On Sat, 06 Nov 2004 14:29:18 +0000, Andy Evans wrote:
Don't feel bad about this, Andy. I think I can safely say that we have
*all* gone through this. It appears that human hearing is easily fooled by
psychological factors
Hello Mick - I'm a psychologist specialising in music and musicians, as it
turns out, so I'm not unfamiliar with psychological factors! Anyway, to
grin
start from the beginning - I sought to replicate the CD transport of
Japanese designer Junji Kimura, who worked for Pioneer, Trio and Kyocera.
He uses a thick aluminium slab to support the transport. See
http://www.soundstage.com/revequip/4...rogression.htm I talked
That's one interesting-looking setup...
to this guy at the London HiFi Show. He is quite eccentric, but
definitely recommended mounting the transport on an alu slab. I was
using a CD-ROM at home which was rather 'shouty'. I changed the
switchmode PSU for a normal toroid, which helped a bit, then mounted the
Now that I can understand. The psu may be letting noise through to the DAC.
unit on an alu slab, which helped more, particularly smoothing out
highly modulated pasages. If you pick up a CD-ROM while it's playing you
That's the bit that makes me a bit sceptical - I'm not denying that you
may be right. Its just that without *measurements* you are unlikely to
convince many people.
can feel the vibrations quite clearly, so we know that there is
vibration present. Now, to my ears there was a significant change in the
I agree about the vibration. I would suspect that the system would have
been designed to handle it in the first place though.
sound, not just a slight change which I would - just as you say - be
sceptical about and attribute to 'causes unknown'. I posted this in case
I don't have access to large lumps of ali, but I may be able to get a lump
of 6mm steel plate to try something similar. It should give a suitable bit
of inertia to the system...
it was of some use to other ng members - its useful to hear about
various tweaks even if they might not be relevant or replicable in one's
own system. Fine. But I also asked if anyone else had an explanation or
empirical evidence of the effects of damping on CD mechanisms. I've had
various responses, none of which are based on empirical evidence of
exactly that. So if this is outside the experience of those posting, It
would be honest and simple to say "Sorry, Andy, I don't have any
experience of this". Since I would be interested in some empirical
Fine! "Sorry, Andy, I don't have any experience of this". I might give it
a go though! After all, I have an old CDR drive and it wouldn't be all
that hard to rig it up with and without a lump of steel plate to add mass.
knowledge, I'll post this on other forums and ask some of my friends in
the audio industry. As I said at the start, this is based on an actual
product, the designer of which clearly does have empirical knowledge.
I'm afraid that I'm a bit sceptical about some of the product designers
- especially those who produce "new wave art" appearance equipment at
high prices. I have this horrible suspicion that they may well be selling
brand X snake oil... Sometimes I'm wrong. The Michell Gyrodeck is really
excellent and that is rather odball in appearance!
--
Mick
(no M$ software on here... :-) )
Web:
http://www.nascom.info
CD transports and resonance
Linear Mode
