Bi-Amping without dual pre-amp outs

You are not cutting the line level feed in half. If the two power amps have equal input impedances, you are cutting the load impedance seen by the preamp in half. As long as the combined load impedance is still much higher than the preamp's output impedance, you should be ok.

If the input impedances of the two power amps are not the same, their combined total input impedance is the reciprocal of the sum of the reciprocals of the two input impedances.

Of course, your y-connectors and cabling should be of good quality, and should not have excessive capacitance (which would be a function of cable type and length). Excessive capacitance, especially if the preamp output impedance is highish, would roll off the highs. That is true of any line-level connection, but is of increased importance here because of the added cabling.

See the posts by the noted designer Steve McCormack in the following thread. He offers some excellent thoughts on biamping:

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1234896660

Regards,
-- Al

I'm pretty sure that most preamps with a second set of preouts are splitting internally for the second pair.

Dave

Sogood51 wrote: I'm pretty sure that most preamps with a second set of preouts are splitting internally for the second pair

They would have to, wouldn't they? Are you trying to say something about how the two sets of outputs are driven. Many (most?) are simply Y-connected internally but some preamps actually have separate drivers for each set.

Kal

Al,

WOW ! ! ! How insightful and encouraging. I'm using MIT 1 meter interconnects and I certainly don't have a shortage of high end frequency. This puts my mind at ease.
Thank you.

Al and Kal,

Thank you also.

Sincerely,

Drew

Kal

Just saying: Whats the difference, inside split or outside split?.....it's all good and well.

Dave

I agree, Dave, there is no real difference between splitting the signal internally or externally UNLESS there are additional output stages internally.

Kal

Once again,
Thankx to ALL!
Now I won't sweat the little stuff.

Sincerely,

drewmb1