HDTenEightyP/NetNews huggingface dataset:
From: frankc@tgf.tc.faa.gov (Frank Coffman)
Newsgroups: rec.audio
Subject: BOSE AM-7 Speakers
Summary: bose am-7 for pro-logic?
Keywords: bose pro-logic
Date: 28 Dec 92 16:15:23 GMT
Organization: FAA Technical Center, Pomona, NJ
NNTP-Posting-Host: offserv2.faa.gov

I'm considering Bose AM-7 speakers for a pro-logic setup.  After using
a variety of center channel speakers, I'm convinced a matched center channel
speaker is a better way to go.  I personally wouldn't mind a big conventional
speaker on top of the entertainment cabinet, but my wife likes the size
of the Bose system.

Anyone have any comments pro or con on this system?  I'm also aware of similar
units made by Pioneer, JBL & Infinity and would be interested in comments
on these as well.


--
*********************************************************************
* Frank Coffman     TGF (Target Generation Facility)                *  
*                   FAA Technical Center, ACN-400c                  *
*                   Atlantic City Int'l Airport, NJ 08405           *
Newsgroups: rec.audio
From: cliff@jhunix.hcf.jhu.edu (Cliff Chen)
Subject: Re: MiniDiscs -- What Are They?
Organization: HAC - Johns Hopkins University, Baltimore
Date: Mon, 21 Dec 1992 19:06:25 GMT

In article <1992Dec21.140133.1002@spider.co.uk> colint@spider.co.uk (Colin Tinto) writes:
>In article <1992Dec21.102747.1242@ultb.isc.rit.edu> yxl5388@ultb.isc.rit.edu (Y.X. Liu) writes:
>>In article <1992Dec21.080720.27222@ultb.isc.rit.edu> mds5142@ultb.isc.rit.edu (M.D. Shepherd) writes:
>>>...Is there a stereo sized component MD player, or is the
>>>portable device made to become part of the system itself?  An MD component
>>>would seem to defeat its main purpose, portability, so maybe that's a
>>>stupid question.  Anyway, it'll be interesting to see what happens with
>>>2 new formats out there.
>>
>>The price is around $700 and dunno if it's my problem or what but the
>>cassette tray always seems to get stuck halfway through. I also doubt that
>>there'll be an MD component, but hopefully smaller units will be made
>>soon.
>>
>>=Fractalman
>>yxl5388@ultb.isc.rit.edu
>
>What we really need is a stereo sized component that has both an MD and DCC 
>player in the one component box.
>
>Surely since the decompression technology is similar (identical ?) this
>would be a reasonable thing to do ?

	I really doubt it.  I'm sure that neither Philips or Sony allowed
any hint of their technology out of their development stages.  With both
algorithms designed separately, the chance of similarity are pretty small.
I don't think we'll see a combined MD/DCC machine in several years.

>Or maybe redesign a CD player so it will play MDs as well...

	No good.  If you have ever seen an MD, you know that it comes in
its own little plastic casing.  You can't even see the actual disc without
opening it.  In order to redesign the CD player you'd have to add an
entirely new laser read-head, as well as develop a way for the current CD
tray to adapt to the new casing.  In other words, you'd basically have to
create a whole new component anyway.  It would just be two components in
one.  No real savings except for space.

						Cliff Chen
						cliff@jhunix.hcf.jhu.edu
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Mon, 21 Dec 1992 17:45:07 GMT
Subject: Re: CD Sound Quality
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.audio

> 	Obviously yet another "critical listener" who auditioned
> 	a $200 CD player versus a $200 phono set-up and decided
> 	that digital was inherently better.
> 

Not so fast, Mike - that same sin (or similar) has been committed equally 
often by the pro-analog crowd; especially the sin of believing that a problem
with a particular "digital" system or implementation was sufficient to damn
the basic idea of digital storage.

What I would love to see would be a posting from someone who dislikes any of
the current digital formats, in which an improved format is suggested, and 
*why* that person thinks that the proposed improvements are worthwhile.


> 	PS--  I've been wondering: wouldn't it be possible to
> 		have a optical, analog format?  Isn't that
> 		effectively what LD's are?  Would such a format
> 		give us the best of both worlds: durability,
> 		convenience, *and* sound quality?

Yes, that IS what LDs are; now why do you think this would be better than
any existing format?  The bandwidth?  They're certainly not very convenient
(too big), nor are they as durable as CDs (given the analog nature of the
signal, they're not nearly as forgiving of defects as the error-corrected
digital CD format).


Bob Myers            | "One man's theology is another man's belly laugh." 
myers@fc.hp.com      |                     - Lazarus Long/Robert A. Heinlein
                     |                                
Newsgroups: rec.audio
From: rsilvers@nynexst.com (Robert Silvers)
Subject: Re:  CD SOund QUality
Organization: Nynex Science and Technology
Date: Wed, 23 Dec 92 18:59:45 GMT

In article <vanz.029i@tragula.equinox.gen.nz> vanz@tragula.equinox.gen.nz (Martin Nieuwelaar) writes:
>
>Say you sample at 44 KHz.  The maximum theoretical limit of frequency
>you can capture is half of this, 22 KHz.  However, at this rate there
>are only two samples per cycle.  With two samples per cycle, a sine
>wave will sound the same as a square wave.  Surely this is not hi-fi?

	Remember that the input to the A-D is low-pass filtered before
recording.  A 22 Khz square wave has higher frequency components that
result in the square edges.  After low-pass filtering, this becomes a
22 Khz sine wave, which is exactly what you get when you play is back.
It should be no different than listening to a live signal band-limited
to 22 Khz!
						--Rob.
From: ereiss@ocf.berkeley.edu (Edward Reiss)
Newsgroups: rec.audio
Subject: Vandersteens and Stereophile
Date: 27 Dec 1992 05:44:17 GMT
Organization: U.C. Berkeley Open Computing Facility
Distribution: world
NNTP-Posting-Host: maelstrom.berkeley.edu

I just perused Stereophiles most recent "Reccomended Components"
issue.  I noticed that none of the Vandersteens were in any of
the five groups of reccomended speakers.  I have listened to and
am on the verge of purchasing Vandersteen 2CEs and I thought that
they were clearly superior to many of the class C speakers in the
same (or greater) price range.  Does anyone know if any of the 
Vandersteens have been reviewed in Stereophile or the Absolute
Sound? 

Thanks,

Ed Reiss
Newsgroups: rec.audio
From: ldormon@uk.oracle.com
Subject: Subwoofer Cookbook question
Keywords: design JBL subwoofer
Reply-To: ldormon@uk.oracle.com
Organization: Oracle Corp
Date: Wed, 30 Dec 1992 13:19:09 GMT
X-Disclaimer: This message was written by an unauthenticated user
              at Oracle Corporation.  The opinions expressed are those
              of the user and not necessarily those of Oracle.

Hello all,
	I've just got my copy of Vance Dickason loudspeaker cookbook, and the parties
that my friends and I use to run have gone down the pan, so I've
inherited one JBL 45/60
cab with a JBL 2225 driver.

The cab is far to big to use in my room, so I thought I'd take the
driver out and build
a box that would fit under my bed, I rang up JBL and they sent me the
data sheet for the
2225. I then got the cookbook and tried to use the formulae for the box
designs, but I
think I must be doing something wrong, I'm using the C4 alignment with QL=7.

Qts for the woofer is 0.28,so Vb=Vas/0<
			         6ft^3/3.2360=1.8541409 which seems very small.

All the calculations I do seem th come up nonsense, could some tell me
what I'm doing
wrong, or be kind enough to run it though perfectbox or something, I'm
looking for low
f3 and have about 15ft^3 to play with.

Thiele-Small Parms for JBL 2225 (H (8ohms))

fs	 40Hz
Re	 6.3 Ohms
Qts	 0.28
Qms	 2.5
Qes	 0.31
Vas	 6ft^3  (170 l)
SD	 138 in^2
Xmax	 0.2in
VD	 27in^3
Le	 1.1mH
No(Half space)	 3.5%
Pe (MAX)	200W Con sine wave

Effective Piston Diam	 13.25in 

Many many thanks

Lee

ldormon@uk.oracle.com

Ps I think JBL where having a clear out, cos I got nice printed data
sheets for loads 
of old (and new) woofers, so if your having prob getting some info, drop
us a mail.
Newsgroups: rec.audio
From: steve@endgame.gsfc.nasa.gov (Steve Rezsutek)
Subject: Re: Carver and the FAQ
Organization: NASA Goddard Space Flight Center; Greenbelt, MD
	<1992Dec23.035505.10634@udel.edu>
Date: Wed, 23 Dec 1992 14:34:57 GMT

bower@pecan.cns.udel.edu (Ty Bower) writes:

   [Bob Carver] often tends to use techno-babble and often seems
   to be making things up to make his equipment sound impressive.
   More often than not, he will "spare" the listener the details
   of how and why he has achieved whatever engineering marvel he
   has achieved and give it a "cool name."  (Magnetic field power
   amps come to mind... what the hell is a magnetic field power
   amp, anyway?)

Well, I won't even pretend to give a definitive answer (ask the
guys in sci.electronics?), but "magnetic field power
amplifiers" are "real" things.  They use an element, called a
"reactor" I believe, which I recall being something like a
cross between a tube and a transformer (not really, but bear
with me).  A little bit of current flux in one winding can
*control* (not induce) a much larger current flux in another
winding.  In their cruder forms they often find use as dimmers
for stage lights.

Just dredging the depths of my almost forgotten EE education...

Steve

---
Steven Rezsutek					steve@endgame.gsfc.nasa.gov
Nyma / NASA Goddard Space Flight Center, 
Greenbelt MD 					301 286 7014
From: frankc@faatcrl (Frank Coffman)
Newsgroups: rec.audio
Subject: Re: RECOMMANDATION FOR WALKMAN ABOUT $100
Date: 22 Dec 1992 13:17:44 GMT
Organization: FAA Technical Center, Pomona, NJ	
Distribution: world
NNTP-Posting-Host: offserv2.faa.gov

fm@neptune.iex.com (Mohammad Farooq) writes:


>I posted this article a few weeks ago but didn't receive any response. I would
>appreciate if someone on the net can share his/her experince with me. I am
>thinking to buy a walkman. I am looking for best sound quality and some good
> options.If someone has done comparison, I would like to have the results. 
>Thanks in advance.

Sony sports.


-- 
*********************************************************************
* Frank Coffman     TGF (Target Generation Facility)                *  
*                   FAA Technical Center, ACN-400c                  *
*                   Atlantic City Int'l Airport, NJ 08405           *
* Internet:frankc@tgf.tc.faa.gov                                    *
*********************************************************************
From: micro19@cbis.ece.drexel.edu (A Techno-Discordian)
Newsgroups: rec.audio
Subject: Will there always be hiss in a walkman?
Date: 31 Dec 92 20:12:22 GMT
Organization: Drexel University, College of Engineering, Philadelphia, PA

I notice that music that I taped from my CD has a noticable amount of his when
I play the music back in a walkman.  Would getting a better walkman reduce
this hiss?  I was told that tape will always have hiss because the tape
contacts the head, generating noise in the process.  How does really high-cost
tape decks deal with this?

Thanks
From: ibhan@husc8.harvard.edu (Ishir Bhan)
Newsgroups: rec.audio
Subject: Re: questions on new digital formats
Date: 2 Jan 93 02:50:44 GMT

mbk@lyapunov.ucsd.edu (Matt Kennel) writes:

>kz08+@andrew.cmu.edu (Ken Zuroski) writes:
>I wonder if it's a marketing mistake, though.  I suspect people will
>pay more for something that looks like a CD then for something that
>looks like a tape.

Well, I bet the reason is that they wanted the stores to accept it. 
Stores who already have lots of tape racks probably wouldn't be crazy
about getting totally different racks for an emerging format.  It makes
the transition from tape to MiniDisc easier.  Also, DCC uses the same size
case as analog tapes, so MiniDisc's use of the same size case doesn't let
DCC have the advantage there.

>From a consumer point of view, the MD players are alot "neater" than
>DCC players.  No rewinding, bump-resistant, and recording as a file-system.

>Clear advantages over DCC.  Does b/w compatibility matter that much?

I agree, but I haven't seen any ads in magazines for MiniDisc yet, though
I've seen quite a few for DCC.  Not too smart, Sony.  I'm sure they'll
appear soon, though.  Right now, both DCC and MiniDisc are out of my price
range.  There's no doubt in my mind that MiniDisc is the better system. 
I'm just waiting for cheaper/smaller units.
-- 
               -  Ishir Bhan -  ibhan@husc.harvard.edu  - 
                                     - - - 
           "The sky and the impossible explode..." -The Cure
From: kirk@hpcc01.corp.hp.com (Kirk Lindstrom)
Date: Wed, 23 Dec 1992 18:41:22 GMT
Subject: Re: Opinions on PIONEER (A-757) Reference stereo amp......
Organization: Shredding the water of SF Bay, HP-OCD
Newsgroups: rec.audio

>    Just yesterday I had requested opinions on the pioneer amp(A-757) which is
>150W + 150W/4 & 100wpc/8-ohm reference amp.I also purchased the SONY CDP-297
>.But to my dismay the system sounds "VERY DUSTY".I also bought JENSEN 3013
>3-WAY speakers & an ONKYO AM/FM TUNER.All in all I busted $1200 on this, but the
>sound quality seems to be very poor.Could someone out there please guide to the
>"blachsheep" of the components, I have purchased ?? Its over a week ago that I 
>bought the AMP & TUNER from NBTW.Could I try returning the same now, if the amp 
>is the culprit.I'm kinda confused........Please advise.......
>
>Thankx in advance for any help.....
>
>warm regards,
>sudesh.
----------

My guess is it is the speakers.  For a $1200 system, you should spend a
minimum of $300 of it on speakers (I'd lean toweards $600).  Try borrowing
(or buy and return) some $300 Celestian, B&W, Paradigms. Mirage, etc.
speakers.  These should be in another league than your Jensen's (but I
could be wrong as I haven't listened to them).

Kirk out
Newsgroups: rec.audio
From: gts@gnu.ai.mit.edu (The Evil Microwizard)
Newsgroups: rec.audio
Subject: DCC vs MD compression schemes?
Date: 26 Dec 1992 21:55:34 GMT
Organization: MIT Artificial Intelligence Lab
Reply-To: gts@gnu.ai.mit.edu
NNTP-Posting-Host: churchy.gnu.ai.mit.edu

a friend of mine and i were just wondering:

is the lossy compression scheme on DAT the same as that found on MD?

one answer we found was 'of course not, that would make sense.' 
does anyone have a more authoritative answer, i.e., perhaps seen some
of the specs or whatever?

and i DO like the idea of an MD-based answering machine...
--
Greg Samson / Dr. Evil Microwizard (gts@gnu.ai.mit.edu)
Newsgroups: rec.audio
From: jesse@vicorp.com (Jesse Shiah)
Subject: Help! Where to buy tweeters?
Organization: V. I. Corporation, Northampton, Massachusetts
Date: Wed, 30 Dec 1992 02:06:13 GMT

Hello!

I have a pair of Monitor Audio Model R352 speakers which was purchased
in England before Monitor Audio started marketing their speakers in
States not too long ago. The tweeters( 3/4" soft-dome type) are now 
broken. I know Monitor Audio now has a distributor in States but I 
doubt they have parts for Model R352 since it is quite old now. I am
thinking to buy a pair of third-party soft-dome tweeters to replace 
the broken ones but have no idea where to look for. Also, I would like
to make sure the new tweeters are good quality ones. I know some people
build their own speakers so there must be some where you can purchase
the teweeters. I called up one guy who advertise in StereoPhile magazine
and build customerized speakers, He suggested me to use soft-dome tweeter
from Dana Audio for about $35/each(if purchase from him). 

Does any one have any comments?

1. Where can I get quality tweeters? 
2. Is the person's statement that Dana Audio has the best soft-dome 
   tweeters true or not? Is the price he is asking a fair price?
3. Do you have any other suggestions?

Please help! Life is difficult without music.

Thanks in advance!

-Jesse Shiah
413-586-8371 x 254
From: ptg2351@uxa.cso.uiuc.edu (Panos Tamamidis )
Subject: Re: Opinions on PIONEER (A-757) Reference stereo amp......
Organization: University of Illinois at Urbana
Date: Wed, 23 Dec 1992 23:43:00 GMT

kirk@hpcc01.corp.hp.com (Kirk Lindstrom) writes:

>>    Just yesterday I had requested opinions on the pioneer amp(A-757) which is
>>150W + 150W/4 & 100wpc/8-ohm reference amp.I also purchased the SONY CDP-297
>>.But to my dismay the system sounds "VERY DUSTY".I also bought JENSEN 3013
>>3-WAY speakers & an ONKYO AM/FM TUNER.All in all I busted $1200 on this, but the
>>sound quality seems to be very poor.Could someone out there please guide to the
>>"blachsheep" of the components, I have purchased ?? Its over a week ago that I 
>>bought the AMP & TUNER from NBTW.Could I try returning the same now, if the amp 
>>is the culprit.I'm kinda confused........Please advise.......
>>
>>Thankx in advance for any help.....
>>
>>warm regards,
>>sudesh.
>----------

>My guess is it is the speakers.  For a $1200 system, you should spend a
>minimum of $300 of it on speakers (I'd lean toweards $600).  Try borrowing
>(or buy and return) some $300 Celestian, B&W, Paradigms. Mirage, etc.
>speakers.  These should be in another league than your Jensen's (but I
>could be wrong as I haven't listened to them).

>Kirk out

 I couldn't agree more with this.  I think you should try your system with
 B&W or Mirage.  If the sound is still "dusty", then try an adcom for a
 change, and return your Pioneer.

 Merry Cristmas,

 Panos Tamamidis
Newsgroups: rec.audio
Subject: Re: CD Sound Quality
From: MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham)
Date: Sun, 27 Dec 1992 05:05:30 GMT
Organization: La Trobe University
X-News-Reader: VMS NEWS 1.24

In <1992Dec26.072221.1912@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com writes:

> myers@hpfcso.FC.HP.COM (Bob Myers) writes:
> : > Say you sample at 44 KHz.  The maximum theoretical limit of frequency
> : > you can capture is half of this, 22 KHz.  However, at this rate there
> : > are only two samples per cycle.  With two samples per cycle, a sine
> : > wave will sound the same as a square wave.  Surely this is not hi-fi?
> : > Suppose you say that you cannot hear this high a frequency.
> : > Well, at 11 KHz, there will be 4 samples per waveform.  How close
> : > to a pure sine wave can you get with 4 samples?  By looking at it,
> : > not very.  I'm not sure how noticable the difference in the sound is.
> : > I guess it wouldn't be difficult for someone with a computer with
> : > reasonable sound capabilities to try this out.
> : 
> : God, not this again.  Here, let me introduce you to my good friend, 
> : Mr. Fourier, and his friends, Mr. Shannon and Mr. Nyquist.....
> 
> He probably believes that the lathe cutter cuts a square wave into 
> the vinyl on the analog disc.
> 
> Bill
From my experience (not pleasant) of trying to teach integral transform 
methods, I'd say there are a lot of people who simply have no understanding
of how the whole sampling/filtering/reconstruction thing works. Then, quite
reasonably given the behaviour of politicians and others in positions of trust,
they say: How do I know you're not bull shitting me in a huge conspiracy
with Sony and the CIA?

So I offer the following balm to your faith: buy or borrow an audio signal
generator (battery powered hand-helds can be had for <$100, and are quite
useful for checking room resonances, speaker probs etc etc). Connect it to
your stereo, set 3kHz and turn it up fairly loud. Now move the frequency
up to 22kHz. Hear anything? If not, we have covered the difference between
sine and square waves at 22kHz: they both sound like silence.

If you CAN hear something, try throwing the little switch that gives
square waves instead of sines. Any difference? (it might be louder, since
the square waves are generated differently and often don't match in level).
Now turn the frequency down, until you find the highest frequency where you 
can here a definite difference between square and sine.... Let me know if
you are confident about the difference above 7kHz.

Actually, I should advise caution with the square waves... if you have 
weak knee-d tweaters, high level square waves could fry 'em... so use low
levels for that part ok?
Have fun,
Graham B
Newsgroups: rec.audio
From: jan@gluon.ansoft.com (Seaway Jan)
Subject: Fan for Adcom 555 for Thiel speakers?
Organization: Ansoft Corporation
Distribution: rec
Date: Mon, 21 Dec 1992 16:05:04 GMT


	For Adcom power amp 555, there is an fan option which is described
as "needed for low impedance or insensitive speakers".
	I looked up the spec sheet of Thiel speakers, all of them have
nominal impedance of 4 ohm or less.
	So do I need a fan equipped 555 for Thiel Speakers? Any experience
or recommendation is welcome.

Thanks.

Seaway
Newsgroups: rec.audio
From: mso26892@uxa.cso.uiuc.edu (Tal )
Subject: Re: Speakers under $300 (Boston Acoustics HD-8?)
Organization: University of Illinois at Urbana
Date: Mon, 21 Dec 1992 18:17:24 GMT

stevan@alchemy.tn.cornell.edu (Stevan Vidic) writes:


>Hi everyone,

>I would like to buy a pair of speakers for under $300 and have checked the
>local stores.  One carries Boston Acoustics HD-8 for $250.  These are
>two-way speakers with 8" bass/midrange.  Has anyone listened to these
>speakers?  I would appreciate any comments you might have.  Also, if
>you feel that there are other speakers in this price range worth
>considering (I recall seeing small Infinities, Energy, Bose, Acoustic
>Research), I would appreciate your advice.  I listen to classical as 
>well as rock and blues.  Thanks!

>Regards,
>Stevan

Consider Mirage 260 and Celestion 3.  These are great values at their price;
Mirage that I bought about a year ago was $250/pair and Celestion 3's are listed
at $279/pair(I believe Cel's can be purchased at a bit lower price).  The
sound quality of these are among the best in their class.  

The Mirage's that I own have high to mid frequency reponse better than majority of speakers at twice the price.  As far as bass is concerned, they are 'good'.
They are not going to shake any rooms but they give good, honest and clean(
which is important to me) bass considering the size.  The company might have
updated the line since I bought (yes, they made me enjoy music and forget
about hardware), you should check'em out.  

Celestion 3's were one of the final choices that I had back then after some
research.  Although I listened to them only for a day(yeah, the dealer wouldn't let me audition for longer time), they sounded very good especially in the
trebel.  In fact, they're one of few low cost speakers recommended by the
Stereophile which I usually trust.  

If you listen to classics and jazz a lot, well, in fact any kind, and are
in need of clean sounding speakers under $300, I think you should try
listening to those.  Other speakers that I didn't have chance to listen to
but are believed to be pretty good are Wharfedale Diamond IV's.($300)  They
are supposedly smooth sounding.  Again, any speaker under $300 probably won't 
give you overwhelming listening experience.  However, there are many
speakers on the market and some are definetely better than others even when
they are cheaper.  Wish you a good buy.  Oh BTW, if you don't know yet, be awareof what seems to be best deals usually offerd in the back pages of magazines.
Sometimes what they send you is not what you want.  I learned by mistake
when I *twice* had to return defected speakers and finally ended up getting
marginal refund weeks after.  Anyhow, have fun shopping!

Minsuk