Active crossovers

If you use the Krell KBX, it has gain adjustment for each Highs and Lows, making the need for adjustable volume on the amp totally unnecessary. In fact, the less in the signal path the better, so unless I could bypass the amps volume control, I would prefer one without it.

Richard

OK, I posted this in the wrong thread, hehe! Hope I didn't cause too many blank stares!

I asked Albert the best way to bianp the VR's, here's his info:

Hello, again,
for facilitating active biamping of the speakers, does anything need to be
done to the speaker itself?

No. The internal circuitry divides the signal between the two amplifiers, so you don't need to change the speakers or buy an electronic crossover. Just connect the preamp or CD player to both amps with a "Y" connector and interconnects. Just make sure that both amps have a similar input sensitivity, so that they play at the same volume level. The output power has nothing to do with this, we use an 8 watt SET amp on the mid/tweeter unit and a 200 watt solid state amp on the woofers with complete integration! Albert

Let's be clear, these are LEVEL controls, NOT "gain" controls!!

We call them "gain" but 99% of the time they set the output level of a fixed gain circuit. To change the gain of a typical solid state circuit you need to change the feedback resistor. Few circuits (for good reasons) actually permit you to adjust the gain of a stage directly.

It is standard practice to build in "excess gain" so that you can set a level control midway - in fact the volume control only LOWERs the level down from maximum.

On power amps 99.9% of all level controls are right at the input of the amp, before any active circuitry. Again they only serve to lower the input level to the front end.

There are some exceptions, like the Crown Macro Techs which if I recall actually has a neat circuit that adjusts gain, not level, in order to *set the level* then sent on to the fixed gain remainder of the amp...

Again "gain" is not an accurate description of this control, although we all tend to use the term!

_-_-bear