Amp/Preamp Asylum

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Help! Something went wrong...

Posted by Jeff TOJ on March 17, 2012 at 13:07:39:
Went to turn on the system yesterday and fired up a CD. Treble is fine but bass is highly attenuated. As if there were tone controls and the bass was all the way down.

The system is an Ah! Njoe Tjoeb CDP, AES-AE3 DJH pre, AES Six Pac amps and Apogee Caliper speakers.

I substituted tubes in the CDP, pre, and the 12BZ7 on the amps. Nothing.

I switched out to another CDP. Checked cables. Even switched in small bookshelf speakers.

I can't find the source of the problem. But since it's in both channels, I'm suspecting the pre-amp. But what in a pre-amp would cause this problem?

Thoughts or suggestions would be much appreciated. Where did all the bass go? I'm stumped!