DIY Interconnect questions
On Wed, 10 Dec 2003 12:52:17 -0500, "Arny Krueger"
wrote:
"Colin Bigam" wrote in message
. com
Well much of my planning is based on a pair of articles by Jim
Heyward in Audio Ideas Guide. He pointed out that with a badly
designed preamp (specifically he talks about one where the output
feed is taken directly from the wiper of a 250kohm volume pot, so
the output impedance is not only outrageously high but varies
with volume) and a badly designed interconnect, you can have a
3dB cutoff at below 3kHz!!! Using the same (bad) cable on low
output impedance preamp lead to a cutoff of about 1.5MHz.
Did I miss the part where he provided a real world example of this?
I've perused the schematics of more than 100 preamps and never seen anything
as ludicrous as a preamp with the output taken from the wiper of a 250 K
pot.
There are a number of so-called passive preamps which are nothing more
than a switch and a pot. Could fit this example.
If there ever was a preamp this badly designed, it seems like switching over
to one of the zillions that was well designed would be the superior
approach.
But of course!
Kal
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