13 Sep
2008
13 Sep
'08
9:50 a.m.
On Sat, 2008-09-13 at 01:25 +0300, Jussi Laako wrote:
Jens M Andreasen wrote:
Hey, slow down, you are getting ahead of me now ... :-D
One of my (two) power amplifiers is starting to show it's age. spewing
out little bursts of noise at random intervals. So they therefore both
are in in for a replacement.
The target is a set of JBL Roadversion from early 80:s. They have a
steady drop of 3dB/octave north and south of 1000Hz, easily corected by
setting bass and treble on ones simple keyboard mixer at two o clock.
They have been beaten and kicked by amateurs when hired out as well as
endured all of my own mistakes, but are still perfectly functional ...
In other words, these are the WW2 Willis Jeep of loudspeakers, not going
anywhere.
Anyways ...
Finding a replacement for the 250 Watt ACM1 with no fan (silent!) that I
am currently using proved to be a challenge though. People are not
building that kind of gear these days anymore, at least not within my
monetary budget.
Findig a silent poweramplifier in the 75 - 125W range is a lot easier,
so ...
Why not feed the two 12 inch's in each cabinet from each of their own
poweramp, using each a souurce of their own? This would be the
equivalence of - no, actually just like - using two DAC's in paralel
that you proposed above.
With a 24bit signal of +/- 15 integer values, we
would be drowned in
noise. But since this is foremost a theoretical discussion, let us stick
to those numbers.
What might be more useful would be to use two DACs in parallel followed
by high quality mixing electronics. In a way some highend audio hardware
does. Then non-error signals get amplified and error-signals might get
even attenuated (given the error signal is not the same for both channels).
BR,
- Jussi