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Why does my system now have shrill top end.

The equipment in my system (listed below) has not changed but I now find on both CD and Vinyl a high end shrillness to the sound (treble is very harsh) that has become very annoying, especially at high volume levels. I have no idea why this happened all of a sudden.

Endevour E-3
Pass 30.8
Pass XP 20
Esoteric K01x
Linn LP12 (Ortofon Black cartridge)
Linn Linto Phono Preamp
PS Audio P5 (Amp plugged in directly to wall)
JL Audio F112 v2 sub
OCOS Speaker cable (15 feet)
Pass XLR interconnect (Preamp to Amp)
Harmonic Technology Cable Magic Link (not current version). RCA termination

Any ideas?
proacman

Showing 2 responses by pbnaudio

pbnaudio's avatar
pbnaudio
1,614 posts
 
Do you leave your front end equipment on all the time or turn it off when not in use?  Warmup could be in play.  Is this for both LP and Digital playback?  

Second on Almargs comment about the OCOS Speaker Cable - 15 feet is a long cable - try a set of Canare 4S11 they are pretty inexpensive and a great value.

Best of Luck

Peter
pbnaudio's avatar
pbnaudio
1,614 posts
 
Excessive DC on the amplifiers output can easily be checked even without a multi meter, just turn on amplifier while observing the woofer cone if it moves out and does not return to neutral position after the initial turn on bump - the amplifier have excessive DC on the output. It of course can move in also in case the DC voltage is negative.

Opening up the amplifier and checking rail voltages and Bias current is on a whole other level, and best left to someone whom knows what they are doing.

My gut reaction to this is the very long, highly capacitive speaker wires are at least contributing to this.  As someone stated above - try lamp cord.  

Best of Luck
Peter  

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