brnt99 Posted October 18, 2003 Share Posted October 18, 2003 I have a pair of Cornwall 11's which I like a lot.I also have a number of differant vintage amps/preamps/integrated amps that I have tried out.I am presently useing a Marantz Esotec PM4.It sounds good, dispite peoples claims that it shouldnt.I also have a Pilot 240 integrated amp.It sounds great with 3 or 4 other speakers I have, but with the Cornwalls it sounds terrible. Not just poor or average but harsh,naked, distorted.Can someone explain to me why this amp which has a fairly good reputation and sounds fantastic with other speakers sounds terrible with my Cornwalls. Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 18, 2003 Share Posted October 18, 2003 A first guess is the impedance curve of the Cornwalls. It rises to 60 ohms, or so in the midrange. Quote Link to comment Share on other sites More sharing options...
djk Posted October 18, 2003 Share Posted October 18, 2003 Small pentode amps cheat on transformer iron. Ported speakers with big magnets have impedance peaks in the bass that will cause the inductance in the transformer to saturate. Distortion. Wire a 15 ohm 25W resistor in parallel with the speaker and hook to the amplifier 4 ohm tap. This should also take care of the midrange problem too. Quote Link to comment Share on other sites More sharing options...
brnt99 Posted October 18, 2003 Author Share Posted October 18, 2003 Thanks for the info. I phoned a few electronic parts suppliers in town and they dont have them--in stock anyway. I will try to find one and let you know if it works. Brent Quote Link to comment Share on other sites More sharing options...
djk Posted October 19, 2003 Share Posted October 19, 2003 $0.60 each from Madisound http://madisound.com/capcoil.html Quote Link to comment Share on other sites More sharing options...
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