HDTenEightyP/NetNews huggingface dataset:
From: tuohy@dune.Eng.Sun.COM (Bill Tuohy)
Newsgroups: rec.audio
Subject: Speaker building info
Date: 2 Sep 92 20:41:20 GMT
Reply-To: tuohy@dune.Eng.Sun.COM (Willam Tuohy)
Distribution: na
Organization: Sun Microsystems, Inc.  Mt. View, Ca.
NNTP-Posting-Host: dune

There seems to be a fair amount of interest in speaker projects,
so here is a list of resources.  Books to start with are Loudspeaker
Design Cookbook by Vance Dickason, Great Sound Stereo Speaker Manual
by David Weems, and High Performance Loudspeakers by Martin Colloms.
I believe Old Colony sells them all, they are listed in the order I
think is the best prioity.

A&S Speakers
3170 23rd St.
San Francisco, CA 94110
(415) 641-4573

 drivers, xovers, kits

Audio Concepts
901 S. 4th St.
La Crosse, WI 54602
(800) 346-9183

 drivers, xovers, kits

Madisound
8608 University Green
Box 4283
Madison, WI 53711
(608) 831-3433
 
 drivers, xovers, kits

Old Colony Sound Lab
P.O. Box 243
Peterborough, NH 03456
(603) 924-6371

 books, design software, electronic kits (xovers, amps, etc.)
 Speaker Builder and Audio Amateur Magazines


MCM Electronics
(800) 543-4330 catalog
 
 general electronic supply, tools, drivers, wire, caps & coils,
 assorted project supplies

Parts Express
(800) 338-0531 catalog
 
 like MCM


There is also a place called Mark V Electronics in Montebello (L.A.),
CA, but I forgot to bring in the address.  I can get it if anyone is
interested.  They have mainly amplifier kits of various flavors, I
haven't built one yet but plan to soon.

Bill
Newsgroups: rec.audio
From: bill@bilver.uucp (Bill Vermillion)
Subject: Re: 1-beam vs 3-beam
Organization: W. J. Vermillion - Winter Park, FL
Date: Sat, 29 Aug 1992 14:41:10 GMT

In article <1992Aug28.033343.8303@uniwa.uwa.edu.au> scott@psy.uwa.oz.au (Scott Fisher) writes:
>lstowell@pyrnova.mis.pyramid.com (Lon Stowell) writes:

>[stuff deleted...]

>...about complaints of people that argue...

>>    that 7 liter engines are faster than 3 liter engines, ad nauseum.

>They do don't they? :-)  

I had heard that the 3-beam design is cheaper to implement
that the one beam.
-- 
Bill Vermillion - bill@bilver.oau.org  bill.vermillion@oau.org
                - bill@bilver.uucp 
                - ..!{peora|ge-dab|tous|tarpit}!bilver!bill
From: znpt01@trc.amoco.com (Norman P. Tracy)
Newsgroups: rec.audio
Subject: Re: JBL speaker repair
Keywords: JBL
Date: 3 Sep 92 21:57:27 GMT
Organization: Amoco Production Company, Tulsa Research
Originator: znpt01@gpss43


In article <7490219@hpfcso.FC.HP.COM>, johnn@hpfcso.FC.HP.COM (John Nicol) writes:
> I have a pair of 20 year JBL Century speakers with foam grills.
> The speakers are in great shape but the foam grills are falling apart.
> 
> Does anyone have an current phone number or address for JBL?  I understand
> that they have been bought and sold many times over the years.  
> I assume that they are still in business.


JBL Consumer Products
240 Crossways Park West
Woodbury, N.Y.  11797
(currently owned by Harman Intl.)

Also try:
Speakerworks
4931 South Mingo
Tulsa OK.
(918) 664-6299
(800) 526-8879

Given the thousands of JBL and other speakers built in the '70s with foam
grills Speakerworks has made a national business out of replacement grills.
They have nice frames covered with grill cloth custom built to fit the most
popular JBLs.  I have heard (correct me if I'm wrong) that JBL does not have
replacement foam grills.  Which is too bad as the style of these classics
was based on their sculpted grills.  Also too bad how quickly the foam grills
and foam surrounds rot away (quickly in this case being a few tens of years!).
How lucky you are that JBL used rubber surrounds which do not rot.

Anyway, David Miller (owner of Speakerworks) lives and breathes old JBLs and
other classic Hi-Fi and he can fix you up.  They also recone speaker drivers.

trivia:  The no holds barred Willson Audio Watt system uses a thin foam grill.
I guess for $4500+ a pair you can afford to replace your grill foam every
ten years or so.

Norman Tracy (znpt01@trc.amoco.com)
Newsgroups: rec.audio
From: satish@cs.albany.edu (B. Satish Acharya)
Subject: SUMMARY
Originator: satish@abacus.albany.edu
Organization: The University at Albany, Comp. Sci. Dept.
Date: Thu, 3 Sep 1992 21:29:36 GMT


Hi,

I would really appreciate if some one could email me summaries 
(brand, price, features, comments) on surround sound amps, receivers, 
CD players, cassette decks and speakers.


Thanks,

Satish
------

satish@cs.albany.edu

Newsgroups: rec.audio
From: shiv@bnr.ca (Shiv Naimpally)
Subject: Re: question about speaker building
Reply-To: shiv@bnr.ca (Shiv Naimpally)
Organization: Bell-Northern Research Ltd.
Distribution: rec
Date: Wed, 02 Sep 92 17:28:28 GMT

There is a magazine called oddly enough _Speaker Builder_ (I think
it evolved out of the _Audio Amateur) which is devoted to speaker
building. Anyone have their address ?

Buy Stereo Review or Audio and check the ads in the back. There are many
speaker kits available, ie. they are pre-fab - you just put it together,
if you are looking for a 'paint-by-numbers' approach. I recently got a
catalog from Audio Concepts which has all kinds of speaker kits 
(including sub-woofers). Prices seem quite reasonable. They advertise
in Audio mag and I circled a reader service card to get the catalog.

There are also 'do it yourself' places that supply plans (you build
the enclosure) and drivers. I've seen their ads in the back of Audio,SR,
etc..
From: rg@futserv.austin.ibm.com (R.G. Keen)
Newsgroups: rec.audio
Subject: Re: How to cure mains leakage?
Date: 26 Aug 92 16:21:27 GMT
Reply-To: ...@cs.utexas.edu:ibmaus!auschs!tmn1.austin.ibm.com!tung
Organization: IBM Coporation - Advanced Workstations Division.

You have a serious safety problem. This leakage could under some
circumstances KILL someone.

You need to find out whether the leakage is the sum of all of the 
equipment leaking a little or one box with a defect. If one, fix
the defect. If it's the sum of all of them, the fix is a little harder.

Three wire equipment is much safer. If possible, get the equipment 
converted to three wire. You will likely have some hum problems, 
but these can eventually be overcome. A solid safety ground to 
every piece of metal you can touch is safest, whether this is by 
third wire or from bolting into a grounded rack. It may be possible
to add a safety ground wire separate from the mains cord to each 
piece of equipment, but that falls into the quick and dirty camp.

A good technical library will have books covering safety and 
signal grounding techniques, if you have access. If you do not
have the training and experience with electrical safety wiring to
modify the equipment safely, I strongly urge you to find someone
who does have this background to help.

R.G.
Newsgroups: rec.audio,rec.video
From: francis@cs.adelaide.edu.au (Francis Vaughan)
Newsgroups: rec.audio
Subject: Re: 1-beam vs 3-beam
Date: 27 Aug 92 07:55:29 GMT
Reply-To: francis@cs.adelaide.edu.au
Organization: Adelaide Univerity, Computer Science

In article <37272@sdcc12.ucsd.edu>, miliu@sdcc13.ucsd.edu (zaphod beeblebrox) writes:
|> I'm wondering, are CD players using single-beam lasers inherently
|> more prone to skip due to disc surface defects/bumping player than
|> players using three-beam lasers?  I think I read somewhere that the
|> two extra beams split off from the main one were used for tracking.
|> If this is so, this means that single-beams are inherently more
|> prone to skip.  Anyone have facts on if this is so/not so/opposite?


If anything the opposite.  Using a one beam design does not mean
that there is something missing from the player, or some
cost cutting, the terms simply reflect different designs of
the fine tracking systems.

The three beam uses seperate servo signals generated by the
outside beams to track the track.  The single beam design
superimposes a small AC signal onto the drive for the
tracking servo, this results in a modulation of the signal
in the detector stage.  The phase relationship of this modulation
relative to the origional signal superimposed onto the drive 
servo reflects the amount that the beam is off track and in 
which direction.  Hence a feedback signal is derived.

Both systems work.  It does seem that the one beam approach
is perhaps slightly more immune to tracking problems.  I like
the one beam design, it is very neat, very elegant.



					Francis Vaughan
From: u2zj@vax5.cit.cornell.edu (Stanton)
Newsgroups: rec.audio
Subject: High End spkr cables for sale
Date: 2 Sep 92 12:10:16 EDT
Distribution: rec
Organization: Cornell University

Tara Quantum III speaker cable - $85

7' pair, terminated in spades.

Friend of mine says bass improved dramatically when he switched
to Quantum III from Monster Cable.  I won't swear by that claim,
but certainly if the psycho part of your psychoacoustics is sagging,
these babies are for you.  They're as fat as garden hose.

I'm selling because I need longer cables.

Stanton Loh
u2zj@vax5.cit.cornell.edu
(607) 277-8000
From: dcha@flex.com (Douglas Cha)
Newsgroups: rec.audio
Subject: Bose AM-7
Date: Tue, 01 Sep 92 20:34:40 HST
Organization: Flex Information Network [Hawaii] 808.531.3539

        I've heard the Bose AM-5's and were impressed despite the
price tag of like $649.  The AM-7's are priced at $899 (?) but I
haven't heard what it'd sound like in a good surround setup.  Does
anyone have any comments on the AM-7's or the AM-5's at that?
        What kind of rear surround speakers would be a good match if
I did spend (oh my..) $899 on these..  (And please don't say that the 
$649 AM-5's would be the best match!:).

        Am-7's..  are they worth it??

-------------------------
   "The people of Earth only think of themselves.." -Char Aznable UC093
      "One man can't presume to judge mankind"  -Amuro Rei UC0093
                Doug Cha       dcha@flex.com   GEmail D.Cha1
From: ek1i+@andrew.cmu.edu (Eugene Kuo)
Newsgroups: rec.audio
Subject: Cheap CD players
Date: 27 Aug 92 00:49:21 GMT
Organization: Carnegie Mellon, Pittsburgh, PA


First, I apologize for the complete generalizations that I will make in
moment, but where can I get a cheap DiscMan CD player?  I define cheap
as less than around $120.  I guess Sony is the most popular models
around, or are there some that have better quality for the money, or
what?  Please educate me.  And include numbers for any mail-order places
as well.  Thank you, and I'm sorry if this has come up before in the
near past, but I just recently started reading this.  Thanks in advance!

        eugene
From: MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham)
Newsgroups: rec.audio
Subject: Re: How to cure mains leakage?
Date: 27 Aug 92 01:45:52 GMT
Organization: La Trobe University
X-News-Reader: VMS NEWS 1.22

In <5085@gold.gvg.tek.com> chrisc@gold.gvg.tek.com writes:

> In article <1992Aug26.073100.24942@nuscc.nus.sg> isclyhb@nuscc.nus.sg 
> (Benjamin Lian) writes:
> >I have a bunch of hifi gear, a keyboard, and a rack full of sound
> >modules and stuff running of the same mains outlet (via powerboards of
> >course).  Most (if not all) of the equipment is not earthed.  I suspect
> >that this is causing low-level leakage of some a.c. to all the chassis.
> >As a result I have to move very gingerly around the equipment otherwise
> >I get zapped if I touch anything live.  There is not much to worry about,
> >but enough so that it is not pleasant.
> 
> >Would some kind soul *please* *PLEASE* tell me how to stop my audio gear
> >from behaving like a cattle prod.
> 
> I do not know exactly what the mains power situation is in Sinapore so
> I will make an assumption that it is similar to British power where
> you have a hot lead (at 220VAC) an common lead and a (saftey) ground
> (where used).
> 
> Your equipment is just two wire which I am assuming is common and hot.
> 
> If all the above it true than there is only one (well maybe more
> but..) reason you have "hot" chassis's...A fault in the equipment,
> leaky mains bypass caps, wiring error in "powerboards" or in the mains
> connection that you plug into (let's see that was 4! reasons).

Sorry, I cant agree with this.
It is quite common to have capacitive coupling between the primary and
secondary of power transformers. The result is that the secondary centre tap
runs at about 1/2 mains potential. I've used a DVM to measure a leakage current
of about 50uA through a 600VA Toroid. Toroids are particularly bad because
they dont usually have an electrostatic shield
between the windings as in EI core transformers.
You could try earthing them, either back to a bus bar, or via 100 Ohm resistors
separately using 3-prong plugs.
Graham B
Newsgroups: rec.audio
From: serge@dgbt.doc.ca (Serge Ah Hee)
Subject: Re: Acoustic studio monitors?
Organization: The Communications Research Centre
Date: Thu, 3 Sep 92 17:59:02 GMT

In article <1992Aug31.175134.9497@bmerh85.bnr.ca> shiv@bnr.ca (Shiv Naimpally) writes:
>Thats amazing ! We have the same scam running in Ottawa. These guys
>go around in a van (they even have valid vendor's permit to sell out
>of the van) and give the impression that they have 'hot' speakers they
>want to sell cheap. Even the name is the same 'Acoustic Studio Monitors' !
>A friend was approached once and called the cops thinking the speakers
>were hot and was told they were legit !
>
>For $200 you could have got some used speakers that will blow the 
>transducers off of your Acoustic Studio Monitors ! 

Ha Ha Ha Ha! A classmate bought a pair at the University of Ottawa's parking
lot! He paid, you would not believe it... 600$ Ha ha ha ha ha  arf arf ha ha

-- 
Serge Ah-Hee                  "Most troubles come from the fact that people 
serge@dgbt.doc.ca		take for granted of what they have, and 
				only care for what they want."
My opinions are mine only.
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: 1-beam vs 3-beam
Date: 31 Aug 92 21:04:01 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA
Originator: daemon@sword.eng.pyramid.com

In article <1992Aug29.144110.12497@bilver.uucp> bill@bilver.uucp (Bill Vermillion) writes:
>
>I had heard that the 3-beam design is cheaper to implement
>that the one beam.
   
   Allegedly true.  And the fact that the number "3" is bigger than
   a "1" allows marketing literature to convert a vice into a
   feature.   

   My understanding was that the good 1 beamers required expensive
   hand alignment of the optics.....and hand labor is notoriously
   expensive and unreliable.  

   It'll probably lead to the reverse-snobbery rampant in the audio
   markets....some will advertise 1-beam assemblies, not because
   they are any better inherently, but to appeal to the "true
   cultists".  

   And the inevitable 1-3 wars on rec.audio... >:-)
Newsgroups: rec.audio
From: baileyc@ucsu.Colorado.EDU (Christopher R. Bailey)
Subject: Need help with Philips FT-50 Tuner
Organization: University of Colorado, Boulder
Distribution: usa
Date: Sun, 30 Aug 1992 18:39:23 GMT

I just bought a Philips FT-50 Tuner used, and they didn't give me a manual.
I just wanted to know what all the functions of the FM Mode button is.  Alos
for the IF Band button, I realize that is narrow or wide range, but when it's
on which is it?  

For example, when do I use Auto/Stereo mode and is there any other modes, etc.

If it matters I have it hooked up through my cable TV system (I don't think 
there is any other way with this tuner).

Newsgroups: rec.audio
From: scott@psy.uwa.oz.au (Scott Fisher)
Subject: Re: 1-beam vs 3-beam
Organization: University of Western Australia
Date: Fri, 28 Aug 1992 03:33:43 GMT

lstowell@pyrnova.mis.pyramid.com (Lon Stowell) writes:

[stuff deleted...]

...about complaints of people that argue...

>    that 7 liter engines are faster than 3 liter engines, ad nauseum.

They do don't they? :-)  

Scott.
Xref: sparky rec.audio:11796 rec.video:10550
From: fontana@orange.cis.ohio-state.edu (Mark Fontana)
Newsgroups: rec.audio,rec.video
Subject: Re: A/V Prologic Receivers--FULL SUMMARY! [LONG]
Keywords: av prologic receivers summary audio video surround
Date: 25 Aug 92 23:54:26 GMT
Organization: The Ohio State University, Department of Computer and Information Science


Could someone who owns one of these high-end surround decoders explain
something for me:  What the heck is a "70mm" surround mode?

Is this a gimmick mode to supposedly give channel separation rivaling
6-track 70mm motion picture film?  Does assigning a preset this name
really impart the larger-than-life superlatives associated with the
70mm film format?  Or is it an image enhancement mode as well; Is it
supposed to bring breathtaking picture clarity to the 40-year-old NTSC
standard?  

Sure you can extract the difference of two channels and get a monophonic
surround channel, and perform some signal processing to determine
where left and right are the same, building a center channel.  But going
beyond this is really pushing it... How is it possible to get discrete
left and right surround channels?  I've read the surround FAQ, but it
doesn't get into the Dolby A encoding process.
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: 1-beam vs 3-beam
Date: 27 Aug 92 20:18:33 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA
Originator: daemon@sword.eng.pyramid.com

>In article <37272@sdcc12.ucsd.edu> miliu@sdcc13.ucsd.edu (zaphod beeblebrox) writes:
>
>> I'm wondering, are CD players using single-beam lasers inherently
>> more prone to skip due to disc surface defects/bumping player than
>> players using three-beam lasers?
>
In article <23552@alice.att.com> ark@alice.UUCP () writes:
>There was an article in AUDIO magazine about this a while back.
>They talked to several engineers who had actually worked on the
>design of commercial CD players.  Their consensus was that there was
>no difference between a well-designed one-beam system and a well-designed
>three-beam system, but the public thought three beams were better so
>they were under corporate pressure to design three-beam systems.
    
    Under pressure by the very same folks and buyers who laugh 
    disdainfully during the Spinal Tap movie when someone alleges
    that an amplifier numbered to 11 is louder than one which only
    goes up to 10.  

    Or in the techie community folks who swear that a 10 Mbps
    Ethernet is always faster than a 4 Mbps Token Ring.....

    Or people who swear that 3 head decks are always superior to
    2 head decks, or 3 motor decks are always superior to 1 motor
    decks, or that 2-way speakers are always superior to 1 way
    speakers, or that 4 times oversample is superior to 2 times
    oversample, or that 7 liter engines are faster than 3 liter
    engines, ad nauseum.

    Basically just the "speedometer" mentality at work.  Unable to
    understand the technology involved or just too intellectually
    lazy to stop and think, an unfortunate number of
    buyers "go for the highest number".  Meanwhile in all these
    examples SOME products/widgets of one type are superior to SOME
    products in the other.  The implementation is almost always
    superior to the architecture.  [Unless you're comparing tincans
    and string to ISDN...and even then I wouldn't care to put money
    on either implementation without qualification...]
Newsgroups: rec.audio
From: shiv@bnr.ca (Shiv Naimpally)
Subject: Re: Bose AM-7
Reply-To: shiv@bnr.ca (Shiv Naimpally)
Organization: Bell-Northern Research Ltd.
Date: Wed, 02 Sep 92 17:36:41 GMT

My sister was looking at the AM5s and I suggested she check out Cambridge
Soundworks Ensemble. She bought the latter and found them to be
better sounding than the Bose and a lot cheaper too ! You could probably
get 4 satellites and 2 subwoofers for $899 from Cambridge !
The 2 satellites and 2 subs go for $399 I think. They have gotten 
excellent reviews. Since they are only sold via mail order they come
on 30 day trial. If you don't like them after 30 days you can send them
back for a refund.

Note that I don't work for Cambridge or anything - my sister and brother
in law are very happy with their speakers.
From: deanc@hpdmd48.boi.hp.com (Dean Cashen)
Date: Wed, 2 Sep 1992 16:26:14 GMT
Subject: Re: Bose Acoustic Cannon
Organization: Hewlett Packard - Boise, ID
Newsgroups: rec.audio


   Perhaps 6 or 9 months ago, Audio magazine had a writeup on 
the Bose canon.  It provided some detail on the research
and design, although I don't recall now just how much.  I
do seem to remember they withheld specific data in some
cases, just so people wouldn't buy concrete pour tubes
and stuff some speakers inside.  

  If anyone's interested, I'll find which issue it was
and look more closely at the details provided.

Dean Cashen
-- Boise

hpdmlcd.boi.hp.com
From: dam@dcs.glasgow.ac.uk (David Morning)
Newsgroups: rec.audio
Subject: Re: Tubes
Date: 28 Aug 92 16:16:54 GMT
Organization: Glasgow University Computing Science Dept.

collin@angelo.amd.com (Collin K. Ong) writes:

>Anybody have ideas as to where I could get large diameter, thick walled
>tubes made or cardboard, wood, etc.?  I would like about 15" diameter.
>I'm thinking of making a sub similar in design to the Hsu Research one.
>Hardware stores?  Construction sites? ???

Try plastic drainage pipes from a builders merchant. The underground type
come in pretty big diameters.

Dave
--
From: denio@seismo.CSS.GOV (Dennis O'Neill)
Newsgroups: rec.audio
Subject: Re: Where can I find the Nyquest theorem
Date: 26 Aug 92 19:11:17 GMT
Organization: Institute for Obfuscatorial Dynamics

>In article <1992Aug25.200552.12909@fcom.cc.utah.edu> dave@news.ccutah.edu (dave martin) writes:
> Where can I find the exact statement of the Nyquest theorem?  I have seen
> some articles attributing certain properties of digital audio to the Nyquest
> theorem which happen to be false.  I am trying to find out if the theorem
> is in error (unlikely) or if the author of the piece I read is wrong (more
> likely).
> 
> dave@csulx.weber.edu
> DMARTIN@CC.WEBER.EDU

Try "Fundamentals of Digital Audio" by Ken Pohlmann (sp?).
-- 
Dennis O'Neill (denio@seismo.css.gov)
From: DPierce@world.std.com (Richard d Pierce)
Subject: Re: How are speaker impedences specified?
Organization: The World Public Access UNIX, Brookline, MA
Date: Thu, 3 Sep 1992 12:48:04 GMT

In article <1992Sep02.171943.7402@bmerh85.bnr.ca> shiv@bnr.ca (Shiv Naimpally) writes:
>I should have also pointed out that the impedance charts are impedance
>vs frequency - they go in the lab, squirt frequencies in and measure
>the impedance. Meanwhile back at home you are playing music which has
>many frequencies - who knows what the impedance is !
>
>My point is that impedance figures are just numbers the manufacturer
>conjures up based on some data (data that is arrived at under
>conditions you will never have in your home). Its a 'guide' and should
>not be taken to be absolute.
>
>If you are matching speakers to an amp, hook them and listen to them
>and trust your ears and not some data the manufacturers give you !

Might you enlighten us (in general) and me (in particular, since I've only
been doing this for twenty years or so, and don't have a clue as to how one
determines impedance by listening).

I measure the impedance of drivers and speaker system often 10 or 20 times
a day on a very regular basis (these manufacturers of which you speak are
willing to pay me lots of money to do that). I have a fairly extensive set
of equipment here that I plug drivers into and out comes impedance curves.
A lot of it I designed and built myself.

Up until this point, I was under the impression (which you seem to be willing
to cast doubt upon) that the numbers I was getting were based on some real
physical phenomenon. I had never considered the possibility that my equipment
was "conjuring" numbers. If that's true, can I get it to "conjure" other things
like rabbits, money or happiness :-).

All that aside, just what the hell are you talking about?

.
-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |