HDTenEightyP/NetNews huggingface dataset:
From: hsu@ecf.toronto.edu (HSU TITUS HENG-HSUEH)
Subject: Re: Questions on Digital Cable
Originator: tjk@csd4.csd.uwm.edu
Organization: University of Toronto, Engineering Computing Facility
Date: Mon, 31 Aug 1992 13:13:32 GMT

In article <25AUG199200151523@zeus.tamu.edu> p0p4018@zeus.tamu.edu (PREMTHAMKORN, PRAKIT) writes:
>I have a few questions on digital cable.  Hope someone can help.
>
>1) What are differences between ordinary interconnects and cable for digital 
>data transmission?
>
The digital cable are designed to handle high frequency data stream without
introducing any unwanted jitter in the data stream.  Those are the only
criteriums for the digital cables.  It was said before that the Audio Quest
video Z (a video interconnect) was the best sounding digital interconnect
once upon a time.

>2) What does it mean by "75 ohms coaxial cable"?
>
Co-axial means the signal wiring and the ground wiring are both centred
about the same axis.  Most interconnects are co-ax. 75 ohms is just its
average reactive impedance reading.  I wouldn't worry about it that much.


>3)  Can I use ordinary cable as digital cable?  If not, why?
>
You certainly can use normal interconnects as digital cables, but it will
sound substantially inferior.  Go get yourself a copy of the Chesky Jazz
Sampler and Test Disc Vol.II.  It has a very elaborate comparison among
normal interconnects and digital cables serving as digital interconnects



Newsgroups: rec.audio.high-end
From: neidorff@uicc.com (Bob Neidorff)
Subject: Re: Replacing Fuses
Originator: tjk@csd4.csd.uwm.edu
Organization: Unitrode Integrated Circuits Corp., Merrimack, NH
Date: Thu, 3 Sep 1992 13:07:39 GMT


Thomas Krueger is at least 90% correct in his latest posting, where
he warns against putting larger fuses in and recommends cleaning
fuse ends.  He gives good advice, and you won't go wrong following it.
I just want to add a few more thoughts.

One is that anyone who depends on a fuse to protect his speaker is
on African Safari in a bikini without a guide.  Delicate speakers
almost always protect rugged fuses by blowing first.

The other thought is that fuse wire has a temperature dependent
resistance.  I don't know if it is audible or how much it is audible,
but I believe that you are much more likely to hear the difference
between fuse and no fuse in a speaker line than you are likely to hear
the difference between 3 meters of 18 gage lamp cord and 3 meters of 
big-buck speaker cable.

For power line fuses, FOLLOW MANUFACTURER'S RECOMMENDATIONS.
-- 
Bob Neidorff; Unitrode I. C. Corp.  |  Internet: neidorff@uicc.com
7 Continental Blvd.                 |  Voice   : (US) 603-424-2410
Merrimack, NH  03054-0399 USA       |  FAX     : (US) 603-424-3460

Newsgroups: rec.audio.high-end
From: rust@rs049.intel.com (Camron Rust)
Subject: Re: What ever happened with Stereophile?
Originator: tjk@csd4.csd.uwm.edu
Organization: Intel Corporation, Beaverton, OR
Date: Thu, 3 Sep 1992 13:01:15 GMT

What I remember is stereophile reccommending it (armor-all) for use
on CDs not LPs. If they did suggest it for LPs it was many years ago.
Someone else may have suggested for LPs in the past few years but it
was not stereophile. It has however been reported that some people have
experienced problems after treating their CDs with armor-all but not
everyone nor near everyone. I for one have never put anything on my
CD except for a soft cloth to clean 1 or 2 occasionally.
--
Camron Rust		rust@scic.intel.com
Intel Corporation	Supercomputer Interconnect Components Group
503-531-5040

Newsgroups: rec.audio.high-end
From: Giorgio Marinangeli <ZEPHYR2@IBGUNIV.BITNET>
Subject: Suggested hi-fi shops in New York
Originator: tjk@csd4.csd.uwm.edu
Content-Transfer-Encoding: 7BIT
Organization: University of Wisconsin - Milwaukee
Date: Thu, 3 Sep 1992 13:08:28 GMT
 <01GOCN983L8GA3CAE0@icil64.cilea.it>; Thu, 3 Sep 1992 14: 24:57 +01

 
Hi all,
 
I am going to be in New York City for a few weeks, and I am looking
for some good hi-fi/audio/electronics dealers in Manhattan area.
 
If you could supply name, address and any info about them (reliability,
prices, guarantee and so on), I would be greatly appreciative.
 
Thank you very much in advance.
 
 
----------------------------------------------------
   iiiiiiii          Giorgio Marinangeli
  iiiiiiiiii         Universita' di Bergamo
      iiii           Centro di Calcolo
   i   iiii          Piazza Rosate n. 2
  iii   iiii         24100 Bergamo - Italy
  iii     iiii
          ii ii
   iiiii ii          E-mail: ZEPHYR2@IBGUNIV.BITNET
    iii
----------------------------------------------------

Newsgroups: rec.audio.high-end
From: schippit@seviche.ycc.yale.edu (Mark G. Schippits)
Subject: FOR SALE: Carver H9AV Sonic Holography
Followup-To: rec.audio.high-end
Originator: tjk@csd4.csd.uwm.edu
Organization: Yale Medical Informatics
Date: Wed, 26 Aug 1992 13:06:39 GMT

NEW, HAVE BOX AND OWNERS MANUAL AND ORIGINAL PACKING
PERFECT WORKING ORDER AND PHYSICAL CONDITION

Send quick mail or E-mail if you have questions.

List is well over $200

I'd be satisfied with $100

IT's a great deal and a neat piece of equipment

To help broaden your soundstage without extra speakers hanging around

Feel free to call me during the day at (203) 785-7443


mark_schippits@qm.ycc.yale.edu

Newsgroups: rec.audio.high-end
From: jas@proteon.com (John A. Shriver)
Subject: Studio monitors/history of turntables
Originator: tjk@csd4.csd.uwm.edu
Cc: ytl@philabs.philips.com
Organization: University of Wisconsin - Milwaukee
Date: Wed, 26 Aug 1992 13:06:55 GMT

The studio we're doing some recording at has the obligatory JBL and
Yamaha NS10 speakers.  They know that the NS10's are tonally dreadful.
They are there to be "the crap the typical customer listens on".
We've been doing mixdown recently, and we make sure that the balance
still makes reasonable sense on the NS10, although much is lost in
comparison to the JBL.  We are not equalizing it to sound flat on the
NS10.  (Hell, the vocals are running flat.)  It's a matter of being
sure that the relative levels of the tracks sound reasonable on a good
speaker and a bad one.

Not that the JBL is flat either.  When we were choosing the vocal
microphone, I bought in my old LS-3/5A's, which made both speakers
seem very colored.  (However, the Yamaha "studio" power amp was
obviously rather unhappy about the nasty load of the LS-3/5A, it was
spitting somewhat.)

One real advantage of the Yamaha NS10's comes when you are listening
for flubs.  They are very bright and articulate in the mid frequencies
where vocals, guitar tracks, etc., are.  The engineer is very good at
using them to listen for flubs, so that you can know if you need
another take.  This is a very important capability.

Of course, the final approval will come by checking a dub of the
mixdown master on the home system, through Thiel CS2's with tube
amplification. 

(Of course, we've also played the dub on a $50 boom box.  That was
OK, too.)

Newsgroups: rec.audio.high-end
From: jas@proteon.com (John A. Shriver)
Subject: house grounding 
Originator: tjk@csd4.csd.uwm.edu
Organization: University of Wisconsin - Milwaukee
Date: Thu, 3 Sep 1992 12:59:14 GMT

Aside from which, your house almost certainly already has a ground
stake.  Well, most likely a ground pipe.  The cold water pipe coming
into your house.  In my house (and per the National Electric Code),
there is a substantial (8 guage?) bonding wire between the neutral bus
of the breaker panel and the water pipe entering the house.

I suppose one could legally (within the NEC) have that bonding wire
made larger.  That would cut the bounce of the ground due to
imbalanced neutral current.  The size of the holes in the netral bus
bar could pose a size limit, however.

I suppose one way to beat all the neutral noise and imbalance would be
to put in a 220V outlet (hot-to-hot), and use 220V power amplifiers.
That's going to halve the current drawn for a given power.  It's
getting to the point where some of the high end Class A amps draw so
much current that they almost have to be 220V.  (If it looks like a
space heater, and feels like a space heater...)

(By the way, I looked at a catalog, and hospital grade outlets come
with and without isolated ground.)


Newsgroups: rec.audio.high-end
From: Ed Faulkner <faulkner@beta.tricity.wsu.edu>
Subject: old equipment-new sound
Content-Type: TEXT/PLAIN; charset=US-ASCII
Originator: tjk@csd4.csd.uwm.edu
Organization: University of Wisconsin - Milwaukee
Mime-Version: 1.0
Date: Fri, 4 Sep 1992 14:06:56 GMT

I recently aquired some older tube amplifiers and have been refining the
circuit as much as "I" can, removing the feedback loop made a tremendous
improvement in the overall presentation, many cloaked nuances are now
clearly defined even from CD. I have rediscovered my entire record
collection!


After reading the recent posts on line conditioning and other methods for
improving sound I noticed a constant voltage isolation transformer in a
surplus yard and took home to try in my system. The improvement was amazing, a
much more focused soundstage and far less grain, vocals are more natural
without the compressed character evident when the transformer is removed. 
Living in a rural area, and having my own transformer from the
transmission line, led me to belive that the power source was fairly clean
but my ears are telling me differently.
 

Can anyone help me find data manuals for tubes, I have not been able to
find a local source.
From: bill@verdix.com (William Spencer)
Newsgroups: rec.audio.high-end
Subject: Re: Driving ELS Directly
Date: 4 Sep 92 14:08:12 GMT
Organization: Verdix Corp.
Originator: tjk@csd4.csd.uwm.edu

I can suggest a few possibilities that might be better than either driving ESLs
from a standard amp or directly at almost impractically high voltages. Thing to
do is avoid the two seperate transformers used when a conventional tube amp is
used to drive the ESL:

1. Use a step-up transformer with a higher input impedance. Especially good for
   tube OTL amps.

2. Design the step-up as an integral part of a tube amp. This allows the
standard center tapped, balanced primary transformer be used, unlike OTL
and direct drive setups. 

With either of these, negative feedback can be taken from the stepped up 
signal or a tertiary winding of the step-up.

Bill s
Verdix corp
Chantilly, VA
----------------------
Please reply by email or cc: me if you follow up as I may temporarily lose news
access very soon.
Newsgroups: rec.audio.high-end
From: scott@psy.uwa.oz.au (Scott Fisher)
Subject: Re: Studio monitors/history of turntables
Originator: tjk@csd4.csd.uwm.edu
Organization: University of Western Australia
Date: Fri, 28 Aug 1992 13:03:38 GMT

chrisc@gold.gvg.tek.com (Chris Christensen) writes:

[interesting stuff deleted...]

>NS10's!

>I believe that the popularity of the NS10's was initally based on the
>mystic and esoteric nature of the recording engineer.  If one produced
>did a string of hits using the NS10 with tissue paper over the tweeter
>then *everybody* can....

You seem to forget one other factor...PRICE...for the cost of 1 pair
of "esoteric" studio monitors you can get 20 pairs of NS10's.  They
were/are so cheap everyone can afford them so...why not?

When I was setting up my home studio the first thing I thought of buying for
monitoring was a set of NS10s because "everybody" had/has them and they
so cheap it would not preclude me form getting "better" monitors
later or indeed at the same time.  
_______________________________________________________________________________
Scott Fisher [scott@psy.uwa.oz.au]  PH: Aus [61] Perth (09) Local (380 3272).                
                                                             _--_|\       N
Department of Psychology                                    /      \    W + E
University of Western Australia.                 Perth -->  *_.--._/      S
Nedlands, 6009.  PERTH, W.A.                                      v       

Joy is a Jaguar XJ-6 with a flat battery, a blown oil seal and an unsympathetic wife, 9km outside of a small remote town, 3:15am on a cold wet winters morning.
-------------------------------------------------------------------------------
From: bbs.hew@tsoft.sf-bay.org (Harold Wheaton)
Subject: Re: How are speaker impedences specified?
Organization: The TSoft BBS and Public Access Unix, +1 415 969 8238
Date: Tue, 1 Sep 1992 04:48:31 GMT

lauson@en.ecn.purdue.edu (Patrick W Lauson) writes:

> >No.  I'm not sure how nominal impedance is specified, probably just by what
> >it seems like they could get away with calling it.
> >Vandersteens (2Ci) are nominally 7 ohm, but get down to 4.
> >My Infinitys (Ref-3, anyone want to buy a pair?) are nominally 6 ohm, and
> >I've measured them down to 4 - they possibly go even lower, since they
> >seem to present a nasty load to my amp, wher Vandersteens do not.
> Most companies rate their speakers at either 4 or 8 ohms. An 8 ohm speaker
> usually reads about 6 ohms DCR, and will have a minimum impedance of
> about 6.5 ohms or so....  Its a messed up system, but not nearly as messed
> up as the way some companies do their power ratings (ahem.....ADVENT).

Hmmm...talk about some real confusion!  I was hoping it would be 
"scientific" but maybe not!  Anyway, I suspect my surplus speakers are 4 
ohmers (3.8 at DC, 8 at 1 Khz, 2 at 20 Khz!) and I know I can put a 4 ohm 
resistor in series and that should make the receiver happy since it likes 
8 (but can handle 6).

Thanks all for the help.  I am ready to get the receiver knowing things 
should work out.
                        -Harold

--
Harold Wheaton (bbs.hew@tsoft.sf-bay.org)
From: johnr@tvnews.tv.tek.com (John Reynolds)
Newsgroups: rec.audio
Subject: Re: Where can I find the Nyquest theorem
Date: 26 Aug 92 21:14:11 GMT
Organization: Tektronix TV Measurement Systems, Beaverton, OR

>In article <1992Aug25.200552.12909@fcom.cc.utah.edu> 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).
> 
> dave@csulx.weber.edu
> DMARTIN@CC.WEBER.EDU

I asked a related question on the net a couple years ago and got some good
pointers.  First of all, a minor nit:  the correct spelling is Nyquist.

Harry Nyquist was born February 7, 1889 and died April 4, 1976.  He was a
Swedish immigrant who recieved a PhD in physics from Yale in 1917 and spent
essentially the rest of his life working for A.T.& T. and/or Bell Labs.

The so-called Nyquist Theorem was first discussed, in the context we think
of it to day, in a paper by Claude Shannon in 1949:

Claude E. Shannon, 1949, "Communication in the Presence of Noise,"
Proceedings of the I.R.E., Vol. 37, no. 1, January 1949, pp 10-21.

In this paper, Shannon says,

"THEOREM 1: If a function f(t) contains no frequencies higher than W cps,
it is completely determined by giving its ordinates at a series of points
spaced 1/2W seconds apart."

Shannon then goes on to demonstrate with a mathematical proof that this
statement is not only approximately, but exactly true.

Shannon references two paper by Nyquist:

Harry Nyquist, April 1924, "Certain Factors Affecting Telegraph Speed,"
Bell System Technical Journal, Vol. 3, p. 324.

Harry Nyquist, April 1928, "Certain Topics in Telegraph Transmission
Theory," A.I.E.E. Transactions, Vol. 47, p. 617.


Hope this helps,

John Reynolds
Tektronix TV Division
Beaverton, OR
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: HELP: what satellite system should I buy?
Date: 4 Sep 92 00:56:56 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA
Originator: daemon@sword.eng.pyramid.com

>In article <1992Sep3.095318.3882@desire.wright.edu>, ejones@desire.wright.edu writes:
>|> of one of the many satellite/subwoofer systems. I have only heard one
>|> such setup and that was the Bose am5 and am7 systems. Nice, but 
>|> pricy. I have seen several people here mention Cambridge Soundworks
>|> Ensemble II. Where would I call/write to get info about these speakers?
>|> Are there any other great sounding speakers in this price range? ( <$500)

In article <1992Sep3.203716.9151@nas.nasa.gov> fineberg@nas.nasa.gov writes:
>I think this should read "Are there any great sounding speakers in this price
>range? ( <$500)", and the answer is of course no! (unless if you mean $500 each).
>If you really want to upgrade your system piecewise, spend more on your speakers.
    Alternatively, are there any satisfying systems in this
    range....the answer is yes.

    The original "poor student" will hopefully ignore the audio
    snobs who insist on mortgaging your future earnings for your
    starter system.

    You may also want to check out the little Polk sat/sub system.
    Some dealers are offering discounts on it in this area.   

    And if you get filthy rich in the future, you can always use it
    for DSP effect and surround sound.  

    And yes, the RS receiver will drive it...         
Newsgroups: rec.audio
From: rolfe@fraser.sfu.ca (Christopher John Rolfe)
Subject: Wireless Speakers?
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Fri, 4 Sep 1992 20:08:23 GMT


	I'm looking for recommendations/pointers/comments on wireless speaker
systems.  Desired features include:
	ability to handle 3-4 remote stereo pairs;
	local volume control;
	master select ( i.e. on/off for A,B,C,D, etc. pairs );
	ability to match to different speaker types (indoor,outdoor).
Info needed:
	price, availablity, pros/cons, RF interference susceptibility,
and anything else pertinent.

E-mail and I'll summarize, etc., etc.

Thanks in advance

-- 
Chris                   | 2617 East 4th,| The only space left in the Western
rolfe@sfu.ca            | Van., B.C.    | World that doesn't say 'McPizza'.
Simon Fraser University | V5M 1K5       | (reg.trdmk). 
Burnaby,  Canada        | Canada        |
From: bng@tropel.gca.com (Baldwin Ng)
Newsgroups: rec.audio
Subject: *** SPEAKER WIRES ***
Date: 4 Sep 1992 16:04:23 -0500
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu

Hello,

I just got a system a few months ago, Kenwood UD-?? (forgot exact
model no).  My friend suggested me to get my own speaker wires.
How should I choose the kind to match my speakers' output?

Your replies are greatly appreciated.  Please send to:

ng@moe.optics.rochester.edu  OR  bng@tropel.gca.com

Baldwin Ng
*****************************************************************
* Siu-yan Baldwin NG (MS Optics '93, Co-op Student at GCA Tropel)
		Email:	bng@tropel.gca.com
			ng@moe.optics.rochester.edu
-----------------------------------------------------------------
	Phone:	716-388-3439 [Office: 8am-5pm] - GCA Tropel
		716-473-2902 [Home: after 8pm]
-----------------------------------------------------------------
*** My ideas/opinions are mine and only mine, not related *******
*** to my company! **********************************************
*****************************************************************
Newsgroups: rec.audio
From: clarke@acme.ucf.edu (Thomas Clarke)
Subject: Re: Where can I find the Nyquest theorem
Organization: University of Central Florida
Date: Wed, 26 Aug 1992 15:16:48 GMT

In article <1992Aug25.234452.4677@ptcburp.ptcbu.oz.au>  
michi@ptcburp.ptcbu.oz.au (Michael Henning) writes:
> 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.
> 
Your equation is part of Shannon's information theory; it depends
for its proof on the sampling or Nyquist theorem, which is: 

"Given a band-limited signal f(t) containing no frequency components
beyond F, f(t) may be recovered completely from the infinite
sequence of impulse samples f*(t) seperated by time intervals
no greater than 1/(2F)." 
[V.W. Eveleigh, Intro to Control Systems Design, McGraw Hill, 1972, p412]
(original used omega rather than F, but no ASCII pi) 

There is a bit of a paradox involved in this, however.  Complex
variable theory shows that no band-limited signal can be time limited.
[Band limited signals are analytic, an analytic signal zero on
an interval must be zero everywhere]
That is, the band limited signal is essentially infinite in duration,
so the phrase "infinite sequence" in the theorem is not just 
flowery verbiage.  

A a result, since all musical performances are finite, 
the Nyquist theorem can never be completely satisfied, so
that digital sampling must be somehow imperfect.
Perhaps this is the source of the difference between 
CDs and LPs :-)

--
Thomas Clarke
Institute for Simulation and Training, University of Central FL
12424 Research Parkway, Suite 300, Orlando, FL 32826
(407)658-5030, FAX: (407)658-5059, clarke@acme.ucf.edu
Newsgroups: rec.audio
From: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
Subject: Re: Bose AM-7
Reply-To: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
Organization: NASA/Goddard Space Flight Center
Date: Thu, 3 Sep 1992 12:14:35 GMT

Shiv Swarup Pathak <sp3u+@andrew.cmu.edu> writes:


>I am YET ANOTHER VERY HAPPY customer of Cambridge Soundworks.  Except I
>bout the $499 original Ensemble.
>               With the two subwoofers, you can arrange them in your
>room to suit your personal listening preferences.  Just depending on
>placement the bass could be subtle or monsterously thumping (but always
>tight and clean).

I would hardly call "monsterously thumping" bass "tight and clean"...
-- 
    Jim Jagielski               | "This is supposed to be a happy occasion.
    jim@jagubox.gsfc.nasa.gov   |  Let's not bicker and argue about who
    NASA/GSFC, Code 734.4       |  killed who."
    Greenbelt, MD 20771         |
From: billh@hplsla.hp.com (Bill Harris)
Date: Wed, 26 Aug 1992 20:34:21 GMT
Subject: Re: Sony walkman
Organization: HP Lake Stevens, WA
Newsgroups: rec.audio

We have had a D3 for several months now, so far with no complaints.  We
were looking for a small unit that would record reasonably well and that
would let one set volume levels (recording live classical music on units
that have an AGC on the input levels would seem to be a problem).  We also
wanted a fairly portable way of playing the recording back through a
speaker, and so we ended up with a set of powered Sony speakers.

It is also usable with our regular stereo system, obviously.

We also looked at the D6, but we didn't want to spend the extra money (more
like $200 more, as I recall, if you have to buy the microphone).

Bill Harris
billh@lsid.hp.com