HDTenEightyP/NetNews huggingface dataset:
From: henken@ocf.berkeley.edu (Matthew J. Henken)
Newsgroups: rec.audio
Subject: Re: 6th Ave. Electronics--OPINIONS?
Date: 13 Aug 92 19:13:32 GMT
Organization: U. C. Berkeley Open Computing Facility
NNTP-Posting-Host: headcrash.berkeley.edu

n my original article, I forgot to ask a question that I had in mind while
writing it.  I mentioned that I would prefer to buy from the local stereo
boutique (for reasons of warranty/support), but would prefer not to pay their
prices.  Sounds pretty typical, no?  I'm eager to hear opinions on how
appropriate it would be, and how much success I would likely have if I
explained that to my salesman at the local high-end shop.  Do these shops
ever have any "give" in their prices when confronted with this sort of
situation?  I understand that stores vary, but I guess I'm looking for the
most likely/common result.  Again, any help you can provide would be
most appreciated.

Thanks again,
Matthew J. Henken
henken@ocf.berkeley.edu
From: henken@ocf.berkeley.edu (Matthew J. Henken)
Newsgroups: rec.audio
Subject: 6th Ave. Electronics--OPINIONS?
Date: 13 Aug 1992 17:31:21 GMT
Organization: U. C. Berkeley Open Computing Facility
Distribution: world
NNTP-Posting-Host: headcrash.berkeley.edu

With all of the discussion of J & R Electronics, I find myself in need of
an opinion of another mail-order store:  6th Avenue Electronics City.

I'm looking to buy an Adcom GFA-555II.  The store from which I am buying
the rest of my system (NAD 5440 and Magnepan 2.6's) wants $850 for the
Adcom amp.  With tax that comes to about $920.  6th Ave. Electronics City
is selling the same amp for $676 plus $25 shipping.  Saving $220 is nothing
to sneeze at (certainly not for someone with my financial situation!).  At
the same time, I am wondering about the advisability of ordering the product
this w.  How significant is it for an amp like this to have only a 1-year
"6th Avenue Electronics waranty."  The local stereo store price includes a full
4-year warranty.  I'm not sure what I should do.  Any thoughts/alternate places
to get this amp?

Any help would be appreciated.

Thanks,
Matthew J. Henken
henken@ocf.berkeley.edu
From: borowski@hpspkla.spk.hp.com (Don T. Borowski)
Newsgroups: rec.audio
Subject: Re: cd player shutdown
Date: 13 Aug 92 18:45:24 GMT
Organization: Hewlett Packard Company, Spokane, Wa.

In rec.audio, jwu@ds5000.DAC.Northeastern.edu (John T. Wu) writes:

>My pioneer receiver has a sleep function that turns off
>the power after a certain number of minutes.  My cd player
>is plugged into the receiver and receives a power
>shut down at the same time.  I am wondering if it harms
>the cd player to have the power shut off while a cd is
>running?  (I realize I can avoid this by programming my
>cd or calculating the playing length.  I am simply curious
>about what would happen.)

No problem at all.  This is the same as hitting the power switch on most
players.  Anyone who designs a cd player which would cause damage by
hitting any user control should be shot on sight.


Donald Borowski    WA6OMI    Hewlett-Packard, Spokane Division
"Angels are able to fly because they take themselves so lightly."
                                       -G.K. Chesterton
Newsgroups: rec.audio
From: slin@cisco.com (Steven Lin)
Subject: Re: Looking for Surround Sound Emulation
Keywords: Stereo, Surround Sound
Organization: cisco Systems, Menlo Park, California, USA
Distribution: na
Date: Mon, 17 Aug 1992 17:12:08 GMT

In article <1992Aug16.183540.17166@udel.edu> bower@pecan.cns.udel.edu (Tyson Bower) writes:

[discussion about the cheap surround circuit]
>
>A few other drawbacks of this circuit:
>- It doesn't filter out the high frequencies, or apply Dolby noise
>  reduction to the rear channel.

Is the first part really an issue?  As I understand from reading Bob
Niland's article on surround, aren't the surround channels low-pass
filtered on encoding?

Steve
From: collin@angelo.amd.com (Collin K. Ong)
Newsgroups: rec.audio
Subject: Need box size/response from T-S parameters
Date: 14 Aug 92 20:11:15 GMT
Organization: Advanced Micro Devices, Santa Clara, CA

I have some woofer specs but don't have access to my reference books on
speaker design right now.  Could somebody do a quick calculation on these
specs and email me the rundown for these woofers in sealed and ported boxes,
such as low end cutoff, box size, etc.

The specs are:
10" DVC woofer
Fs=46.0Hz
Qts=0.43
Vas=2.2 ft^3
Xmax=0.19
Pe=75W cont.

If I measured 7 ohms across each individual coil does this necessarily
mean that the driver is 8 ohm rated?

Thanks alot!
Collin Ong
collin@brahms.amd.com
Newsgroups: rec.audio
From: chrz@tellabs.com (Peter Chrzanowski)
Subject: Re: class D power amp
Organization: Tellabs, Inc.
Date: Thu, 13 Aug 1992 22:50:50 GMT

In article <1190759@hpnmdla.sr.hp.com>, darenm@hpnmdla.sr.hp.com (Daren McClearnon) writes:
> Generally, swinging tens of volts of broadcastable signals is discouraged by
> the FCC.  Shield heavily; good luck with the power supply!  Is there some 
> reason to design a Class D amplifier, or is it merely novel?
> 
The reason is to improve the efficiency, so you can get a large power output
in a small, lightweight box without nastiness like fans.  The improved
efficiency comes from using the output devices as switches rather than
as linear amplifiers; thus the theoretical maximum efficiency approaches
100 percent rather than the 70.7 percent possible with class B..

The drawback, as you say, is unwanted RF radiation.  It's not just the
~100kHZ switching rate, of course, but all those harmonics.

Sony sold a PWM ("class D") audio amp in the 1970s; I saw the thing, and
the schematic, but can't recall the model number.  It was "double shielded"
(metal screen inside a metal case) yet still radiated enough to cause
significant interference on AM radios within ~50 feet.  It was also
very small, and very expensive, for its power output.  It also used
a switching power supply, containing a tiny toroid isolation transformer.



> Just curious.
> 
> dBm.


Xref: sparky rec.audio:11614 sci.electronics:14523
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: rec.audio,sci.electronics
Subject: Re: What to do with malfunctioning phone headsets?
Date: 18 Aug 92 02:00:31 GMT
Organization: The Inquiring Mind BBS  1 204 488-1607

billd@informix.com (William Daul) writes:

> We have a number of malfunctioning phone headset.  We don't know what is
> wrong with them.  The easiest thing for us to do is toss them and buy new
> ones.
> 
> Is there anyone out there that might like them as a donation or ???
> 
> Let me know.
> 
> --Bill
> -- 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>  William Daul             Advanced Support      INFORMIX SOFTWARE INC.
>  4100 Bohannon Dr.        (415) 926-6488 - wk
>  Menlo Park, CA. 94025    uunet!infmx!billd  or  billd@informix.com

I'll take a couple and even give you our FedEx number if you think they 
are repairable.

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: rec.audio
From: gfl@hera.uucp (22402-lenahan)
Subject: Re: The future is now!
Organization: Bellcore, Livingston, NJ
Distribution: na
Date: Tue, 18 Aug 92 16:54:39 GMT
Summary: inconsistancy
Keywords: Spectral DMA 180

bower@pecan.cns.udel.edu (Tyson Bower) writes:
> 
> 100 W x 2 cont
> avg into 8 ohms, 250 x 2 cont avg into 4 ohms,

This appears strange. 28.? V rms produces 100W / 8 ohms,
and 200W / 4 ohms.  Why does the voltage go up
into 4 ohms loads?

(obviously it doesn't)

Grant


Xref: sparky rec.audio:11567 rec.video:10274
From: everett@ut-emx.uucp (Everett Wang)
Newsgroups: rec.audio,rec.video
Subject: Re: Pro-Logic Recievers (STRAV1070/D1S/etc) Summary!
Keywords: pro logic surround receiver summary sony pioneer strav1070
Date: 16 Aug 92 05:20:36 GMT
Followup-To: rec.audio
Organization: The University of Texas at Austin; Austin, Texas

>Any comments on the above Denons or those listed below (low prices,
>or any other comments) welcome.
>
>>	Kenwood 8040			375
>>	Kenwood KR-V7030		380
>>	Pioneer D1S			700
>>	Pioneer D1S-2			???
>>	Pioneer VSX-51			???  (Discontinued)
>>	Pioneer VSX-4800		300
>>	Pioneer VSX-9900S (Digital)	690
>>	Sony 2020			600
>>	Sony GXT-67ES			550
>>	Technics SA-GX710		396
>>	Technics SA-GX910		650
>>	Yamaha DSP-A1000		1150
>>	Yamaha RSX-850			615
Pioneer has a updated their prologic recievers. The models are

	VSXD901 to replace VSX-9900S	739
	VSXD701 to replace VSX-5900S	519
	VSXD601 			439
	VSX511				384
	VSX451				295

	The price is from S.B.H Enterprises at New York. Their phone number
is 1-800-451-5851. 

	I especially like VSXD601 for its DSP, digital pro-logic decoder, 
65 watt for both center channel and main channels.

	Have fun !

	Xiaolin
From: lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick)
Newsgroups: rec.audio
Subject: Re: Looking For THX Info
Date: 19 Aug 92 00:30:47 GMT
Organization: The University of Texas at Austin, Austin TX

In article <15014@umd5.umd.edu> fwilliam@lab5.smcm.edu (Frank Williams) writes:
>
>Can anyone E-mail me and address in which to gather information on home  
>THX.  Preferably from Lucas's company directly.

I have been told by a distant friend from high school who is now a
professional acoustician and a tech for a company that installs THX
that Lucasfilm is sitting tight, and I mean TIGHT, on THX at least for
now.  The official word is no, never, noway, nohow.

Now then: It is possible to do.  It's a matter of carefully tuning
your ENTIRE viewing room to theater specs (which are pretty tight --
min and max limits for reverb time, overall peak resonance freq,
deviation from flat response, etc., etc., far into the night) and
placing everything just so, using speakers with just exactly the right
performance specs.  This does not neccarily mean screamers, just known
instead of unknown values.

There's not much to the actual system, although there is some signal
conditioning involved, but the effort and expense involved in
standardizing the room is beyond most people's budgets.  BTW, I have
heard the result of this procedure done by the guy himself, and it was
indescribable.  (He also won't give me the environment specs, which is
one reason he's only a distant friend! but enough for now..)

Hope this helps some ..


-- 
<BGB>
lihan@ccwf.cc.utexas.edu        /     "I can't complain,
(really Bruce Bostwick)        /   but sometimes I still do"
from the great state of TEXAS /         --Joe Walsh--
Xref: sparky rec.audio:11718 sci.electronics:14689
From: gt8021a@prism.gatech.EDU (EASON)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Group purchase: Burr-Brown OPA604, OPA2604 op-amps
Date: 21 Aug 92 14:11:10 GMT
Followup-To: rec.audio
Organization: Georgia Institute of Technology

In article <66478@hydra.gatech.EDU> I wrote:
>> 1-24:$14.36
>>25-49: 12.64
>>50-99: 11.13
>> 100+:  5.30

> I just did a little calculation on these numbers... 100 chips at $5.30 is
> $530.  Simple enough.  How many at $11.13 would it take to break even and
> go ahead and buy 100 at $5.30?  Only 47.6 chips!  So forget the 50-99
> price scale... if you need 48 or more, just buy 100, and you'll spend
> less money and have lots of free chips.  At the 25-49 price scale, you can
> get 41.9 chips for $530, or 36.9 for $530 at the 1-24 price scale.

> So, my point is this:  I'd be willing to buy two of these at any price
> lower than $14.36 each.  At $5.30, I'd buy four.  Do we have 22 more people
> who would buy a pair of these at $5.30 each?

After getting home, the horror of having posted a mistake in logic to the
net.ravenous.wolves hit me.  Having thought it through more carefully, we
would need 17 more people willing to buy a pair of chips at $14.36 each, or
19 more people willing to buy a pair of chips at $12.64 each, (or 22 people
at $11.13 per chip), after which those buying chips would divvy up the 
remaining of the 100 chips according to how many each person bought at full 
price.

Better now?
-- 
Bill Eason              w-404/894-2381             h-404/352-6914
BE-EE/CS Vanderbilt U. May 1987      MS-EE Georgia Tech June 1992
wte@cdrom.gtri.gatech.edu (pref.)  -or-  gt8021a@prism.gatech.edu
Newsgroups: rec.audio
From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Subject: Re: Who dat say dey gonna buy dat DAT?
Reply-To: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Organization: Columbia University
Date: Fri, 21 Aug 1992 05:12:07 GMT

In article <44637@ucbvax.BERKELEY.EDU> sklower@diva.Berkeley.EDU (Keith Sklower) writes:
>
>Let's see, one order of magnitude is $6K .....
>well, I've heard many, many good things about the pansonic SV-3700
>which is only $1300, 

I'll add to the list of the many, many good things you've heard about the
SV-3700.  I use 'em daily and they're great.  Still, I'd use outboard A/D.

>and seem's like you could buy the apogee outboard
>A/D converter for $2K

You could buy an Apogee for $2K, or a Pygmy AD1 for $4K.  These output
AES/EBU (the Pygmy does, and I think the Apogee does too), so you'd either
need a pro deck that can speak AES or you'd also need an S/P-DIF-->AES/EBU
format converter such as the DD FCN-1 if you wanted to feed your $600 box
with it.

> and fee your $600 home deck with the bit stream
>it provides giving a remarkably good record engine for well less than $6K....

Well, you aren't done yet.  If you're recording live, you still need preamps,
a good set of which can easily run you another $2K.

>Maybe Gabe was talking about binary orders of magnitude ;-)

That's it ;-)


--
Gabe Wiener - Columbia Univ.     "This 'telephone' has too many shortcomings 
gmw1@cunixa.cc.columbia.edu       to be seriously considered as a means of 
N2GPZ in ham radio circles        communication. The device is inherently of
72355,1226 on CI$                 no value to us." -Western Union memo, 1877
From: schuster@panix.com (Michael Schuster)
Newsgroups: rec.audio
Subject: SONY MDR-V6 phone disassembly
Summary: How to remove the earpads
Keywords: SONY, headphones, rubber, foam, rot, disassembly
Date: 17 Aug 92 22:31:16 GMT
Organization: PANIX Public Access Unix & Internet, NYC

Well, Rubber Foam Rot has struck my Sony MDR-V6 headphones. The foam
sheet which sits between your ear and the driver is flaking away,
leaving little bits of black dust all over my ears. Rather than pay
the small fortune Sony probably charges for a replacement, I'd like to
just remove the ear cushions and separate the sheet of foam from them
- then put them back. I'll do without the foam layer.

But - how to remove them? The edges of the cushions tuck neatly into a
very thin groove along the outer edge of each 'phone assembly. I fear
I could never get them back inside once removed. Is there a trick to
opening up the earpiece?
-- 
_______________________________Mike Schuster________________________________
NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
The Portal (R) System: schuster@cup.portal.com   | MCI Mail,GEnie: MSCHUSTER
From: sward@vaxwrk.enet.dec.com (Peter Sward)
Newsgroups: rec.audio
Subject: Active xover for sale
Date: 14 Aug 92 19:58:26 GMT
Reply-To: sward@vaxwrk.enet.dec.com (Peter Sward)
Organization: Digital Equipment Corporation, Maynard MA




    DB systems active crossover.

    2 way active crossover.
    Butterwort filter
    24db/octave
    100Hz
    Common bass or stereo bass
    Separate powersupply.

    Checked out 1 year ago by Db system since I had a problem with one
    channel. This is a VERY good crossover and DB systems will tailor it to
    your need if you want to change anything.

    It's in very good condition
    Asking $350

    Peter Sward
    508-493-8497
    Maynard, MA
Newsgroups: rec.audio
From: ascheng@athena.mit.edu (Adelbert S Cheng)
Subject: What does "gray-market" mean? (Was J&R Music World)
Organization: Massachusetts Institute of Technology
Distribution: na
Date: Thu, 13 Aug 1992 14:26:41 GMT

In article <FOX.92Aug13041710@graphics.nyu.edu> fox@cs.nyu.edu (David Fox) writes:
>I deal with J&R face to face a fair bit, and for these reasons:
>
>1. They are strictly non gray-market.
                          ^^^^^^^^^^^
>2. Their prices (at least in person) are "almost rock bottom",
>   that is, not as good as the gray market prices you see in
                                ^^^^^^^^^^^
[rest of article deleted]

Excuse my ignorance, but what does this term "gray-market" mean?  From what
I can gather from the context of a couple of recent posts, gray-market
products seem to be perceived as inferior to "non gray-market" products.

I recently bought a receiver from a mail order place that advertised in the
back of Audio Mag.  How can I find out if it is gray-market?  Is it
bad if it is?

--
Ed Cheng
ascheng@athena.mit.edu
Newsgroups: rec.audio
From: p0p4018@zeus.tamu.edu (PREMTHAMKORN, PRAKIT)
Subject: Re: Passive preamps revisited
News-Software: VAX/VMS VNEWS 1.41    
Organization: Texas A&M University, Academic Computing Services
Date: Fri, 21 Aug 1992 17:32:00 GMT

In article <BtBF3s.4q7@watserv1.uwaterloo.ca>, paul@gaitlab1.uwaterloo.ca (paul j guy) writes...


>	As far as a passive preamp limiting the dynamics, I don't
>buy it, unless the frequency response calculations show the roll-off
>creeping in toward the audio top end (20 kHz). The noise floor
>for a passive preamp is limited by the thermal noise of the resistors,
>and that's a long way down from the point of view of a power amp.
>The passive is not limited to maximum levels, until it starts to
>smoke, or fry the internal parts (assuming them to be of reasonable
>quality). Poorer quality power amps may give somewhat poorer
>behaviour driven from high impedances, when it comes to slew-rate
>limiting or overload recovery. Assuming that the power amp input
>stages never get close to overload when the output stages clip,
>and they have good isolation from the feedback signals, I don't
>see input impedance being a significant issue as far as dynamics
>go. I have seen crummy power amps putting out a lot of noise
>(wide band) on open circuit inputs, and getting tolerable quiet
>on a low impedance input, but I think that this stuff is not
>representative of the quality most of you would buy.
>	.... just my two cents' worth, give me hell if you think
>I'm full of it......
> 
>	-Paul
> 
>
I built my passive preamp with the finest quality parts I could find and
afforded.  I made it simple as I can to preserve the sonic quality from
the source.  It sounds transparent, clean with breath-taking sound staging.
With pop, rock and jazz music, it outperforms my Krell KSL in almost every
aspects (its low end is leaner that the Krell's).   It is when I listen to
large scale orchestra or solo piano (the latter is amazingly demanding) that
it does not as dynamic as the KSL.  Despite the fact that the KSL is inferior
to the passive preamp in areas I mentioned above, it is the much better dynamic
range that make the Krell excels and is more preferable.

The differnce is significant.  I don't need to put the resisters in the stepped
attenuators into smoke to hear the difference.  On the other hand, I don't think
you need anything better than an average system to distinguish them either.

Prakit
From: trw@spl1.spl.loral.com (Tim R Witort)
Newsgroups: rec.audio
Subject: DAT vs Analogue (was Who dat say dey gonna buy dat DAT?)
Date: 20 Aug 92 17:36:18 GMT
Organization: Loral Software Productivity Laboratory

In article <25019@castle.ed.ac.uk>, sss@castle.ed.ac.uk (S S Sturrock) writes:
|> In article <1992Aug19.164701.11755@wdl.loral.com> trw@spl1.spl.loral.com (Tim R Witort) writes:
|> >  The thing still makes better recordings than any analog deck in the
|> >world. And those babys can go for $2000+!
|> 
|> I love it!  Know any other good ones like this?
|> 
|> A cheapo $600 DAT deck outperforming $2000 analogue decks?  har har har!
|> Leave those scopes alone and listen to the damn thing!

   I have. That's why I bought a DAT deck.
  
|> The *APPALLING* ADC
|> set ups in consumer DAT decks with their magnificent pre-sampling filters
|> are just a joy to behold.  Har har har!!!!  Not to mention the things being
|> full to the brim with poxy op-amps giving cheaps**t Japanese sound.

   Forgot your IMHO didn't you?
 
|> Sheesh, do you people only listen to bass?

   No. I listen to the full frequency range.

|>  Are your ears so damaged by
|> years of excessive volume listening that you cannot hear the detail you are
|> missing?  The life?

   No. My last hearing check a couple of years ago showed that my hearing
was very acute - particularly in the higher freqs. I have performed A-B
comparisons of DAT recordings and the recorded source (both analogue and
digital sources) and found the DAT recordings to be indistinguishable from
the originals and every bit as "detailed" and "lively."

|> Besides which, $2000+ is rather thrifty don't you think?  Not really the
|> sort of cheap tat that a recording studio would mess around with.

   I agree. Studios wouldn't touch a $2000 machine. But I was refering to
consumer analogue cassette decks. In this realm, a $2000 deck is one of the
more expensive. And against such a deck, I believe my DAT deck is the
superior recorder.
 
|> Shane Sturrock

-- Tim
From: smee@bristol.ac.uk (Paul Smee)
Newsgroups: rec.audio
Subject: Re: Audiolab amps
Date: 14 Aug 92 09:00:12 GMT
Reply-To: P.Smee@bristol.ac.uk (Paul Smee)
Organization: University of Bristol

In article <1992Aug13.223156.29246@leland.Stanford.EDU> ianchan@leland.Stanford.EDU (Ian Hin Yun Chan) writes:
>I'm wondering what people think of the Audiolab 8000 pre/power amps as compared
>to similarly priced Adcom gear. That is, of course, assuming that people have
>_heard_ of Audiolab before.... What are their prices, and where are they
>available? Audiolab is British, BTW, and I'm interested primarily in their line
>level inputs (read: I don't play LP). A few key specs would also be
>appreciated.

I run an AudioLab 8000P power amp, and I'm VERY happy with it.  I don't
use their preamp, though.  Use a Rotel RTC-whatever-it-is tuner/preamp
instead, chosen in large part because the reason we were upgrading at
the time was to get remote control of the tuner and volume.  They get
along very well together, though.  Don't know Adcom; we don't get it
over here.  The AudioLab stuff is very nice, though.  Probably
expensive in the States.

I believe the specs may have changed a bit with the latest model.
Don't know most of them off by heart anyway.  The pre has, I believe, 4
line in, phono (MM or MC), and 2 or 3 tape loop interfaces.  Power amp
only has provision for one set of speakers -- i.e. no speaker-select
switch -- and when I got mine was 100 WPC, and handles speakers of 4-16
ohms.  I believe, but am not sure, that the newest version is a bit
higher powered and has 2 sets of binding posts so you can bi-wire your
speakers more easily if you like.  All the other fiddly little specs
(THD, separation, ...) are the sorts of numbers you'd expect from
something at that price level.

-- 
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
Newsgroups: rec.audio
From: monta@image.mit.edu (Peter Monta)
Subject: Re: class D power amp
Organization: MIT Advanced Television Research Program
Date: Thu, 13 Aug 1992 00:45:29 GMT

There's been some recent interest, I seem to remember, in class-D
audio power amplifiers that use sigma-delta oversampling DACs in place
of the PWM driver.  This considerably relaxes the filtering
requirement.  Check out the recent AES preprints; I think the Feb 92
batch had a paper on this.

Peter Monta   monta@image.mit.edu
MIT Advanced Television Research Program
Newsgroups: rec.audio