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In Reply to: Help! Musical Fidelity A3Cr amp owners! posted by nousaeous on August 31, 2002 at 19:06:05:
Well, at least I have *an* answer. The crosstalk between channels - signal from from channel audible through the other - is a common trait of Musical Fidelity amp's if not much of their range.Other Asylees have mentioned the same problem, and this was one of the main reasons I did not buy the A300 a couple of years ago. I just could not adjust to the idea that I was not going to hear each channel where it should be and nowhere else.
Also, if you have two sources attached and turned on but only one playing, you may be able to hear it when selecting another source - another case of breakthrough.
You are right about it being a major flaw. This is simply a case of poor design - particluarly when they make a lot about their stuff being dual-mono amp's.
Follow Ups:
Used an A300 for quite some time. No crosstalk and the integrated amp is dead quiet at all volume settings.
About crosstalk between input channels - wouldn't that be case of a preamp design problem?What's surprising is that this amp got great press. Why is it that a supposed major design flaw has not been exposed or even much discussed?
Is there something I'm not getting?
From reading your posts, it looks like there is only one RCA from the pre going into one channel.Shouldn't you check for crosstalk with the unused input shorted ?
Maybe one of the helpful engineers here can assist with a simple test for crosstalk which will reassure you that your amp is within its spec.
Shorting plugs on unused inputs is a good idea anyway- check the Tweakers Asylum archives for more info.
good luck
john dem, fresh from some very cross talk at the Vinyl Asylum
Does it matter since the A3Cr is supposed to be a "dual mono" design?
a single chassis but both channels have completely independent circuitry and independent power supplies.The proximity of the leads/tracks from L and R however can be very tight on a particular input, or throughout an amp- I'm sure one of the designers here could give some more detail on how proper design and layout can minimize problems, but with one unconnected input on your power amp picking up and amplifying signals from the nearby active channel(s)- you may expect some crosstalk to be audible.
I have a test cd somewhere from Denon with test tones on each channel for crosstalk measurements- maybe you can hunt up a similar CD and check the crosstalk with some degree of certainty.
even with the unused input open or unshorted on one channel as described in this thread.
G.
Crank it up...
hehehe. Pretty poor if this is true...what is the channel crosstalk spec for the amp then??
G.
Crank it up...
Surely MF should be able to get this problem sorted.
Michaelson has been designing his amps for many moons
now.Although some of the MF sure looks the part.Much
better than the early stuff
Happy listening Wordsmith.
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