, for a system using compressed air as an amplifying mechanism for his early cylinder phonographs, but he ultimately settled for the familiar metal horn driven by a membrane attached to the stylus.
Harold Arnold around 1925 began program at Bell Labs to improve phonographic sound recording. The first priority was the electronic amplifier using the new vacuum tube, second was the microphone, and third was the loudspeaker that would improve the balanced armature units developed for public address.
Bell Laboratories in 1931 developed the two way loudspeakers, called divided range for the demonstration by H. A. Frederick of vertically cut records. The high frequencies were replaced by a small horn with a frequency response of 3000 to 13,000 hz, and the low frequencies by a 12 inch dynamic cone direct radiator unit with a frequency response within 5db from 50 to 10,000 hz.
How the loudspeakers used to work
The first loudspeakers used electromagnets because large, powerful permanent magnets were not available at reasonable cost.
The coil of an electromagnet, called a field coil, was energized by current through a second pair of connections to the driver. This winding usually served a dual role, acting also as a choke coil filtering the power supply of the amplifier to which the loudspeaker was connected.
AC ripple in the current was attenuated by the action of passing through the choke coil. However, AC line frequencies tended to modulate the audio signal being sent to the voice coil and added to the audible hum of a powered up sound reproduction device.
The quality of loudspeaker systems until the 1950s was, by modern standards, poor. Continuous developments in enclosure design and materials have led to the significant audible improvements. The most notable improvements in modern speakers are improvements in cone materials, the introduction of higher temperature adhesives, improved permanent magnet materials, improved measurement techniques, computer aided design and finite element analysis.
About the Author
Victor Epand is an expert consultant for music gear, speakers, and microphones. You can find the best marketplace for music gear, speakers, and microphones at these 3 sites: music gear, music equipment, speakers, loud speakers, and laser microphones, parabolic microphone.