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On 29 May 99, at 17:16, Per Lindgren wrote: > Jim Adney wrote: > > > On 28 May 99, at 10:01, Dana Hall wrote: > > > > > There are some manufacturers that make a Dual Voice coil speaker for > > > this application. I think the last one that I saw was at Radio Shack. > > > > I have not seen this kind of speaker, but it might exist. Such an > > arrangement would remove the possibility of a DC short from unit to > > unit, but all the AC drive from one would still be imposed on the > > other. I really don't know whether this would hurt anything, but it > > really doesn't sound like a good ide¥v! Jim, this is a good idea, you get stereo sound out of one speaker, but it > sounds as mono. This has been done in car stereo for ages, not so much in > regular speakers, mostly in subwoofers. There is no possibility of a short, > as the two coils are spearated from eachother. I would say that the dual > voice coil speaker setup is just as good as two separate speakers. I understand that this arrangement should give you a SUM of the 2 channels, but this is not the same as stereo. For low freqs, however there should be very little difference. I understand that there is no direct connection between the 2 coils, so there is no possibility of a DC connection, but since the 2 coils share a single magnetic circuit, any AC component imposed on one should show up in equal magnitude on the second. I think this should work exactly the same as a transformer. Keith, what do you make of this? Do these share a magnetic circuit? Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org