On 17 Feb 2007 13:37:18 -0800, wrote:

I have a NAD C350 stereo integrated amp I use for stereo sources and
it sounds great. I have just bought the Denon 1907 receiever but still
want to run music through the stereo nad amp, and L + R movie channels
from the receiver to the same Left and Right front speakers.

OK, I think I understand this - you reckon that the NAD will sound
better, and either your existing front speakers are very good or you
can't find the space/money for a second pair. Sounds logical - I also
use a different stereo amp for music from my surround receiver, but I
have a second pair of front speakers.

Scenario ONE

Now, I could use the front L + R pre-outs of the reciever to feed the
C350 and permenantly have my speakers connected to the C350 and
disable the front L + R outputs of the receiver...

You could, but that would give you problems balancing the front L+R
with the rest of the surround system for surround use. Too much hassle
for my liking.

Scenario TWO

Just run one set of left and right cables from BOTH the Stereo amp AND
the receiver to the SAME terminals on the speakers, so I would get
sound from either amp at any time. (But would this cause damage with
both amps technically working 'against' each other?? They both
wouldn't be switch on at the same time, but still.....)

I'm no engineer, but I suspect that this might not cause damage.
Nonetheless, I wouldn't want to run the risk if it was my kit.

And then there'll be the time when you forget to turn one off when
using the other.

Scenario THREE

Run L + R wires from BOTH amps to the speakers as in scenario two, but
connected to SEPARATE CROSSOVER TERMINALS on each speaker, (the
terminals that would usually be used for bi-wiring). (But would this
cause one amp to sound 'tinny' and one to sound 'bassy'??)

If the crossover remains connected to both sets of terminals, I think
that this would be effectively the same as no. 2 above.

Scenario FOUR

Have the C350 permanantly connected to the receiver's front L + R pre-
outs, then connected to one crossover on the speakers AND have the L +
R outputs of the receiver enabled, connected to the other crosspoint
terminals on the same speakers. (would this be classed as as an
effective way of bi-wiring, or would this setup sound odd??)

Don't think I understand this one.

I think that there's a fifth option, and it's the one I'd try, though
it does involve spending a little more money. There are switchboxes
around that are designed to allow the switching of two pairs of
speakers from one amp (example at
http://www.audiovisualonline.co.uk/d.../display.html).
I don't see why you couldn't reverse this - ie, connect both amps to
the speaker terminals and the speakers to the amp terminals. NB: the
example I've offered is for a series switch. I'm not certain that it's
not the parallel version that you'd actually want.

Peter.