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(TChelvam) wrote:

Kalman Rubinson wrote in message
...
On 9 Jul 2003 14:31:02 GMT, (TChelvam) wrote:

The general recommendation is to use all identical speakers for SACD
multichannels though I wonder why you need full range for the rear or
center.

That depends on whether you have any bass management control for SACD.
If not, there are many discs which have significant bass in center and
rear channels. (The Linn SACD of the Poulenc Organ Concerto has the
organ in the rear channels.)

Yes, I agree with you. unlike Dolby prologic surround the SACD rear
output carries more than ambience retrieval. Track 4 of Dark Side of
the Moon will vouch for that.

Anyhow, depending on your budget. Top priority is front
channel followed by the Center. Get a good subwoofer with volume and
crossover at cut off point of 120hz.

Too high. You want the cutoff between main and sub to be 80Hz or
less. The lower the better.

While 120 Hz may be too high for some systems there are no general rules here.
It depends on the subwoofer, its placement, the room and the listening
position.

For example my personal subwoofer system will produce 120 dB from 12 to62 Hz
with less than 10% distortion. Yet I use a 120 Hz electronic crossover. Why?
Well the main subwoofer is rolling off naturally around 70 Hz, which fits
prefectly with the mains at nominal levels.

But I have this dynamic compression problem at 80-120Hz because my mains (twin
active 6.5's); center (single Active 6.5) and 4 surrounds (Active 6.5 pairs in
each) cannot keep up dynamically with the subwoofer. My solution is a pair of
powered 10-inch 'subwoofers' running between 45 and 100 Hz and the 120Hz XO for
the sub.

There is no locational penalty; no resolution penalty and no response penalty
using a 120Hz XO frequency. It just works.

I think 120Hz should be reasonable. Sony SACD players' cut off point
is 120hz and redirect all signals below that to the sub in the event
your other speakers are too small to output low frequencies. Me,
despite having a full range front speakers (38hz) still using sub with
the crossover cut off point set to 55 to 65hz. The volume is at 10. I
think for a true high wnd system the lower the sub cut off the better
it is but on budget level I would bet for the higher would probably be
better.

A typical problem with small systems is that the 'subwoofer' often doesn't have
enough higher freqeuncy capability to mach satellites that are dynamically
challenged below 150 or 200 Hz.

At least the other speakers and amp can concentrate on the mid
and high.

I have just gone in into Multi/surround. and I don't use identical
speakers. I am using my old front speakers for rear and my best for
front(full range) and dedicted center speaker.

That can work just fine.

And a sub...

That's a fine way to step into multichannel. It also doesn't hurt that the
original 2-channel set-up was often optimized for position and balance as well.