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#1
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Loudspeaker design question
Has any manufacturer ever designed/built a loudspeaker that reversed the
functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Regards, rtt |
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#2
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Loudspeaker design question
On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins"
wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#3
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Loudspeaker design question
On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins"
wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#4
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Loudspeaker design question
On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins"
wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#5
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Loudspeaker design question
Great. Any examples or URL's to reference?
"Kalman Rubinson" wrote in message ... On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#6
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Loudspeaker design question
Great. Any examples or URL's to reference?
"Kalman Rubinson" wrote in message ... On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#7
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Loudspeaker design question
Great. Any examples or URL's to reference?
"Kalman Rubinson" wrote in message ... On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#8
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Loudspeaker design question
On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins"
wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Kal "Kalman Rubinson" wrote in message .. . On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#9
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Loudspeaker design question
On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins"
wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Kal "Kalman Rubinson" wrote in message .. . On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#10
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Loudspeaker design question
On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins"
wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Kal "Kalman Rubinson" wrote in message .. . On Wed, 26 May 2004 22:10:50 GMT, "Richard Tomkins" wrote: Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? Would add substantial moving mass which is usually unwanted. What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Most dome tweeters. Some have attempted this with larger drivers. Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? If you could control the drive in a coordinated way. How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Old hat. Kal |
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#11
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Loudspeaker design question
On 28 May 2004 01:26:41 GMT, YourNameFirst
wrote: Kalman Rubinson wrote: On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins" wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Din't Carver have some offering with the feedback thing going on at one time? Many powered subs today do but not all use the second VC. Wireless World published a DIY article for this. Kal |
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#12
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Loudspeaker design question
On 28 May 2004 01:26:41 GMT, YourNameFirst
wrote: Kalman Rubinson wrote: On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins" wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Din't Carver have some offering with the feedback thing going on at one time? Many powered subs today do but not all use the second VC. Wireless World published a DIY article for this. Kal |
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#13
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Loudspeaker design question
On 28 May 2004 01:26:41 GMT, YourNameFirst
wrote: Kalman Rubinson wrote: On Thu, 27 May 2004 02:23:28 GMT, "Richard Tomkins" wrote: Great. Any examples or URL's to reference? No. Have none off hand and no time for such research. Din't Carver have some offering with the feedback thing going on at one time? Many powered subs today do but not all use the second VC. Wireless World published a DIY article for this. Kal |
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#14
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Loudspeaker design question
"Richard Tomkins" wrote in message ws.com...
Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Regards, rtt Way back in the day there were speakers with conventional voice coils but that used a stationary electro-magnet instead of a permanent magnet. In order to energize that stationary coil it was also used as the filter inductor in the power supply. |
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#15
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Loudspeaker design question
"Richard Tomkins" wrote in message ws.com...
Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Regards, rtt Way back in the day there were speakers with conventional voice coils but that used a stationary electro-magnet instead of a permanent magnet. In order to energize that stationary coil it was also used as the filter inductor in the power supply. |
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#16
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Loudspeaker design question
"Richard Tomkins" wrote in message ws.com...
Has any manufacturer ever designed/built a loudspeaker that reversed the functions of the voicecoil and permanent magnet, such that the permanent magnet was attached to the speaker cone and the electromagnet was the stationary magnet? What about having the voicecoil on the outside rim of the speaker rather than on the inside? Has this ever been done? Instead of using a single voicecoil in the center, how about one on the edge and one in the middle? How about a dual voice coil, one being driven and the second providing feedback like a closed servo loop? Regards, rtt Way back in the day there were speakers with conventional voice coils but that used a stationary electro-magnet instead of a permanent magnet. In order to energize that stationary coil it was also used as the filter inductor in the power supply. |
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