On Sat, 10 Nov 2007 17:36:30 +0000, Rob
wrote:

Don Pearce wrote:
On Thu, 08 Nov 2007 00:37:15 +0000, Rob
wrote:


This is looking rather strange. The graphs at the link (top of page)
illustrate similar cartridges on two (very) different turntables and
arms. It's explained in the text - perhaps it's not clear? The point I
was trying to make was the similarity between the two setups. The spikes
at 300/3000 are, I would have thought, on the record. Misuse of the
software is another pretty likely explanation of strange results btw.

Anyhow, I've posted a couple of 20-20,000 sweeps at the foot of the page.

http://patchoulian.googlepages.com/audiosamples

I've downloaded both of those sweeps, and they do indeed contain those
odd resonance, plus a pretty big one at about 30Hz. I would have
thought this was almost certainly a cartridge/arm incompatibility.

I can't see any sign of misoperation of the software.

d


I've tried it with the old cartridge on a Rega TT. The trace looks
virtually identical to me until 16kHz (when things start looking very
different), and little like your experience. The Rega looks more linear
at higher frequencies. I think this rules out arm/cart incompatibility?
Samples at the foot of the page:

http://patchoulian.googlepages.com/audiosamples

I can't see anything odd ('spikey'?!) at 30Hz, and the software
(Audacity) doesn't export numbers below 86Hz.

Perhaps this cartridge is incompatible with a very large range of arms?
It shows the same pattern on a Rega, Japanese clone, and the Project.

My guess is the record. But that guess comes from interpreting the
results the software churns out.

Rob

Puzzling - I suppose that may be a faulty record, since it appears to
show the same problems at the same frequencies whatever you do.

d

--
Pearce Consulting
http://www.pearce.uk.com