HDTenEightyP/NetNews huggingface dataset:
From: mmccann@eng.clemson.edu (Michael McCann)
Subject: Advent BabyII tweeter
Reply-To: mmccann@eng.clemson.edu
Organization: Sun Microsystems, Inc.
Date: Mon, 31 Aug 1992 15:17:46 GMT

Does anyone know where I can get a factory replacement for the
tweeter in a Baby AdventII speaker?  I moved recently and the 
tweeter got trashed (completely dead, no sound at all...I put it in
my other speaker to test it).

Thanks for your help in advance,
---
Mike McCann       (803) 656-1228   Internet = mmccann@eng.clemson.edu 
Engineering Computer Operations      Bitnet = mmccann@clemson.bitnet
113 Riggs Hall
Box 340904
Clemson, S.C. 29634-0904         DISCLAIMER = I speak only for myself.
From: philg@zurich.ai.mit.edu (Philip Greenspun)
Newsgroups: rec.audio
Subject: Re: Accessing Sony's optical digital output
Date: 26 Aug 92 22:05:16 GMT
Reply-To: philg@martigny.ai.mit.edu
Organization: M.I.T. Artificial Intelligence Lab.
In-reply-to: gjmg6749@uxa.cso.uiuc.edu's message of 21 Aug 92 04:13:55 GMT


In article <BtBFr7.3Jz@news.cso.uiuc.edu> gjmg6749@uxa.cso.uiuc.edu (Geoffrey J Maxson) writes:


   I recently was involved with a electronics project
   in which I took CD-player output and converted it to standard digital
   I thought that this would be cool to use with my Sony CDP-515,
   but I can't seem to find an optical connector for the CD player that I 
   can convert to a TTL or CMOS level to use with my electronics.

   Anyone know anything about this?

The only source I know of in the United States for this connector is
SMK, an honorable Japanese company.  You just have to find their local
distributor.  Unfortunately, they may not have samples and the lead
time is something like 12 weeks.  One thing you might try to do is buy
a connector from one of the tiny audiophile companies that advertise
D/A converters in Absolute Sound or Stereophile.

Just remember that we live in the Third World as far as consumer
electronics go.  It is almost impossible to buy the ingredients of
consumer electronics products here at competitive prices.

Philip Greenspun
MIT Department of EE
From: eisenhof@zax.eda.teradyne.com (Karl Eisenhofer)
Newsgroups: rec.audio
Subject: Re: Where can I find the Nyquest theorem
Date: 1 Sep 92 20:07:44 GMT
Reply-To: eisenhofer@maven.dnet.teradyne.com
Organization: Teradyne, Inc. Boston MA

In article <1992Aug31.114555.17504@discus.technion.ac.il> sorin@techunix.technion.ac.il (Goldenberg Sorin) writes:
>Question
>A signal say x(t) is bandlimited to W hz.
>I produce a signal x'(t) by multiplying the original signal x(t) by 0 at
>times i/2/W. x'(t)'s spectrum is the same as x(t) s. Then I sample x'(t) 
>at time i/W/2, so I get a sampling frequency of 2W. All the samples will 
>be 0, so I can't construct x'(t) from it's samples. What went wrong ?

What went wrong is that x'(t)'s spectrum is NOT the same as x(t)'s
spectrum.  In fact, the multiplication step introduced a whole slew of
high frequency components (all the way up to infinite frequencies)
into the signal.  Now this signal is no longer bandlimited and the
Nyquist theorem does not apply.  The samples that you get will construct
and alias of the signal (in this case, an alias with frequency 0).

I am doing this from memory, no textbooks or anything, so please
flame gently (also, this is not my area of expertise).

Karl
-- 
Karl Eisenhofer  SPIKE  eisenhofer@maven.dnet.teradyne.com
"Searchlight casting for faults in the clouds of delusion"
From: ahaley@eoe.co.uk (Andrew Haley)
Newsgroups: rec.audio
Subject: Re: How do I use a "bias fine adjustment?"
Date: 27 Aug 92 09:07:55 GMT
Organization: EO Europe Limited, Cambridge, UK
X-Newsreader: Tin 1.1 PL3

Janne.Anttila@lut.fi (Janne Anttila) writes:
: In article <1381@eouk9.eoe.co.uk> ahaley@eoe.co.uk (Andrew Haley) writes:
: 
:    The recording level doesn't matter that much for bias setting.  Use a
:    realistic level, and choose the setting that sounds most like the
:    source.
: 
:    Andrew.
: 
: Actually the level does matter, since many decks can't reproduce
: the highest treble at higher recording levels. Even if the frequency
: response of the deck goes up to 20 kHz at -20 dB, it might only reach
: 9 kHz at 0 dB, especially with normal type tapes. If you record pink 
: noise at 0 dB and try to correct too little treble by reducing bias, 
: you will probably get peculiar results.
: 
: I usually do the bias setting at -20 dB.

This is fair enough; it's also an argument for recording at lower
levels.  But surely what is required is the best possible sounding
recording with real music.  My argument is simply that if you don't
happen to have a source of pink noise on a shelf (and I assume that
the original questioner didn't) it's best to optimize real world
listening conditions.

Andrew.
From: css1rs@gondor.mcs.surrey.ac.uk (Russell Smithers)
Newsgroups: rec.audio
Subject: Bose Acoustic Cannon
Date: 2 Sep 92 12:18:28 GMT
Organization: University of Surrey, Guildford, England
X-Newsreader: Tin 1.1 PL4

What extactly is it? and what's so good about it?
Newsgroups: rec.audio,rec.video
From: wang@mercury.ncat.edu
Newsgroups: rec.audio
Subject: Mods for Radio Shack M7 speakers
Date: 1 Sep 92 19:57:32 GMT
Organization: North Carolina A&T State University

Sometimes ago there were discussions on how to modify Radio Shack M7
speaker, can someone repost or e-mail me the info please.
Thank you.

TK Wang
wang@csa.ncat.edu
From: fpf@gasco.com (Frank Ferguson x3584)
Newsgroups: rec.audio
Subject: PAS 3 Preamp Modifications
Date: 25 Aug 92 23:58:31 GMT
Article-I.D.: gasco.1992Aug25.235831.6423
Distribution: na
Organization: NorthWest Natural Gas Company, Portland Oregon.
Originator: fpf@taurus


I have a Dyna PAS-3 tube type preamp I would like to modify.  At the very
least, I'd like to bypass the tone controls.  Others have suggested
improving the power supply or even installing major circuit modifications
such as those available through Curcio.  Could anyone provide information
on what modifications are useful, where detailed information on PAS mods
can be had, where parts or commercial mods might be got.  

I am neither an electrical engineer, nor a service tech.  I have assembled
a number of PAS 3's from kit, and have at least an idea of what a circuit is.
Any help is appreciated.

Thanks
Francis Ferguson
fpf@gasco.com
Newsgroups: rec.audio
From: milano@IASTATE.EDU (Alissa Milano)
Subject: Re: Bose AM-7
Reply-To: milano@IASTATE.EDU (Alissa Milano)
Organization: Iowa State University
Date: Thu, 3 Sep 1992 15:30:26 GMT

	I have seen some netter gave some very good comments on Bose Am7/5.  I was
planning to buy the Bose AM-5 when I read the articles about how good is
Cambridge Soundworks compared to the Bose-AM5.  I've listened to Bose-AM5 before
and I can see that it produces spacious and clear sound.  
	Can anyone in the net who owned the Bose AM-5/7 and Cambridge Soundworks gives
some comments about these satellite systems?  I've never listened to Cambridge
Soundworks before and your comments may urge me to try it out.  :)


milano@iastate.edu
From: jdhill@star-trek.bbn.com (Jack D. Hill)
Newsgroups: rec.audio
Subject: Oregon Triode Society
Date: 1 Sep 92 16:10:15 GMT
Article-I.D.: news.la75f7INNfev
Reply-To: jdhill@BBN.COM (Jack D. Hill)
Organization: Bolt Beranek and Newman Inc., Cambridge MA
NNTP-Posting-Host: archive.bbn.com



	I would like to make a pitch for an interesting magazine that was
brought to my attention - Positive Feedback. Positive Feedback is a publication
of the Oregon Triode Society. The OTS was formed 3 years ago by a handful of
audiophiles and has grown to 180 strong. They hope to continue growing and if
the quality of their magazine is any indication, they should do very well
indeed.
	For those put off by the name of the group (i.e. Triode), they do not
deal strictly in tubes. In fact, based upon the one issue I've seen, about
20-30% of the articles are about tube equipment. The rest covered recordings
(both classical and jazz), various digital topics, equipment comparisons and
reviews, technical articles, audio industry news, tips and tweaks, and some
hilarious cartoons by one Bruce Walker.
	Membership entitles you to one year's subscription (6 issues) to
Positive Feedback as well as attendance and participation in the OTS. Price is
$15 US, $30 Canada and $40 outside of the USA.

OREGON TRIODE SOCIETY
4106 N.E. Glisan
Portland, OR  97232
(503) 235-9068
Newsgroups: rec.audio
From: znpt01@trc.amoco.com (Norman P. Tracy)
Subject: Re: Accessing Sony's optical digital output
Originator: znpt01@gpss43
Organization: Amoco Production Company, Tulsa Research
Date: Fri, 28 Aug 1992 20:41:02 GMT


In article <PHILG.92Aug26180516@zug.ai.mit.edu>, philg@zurich.ai.mit.edu (Philip Greenspun) writes:
> 
> In article <BtBFr7.3Jz@news.cso.uiuc.edu> gjmg6749@uxa.cso.uiuc.edu (Geoffrey J Maxson) writes:
> 
> 
>    I recently was involved with a electronics project
>    in which I took CD-player output and converted it to standard digital
>    I thought that this would be cool to use with my Sony CDP-515,
>    but I can't seem to find an optical connector for the CD player that I 
>    can convert to a TTL or CMOS level to use with my electronics.
> 
>    Anyone know anything about this?
> 
> The only source I know of in the United States for this connector is
> SMK, an honorable Japanese company.  You just have to find their local
> distributor.  Unfortunately, they may not have samples and the lead
> time is something like 12 weeks.  One thing you might try to do is buy
> a connector from one of the tiny audiophile companies that advertise
> D/A converters in Absolute Sound or Stereophile.
> 
> Just remember that we live in the Third World as far as consumer
> electronics go.  It is almost impossible to buy the ingredients of
> consumer electronics products here at competitive prices.
> 
> Philip Greenspun
> MIT Department of EE

I obtained a Shimadzu (the company called SMK above?) TOSLINK receiver from:
Soltec
12977 Arroyo St. San Fernando CA 91340 (800) 423-2344

For CD standard you need model # HK-3131-01 which costs
about $15. I also bought a cable part # HK-3902 for $44.50
to help make it worth their while to mess with a one'se order.
A transmitter is part # HK-3131-03 also $15.  As Philip warns
lead time was weeks.

I have literature for the Mitsubishi parts which are numbered:
RFB4011 T (transmitter) and RFB4011 R (receiver) and RFA4011-01
(kit with transmitter/receiver/cable). They can be reached at
(212) 605-2000, I have not done business with them and thus have
no prices or experience with their attitude towards small orders.

I have been told Hewlett Packard also makes TOSLINK parts but my
HP fiber optic book is hopelessly out of date so I'll just give
you their name as a lead. If anyone has more info please pass it
along as HP has a excellent distribution network.

I would also point out that the only reason I fool with the TOSLINK
is that a DAT recorder I own does not have a coax out, the TOSLINK is
generally regarded as the least of the S/PDIF transmission carriers.

Norman Tracy (znpt01@trc.amoco.com)
Xref: sparky rec.audio:11802 rec.video:10553
From: ST403383@brownvm.brown.edu (Thai Pham)
Newsgroups: rec.audio,rec.video
Subject: Re: A/V Prologic Receivers--FULL SUMMARY!
Date: Tue, 25 Aug 1992 22:03:00 EDT
Organization: Brown University - Providence, Rhode Island  USA
NNTP-Posting-Host: brownvm.brown.edu
News-Software: BNN via BNN_POST v1.0 beta

In article <1992Aug25.213414.14016%jim.uucp@wupost.wustl.edu>,
mike%jim.uucp@wupost.wustl.edu (Mike Suter) said:
>Posted on 25 Aug 1992 at 16:34:14 by Mike Suter
>
>A/V Prologic Receivers--FULL SUMMARY! [LONG]
> ....
>----------------------------------------------------------------------
>Yamaha
>----------------------------------------------------------------------
>Yamaha comments:  Their surround decoding (as well as sound quality
>                  in general) is almost universally praised.  Their
>                  units may not have as many 'gadgety' features as
>                  the above units.
>
>DSP-A700        -- low price: $500    (60w/chan main, 15w center, 15w rear)
  The A-700 is a seven channels amplifier/signal processor only. i.e. it
does not switch sources for you.  Has most of the features of the
A-1000.  A few less modes.  But it has been discontinued.

>DSP-A1000       -- low price: $1150   (80w/chan main, 25w center, 25w rear)
                                                        ||||||||

  The DSP-A1000 is a seven channels integrated av amplifier w/
80w/chan main, 80w/chan center, 25w/chan rear, 25w/chan front effects.
23 different modes (including 70mm action, Village Gate Club, church, etc..)
There is also a test tone generator for adjusting speaker levels.  An
important feature is the graphics equalizer for the front speaker.  This
allows you to match your center speaker to your left and right main speakers.
I find it quite handy that all these adjustments can be made with the
remote, and thus from your listening position.
  Other features include universal remote, s-vhs inputs for all video
inputs along w/ normal composite via rca jack video input.  There are
5 video inputs (ld, tv, vcr1 -- output also, vcr2 -- output also
  aux -- in front pannel)
5 audio inputs/output (tape 1, tape 2, tuner, cd, phono)


If you have any questions, feel free to contact me.


-Thai Pham
st403383@brownvm.brown.edu
Newsgroups: rec.audio
From: serge@dgbt.doc.ca (Serge Ah Hee)
Subject: Re: Where can I find the Nyquest theorem
Organization: The Communications Research Centre
Date: Tue, 1 Sep 92 17:26:06 GMT

In article <1992Aug31.114555.17504@discus.technion.ac.il> sorin@techunix.technion.ac.il (Goldenberg Sorin) writes:
>Question
>A signal say x(t) is bandlimited to W hz.
>I produce a signal x'(t) by multiplying the original signal x(t) by 0 at
>times i/2/W. x'(t)'s spectrum is the same as x(t) s. Then I sample x'(t) at time i/W/2, so I get a sampling frequency of 2W. All the samples will be 0, so I can't construct x'(t) from it's samples. What went wrong ?

Multiplying x(t) by 0 at every i/(2w) will create dicontinuities.
The result is also the same as x'(t)=x(t)-Dirac(t-i/2/W)*x(t).
Therefore x'(t) does not have the same spectrum as x(t).
These dicontinuities are created by a trail of impulses. 
Therefore, x'(t) does not have the same BW as x(t)
:
-- 
Serge Ah-Hee                  "Most troubles come from the fact that people 
serge@dgbt.doc.ca		take for granted of what they have, and 
				only care for what they want."
My opinions are mine only.
From: michi@ptcburp.ptcbu.oz.au (Michael Henning)
Newsgroups: rec.audio
Subject: Re: Where can I find the Nyquest theorem
Date: 25 Aug 92 23:44:52 GMT
Organization: Pyramid Technology Corporation

dave@news.ccutah.edu (dave martin) writes:

>Where can I find the exact statement of the Nyquest theorem?  I have seen
>some articles attributing certain properties of digital audio to the Nyquest
>theorem which happen to be false.  I am trying to find out if the theorem
>is in error (unlikely) or if the author of the piece I read is wrong (more
>likely).

Here it is:

If a signal contains V discrete levels, and runs through a low-pass filter
of bandwidth H, the maximum data rate is

	max = 2H log V bits/sec		(the log is base 2)

In other words, the filtered signal can be reconstructed by making only
2H (exact) samples per second.

Example: a noseless 3kHz channel cannot transmit binary (two-level) signals at
a rate exceeding 6000 bits/sec.

This is taken from A. Tanenbaum "Computer Networks", Prentice Hall.


							Michi.
-- 
      -m------- Michael Henning                 +61 75 950255
    ---mmm----- Pyramid Technology              +61 75 722475 FAX
  -----mmmmm--- Research Park, Bond University  michi@ptcburp.ptcbu.oz.au
-------mmmmmmm- Gold Coast, Q 4229, AUSTRALIA   uunet!munnari!ptcburp.oz!michi
Newsgroups: rec.audio,misc.consumers
From: dap@portal.vpharm.com (David A. Pearlman)
Subject: Re: DAK mail order
Keywords: dak mail order safe 
Organization: Vertex Pharmaceuticals, Inc.
Date: Tue, 25 Aug 1992 23:33:32 GMT

In article <1992Aug25.134634.5639%jim.uucp@wupost.wustl.edu> mike%jim.uucp@wupost.wustl.edu (Mike Suter) writes:
>I am considering buying a DAK subwoofer, but obviously now may
>not be the perfect time as they are operating in chapter 11.
>
>Has anyone ordered from them since they filed?  Anyone have any
>idea when/if they might come out of Chapter 11?
>
>Thanks for your help

The last I heard, things were moving along sllloowwwly (this from 
a friend whose sister works/worked for them). From what I hear, their
downfall was brought about by their foray into private label computer
sales. Apparently they have a fortune (before depreciation) in outdated
no-name computers.


dap

-- 
=============================================================================
    David A. Pearlman

Vertex Pharmaceuticals Inc.                     email: dap@vpharm.com
From: hans@sun.se (Hans J. Albertsson - Sun Sweden)
Newsgroups: rec.audio
Subject: Re: Green Pens & CDs (was Re: Very expensive cables)
Date: 4 Sep 92 11:54:19 GMT
Reply-To: hans@Sweden.Sun.COM
Organization: Sun Microsystems AB, Sweden

In article <1992Sep3.180204.12249@wdl.loral.com> trw@spl1.spl.loral.com (Tim R Witort) writes:
>In article <JEFF.92Sep3085130@dsp.sps.mot.com>, jeff@dsp.sps.mot.com (Jeff Enderwick) writes:
>|> what is a "green pen" for a CD ?
>
>  Well, no smiley on the end, so I'll assume you're serious...
>
>  Some people claim that drawing lines on the non-label side of
>their CDs with a green marking pen make the CDs sound better.
>
>-- Tim


No no no!

What people DO claim is that it makes an audible difference to
paint the inner and outer edges of a CD with green. They further claim
that the cheaper the CD player, the greater the difference.

One experiment, performed by a Swedish audio mag, indicated that the
reason might be disturbances from the laser pickup steering
electronics getting into the audio portions thru the power supply.
They added extra power supplies to an existing CD player, until more
or less everything had its own supply. Then the diferences
disappeared. Painting seemed to damp out reflections from the CD
edges.

If the above IS true, then one can conclude that drawing on the
non-label side will disturb the laser beam, and make the sound
worse.

As an aside, you can change the sound of a CD by drilling holes thru it,
too, since you'll tax the ECC mechanisms harder, finally
making the noise/distorsion worse. ( Of course, if you drill a large
enough whole in the wrong place, the CD will become unplayable...)


Hans J. Albertsson, Sun Microsystems AB, Sweden.

P.S.	The latest tweak story is about CD records being magnetic
	and magnetized. Defluxing a CD supposedly is audible.
	The people performing that experiment seemed convinced
	they'd done the experiment right, and got a result,
	with the same correlation with player quality as above.
	I can't think of an explanation, though. Unless
	it's the label inks that have reflectances affected by
	magnetization.
	
	The REAL lesson from all of the above is that

			QUALITY MATTERS!

	I.e. NO cheating is allowed anywhere in any audio design.
	
P.P.S.  The only craziness involved in the green-CD thing concerns
	people who seek ANY change, since they're perpetually
	dissatisfied with anything they already have. ( The grass is
	always scorched brown on their side of the fence... )
From: kw1z+@andrew.cmu.edu (Kurt Nathaniel White)
Newsgroups: rec.audio
Subject: WANTED:Adcom GFA-555 with 19" rack mounts
Date: 4 Sep 92 01:45:28 GMT
Organization: Junior, Drama, Carnegie Mellon, Pittsburgh, PA

I am looking for a GFA-555 with rack mounts to add to my sytem.  It must have
rack mounts in order to be of any value to me. If you know anyone that
has one I
would like to make them an offer. Thanks

kurt

kw1z@andrew.cmu.edu

412-268-5508
From: ar12@quads.uchicago.edu (Richard Nixon)
Newsgroups: rec.audio
Subject: ADCOM 545II for sale
Date: 2 Sep 92 14:56:53 GMT
Reply-To: ar12@midway.uchicago.edu
Organization: University of Chicago Computing Organizations

For sale:
 
ADCOM 545 II  100WPC stereo amplifier
Less than 1 yr old, mint conditio with original packaging & docs.
 
$300 + shipping
 
Andre
Newsgroups: rec.audio
From: isclyhb@nuscc.nus.sg (Benjamin Lian)
Subject: How to cure mains leakage?
Organization: National University of Singapore
Date: Wed, 26 Aug 1992 07:31:00 GMT

I have a bunch of hifi gear, a keyboard, and a rack full of sound
modules and stuff running of the same mains outlet (via powerboards of
course).  Most (if not all) of the equipment is not earthed.  I suspect
that this is causing low-level leakage of some a.c. to all the chassis.
As a result I have to move very gingerly around the equipment otherwise
I get zapped if I touch anything live.  There is not much to worry about,
but enough so that it is not pleasant.

Would some kind soul *please* *PLEASE* tell me how to stop my audio gear
from behaving like a cattle prod.

Thanks in advance,

Ben Lian
isclyhb@nuscc.nus.sg
From: fkrauthe@vlsilab.ece.uc.edu (Frank John Krautheim)
Newsgroups: rec.audio
Subject: Shoppers Advantage on CompuServe
Date: 3 Sep 92 03:29:51 GMT
Article-I.D.: babbage.1992Sep3.032951.18753
Organization: Unversity of Cincinnati, ECE Dept

Oh no, another is this mail order place any good.

Anyway, has anyone used the shoppers advantage club on Compuserve?
They have really good prices (competive with 6th Ave.) on Denon,
Pioneer, Hafler, Onkyo, Adcom, etc.  No Yamaha (bummer no DSP-A1000).
They have full factory warranty and will extend short warranty's
to 2 years.  

I am considering purchasing the new Denon AVC-3030 from them.  This
is a nice unit with 110 l/c/r and 35 r, DSP unit, loads of in/outputs,
and a exceptional price of $950 including shipping/handling and tax.

Just wondering if anyone has used this and what your experiences were.
And all you modemers out there might check it out for great prices and
a good warranty.

John

--
			      ______________		   _
                              )_____________)     ________/ \________
   John Krautheim                       \\       (________   ________)	
				         \\         /   / \_/
   fkrauthe@thor.ece.uc.edu               \\_______/  _/ There's no intelligent 
   University of Cincinnati		 _/ ..  ...    \  life down here.
   Department of Computer Engineering    \_____________/   Beam me up Scotty.
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: CD(LD) digital output to DSP pre-amp
Date: 3 Sep 92 00:27:50 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA
Originator: daemon@sword.eng.pyramid.com

In article <1992Sep2.181528.27959@jarvis.csri.toronto.edu> smith@eecg.toronto.edu (Michael B. Smith) writes:
>
>The big question is, do any Pro-Logic/DSP systems use digital cable/fiber
>inputs instead of analog? 

   The Sony TA1000-ESD has fiber and coax digital inputs.  It's been
   replaced by the TA2000ESD.  Supports 32, 44.1 and 48 Khz inputs.

   Both are digitally implemented preamps...tone controls (actually
   parametric EQ), volume, surround decoding, and DSP are all done
   in the digital realm.