"Bassplayer12" wrote in message
"Arny Krueger" wrote in message
. ..
"Bassplayer12" wrote in message
Greetings folks
I'd like to have some opinions.
I have a pair of JBL XPL-200's: 6ohms, 91db. Recommended
power, minimum 200W, peaks of 800W.
Large, nearly full-range fairly efficient home speakers.
Actually they are 90db. Sorry.
90 dB is fairly efficient. 82 dB is low efficiency. 98 dB is high efficiency
Reviews can be found he http://tinyurl.com/2n64nr
http://manuals.harman.com/JBL/HOM/Ow...l/XPL200om.pdf
I already have 2 of the printed version.
I posted it like it was a footnote.
Presently, I have a Denon DRA-685 receiver driving the
100 wpc
highs and mids and a Denon POA-2200 200W power amp for
the bottom.
Crossover: JBL pro.
Which one?
I have a
professionnal Model 5234. It seems to be doing the job.
Pretty inflexible, given you have to use a different plug-in module to
change the crossover frequency, and the relatively low slopes.
The present setup made a difference from before when the
POA-2200 was doing the entire job by itself.
And the difference was?
The low end, man. The low end! Quite a bit more with the
bi-amp configuration
than with only the POA-2200.
That could be due to the differences in the crossovers.
Being a cynic, I would presume that switching a speaker
from using its internal crossovers to the use of an
external crossover with a lot of user adjustments and
randomly-chosen amplifiers would produce audible
incidental frequency response changes. There would be
some increase in dynamic range, but this might be far
less noticable than the incidental frequency response
changes. On balance, if you tuned the crossover so that the
system sounded better to you, it is possible that you
would have used the extra adjustments to better tailor
the speakers to the room, other components in the
system, your favorite music sources and your general
sonic tastes.
Actually, there aren't much in terms of adjustments on
the crossover.
Agreed.
This being said, I am using a Yamaya EQ, model Q2031.
Seems nice.
I just recently purchased a used Bryston 4B (approx 20
year old but excellent condition).
Nominally, 250 wpc.
With 6 ohms speakers, how much power would that be? Any idea?
That isn't speced and can only be estimated. I'd estimate that the power
output of the two amps under real world conditions would track each other.
Is the 4B enough to drive both speakers by itself or
should I substitute it for the Denon power amp and keep
the rest of the setup as it is?
Replacing the POA-2200 with the 4B and Bypassing the
amplfiiers in the receiver with the POA-2200 seems to be
the more logical choice.
If the power of the receiver is enough for the mids and
highs, I could sell the POA-2200
and the pre-amp that came with it and that would help pay
for the 4B. That's what I'm looking
at.
Not a bad idea. Yes, the receiver has more than enough rated power to do
its share, which is smaller than that of the others by quite a bit.
I would venture to say that the POA-2200 is a little
bit of an overkill to drive the highs and lows.
Your opinion on this?
The POA 2200 is overkill for the highs and pretty light for the lows, given
the sort of amp you have driving the highs. The high frequency amp only
needs to have 1/4 the power of the low frequency amp according to JBL .
This will produce a gain in available dynamic range on
the order of 3 dB, which is not huge.
Page 6 of the manual suggests that the receiver was more
than adequate, and that your current configuration is a
more optimal use of resources.
Looking at the overall situation, the more optimal
choice would be leave the receiver and POA-2200
connected to the speaker as they are, and use the 4B to
drive your new subwoofer. The XPL-200 is speced to be 6
dB down at 35 Hz, so a substantial subwoofer could yield
major improvements in sound quality.
The JBL's don't produce enough good bass response?
They don't compare to what you'd get with a good subwoofer added on.
driver of choice fi car audio q18 - www.ficaraudio.com
That's what I would do, given the equipment on hand.
Thanks for your input.