Field Coil Speaker
Field Coil Speaker
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 LP PHONO CD LCD DVD DEGAUSS COIL POWER DEMAG 60 HZ HERTZ COIL TOOL  US $49.99
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 Urushi Capacitor 015uF 1000V by MrTeramoto Feastrex US $56.00
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 Tube amp 12 field coil speaker 1100 ohm field 4 ohm speaker US $19.99
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 Field Coil Speaker 12 US $15.00
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 RCA 13 wooferspairfield coil1938pair US $990.00
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 Beautiful 1929 10 Field Coil Speaker in Fancy Lyre Grill Walnut Cabinet Works US $51.00
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 RARE RCA MI 4411 FIELD COIL 6 SPEAKER US $2,250.00
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 1 PAIR OF ROLA 12 FIELD COIL SPEAKERS US $50.00
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 LAMBDA 0 120V STEREO FIELD COIL SPEAKER DC POWER SUPPLY US $349.00 |
 Vtg Magnavox Turntable Stereo Record Player 12 Field Coil Speaker US $71.99
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 Audels Radiomans Guide {Vintage Radio Manual} on CD US $9.99
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 ◄█ 1941 Jensen A 12 Speaker Theater Tube Amplifier █►Radioorphanage NR US $31.00
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 BIO RAD 160 16 0 160V DC POWER SUPPLY 4 TUBE AUDIO FIELD COIL SPEAKER US $289.00 |
 VINTAGE ROLA KIZA SPEAKER FIELD COIL CIRCA 1930 ANTIQUE US $94.50
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 VINTAGE JENSEN A 12 FIELD COIL SPEAKER CONCERT SERIES US $175.50
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 15 Field Coil Speaker US $500.00
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 Jensen Field Coil Speaker F15ll US $495.00
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 1929 Sonora B 31 Moving Coil Speaker Dynamic Reproducer US $149.99
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 Magnavox Illustravox Sr Projector Phonograph Tube Amp Field Coil Speaker US $89.99
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 Feastrex FINEMET Standard Transformers for ES9018 DAC US $870.00
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 Feastrex FINEMET Premium Transformer Buffalo ES9018 DAC US $1,030.00
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 Feastrex FINEMET Premium Transformers for AK4399 DAC US $1,030.00
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 Feastrex FINEMET Choke Input 100mH 1A for DAC upgrade US $220.00
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 Urushi Capacitor 047uF 1000V by MrTeramoto Feastrex US $60.00
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 Urushi Capacitor 1uF 1000V by MrTeramoto Feastrex US $63.00
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 Rola by Jensen Vintage Field Coil Theatre Speaker Western Electric licensed US $195.00
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 Feastrex FINEMET Prm 10VA Power Transformer DAC upgrade US $360.00
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 Feastrex FINEMET Std 10VA Power Transformer DAC upgrade US $270.00
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 Feastrex Premium FINEMET Choke 10H 200mA Tube Amp US $410.00
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 Feastrex Standard FINEMET Choke 10H 200mA Tube Amp US $300.00
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 RCA MI 1432 A Field Coil Speaker Part Western Electric lic 1444 1443 1428 1428b US $450.00
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 Matched pair field coil speaker 12’’ Klangfilm project US $3,999.00
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 Dynaco VTA M 125 125 watt tube amplifier KIT US $829.00
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 1956 Jensen Field Coil F15LL Leslie Speaker Original Working No Issues US $475.00
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 Midwest Tube Receiver Copper Bezel 200 300 Band Scale US $99.00
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 1956 Wurlitzer 7020 MONO Block 6L6 tube amp orig magnavox field coil speaker US $549.95
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 NEWIB DC POWER SUPPLY TUBE AUDIO AMP FIELD COIL SPEAKER US $389.00 |
 Fullrange 8 20cm AlNico ALU DEW Speaker Telefunken US $129.00
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 0 120 DC POWER SUPPLY TUBE AUDIO AMP FIELD COIL SPEAKER US $249.00 |
 Atelier Rullit field coil tweeters RE D208 16 US $3,000.00
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 Pair 10 Fullrange AlNiCo PM39 Phenolic Spider Speaker US $499.00
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 Jensen 12 Vintage Speaker FieldCoil Maganavox Speaker Tube Wurlitzer Amplififier US $600.00
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 Bell Howell C12 Field Coil Speaker Classic US $25.00
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 RCA MI 9443 Field Coil Driver Speaker Very RARE Western Electric NO RESERVE US $144.50
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 2 ONE VICTOR RCA TYPE 245 45 TRIODE VINTAGE TUBE AMP AMPLIFIER WORKING US $255.00
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 Pair of Field coil speakers Heavy US $60.00
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 1 ONE VICTOR RCA TYPE 245 45 VINTAGE TUBE AMP AMPLIFIER TESTED WORKING US $255.00
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 ANTIQUE ATWATER KENT SPEAKER TYPE F 6 FIELD COIL US $94.50
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 MOTIOGRAPH TUNGAR POWER SUPPLY For WE555 597 WE49 WE Preamp And RCA Amplifier US $868.00
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 Exclusive TAD 2402 Speaker Made in Japan US $15,800.00
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 pair of vintage FISHER speakers—W508 heavy Alnico magnet 12 woofers—great cond US $69.95
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 VINTAGE HAMMOND JENSEN Type LR 1D Field Coil Speaker Amplifier US $21.50
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 2 JENSEN F12N FIELD COIL SPEAKERS US $75.00
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 Sachsenwerk Fullrange 8 20cm Fieldcoil Speaker GR3831 Phenolic Spider US $149.00
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 Pair of Jensen F 12 Field Coil full range Speakers US $325.00
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 PAIR 1930S VINTAGE JENSEN WESTERN ELECTRICFIEDL COIL SPEAKER US $2,325.00
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 MAJESTIC FIELD COIL SPEAKER 73 4 NEEDS RE CONE US $32.75
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 majestic model g 2 super dynamic 8 and 3 4 inch field coil speaker US $30.00
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 Klangfilm fullrange 8 20cm AlNico Speaker VAC Berlin 6 Ruflsp22c US $129.00
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 Vintage Jensen A 12 Concert field coil speaker US $29.99
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 Jensen F15ll field coil speaker US $250.00
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 Graetz Fieldcoil Fullrange 8 20cm Speaker BV8070 US $139.00
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 Siemens Klangfilm fullrange AlNico Speaker DEW 6 Ruflsp13f US $259.00
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 2x TELEFUNKEN Klangfilm BIG power transformers AD1 RE604 EL12 US $499.00
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 Vintage NOS Jenson speaker output transformer F12Q Bell Howell Field Coi US $588.00
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 PAIR 1940S VINTAGE JENSEN RS SERIES 10 FIELD COIL FULL RANGE SPEAKER US $75.00
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 Pair of Vintage RCA 10 field coil speakers US $199.99
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 RCA matching transformer MI 9472 A MI9472A for WE555 systems field coil speakers US $20.00
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 SABA Fullrange Big AlNico Speaker Permadyn 25 US $129.00
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 VERY RARE FIELD COIL SPEAKER 8´ PHILIPS § LEATHER SURROUND § COLLECTOR US $45.00
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Why Not Know About Woofer Designing
Woofer is commonly known for its loudspeaker driver, designed to produce low frequency sounds. It can produce sounds ranging from around 40 hertz up to about a kilohertz or even higher. The name is derived from a dog bark, woof in contrast with tweeter. It is a name given to the speakers designed to reproduce high frequency sounds.
The most common design of a woofer is the electrodynamic driver. These use a cone, driven by a voice coil surrounded by a magnetic field. The combination of both the voice coil and the magnet forms a linear electric motor.
And when current flows through the voice coil, the coil then moves in relation to the frame, causing the coil to push or pull on the driver cone in a piston like way. The voice coil is attached to the back of the speaker cone with the help of an adhesive. The resulting motion of the cone creates sound waves as it moves in and out.
Designing and manufacturing a woofer is a challenging task. While designing a woofer you have to keep in mind the following points. Controlling the motion of the cone so the electrical signal to the woofer voice coil is dependably reproduced by the sound waves produced by the cone motion. Controlling the electrical impedance, which is the measure of opposition to a sinusoidal alternating current, is a challenging task. This is done so that the use of economic electronic amplifier can be made possible.
A good woofer design requires an effective conversion of low frequency amplifier signal to mechanical air movement with high commitment and maximum efficiency. It is complicated with the necessity of using a loudspeaker enclosure to couple the cone motion to the air.
The cone materials have its advantages and disadvantages. The three common high quality properties that designers look for in cones are light weight, stiffness and lack of coloration. Exotic materials like Kevlar and magnesium are light and stiff, but they can have ringing problems, depending on their fabrication and design. Materials like paper, which also includes the coated paper cones, and various other polymers will generally ring less than metal diaphragms, but can be heavier and not as stiff.
But, how the frame is design? The frame or the basket is the structure, which holds the cone, voice coil and the magnet in the power alignment. The voice coil gap is quite narrow, therefore it is important to prevent rubbing of the voice coil against the magnet structure in the gap and also to avoid extraneous motions.
There are two types of metal frames that are stamped and cast. Stamped baskets usually made of steel is a lower cost option. And the disadvantage of this frame is that the basket may bend if the speakers are on higher volumes. Cast baskets are more expensive but they are more rigid in all directions. Cast baskets have better damping, can have more intricate shapes, and are therefore usually the preferred for higher quality. Woofers designed for public address and instrument applications are similar to that of the structure of a home audio woofer.
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, woofer, and laser microphones, parabolic microphone.