Please help - Impotence problem



Okay, forget my impotence problem, I have a more important issue with an impedance problem. Or do I? The latest incarnation of my system sounds truly fantastic and live but only at very high volume. I�ve read somewhere in the past that this may be a sign there�s an impedance mismatch somewhere in the system.

Can someone tell me how to find such a mismatch? I have two Counterpoint NP220 stereo amps bi-amped to a pair of Waveform Mach 13�s with an external crossover. My preamp is a Counterpoint SA-11. I�m assuming the Counterpoints work together so what could the problem be? Currently I�m just running digital (Sony SCD-777es) so I�m not concerned (yet) with my analogue rig.

(the two Counterpoint amps were SA-220's fully upgraded by Elliot with 'low sensitivity' instead of 'high sensitivity' but this is supposed to be the way to go if your preamp can handle it and mike elliot specifically recommends 'low sensitivity' if using with the SA-11 preamp.)

Overall instruments seem unbalanced with too much treble in the forefront, even when adjusting the crossover.

Could it be that the system is simply too bright and that's why i'm feeling the need to turn the volume control up so i can enjoy the midrange? Perhaps the problem is more with cables or a need for power conditioning? oh, god, i'm getting that feeling again. little help?!

Maybe someone out there has a good link for me to read up on this if the answer is too complex.

Thanks in advance.
kublakhan

Showing 1 response by albertporter

Kubla. Which set of outputs are you using from the Counterpoint 11?

In spite of what you may have been told, the buffered outputs sound much worse. Even in very long runs (up to 40 feet) with those amps.

Use the direct out, I will try to remember which set of input jacks are the best sounding ones. They are all routed differently and one was clearly better.

Have you replaced the outboard jumpers with high quality wire and better connectors? Or if you're handy, solder across them internally with a piece of OFC copper wire.

If you have not replaced the output tubes with NOS 5692 tubes, you should. The Russian tubes typically found in these have terrible high frequencies.

Also, this uses a 6080 regulator. If it gets weak it severely damages the sound, long before it fails. NOS Mil grade may be purchased for about $10.00. If yours has not been replaced, I would do so.

You did not mention isolation. That particular preamp really responds well to Mod Squad Soft Shoes and Vibrapods.

You are welcome to call me if you need help.