Some speakers like my NHT 2.5i's have bi-amp capability. No electronic
(pre-amp level) x-over needed. There are 2 sets of posts at back of each
cabinet. I have (2) stereo 100w/ch amplifiers separately connected, 1 for
woofer and 1 for mid/tweeter. These are fed from pre-amp which conveniently
has 2 outputs. As for level control, the woofer amplifier has gain control
at back of unit. If you really do not have two pre-outs you may have to go
with a RCA jack Y-connector. EBAY has various ModSquad, Audioquest and
StraightWire Y's for bid right now.

Results: definitely more presence in my large-ish living room. More bass
with 100wpc dedicated to that driver. I suppose a 200wpc amplifier would've
done same but I like the building block method. Easier on my checkbook.

Again, in the two bi-amp systems I have used, no line level crossover was
needed (below statement ???).

hope this helps

"MYKEY" wrote in message
news:gDGcc.199077$1p.2268508@attbi_s54...
Biamping skips the usual passive crossover inside your speaker. Instead
the
crossover is electronic, part of the preamp path. Separate amplifiers for
hi
and lows. Separate speaker wires too. I like triamping or four way.
You will gain headroom and much less distortion, much greater control.
This may be state of the art, but a system can be built reasonably priced.
I built a 3 way system for less than 1000.00.

Franco Del Principe wrote in message
news:Byncc.76584$gA5.916604@attbi_s03...
Art M wrote:
Would someone please give me a simple overview of Bi-amping and it's
pros
and cons. I know a bit about it but I am not super clear on how one
would
go about it with two distinct amps (vice bi-amping a multi channel amp
to a
two chanel system).

How do you match the amps output? How do you split the audio signal
into
both amps? If there is a good article on the whys and hows please
point me!

Thanks
Art


I am listening to a bi-amped system for a couple of years
and I love it. The main reason I bought it was that I could
audition the normal and bi-amped versions in a sighted
comparison in the store. The bi-amped system had just more
punch in the lows and in the highs, more life, more clear
imaging.

This is how it was implemented. The speakers are Rowen, a
Swiss manufacturer of fine speakers and amps. He happens to
be the official reseller of NAD products in Switzerland.
First, he split the original passive crossover in the
speakers (two ways) into highs and mid/bass. Then he build
an active crossover (3.5 kHz) into the power amp (NAD 912).
The source signal goes into the pre-amp section of the
integrated amp (NAD 304). From there into the poweramp which
amplifies the highs. The output of the crossover can be
adjusted (to match the two amps and to adapt to your
listening room) and is fed into the power section of the
integrated amp which amplifies the mid/bass.

As speaker cable I use one stranded 8 x 0.8 mm2 solid core
wire. 2x3 strands for the mid/bass, 2x1 strands for the
highs. The amps have only about 30 Wpc sine rms, 200 W into
2 Ohms. But since the speakers have a sensitivity of 89
dB/W/m and a bandwidth from 35 Hz to 22 kHz there is plenty
of power for me.

Cheers,
Franco