wjm@whuxk.UUCP (MITCHELL) (01/04/84)
As mentioned in earlier articles posted to net.audio, the Hafler circuit can be used to enhance the depth of a stereo system by using a 3rd speaker to reproduce the out-of-phase information between channels. In general, the Hafler circuit IF PROPERLY CONNECTED (I know one character who burned out his power amp by connecting it up wrong) will do no harm to one's amplifier or speakers IF the amplifier has a common ground between channels and does NOT invert the phase on one channel. If the amp does NOT have a common ground connection, serious amplifier damage can result from the use of this circuit. This circuit should NOT be used with the Carver amp, or any other amp that inverts the phase of one channel. Bill Mitchell CSO Whippany, NJ (whuxk!wjm)\
jdd@allegra.UUCP (John DeTreville) (01/04/84)
Harmon-Kardon amps (with dual power supplies) are also know for not having a
common ground between channels. I once blew out a set of speakers learning
this.
Cheers,
John ("Live and Learn") DeTreville
Bell Labs, Murray Hill