Thanks for the clarification Roscal
FYI all Laing pumps with a manufacture date of 7/04 or later are the same
I followed your procedure and set the volume of the D4 to a level that I thought was representative,
and under the listening conditions the other 3 pumps were inaudible
so what were the "listening conditions" ?
the 'source' was a pair of stereo desktop speakers each with a 4" speaker + a tweeter
my wife's mini tower is on the desktop with a single fan in the psu, making too much noise apparently
re the D4, again, it has a spike at 4k Hz - which is a somewhat 'high' frequency and easily recognized once heard
Roscal's recording seems to have dropped this pitch somewhat (??), or my speakers ??
and yes bk, like fans the sound emanation is not uniform; sides about the same while the top and bottom are each different
while a defined procedure will address some of this, it is the 'calibration' of the listening environment that is troublesome
- and the ratty sound coming out of 2" speakers, or 4" + tweeters, etc. etc.
if something is better than nothing then, as JoeK would say, its all good
I have reservations
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