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Technical and scientific discussion of amps, cables and other topics.

Re: Well, I never suggested any sound card...

Andy wrote:
"Experts? Clark openly admits science does not apply to audio so how can he be an expert. I do not know much about Jon other than a few wacky statements about cables which would seem to be rather a hindrance to a claim to be an expert in any area related to scientific thought."

It is easy to be uninformed, but that is still no excuse for not even bothering to look. I seem to recall one of the more famous objectivists that used to post here that insisted that other people look things up for themselves. I am not claiming to be an expert on DBT's, but I have studied things a bit, done some controlled listening tests (which are the basis for my DIY audio cable designs), and provided DIY information over a wide range of topics that is pretty much well accepted and taken to be valuble and worthwhile as DIY projects.

Well, I'll make it easy by providing the URL's and info here.

My AES paper is preprint #3178, "A User Friendly Methodology for Subjective Listening Tests", presented at the 91st AES convention, October, 1991. I can send a free copy to anyone who requests it via e-mail, or if you are stubbornly independant, you can purchase a copy at the AES website it is available for $5, and can be ordered from:
http://www.aes.org/publications/preprints/search.html

Posts about ABX/DBT:
A discussion of selected ABX/DBT issues:
http://www.audioasylum.com/forums/prophead/messages/2190.html
http://www.audioasylum.com/forums/prophead/messages/2579.html
http://www.audioasylum.com/forums/prophead/messages/2580.html
and related:
http://www.AudioAsylum.com/forums/prophead/messages/3100.html
and
http://www.audioasylum.com/audio/general/messages/88709.html

I have also given a paper on a new test signal I developed, a copy of this can be had for the asking, the text is at:
http://www.geocities.com/jonrisch/PhiSpectral1.htm
"A NEW CLASS OF IN-BAND MULTITONE TEST SIGNALS"
by Jon M. Risch, presented at the 105th Convention of the Audio Engineering Society, 1998 September 26-29th, San Francisco, California as preprint #4803

Some of the other DIY subjects that are not audio cable related are:
DIY Acoustics projects and advice/info
See: http://www.geocities.com/jonrisch/a.htm

(and in point of fact, I will say that I _am_ an expert on acoustics, I even have a patent for a new and basic acoustic principle.
Loudspeaker with Differential Flow Vent Means, #6,549,637
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/PTO/srchnum.htm&r=1&f=G&l=50&s1=6,549637.PN.&OS=PN/6,549637&RS=PN/6,549637

DIY Isolation Transformers and Balanced Power
http://www.geocities.com/jonrisch/catch2.htm

DIY AC Line Filters
http://www.geocities.com/jonrisch/surge.htm
AND
Digital Audio Component Isolation Filter
http://www.AudioAsylum.com/audio/tweaks/messages/43988.html
and
http://www.AudioAsylum.com/audio/tweaks/messages/44145.html
Steve Eddy schematic (top picture)
and
my additional "tweak" for the Digital Iso Filter:
http://www.AudioAsylum.com/audio/tweaks/messages/47160.html

A New and Unique Speaker Crossover Topology:
http://www.geocities.com/jonrisch/LBIseries.htm
http://www.geocities.com/jonrisch/LBIseries2.htm
and so on (see bottom of pages for next page)

Other patents I hold:
Record Handling Device, #4,452,480
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/PTO/srchnum.htm&r=1&f=G&l=50&s1=4,452480.PN.&OS=PN/4,452480&RS=PN/4,452480

Augmentation Amplifier #5,586,194
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/PTO/srchnum.htm&r=1&f=G&l=50&s1=5,586194.PN.&OS=PN/5,586194&RS=PN/5,586194

Patent Pending:
Method and apparatus for creating a virtual third channel in a two-channel amplifier APP #20060013406

Other work I have been involved in:

Fundamental research into vinyl record playback:
http://www.audioasylum.com/audio/general/messages/444040.html
http://www.audioasylum.com/audio/general/messages/441848.html

Design and UL liason for an AC power line filter and surge suppressor:
http://www.audioasylum.com/audio/general/messages/133254.html

Jon Risch


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