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Welcome>Readers Letters
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| Index
of Readers letters (issue 57)
From: Rob Radcliffe - Vinyl recording frequency range
reproduction with tracking weight?
From: Dr.-Ing. Michael Graw - Cross talk cancellation
the 21st century hi-fi standard?
From: Nigel Briggs - Beauty in the eye of the beholder
A published sample of letters to hi-fi+
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Currently
Available in shops
 UK
and Europe - ISSUE 57 (March 2008)
North
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Dear
Sir,
I sat front row centre at one of your demonstrations at the Manchester
Hi-Fi show and thought that, in general, you clearly showed the value
of accurate positioning of the cartridge (using a two point protractor),
adjusting VTA for each record, use of a mono cartridge and use of replay
‘curves’ for specific record labels. However I must raise
the issue of an error I think you made during the demo. You talked about
both low and high frequencies being attenuated during the production of
records to allow the signal to be cut onto the record. Whilst I agree
with you about low frequencies it is my understanding that the high frequencies
are boosted during this process and that it is the job of the phono-stage
to apply the necessary cut to the high frequency signals - so the RIAA
curve would perhaps be better thought of as a slope.
That aside the issue of different replay
‘slopes’ is one I now intend to investigate - for instance
is the difference worth worrying about on a £1200 phono-stage rather
than the £12000 pound we were lucky enough to hear. Final point
couldn’t the differences we heard due to VTA just as easily be brought
about by adjusting tracking weight and hence SRA?
Regards
Rob Radcliffe.
Firstly, you (and a few other people)
were absolutely correct in that record replay curves boost – not
cut – the treble; one of those errors that got into the first rehearsal
and never got corrected.
Apologies all round.
As to your questions: the differences
are perfectly audible and just as musically important on the VAC pre-amp
($5000 all in) and also the Graeme Slee Jazz Club, which will be reviewed
in the next issue. So yes, it is worth worrying about. Adjusting tracking
force will indeed adjust VTA/SRA. However, do you really want to (and
is it sensible to) vary your tracking force on a record by record basis?
Far better I would suggest to have properly engineered arm height adjustment.
Ed.
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Dear
Sir,
From my point of view your column (Playing The
System in Issue 53) hits the basics concerning high-fidelíty
and realism. And your final rhetorical question “Why not listen
to mono?” is the only conclusion to be drawn.
In my experience growing up with recorded and electronically reproduced
music the best (most pleasant and realistic) sound I ever got was from
my first mono radio receiver. After 30 years of futile tweaking and optimizing
- based on both international reviews and discussions with system designers
- my stereo system in order to came to a similar aural sensation, I finally
found the theoretical and practical explanation for my disappointment;
“crosstalk” between the two speakers in a stereo set up and
their generation of comb-filter effects/artefacts inevitably confusing
the ear-brain-system.
Crosstalk cancellation (XTC) is the solution,
commercially available today in the latest Version of the TacT RCS 2.2
XP room correction pre-amp/processor. The articles on www.ambiophonics.org
give most convincing grounds for the shortcomings of classical stereo
designs and their elimination. The gain in realism and reproduction of
the original staging is overwhelming, with the added benefit of hitherto
unheard details that where buried by the crosstalk effects. And XTC does
a fantastic job in a two speaker system without complementary surround
speakers!
I am looking forward to reading your evaluation
of this concept in hi-fi+ - in my view a substantial step forward towards
a 21st century high-fidelity standard.
Regards
Dr.-Ing. Michael Graw
Luebeck, Germany
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Dear
Sir,
I would like to react to Jimmy Hughes’ Home Truths piece in Issue
56, by quoting an extract from a song by that great artist Melanie
- “a thing is a phallic symbol if it’s longer than it’s
wide”!!! In other words, sexuality like beauty is in the eye of
the beholder (or should that be listener?). Or if you want the pedantic
version according to reception theory - it only exists in the interaction
between the work of art and the reader/listener/viewer.
Using Naim amps I can only agree with Paul
- unplugging everything a couple of times a year is great for the sound
(and that includes all the boards in a NAC72). The same goes for Moth
isolation tranformers (big ones!). If he really wants an ordinary Schuko
to IEC, I think I can afford to post him one or two of the several that
are sleeping in the kitchen cupboard!
Great mag.
Yours,
Nigel Briggs
Lyon, France
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