HDTenEightyP/NetNews huggingface dataset:
From: mbk@lyapunov.ucsd.edu (Matt Kennel)
Newsgroups: rec.audio
Subject: Re: Listening
Date: 14 Apr 1992 07:16:04 GMT
Organization: University of California, San Diego
NNTP-Posting-Host: lyapunov.ucsd.edu

jj@alice.att.com (jj) writes:
: (about booze testing)
: >Results like this show how
: >hard it is to use double-blind test results to draw conclusions about
: >the negative result.
: That's one interpretation, and I'm not sure I accept it.  As many
: people have proven, food tasting is very tough, and the chemical
: receptors prone to all sorts of saturation and memory effects.

I went wine tasting just last weekend with my dad.  I've never done it before
and didn't know that much about wine.  To me the differences between wines
made 2 miles from each other was far larger and more obvious (I.e. you
notice in 2-5 seconds, not 4 days) than that of almost all audio components,
excepting speakers.


: Vote for    *Copyright alice!jj 1992, all rights reserved, except transmission
: President 1992 *by USENET and like free facilities granted. Said permission is
: ___________________*granted only for complete copies that include this notice.
: Just Say !!!NO!!!       *Use on pay-for-read services specifically disallowed.

Matt Kennel
mbk@inls1.ucsd.edu
Newsgroups: rec.audio
From: mohan@yoko.rutgers.edu (Sunil Mohan)
Newsgroups: rec.audio
Subject: Re: NAD or Nakamichi
Date: 8 Apr 92 19:24:50 GMT
Distribution: na
Organization: Rutgers Univ., New Brunswick, N.J.

When I bought my last CD player, I took a pair of headphones to the
store, and listened to the CD players on display. And I was able to
distinguish between the different sounds, and picked one that I liked.
At that time, it was a Sony CDP 970.
_
Sunil
From: brunos@mafalda (Bruno  Schmidt)
Subject: Re: Walkman:  RECOMMENDATION
Organization: SOCS, McGill University, Montreal, Canada
Date: Fri, 10 Apr 1992 15:37:23 GMT

In article <1992Apr6.025557.15836@Princeton.EDU> kcdutt@ofkin.Princeton.EDU  
(Kevin C. Dutt) writes:
> I'm looking to purchase a new high-end walkman $150-$200 and was wondering
> if anyone had any suggestions.  First of all I seems that every walkman that
> I have bought quickly dies within the year (not abused).  I have decided to  
go  
> for quality instead of economy with this purchase.  Question: Aiwa v. Sony? , 
> How good is the DSP on some of the newer Aiwa's?Durability? blah blah blah...

	Well, I speak of durability, but I just got up the courage to buy a  
200$ walkman. I bought the aiwa HS-PX900. Its a very nice walkman, with casset  
only and no recording, but it has dolby B, C, and great sound. the earphones  
are quite good, but since they have a built in full function remote, changing  
them for others makes you lose some functionality(some people prefere the in  
ear type).

	Appart from good soun, the walkman has a couple of nice features. It  
can recharge the battery in 15 minutes(for 3 hours use) and 1 hour(for 3:1/2  
hours use). also, the fast forward, and rewind buttons, with always go forward  
or rewind, no mattter what side of the tape you are listening to(even if it is  
reversed).

	Anyways, I hope this helps, sorry I couldn't hel much about durability,  
but it is all metal and doeslook quite sturdy, also the rechargeable battery is  
internal(but removable).  I have had bad luck with the Sony sport(the more  
expensive one) and a small sharp walkman, I don't have much faith in these  
damned things lasting two long. Also, my father has an aiwa, which is about a  
year and a half old, and that one needed repairs also(it was a model with  
digital display, and 3 tone control

 		bye,             BS

	blah, blah, blah, blah,blah, blah, blah, blah,blah, blah, blah,  
blah,blah, blah, blah, blah,blah, blah, blah, blah,blah.
From: heilmayr@beirut.berkeley.edu (Klaus)
Newsgroups: rec.audio,rec.video
Subject: Re: CD rot
Date: 16 Apr 92 20:08:04 GMT
Article-I.D.: agate.skmr4INN6nc
Organization: U.C. Berkeley Logic Group
NNTP-Posting-Host: beirut.berkeley.edu

If I remember correctly, the fears about CD Rot were based on the very
real phenomenon of laser disc rot.  The explanation I heard of laser disc
rot was this:  A video laser disc essentially consists of two large CD's
(minus the label) glued together back-to-back.  In some of the early laser
discs, the glue had a tendency to give out after a while. This allowed
air to get in and oxidize the aluminum layer, which often made the disc
unplayable.  This was laser rot.  However, audio CD's are one-sided, so
no glue is involved in their manufacture, so there is no possibility
of "CD Rot."

-- 
-Klaus   (a.k.a.   heilmayr@math.berkeley.edu )
- - - - - - - - - - - - - - - - - - - - - - - - -
If you lived here, you'd be home already.
- - - - - - - - - - - - - - - - - - - - - - - - -
From: qemx@vax5.cit.cornell.edu
Newsgroups: rec.audio
Subject: How do loudspeaker kits compare?
Date: 15 Apr 92 09:25:58 EDT
Distribution: rec
Organization: Cornell University

Hi.  I've read quite a few posts in this newsgroup in regards to
the comparative quality of loudspeaker systems.  I'm interested
in upgrading my bookshelf speakers sometime this year, and positive
reviews of speaker systems like Vandersteen, Apogee, Magnaplanars,
PSB, B&W, etc. have inspired my interest to audition these systems
when I decide to buy.

However, relatively little has been said about building speaker systems
on your own.  I understand that Acoustic Research and others(?) manufacture
loudspeaker kits that *seem* to be of excellent value.  My question is:
	Given a budget of about $1500, could I build myself a speaker
	system superior to those commercially manufactured?

I have heard at least one story in which someone built an Audio Concepts
loudspeaker or subwoofer for about $600+ that blew away other 
commercial brands.

Thanks in advance for your reply.  Feel free to post or leave e-mail,
I'm very interested in any personal experiences in this area.


				Philip Soo
From: alexm@soul.tv.tek.com (Alex Mitaru)
Newsgroups: rec.audio
Subject: Re: A goooood subwoofer?
Date: 6 Apr 92 17:49:15 GMT
Organization: Tektronix TV Products

In article <53515@hydra.gatech.EDU> gt9605a@prism.gatech.EDU (Arlo James Aude) writes:
>To whom it may concern, there is a company in Wisconsin by the name of Audio
>Concepts.  They have a home brand 12 incher with a 2 inch throw.  The cone
>is a thick treated paper type.  The surround is butyl.  The magnet weighs
>60 ounces.  It's really two 30's stacked on top of each other to make use
>of the length of the coil.  The bobin is Kapton, and the wire is round,
>4-layer.  Why this may sound like old technology, the speaker can handle 
>400 watts thermally.  The fs is 15, qms=5.1,qes=.34,vas=414L.  The normal
>efficiency is 88db, but I have written a program that produced the 
>parameters for this speaker in a sixth-order bandpass enclosure.  The
>response was roughly 95db from 35 to 85hz.  It looks like the mechanical 
>power handling is about 400 watts also.  This would produce about 128db at35hz.
>

 Would you care to expand on this?
 
 Alex Mitaru
From: bootle@rigel.cs.pdx.edu (Lee Booth)
Newsgroups: rec.audio,rec.video
Subject: Dolby surround encoder available??
Summary: Is such a beast around for "non-pros" to buy??
Date: 7 Apr 92 18:19:55 GMT
Distribution: usa
Organization: /etc/organization

Ok, does anyone know of a "box" that will take four audio channels as input
and encode them into the two channel format that a Prologic decoder uses??
If such a beast is not available, does anyone know how to make one?
[No, I don't need to be able to offically say it is Dolby-encoded... :-)]
Please reply via email, I don't want to have to hunt through the groups, not
to mention our site has fairly quick expiration....    
Can't remember if I fixed my sig, so use bootle@rigel.cs.pdx.edu
TIA.
 
Lee Booth       bootle@rigel.cs.pdx.edu  
STRESS = The confusion created when one's mind overrides the body's basic 
desire to choke the living daylights out of some jerk who desperately
deserves it.
Newsgroups: rec.audio
From: cs012131@cs.brown.edu (William Luo)
Subject: How to tighten the bass?
Keywords: bass
Organization: Brown Computer Science Dept.
Date: Thu, 9 Apr 1992 05:19:26 GMT

	I was wondering if any one would know how I can "tighten" the bass
response from speakers with a bass reflexive design, either physically or
electronially.  I currently own a pair of Infinity SM82's, which I chosen for
their efficiency.  It wasn't until I started to listen to a lot of classical
recordings that I realize how unpleasant a loose bass can sound.
	In any case, I have tried placement but it just doesn't do enough.  I
will upgrade them when I can but I would like to be able to live with them before
that.
Newsgroups: rec.audio
Subject: CD-Deck Synchro Edit Fn. & Recordings
From: tbban@wsuhub.uc.twsu.edu
Date: 10 Apr 92 10:51:54 CST
Organization: Wichita State University, Wichita, Ks

        I'm currently looking for a tape deck for my audio system. My CD player
is the Technics SL-PS700 model. So, in order to use the CD-Deck synchro edit 
and other functions, I must get a tape deck by Technics too. 
        A friend of mine told me that the synchro edit function really helps 
reduce the "cut off" sound on the tape when you want to continue your recording
from another CD. Is it true? 
        Also, is it true that the best way to record songs is by recording them
directly from the CD player itself without going through the amp?
From: tmkk@uiuc.edu (K. Khan)
Subject: Re: CD-rot,the corrosive label scenario
Organization: University of Illinois at Urbana
Date: Mon, 13 Apr 1992 16:02:38 GMT


In article <johnson.702951464@wrs.com> johnson@wrs.com (David Johnson) writes:
>Unfortunetly, CD rot is a grave reallity.
>
>As for the pretty label silkscreened onto the non-playing side of the 
>CD causing the rot, that's not iiittt (said in that high-piched, rolling
>tone). Afriend of mine has several lazer disc's that exhibit this "rot"
>to high degrees. I mean its bad! A crab-like patch that spreads like 
>cancer through the aluminum. I did eventually render _Blade_Runner_
>unplayable.

Please be sure to keep straight in your mind the distinction between CD
rot and LD rot. Rot is a confirmed fact with laserdiscs, with many
reported cases. CD rot is a different matter entirely. LDs are two
separate data layers glued together; CDs have only one data layer, and
use different manufacturing processes, different glues, etc.; this may help
account for the difference in occurrences of "rot."
From: gfl@hera.uucp (27223-lenahan)
Subject: Re: A Golden-Ear perspective on CD players.
Organization: Bellcore, Livingston, NJ
Date: Fri, 10 Apr 92 13:09:41 GMT
Summary: rightyo
Keywords: flame bait, CD accuracy

(Lon Stowell) writes:
>      I have never actually heard anyone claim "all the same".
>      About the only people making this claim are the LP digiphobes
>      who always CLAIM that someone else said it.  
> 
>      And they tend to KEEP making this incorrect misquote even though
>      people continually point out to them that only an idiot would
>      make such a claim.  

Don't get your face red Lon! :-)  That's bawsically what I said.

Grant


Newsgroups: rec.audio,rec.video.cable-tv
From: apolivka@x102a.harris-atd.com (polivka al 60047)
Subject: Re: DMX (Digital Music Channel)
Organization: Harris Gov't Aerospace Systems Division
Date: Sun, 12 Apr 1992 21:44:49 GMT

 >     Well, I finally took the plunge and subscribed to the DMX service. I
 >think it's pretty good. I am getting 30 channels of music of all varieties
 >(classical, opera, rock, top 40 etc.) with CD quality. A few channels do 
 >have noise but I think it's from the source rather than the transmission.

I would appreciate if someone could fill me in as to what is DMX.  Is
it distributed via satellite?  TV cable?


 >Also, the changeover from one song to another is not seamless.

Does anyone know why?  Is it associated with synchronizing an audio
decompressor, or maybe an error correction decoder?

Is bandwidth compression used at all?


 >I wonder what the modulating/demodulating scheme is though.

Me too.  Does anyone know?


Thanks,
Al





--

------------------------------------------------------------------------
Al Polivka                       Internet: apolivka@x102a.ess.harris.com
Harris Corporation                   UUCP: uunet!x102a!apolivka
Electronic Systems Sector           phone: 407-729-2983
Melbourne, FL 32902
------------------------------------------------------------------------
Newsgroups: rec.audio
From: hendra@cs.columbia.edu (Hendra Soetjahja)
Subject: D/A converter builder books?
Organization: Columbia University Department of Computer Science
Distribution: usa
Date: Sun, 5 Apr 1992 23:33:44 GMT


I'm interested in building a D/A converter over the summer and I'd like to
do some reading about the details of D/A converter for audio application.
Does anyone have any pointer to any book that explains about outboard
D/A converter? 
I'd welcome any book recommendation from intro to very technical.

Thanks,  Hendra

-- 
Hendra Soetjahja		hendra@cs.columbia.edu
				(212) 932-8185  home
				(212) 932-3209  office

Newsgroups: rec.audio
From: pt@cs.brown.edu (Peter Tan)
Subject: Yamaha DSP-A1000 and DSP-A700 comments wanted
Organization: Department of Computer Science, Brown University
Distribution: rec.audio	
Date: Thu, 16 Apr 1992 09:00:46 GMT


I am posting this on behalf of a friend.  Please direct any email
reply to:
  st403383@brownvm.brown.edu  (Thai Pham)


Could anyone tell me if there are any differences in the digital
signal processing of the dsp-a1000 and dsp-a700?  

Also , could owners of the dsp-a1000 and dsp-a700 give me their impression of
these equipments?  i.e. what did you like about it, what annoys you?
What did you think of the acoustic simulations? etc...

I will summarize the replies if there are interests.

-Thanks

Thai (st403383@brownvm.brown.edu)

Newsgroups: rec.audio
From: al@qiclab.scn.rain.com (Alan Peterman)
Subject: Re: Imped. Matching w/ Resistors?!
Organization: SCN Research/Qic Laboratories of Tigard, Oregon.
Date: Sat, 11 Apr 1992 11:27:23 GMT

Actually the original poster may well be correct.  Adding series resistors
can result in MORE power being delivered to the speakers - I've seen
cases like this.

The real clue is the Infinity speakers.  I own some of the larger refrence
series and they have some rather difficult impedance dips - to as low as
1.75 ohms in certain frequency ranges.  IF the amp goes into protection
easily because it can't drive such loads adding a resistor can help.  Let's
imagine a 100 wpc amp into 8 ohms, maybe 150 wpc into 4 ohms, but it goes
into protection at 25 wpc into 2 ohms.  This is actually not uncommon.
If the speakers are presenting a 2 ohm load, you get 25 watts.  Adding a
2 ohm resistor gets the amp to it's maximum output of 150 watts, and half
that would be across the speakers - or 75 watts, which is 3 times the power
delivered into 2 ohms...

A much better answer is a amp that is happy driving low impedance loads.
 


-- 
Alan L. Peterman                                   (503)-684-1984 hm
                       al@qiclab.scn.rain.com
It's odd how as I get older, the days are longer, but the years are shorter!
From: sancese@cs.unibo.it (Silvio Sancese)
Newsgroups: rec.audio
Subject: Low-Cost yet "audiophile" Amp Advice
Date: 14 Apr 92 11:27:51 GMT
Reply-To: sancese@cs.unibo.it
Organization: Laboratory for Computer Science, University of Bologna, Italy


Hi everybody!

I'm looking for a low-cost yet "audiophile" integrated amplifier and I would like to hear from you, for your suggestions and experiences.

Budget is a real constraint, let's say approximately $700, and the destination speakers are temporary, so I am free to choose (suggestions about how to interface the amp are welcome :-)
The output power should run between 20W and 50W.

Here is a list of possible candidates (no one listened yet):

	- Proton              AM 452/5 PRO
	- Acoustic Research   A-03
	- Parasound           C/HD-350
	- Mission             Cyrus One
	- Rotel               RA-930 AX
	- Arcam               Alpha 3
	- Aura                VA50
	- Cambridge Audio     P25
	- Creek               CAS 4040
	- Musical Fidelity    B1 MKII
	- QED                 A240 SA


So, I'm looking forward your suggestions and/or experiences about any of these amplifiers or others I haven't listed (NAD, Adcom ???).
Please reply by email and if I meet interest enough I will post a summary.

Thanks in advance.

		-=Silvio

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     Silvio Sancese		     Computer Science Lab
  (sancese@cs.unibo.it)		University of Bologna - ITALIA
From: kurts@hpnmdla.sr.hp.com (Kurt Strain)
Date: Mon, 6 Apr 1992 23:55:06 GMT
Subject: Re: New LP-CD flame material
Organization: Milky Way Galaxy
Newsgroups: rec.audio

In rec.audio, jgardner@convex.com (John B. Gardner) writes:

    In article <1190690@hpnmdla.sr.hp.com> kurts@hpnmdla.sr.hp.com (Kurt Strain) writes:
    >Well, aren't people like you saying all CDs are perfect and sound the same?
    >It's a fair comparison by that standard.

    Just for the sake of "truth", I've never said explicitly or eluded to in
    any way that: "all CDs are perfect and sound the same".  I can say that I 
    have IMO heard clear differences between CD players.  I owned a Sony D5 
    for petes sake, does that say it clearly enough?

  > Comparing a highend LP system to a lowend CD player using different review
  > selections and a biased subject just has no worth.  You are correct in your 
    subject line; it's flame material.

It has some worth.  First, it might dispel the thinking that all CDs sound 
the same and is perfect.  Second, I already know why these people haven't
spent $5000 for a Wadia, yet, and that's because their $2000 table is better
(to them).  And finally, some already assume that turntables sound bad in
the cheap CD price range so that people extrapolate that the same relation
applies in the expensive range.  In other words, what it says is that good
sound in records is great if you spend money for it.  The title of the article
said LP people deplore the CD (and here's why they say that) not CD people
don't know what they're talking about.  Of course, it is taken as an attack
on the CD people's good taste, I suppose. 

    Anyway, Kurt (or anybody) have you an opinion on DCC (or MD)?  A recent
    article in SR or Audio indicated that extensive ABX tests with a wide
    variety of source material (and test equipment) found that there was *no*
    reviewer who could indicate any difference what so ever between DCC
    processing and straight-wire.

    This is significant, not only could the (fairly elite) panel not identify
    the processed signal, they could not statistically determine there was any
    difference at all. 

    Comments?

I have no opinion on DCC or MD since I never heard one. But I have heard the 
differences A/Bed blind between "straight wires" and heard the differences
and that therefore leads me to assume another low grade A/B test for this
set of panelists. I can believe they did not hear any differences and that
it proves nothing.  To claim, again, a perfect source is laughable to me.
Did we get the details of the system, the positioning, the method of A/Bing
to exact timings of exerpts of each recording used?  No. Their conclusion
can only be "it's probably good enough for most listeners."  Yet most will
view it as complete confirmation that no flaw will ever be detected.  Wrong,
in my estimation, and history will bear it out once again.  My only 
wonder is how they can make such results public and try to sell people on
their results with a straight face.  I can always rig a "no difference"
test when I want it that way.  In fact, it's damn hard not to make one.
Newsgroups: rec.audio
From: gfl@hera.uucp (27223-lenahan)
Subject: Re: Class "A" Amplifier
Organization: Bellcore, Livingston, NJ
Date: Fri, 10 Apr 92 17:44:39 GMT
Summary: Class "A" isn't that meaningful

2frlclover@kuhub.cc.ukans.edu writes:

I would object if this happened to my name, but moving on....

> Hi all,
> 
> I am a beginner in this field. I heard that Class "A" amplifier is the best. So,
> I plan to build one. Has anyone out there build a Mark V. Electronics Class "A"
> amplifier ? Or any kit amplifier ?

Have fun, you'll learn much and enjoy it.
BUT.... don't feel the need to build a class-A amplifier.  Many 
wonderful amps, that few of us can afford, aren't class-A.  In
addition, many so-called class-A amps, are not.  They "stretch"
the truth (lie).

A class-a amp must dissipate 200% of its rated power at all times;
thus it is large, inefficient, and expensive.  One popular way to
save money and metal is to lower the power, which can lead to 
clipping distortion (high) while reducing residual distortion
caused by class-AB operation (low).  Bad trade-off.

Just keep in mind that class of operation, like all buzzwords,
charecterizes but one of dozens of important parameters.  Leave\
these to the marketing folks, and careful design to the hobbyist
engineer.

I'd suggest the Hafler kits (if they still exist) since many
upgrade kits are available, but better yet, since The Audio
Amateur magazine published a series of articles on modifying
them.  One was called "Pooge II: a mod symphony for the Hafler
DH-200", TAA, 1981.  GET THIS!!!

Grant'



Newsgroups: rec.audio
From: troby@diana.cair.du.edu (Thorn Roby)
Subject: Anyone successfully using Jordan 50mm drivers?
Organization: University of Denver, Denver, Colorado
Date: Mon, 6 Apr 92 20:20:26 GMT

Long ago I built a pair of speakers using the 50mm Jordans in a 96 cubic inch
(long,skinny) particle board box lightly stuffed. I finally abandoned
them several years ago when I could no longer ignore the fact that they
had a nasty buzzing resonance around, maybe, 1 KHz. I was crossing
them over at 150 Hz. I replaced them with a satellite made from a 5"
mid and a SEAS tweeter. They sound fine, but I've always wondered whether
there was something I could have done to make the Jordans work. Anyone
have any suggestions? I never drove them very hard (a few watts, max) 
and they show no signs of damage (except for the one the cat got hold of).
-- 

Thorn Roby                              troby@diana.cair.du.edu
CARL Systems, Inc.                               troby@carl.org   
3801 E. Florida Ave.,Suite D300,Denver, CO 80210 (303) 758-3030
From: mohan@yoko.rutgers.edu (Sunil Mohan)
Newsgroups: rec.audio
Subject: Re: Opinions on Vandersteens?
Date: 9 Apr 92 19:22:18 GMT
Article-I.D.: yoko.Apr.9.15.22.18.1992.21230
Organization: Rutgers Univ., New Brunswick, N.J.

On the Vandersteen 2ce and 3's:

	One Man's Opinion ...

The 3's sound better.
Both have good bass, fair dynamics and imaging,
Veiled high-end.

Other "better" speakers in the same price range should provide a more
transparent sound, with more detail and sharper imaging.
Unfortunately, this means more revealing of bad recordings. And most
"audiophile" type of speakers suffer from poor bass. So it depends on
what type of music you listen to, and what sound qualities you yearn
for.

Vandersteen's, on their own, tend to sound very good. They never fail
to sound "musical". It is important (I feel) that you do a comparison
in the same store with an alternative. For me, the first time I
listened to the V's, I almost bought them. Then I listened to them
again after first listening to another speaker, and found the lack of
transparency frustrating. I ended up buying the other speaker, even
though I thought the bass on the V-3 to be much better (closer to
live).

_
Sunil