HDTenEightyP/NetNews huggingface dataset:
From: stravis@boi.hp.com (Steve Travis)
Subject: OP-AMP EXPERIENCE
Date: Thu, 8 Oct 1992 05:07:30 GMT
Organization: Hewlett-Packard / Boise, Idaho
X-Newsreader: Tin 1.1.3 PL5



Some time ago, Dave Platt offered to make a group purchase
of a Burr-Brown op-amp, a OPA2604. I participated in this purchase
and thought I would share the results of the op-amp experiment
with the net. 

I have been playing with different op-amps for the last 3 months
so when the opportunity was presented to check out another one
I just had to take it. Not having any previous knowledge of the
OPA2604 I didn't know what to expect but the specs looked good,
25v/us, drive 600 ohm loads, and compensated for unity gain.
   
I have a simplistic pre-amp bread board setup where I first  
tried the op-amp. This is a non-inverting configuration, using
the OPA2604 as a unity gain buffer. The power supply was a +- 12V
using a huge xformer and caps which I have had laying around 
for some time. 

 |\             |\
_| \_____\<-----| \_______ out
 | /     /      | /
 |/      \      |/
         / 
         |        
        GND

The results were very nice. The sound was very detailed but
"smooth". I was very impressed by how easy the CD sounded.
I of course thought that it was just my own bias which was
showing but I did like the sound.

Then I opened my Onkyo CD player and discovered that the outputs
were being driven by the 5532 op-amp, which the OPA2604 is 
identical to in pinouts. Not being able to resist I replaced
the 5532 with a socket, a trick which I read about on the net,
to be able to do some ABA testing. The results were the same.
Very pleasant sounding, a definite improvement. The best 
adjective was still "smooth" but detailed.

I then took my CD to my brothers house who has simular model
Onkyo CD player and asked him to give an opinion. To my
surprise he said, "WoW, that sounds SMOOTH!". Unfortunately
his CD has different internals than mine and does not use
the 5532 so we could not upgrade his player. 

In Summary: The OPA2604 has very nice sonic qualities in my
circuits and a potential upgrade for any audio equipment using
the 5532 op-amp. At less than $2.50 each from the group
purchase it was a bargin to upgrade an inexpensive CD player.

My thanks to Dave Platt who made this possible.

Steve Travis
Newsgroups: rec.audio
From: agwiii@fang.att.com (Grayson Walker (660-7949)(12/92))
Subject: Re: Speaker recommendation 
Organization: AT&T Tax Systems Development, Maitland FL
Date: Wed, 14 Oct 1992 18:40:42 GMT


I don't know what you have or have not listened to, but before you part
with any of your money, listen to a pair of Klipschorns.  I have a pair
for my primary (front) pair and use the smaller Belle Klipsch for the
rear.  I searched and searched, couldn't find anything better so I bought
the Klipschs.

-- 
Grayson Walker                                           CHC, Maitland, Florida 
Forza!                                            Internet: agwiii@fang.att.com
Voice: 407 660 7949               ". . . big brown river . . ." Tuli Kupferberg
Newsgroups: rec.audio
From: fogarty@erenj.com (Ben Fogarty)
Subject: Please recommend a good subwoofer
Followup-To: rec.audio
Organization: Exxon Research and Engineering, New Jersey
Date: Thu, 8 Oct 1992 20:15:35 GMT

I would like to add a pair of subwoofers to my home system.
I currently have a pioneer tuner/amp and a pair of cirwyn vega speakers.
I have seen the CV subwoofers advertised but do not know if they are
decent quality. I would appreciate any advice on subwoofers and where
to buy them at a reasonable cost. Thanks for your help.

Ben Fogarty - Senior Staff Analyst
ER&E Computing and Telecom Support Division
fogarty@erenj.com
Xref: sparky rec.audio:13676 rec.music.newage:3485 rec.music.industrial:11743 rec.music.classical:14156 phl.music:164
From: arthur_noguerola@vos.stratus.com
Newsgroups: rec.audio,rec.music.newage,rec.music.industrial,rec.music.classical,phl.music
Subject: records for sale
Date: 13 Oct 92 10:11:29 GMT
Followup-To: rec.audio
Organization: Stratus Computer

lots of records for sale
contact arthur_noguerola@vos.stratus.com

_____________________________________________________
From: MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham)
Newsgroups: rec.audio
Subject: Re: Very expensive cables
Date: 13 Oct 92 23:32:12 GMT
Organization: La Trobe University
X-News-Reader: VMS NEWS 1.24

In <1992Oct13.114152.25877@edscom.demon.co.uk> rpt@edscom.demon.co.uk writes:

> My turn to throw some more petrol on the fire...
> 
> People who've tried to explain why cables make/don't make a difference to the
> sound of a hifi have concentrated on capacitance, inductance etc. I have 
> another suggestion. If you don't agree with me, please mail/post a reasoned
> explanation as to why I am wrong.
> 
> I know that a rusty piece of metal near a transmitting aerial can cause
> interference to nearby receivers. This happens because the rust acts like a
> semiconductor diode causing non-linearities that produce harmonics. If a
> length of cable carrying an audio signal contains impurities then maybe it
> effectively contains diodes that may cause distortion. Presumably, the
> manufacturers believe that oxygen free copper and crystalline structures
> avoid these effects.
> 
> Richard.
> -- 
> Richard Tomlinson, EDS Scicon, Wavendon Tower, Milton Keynes, UK MK17 8LX
> rpt@edscom.demon.co.uk   Tel:  +44 908 284539          Amateur radio: G4TGJ
> All opinions expressed are mine, and are not necessarily those of my employer.
Of course you are right. Rusty wire would be a bad interconnect!
The question is the level of impurities: If they are there to a significant
degree, I **would expect** they would be easily measured. Refering back to
Brendan Jones post of a while back, he didn't manage to measure them. So it 
comes to the same argument of whether the ear can detect an effect too subtle
to measure. That is not a debate I wish to be part of.
Yours,
Graham B
From: sudesh@utkal.njit.edu (T. J. Sudesh)
Newsgroups: rec.audio
Subject: Panasonic (PV 4210) 4 hd vcr fro sale!!
Date: 13 Oct 92 14:24:37 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.


	Hi,
   Panasonic 4 Head vcr for sale !!!
The model # PV-4210 (SAME AS PV4210 + COUNTER & PROGRAM DIRECTOR)
THE VCR IS LESS THAN 2 MONTHS OLD...
THE FEATURES ARE:

	1) AUTOMATIC DIGITAL TRACKING
	2) PROGRAM DIRECTOR (MAKES PROGRAMMING EASY)
	3) SVHS QUASI PLAY BACK (VHS RESOLUTION)
	4) BI LINGUAL (ENG/SPAN)
	5) 181-CH COMPATIBLE
	6) MULTI-EVENT PROGRAMMING
	7) THREE SPEED REC/PLAY
	8) GOT ALL THE FEATURES THAT NORMAL VCRS HAVE

		QOUTING A PRICE OF $170...

CALL SUDESH/E-MAIL, AT (201)596-8294 (9AM - 6PM)
	               (201)955-0143 (7PM - 11PM)
Newsgroups: rec.audio
From: strong@tc.fluke.COM (Norm Strong)
Subject: BA Sub/sat
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Distribution: na
Date: Tue, 13 Oct 1992 14:24:12 GMT

Has anyone heard the Boston Acoustics Sub/sat speaker system?  One of
the local audio stores is selling it out for $269.  

Is this a terrific deal--or what?  
-- 

Norm Strong  (strong@tc.fluke.com)
2528 31st S.   Seattle WA 98144   USA
Newsgroups: rec.audio
From: michaet@hubcap.clemson.edu (michael dale townsend)
Subject: Re: Regrets to this petty newsgroup
Keywords: none that I care to type
Organization: Clemson University
Date: Wed, 7 Oct 1992 17:53:46 GMT

jseiler@sei.cmu.edu (Joseph Seiler) writes:
>To any person who doesn't like what I've wrote... Fuck you and get a fuckin
>life. 

>jseiler@sei.cmu.edu (You see Ong-ulator,I not a pussy afraid to put their
>address down unlike you.)

>-(Native Pittsburgher)

 I think you should take your own advice.  I agree with your point that
this list tends toward the high-end, but obviously you didn't include
budget information in your request.  No matter what your opinions are,
you are carrying on like an immature child.  I too am a "poor
undergraduate" who listens to music on a portable "box."  However, I
realize that other people have more money than I, so I make sure I
mention price ranges before I ask for advice.  However, your reply was
unprofessonal, childish, and stupid.  I add my vote as a person who
dislikes what you wrote.  Grow up.

Michael Townsend      michaet@hubcap.clemson.edu

P.S.   I DO have a life.


Xref: sparky rec.audio:13489 rec.video:12111 misc.consumers:17571
From: vlad@ersys.edmonton.ab.ca (Vlad G. Pohnert)
Newsgroups: rec.audio,rec.video,misc.consumers
Subject: Re: Extended Warranties
Keywords: Electronic Wholesalers, Mitsubishi U57 VCR 
Date: Thu, 08 Oct 92 00:41:13 MDT
Organization: Edmonton Remote Systems #1, Edmonton, AB, Canada

- 
- I bough a canon camcorder with a 5 year ext warranty from Electroin Wholesale
- the Warranty people & they paid it (less shipping costs). The repair cost
- was more than the awrranty cost.
- 


I normally do not buy extended warrenties as well, but I did buy a 2 year 
extended warrenty on my SONY VHS 757 VCR ( I just had this feeling!) 
 
Just a few months to go and the machine developed a path error (Crunching 
bottom & top of the tape) It looks like they will be possibly replacing 
the WHOLE mechanism tray! I don't even want to think what the part would 
cost if I had to BUY it.... I paid about $80.00 for the extended warrenty 
which does seem to be reasonable for a VCR worth about $1300 CND$!!!
 
Vlad

< Vlad G. Pohnert                            >> a Zions greatest   >
< "BAKA no Baka" Fanzine Co-ordinator        >> Nightmare:         >
< Want a career in Anime?                    >> Madoka piloting    >
< Join Strike Force Baka and help kick butt! >> ZZZ Gundam Mk II!  >
From: smee@bristol.ac.uk (Paul Smee)
Newsgroups: rec.audio
Subject: Re: Audio exclusive speakers ? Comments ?
Date: 9 Oct 92 09:50:19 GMT
Reply-To: P.Smee@bristol.ac.uk (Paul Smee)
Organization: University of Bristol

In article <1992Oct8.180902.14822@bernina.ethz.ch> torda@igc.ethz.ch (Andrew Torda) writes:
>I think I expected better for this price and the salesman kept
>making comments about how this was a remarkable special offer,
>the bass was weak because of the floor and that the acoustics
>of the room were lousy.

I would be very suspicious of the 'hi-fi' credentials of any shop which
sold stuff in that price range, and used a demo area where they had to
apologise for the quality of the room.  I *might* consider forgiving
them if they will allow you to try them in your home BEFORE you commit
yourself to buying them.  In any case, I personally wouldn't spend that
much money on anything hifi if I hadn't managed to hear it AND be
personally impressed by it, regardless of what the salesbod might say.
Even if some people think they are great, remember, the important thing
for YOUR system is not whether 'some people' really like it, but whether
YOU like it.

-- 
Paul Smee, Computing Service, University of Bristol, Bristol BS8 1UD, UK
 P.Smee@bristol.ac.uk - ..!uunet!uknet!bsmail!p.smee - Tel +44 272 303132
From: uslave@mcl.ucsb.edu (Sir Prize!!!)
Newsgroups: rec.audio
Subject: Re: Power Amp requested
Date: 14 Oct 92 18:40:18 GMT
Distribution: na

In <Bw43p6.BK1@ssesco.com> nau@ssesco.com (William Nau) writes:

>Everything Grant said is true and I agree with him.  However a
>'downgrade' in power may be an upgrade in quality.  Get rid of
>an amplifier that  cares only about power (don't know the amp and
>this is just a possibility so no flames please) and get a more
>musical amp like a Bryston or PSE (trying to keep in the same
>price range here.  feel free to suggest better alternitives) at
>the sacrafice of power.  Not a bad idea.  It's what I'm considering 
>now with my 200wpc Denon.

>As long as I meantioned it, I'll take suggestions.  I've looked
>at Parasound, Bryston (too much $$$), Halfler, and B&K.  I would
>like something in the ballpark of 100wpc (give or take 50).

It might be a bit over your price range, but the Muse Model 100 is a really
good amp for the price.  They list at $1200, but I know a place that'll sell
it new for $900.

100wpc, BTW...


*        *      *     *     *    *   *  *  * * ** ** *** **** ****** *********
   Jesse Chang  (Sir Prize!!!)            INTERNET:  uslave@mcl.mcl.ucsb.edu *
   "-.-- -.-- --.." "Technology - high, on the leading edge of life."  -Rush *
*         *       *      *     *    *   *  *  * ** ** *** **** ****** ********
Newsgroups: rec.audio
From: price@linus.serum.kodak.com (Kevin Price (x37128))
Subject: Wanted: comments on JVC RX507 receiver, hints for low $ speakers
Reply-To: price@serum.kodak.com
Organization: Clinical Products Division, Eastman Kodak Company
Distribution: usa
Date: Tue, 13 Oct 1992 16:30:18 GMT


Hi,
	First and foremost, I'm on a strictly limited budget of $300 and
under.  So, with that in mind, does anyone have any comments on the JVC
RX507 receiver?  Can I get something better with comparable features for
the money?  It would cost about $275 with tax here.  Here's the stuff that
made me single it out:

	- Dolby surround (80W front, 20W rear)   There is a line out for
		the center pro logic channel which I would not plan to use
	- 7 band electronic graphic equalizer, 4 programmable contours plus
		4 more preset ones
	- jacks for 2 tape decks (this is a definite requirement)

	Next questions.  If I get it (or any other surround receiver),
does anyone have any guidelines on making speaker boxes for some
Alpine 6x9's?  Also, I've got an old hi-fi vcr which doesn't have an
MTS decoder.  Any suggestions on how I can receive surround broadcasts 
off cable (short of buying a new VCR, that is...).  Thanks for any help.


-- 
-Kevin Price		price@serum.kodak.com             
                                                          
 (please use the address above ^   The mailer may call me 
  nobody@kodak.com, but IMHO, I am not.)
Newsgroups: rec.audio
From: kma@eecg.toronto.edu (Kenneth L. Ma)
Subject: Inifinity SM-62 speakers
Keywords: Infinity
Date: 9 Oct 92 21:07:41 GMT

I just bought a pair of infinity SM-62 speakers but the owner's manual has
no spec. for it. Does anyone know how much power it can handle?  Any other
comment on the speakers also welcomed.  Thanks in advance.  Please email to me. 

Spec. I gather from Audio magazine:
freq. resp:     78-25kHz  +- 3dB
efficiency:     94dB
crossover freq: 5kHz
impedance:      8ohm
power handling: ??

ken

kma@eecg.toronto.edu
Newsgroups: rec.audio,rec.audio.pro
From: dpunjabi@eatdust.uswest.com (Dinesh Punjabi)
Subject: Need info on Sound Approach, Keifs mail order places ( please help )
Originator: dpunjabi@eatdust
Organization: U S WEST Communications -- Information Technologies
Distribution: usa
Date: Fri, 16 Oct 1992 14:54:15 GMT

I am planning to buy some audio equipment from either The Sound Approach, NJ
or Keifs, KS ... 

Your EMAIL responses about these mail order places will be highly appreciated.

Rgds

Dinesh
-- 
  Dinesh Punjabi                         e-mail: dpunjabi@eatdust.uswest.com
  USWEST Information Technologies        Phone: (303) 595-2901
  1475 Lawrence Suite 600     
  Denver, Colorado 80202
From: gfl@hera.uucp (22402-lenahan)
Subject: op-amp sound quality f(rail voltage)
Organization: Bellcore, Livingston, NJ
Date: Tue, 13 Oct 92 14:52:55 GMT

Recently Dave Platt and others tested BB 2604s against
5532s, etc for sound quality.  Has anyone done any
controlled  (or sort of controlled) testing of OP-AMPs,
particularly 2604s, for performance at different rail
voltages.  I'm getting mediocre results with 2604s
when used on a good quality existing +/- 5V supply.
I'm wondering whether its worth jumping this to
12V or 15V, or if the results will be marginal.

Comments?

Grant
gfl@hera.cc.bellcore.com
From: loj@cae.wisc.edu (Lo Jeffrey)
Newsgroups: rec.audio
Subject: Re: Portable cd player vs. new stereo
Date: 9 Oct 92 15:13:42 GMT
Organization: U of Wisconsin-Madison College of Engineering

In article <1992Oct8.195134.22341@scott.skidmore.edu> wwein@scott.skidmore.edu (warren wein) writes:
>
>	I just posted an article asking for suggestions on good
>portable disc players.  After flipping through Crutchfield's new
>catalog I'm wondering if I shouldn't just buy a new stereo.  As you
>may remember my home stereo consisted of a discman and AR's Powered
>Partners.  One of the speakers buzzes a little and the bass response
>is almost nonexistant.  If I got a new portable cd player I would want
>one with a radio.  There don't seem to be too many offered this way.

If you are getting lousy bass response out of Powered Partners, try wedging
them in a corner.  That's what I have done with mine.  The trick is to
find a happy medium between tradeoffs of bass response, muddiness, and
imaging.

By the way, (and I hope I don't get crucified by the purists) thumbtacks
make a good economical substitute for tiptoes for these particular
speakers.

Jeff Lo
loj@cae.wisc.edu
Xref: sparky rec.audio:13521 rec.video:12142 misc.consumers:17609
From: chus@troi.cc.rochester.edu (Chunwei Shih)
Newsgroups: rec.audio,rec.video,misc.consumers
Subject: Re: Extended Warranties
Keywords: Electronic Wholesalers, Mitsubishi U57 VCR
Date: 8 Oct 92 23:52:35 GMT
Article-I.D.: galileo.1992Oct8.235235.1959
Organization: University of Rochester (Rochester, NY)

For Sale:
Eico Model 666 dynamic conductance tube and transister tester. good
condition. size: 15"X12"X6". Asking $50/BO

If interested, please e-mail to "sshw@db1.cc.rochester.edu"
From: BARRON@RHQVM14.VNET.IBM.COM
Date: Fri, 16 Oct 92 07:33:43 EDT
Newsgroups: rec.audio
Subject: Optical v. Digital Interconnects
Reply-To: BARRON@RHQVM14.VNET.IBM.COM

A few questions/comments about this interconnect/clocking debate.

The fact that some transport-D/A combos use an external clock cable
indicates to me that the D/A does have some form of stable clock in
it.

If this is the case, why can't the D/A mfgs simply insert a FIFO
(which can be done many ways; we don't need unstable FIFO chips..I've heard
this argument).

With 1 sec or so of buffering, you should be able to absorb any clocking
instabilities in the transport.

Since everyone is in general accord that jitter is the problem and not a
high BER (bit error rate); this should put the high end digital
interconnect people out of business.  It would even open the door for
unshielded twisted pair interconnects (absent the RF generated for other
components to pick up on).

My other questions is, has anyone ever measured this jitter?

We are talking about a 1Mbps data stream.  By modern standards this
is DC.  Even with plastic fiber this is DC!   Granted, the transmitter
isn't a $5,000 laser as per some telecomm equipment, and the
light is in the visible spectrum (as opposed to IR); however, these
characteristics of the optical standard were chosen because of the
technically low end requirements for data xmission.

I firmly believe that there is a hearable (maybe not audible although)
difference between interconnects, my question is still why!  Additionally,
if jitter is the problem, why not insert a FIFO and be done with it.

Organization: Advantis Network Engineering and Planning
Disclaimer: This reflects the poster's views, not those of Advantis
News-Software: Usenet 3.0
X-X-From: Dave Barron
From: mkiss@eniac.seas.upenn.edu (mcKiss)
Newsgroups: rec.audio
Subject: need recommendations for amp/receiver, speakers
Date: 12 Oct 92 16:50:46 GMT
Organization: University of Pennsylvania


	I am looking to buy an amp/receiver and a good set of speakers in a
couple of months.  I would like to spend around $800-$1000 for this setup.
I've been looking at JVC, Sony, and Denon receivers, and Infinity and Advent
speakers.  Send any recommendations via E-mail.

						Thanks in advance,

						mkiss@eniac.seas.upenn.edu
P.S.  I would like to buy through mail
      order (cheaper), so if you have any 
      recommendations in that area they'd 
      be much appreciated.
From: ssyun@iso.ma.utexas.edu (Sung S. Yun)
Newsgroups: rec.audio
Subject: Where is FAQ
Summary: Where is FAQ
Keywords: FAQ
Date: 16 Oct 92 01:30:42 GMT
Distribution: rec
Organization: University of Texas at Austin Mathematics

+++++++++++++++++++++++++++++++

Hello?
I'd like to know if there is any FAQ file for this group.
Thanks.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

-- 

SungSik Yun---UT austin:Mathematics ||| E-mail:ssyun@math.utexas.edu
ph:(512)471-1242 (office)           |||        ssyun@cs.utexas.edu
From: mjs4@po.CWRU.Edu (M. J. Sanz)
Newsgroups: rec.audio
Subject: question:
Date: 12 Oct 1992 23:44:39 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: mjs4@po.CWRU.Edu (M. J. Sanz)
NNTP-Posting-Host: thor.ins.cwru.edu


I am interested in buying a CD player (No, I don't have one!!!), but I
have been putting it off because I've heard of a new digital tape that's
supposed to be coming out onto the market?
Does anyone know when  this will be out and whether it will be widely
used in markets (i.e. am I going to kick myself when it comes out and
everyone starts buying it?)

-- 
mjs4 on freenet OR
sanz@pix.uh.cwru.edu
i've spent two years thinking up new and interesting sig. files and now
i'm burned out. 
Newsgroups: rec.audio
From: davidric@uxa.cso.uiuc.edu (david ricardo)
Subject: Opinions on KEF Speakers?
Organization: University of Illinois at Urbana
Date: Fri, 9 Oct 1992 04:18:48 GMT

I am looking for some new speakers at about $1000 for the pair. I was
looking at a pair of KEF Q90s. These will be my first set of real
speakers and haven't had much experience listening great systems.

So I am looking for opinions on KEF and or a great pair of speakers
for $1000.

Where is the FAQ for this group which has suggestion like these?

			Ricardo 
			davidric@uxa.cso.uiuc.edu

-- 

| Ricardo David              RacerX Engineering              |
| University of Illinois          ...keep them mowing        |
| davidric@uxa.cso.uiuc.edu                 blades sharp ... | 
Newsgroups: rec.audio
From: image@leland.Stanford.EDU (John B. Mooney)
Subject: MAS MasTER CD MAT
Organization: DSG, Stanford University, CA 94305, USA
Date: Tue, 13 Oct 92 00:32:44 GMT


This sort-of goes hand-in-hand with the "Black rubber CD rings"
thread.

I recently purchased the MAS CD Mat (it was the $80 version, not the
$40 one.)  My first reactions were mixed.  Listening, I could tell
that somethings had definitely changed, but I couldn't immediately
characterize them as positive or negative changes.  I kept on using the mat,
however, for about a week.  I finally got sick of applying the Mat to
every CD and loaded a CD without the mat.  I was _really_ surprised.
Bass and soundstaging were the two most apparent changes.

I've been wondering, however, about the extra stress the mat maybe
exerting on the cd motor and the clamping mechanism.  I'm using a
California Audio Labs MkII CD player.  In the player manual, it states
that the clamping mechanism is unique in that it covers 1/3 of the surface
area of the cd -- thus eliminating the need for CD mats.
Occasionally, after loading the player, I can hear that the mat didn't
clamp well and must "re-mat" the CD.

Is it possible, or likely, to harm a CD player with external devices
such as CD mats?

Thanks,

-- John, image@leland.stanford.edu


Newsgroups: rec.audio