HDTenEightyP/NetNews huggingface dataset:
Newsgroups: rec.audio
Date: Mon, 6 Apr 1992 22:26:36 -0400 
From: "Robert W. Igo" <ri09+@andrew.cmu.edu>
Subject: Low range

What *is* the low range of human hearing, anyway?  Is there one?  I'm speaking
of Hz, not dB.  I keep thinking of that poster who mentioned the 16Hz pipes
on the pipe organ CD, and wondering exactly how low that is.  Obviously, if
the information is accurate, we can at least hear down to 16 Hz, or else no one
would have invented that particular pipe.

--Bob
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"Make it sew." --Captain Jean-Luc Picard | "I'm very dangerous when I don't

"It ACTUALLY worked...."                 | know what I'm doing...."

--Colin Baker as Dr. Who                 | --Tom Baker as Dr. Who

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"Like I've always said: There's nothing an agnostic can't do if he really 

doesn't know whether he believes in anything or not." --Monty Python


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From: pschauer@den.mmc.com (Paul Schauer 1-1090)
Newsgroups: rec.audio
Subject: Re: Sherwood?
Summary: FLAME! Go ahead, flame back.
Date: 15 Apr 92 15:03:18 GMT
Organization: Martin Marietta Astronautics, Denver

In article <1992Apr15.034549.28667@uniwa.uwa.edu.au> gunter@uniwa.uwa.edu.au (Gunter Ahrendt) writes:
>markw@hpcss01.cup.hp.com (Mark Williams) writes:
>
>>Like Marantz, Harmon Kardon, Fisher, Crown, and Scott, Sherwood
>>was an old respected American firm which withered under the Japanese
>>onslaught in the early 1970s.  Mostly the names were picked up in bankruptcy
>>court by the Japanese multinationals.  Sherwood gear today is made in Korea,
>
>No your very wrong here.
******
No, my friend, you are (contraction: you're, not your) very wrong here. 
******
>
>Marantz is owned by Philips and always was.
>Harmon/Kardon is German and still is and always was.
>but

Marantz was formed by Mr. Saul Marantz in the '50s. In the late '60s/ early
'70s Marantz was bought out by SuperScope, which was believed to be a 
distribution arm of Sony in the US.
Messrs. Harmon and Kardon were an engineer and finance type (not sure which was
which) who opened up shop in Chicago in the '50s as well. H/K was recently 
bought by JBL, which was at one time the James B. Lansing Co.  No detailed 
history of the acquisition activity over the last 10 years, however.
The last "old guard" American hi-fi company to sell out to the Asians
 was McIntosh.  They
became a subsidiary of Clarion about one year ago.  They had been making
amplifiers in Binghamton NY since Frank McIntosh founded the company in
1949.  
This data is obtained from a personal memory dump and may not be 100%
accurate.  The opinions expressed are those of the individuals named, not
our employer.
CJ Rabe, III
From: 2frlclover@kuhub.cc.ukans.edu
Newsgroups: rec.audio
Subject: Re: Rotel info
Date: 11 Apr 92 09:53:41 CDT
Organization: University of Kansas Academic Computing Services

In article <1992Apr9.160849.19042@ux1.cso.uiuc.edu>, chojnows@osiris (Brian Chojnowski) writes:
> I have two products that I have bought used and would like the manuals for.
> Rotels TCD-855 and RA-500. Does anyone have the address for Rotel that I
> could write to to obtain this information?

ROTEL
P.O.BOX 653
Buffalo,
N.Y. 14240




Mike
Newsgroups: rec.audio
From: paul@gaitlab1.waterloo.edu (paul j guy)
Subject: Re: Anyone successfully using Jordan 50mm drivers?
Summary: not really suitable for bass
Keywords: Jordon speakers
Organization: University of Waterloo, Waterloo,Ontario
Distribution: na
Date: Tue, 7 Apr 1992 12:46:21 GMT

In article <1992Apr6.202026.6536@mercury.cair.du.edu> troby@diana.cair.du.edu (Thorn Roby) writes:
>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).
>-- 

 I managed to get hold of a pair of these, but I measured the impedance as 
a function of frequency. There was a pronounced peak around 500-600 Hz. This
I suspect, was the the fundamental resonance, so I made up the crossover
to cut off at 1.5 kHz (these were obviously tweeters). They showed very
consistent impedance from 1 kHz up, their effective equivalent circuit was
about 6 ohms in series with about 30 microhenries if I remember rightly...
 They were never driven very hard (10 watt tube amp), and had a somewhat
metallic sound that was great for jazz, but not so hot for classical music
(IMHO). The dispersion wasn't the greatest, but from what I understand,
you should be using several of these units, and should aim them slightly
away from each other.
 In short.... don't use these speakers for low frequencies, besides, their
radiating surface is too small, unless you use them for headphones.

-- 
-----------------------------------------------------------------------------
Paul J Guy			work phone:519-885-1211 ext 6371  
paul@gaitlab1.waterloo.edu	home/FAX/message:519-576-3090
pguy@watkin3.waterloo.edu	..remember...bullshit baffles brains...
From: btdy@vax5.cit.cornell.edu
Newsgroups: rec.audio
Subject: Re: Opinion on Cambridge Soundworks Ensemble
Date: 13 Apr 92 22:15:39 EDT
Distribution: rec
Organization: Cornell University

In article <1992Apr11.005148.19508@leland.Stanford.EDU>,
bosco@leland.Stanford.EDU (Eric Bosco) writes: 
> Hi, I'm think of changing my speakers to mostly to space and aesthetic 
> considerations and I was looking into subwoofer-satellte systems. I 
> wanted to know if anybody had any opinions on the Ensemble. Specifically:
> 
> 	1- Is this a  good speaker system?
> 	2- What is the difference in sound between the Ensemble II and
> 	   the Ensemble? Is the extra $100 dollars worth the fact of having
> 	   separate subwoofers?
> 	3- Finally, how does it compare to more expensive systems: Bose,
> 	   Polk, Infinity etc. I like the ensembles low price, but I would
> 	   not want to sacrifice much in the way of sound quality.
> 

I've got a set of Polk RM3000's.  I paid $700 for the set a year ago (and
got $100 of monster cable tossed in for free) from Sound Advice in Sarasota,
FL.  They had six or seven satellite systems, but not the Ensemble.  I 
listened to 3 Bose systems (one older generation and two newer ones).  All
of them did not sound flat.  One has some odd mid-bass resonance even after
I moved the woofer module around some (oops--had).  The infinity system
and the Bose systems did not have the imaging or depth of the Polk system.

The woofer module has a unique two-chamber design with 2 active drivers and
a passive radiator on the bottom--air suspended system.  It makes really
tight bass--great for jazz.  It also has a nice feature: each of the three
speakers has its own crossover, so you don't have to worry about wiring
the satellites directly to the woofer, like in the Bose systems (this may
have changed).

I also compared a dozen or so other paired systems in the <$1000 range.
None of them had the imageing or frequency response of the satellite
system.  The list included (all 2-way) Polk, infinity, Bose, Boston
Acoustics, Acoustic Research, and Klipsch.

Happy shopping!

"Getting it clearly through alternate paths, or mixed in with the signal
 you're sending..."

- Jeff

Newsgroups: rec.audio
From: al@qiclab.scn.rain.com (Alan Peterman)
Subject: Re: Does class D exist?
Organization: SCN Research/Qic Laboratories of Tigard, Oregon.
Date: Mon, 13 Apr 1992 00:50:28 GMT

In article <1992Apr12.204853.20421@cunixf.cc.columbia.edu> reha@cunixf.cc.columbia.edu (Reha Elci) writes:
>  I once read about the design of a Sony amplifier which was actually marketed
>in the US in the early 80's or even earlier that called itself class D. It
>had a pretty interesting design. What is the exact definition of class D?
>Does it really exist? If so, has anybody seen examples of them? Thanks

Infinity marketed a class D amp called the "DSP Switching Amplifier" in
1977 to 1981.  It was rated at 250 WPC into 8 ohms and consisted of
three sections; a 2000 watt power supply, switching amplifier modules, 
and smoothing and averaging ection.  Interestingly it was rated to run
on 100-240 volts AC at 50-400 hertz.  Oh yes, it cost $2000.  


-- 
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!
Newsgroups: rec.audio.car
From: secole@lims02.lerc.nasa.gov (TONY COLEMAN)
Subject: Re: DSP for automatic Volume Control
News-Software: VAX/VMS VNEWS 1.41    
Organization: NASA Lewis Research Center
Distribution: usa
Date: 15 Apr 1992 08:12 EST  

In article <3735097@tronix.SignalPath.on.ca>, louis@tronix.SignalPath.on.ca (Louis Bertrand) writes...
>stanbach@apple.com (Francis Stanbach) writes:
>> Does anyone manufacture a car stereo with a DSP that automatically
>> changes the volume of the music depending on the noise inside the car.
>> You install a microphone near the headrest and the system plays music
>> through the speakers to adjust focus.
>> 

Hi,

Pioneer makes a unit the KEX-M900 (list $1200) that has the feature that 
you descirbe.  In addition it loaded with more features than any other unit 
presently made.  There is a review of the unit in the Dec 91 issue of Audio 
magazine.

Later,

Tony
Newsgroups: rec.audio.car
From: jreiser@scott.skidmore.edu (jason reiser)
Subject: Re: Going Through the file wall
Organization: Skidmore College, Saratoga Springs NY
Date: Thu, 16 Apr 1992 19:44:53 GMT

dsg6397@cs.rit.edu (David S Greenberg) writes:
> 
> 	I was wondering if anyone knows:  Is there some trick to routing
> power / ground cables from the engine compartment through the fire wall
> and into the car interior. I spend a long time trying to find an existing
> hole big enough to route 2 10 ga. cables through. I ended up drilling a 
> hole (what a bitch!!!) and worrying about hitting something important.
> 	It ended up working out ok, but I figure there must be an easier
> way!
> 
> 						Dave
> 

The only trick I know is this:
	When you are deciding where to make a whole, consider doing it
adjascent to the hood release.  There is rarely anything blocking
access to it and you should be able to see both sides of the area
before drilling.  There are lots of great rules and guidelines, but
some cars are just a bitch... Porsche 911's come to mind...

				- Jason Reiser
 
 
  /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
  \                                                            /
  / Jason Reiser  Skidmore College, Saratoga Springs, NY 12866 \
  \            E-Mail at jreiser@scott.skidmore.edu            /
  /                    Or Call 518-581-7079                    \
  \                                                            /
   \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
From: gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON)
Newsgroups: rec.audio.car
Subject: Re: who makes what in the car audio world...
Date: 17 Apr 92 15:32:57 GMT
Organization: Georgia Institute of Technology

In article <p-l+YxB@engin.umich.edu> bladex@engin.umich.edu (Robert Klingsten) writes:
>Add "Crutchfield amps" to the list.  Those are also made by Precision

This seems like a good time to make a few additions:
As Louis B mentioned to me, Sansui ampse (ie, sm1500,sm3000, etc) are 
also PPI. However, the NEW crutchfield amps seem to be different.(not PPI?)

Also , Orion apparently makes Bolt amps, too.

And- Lanzar amps are made by Zed, like the HiFonics.

And a correction: the Earthquake and Audio Tech (NOt AUtotek) amps are
based on the older HiFOnics deisgns, NOT the new stuff, and are not
actually assembled by Zed. But, they are still basically the same.

and speaker additions: Fultron woofers are made by Credence, and are
the same basically as the older (pre Uniplate) Kickers.

HiFOnics tweeters are MB Quart, but are the home type, not quite the same
as the QM series.

Some Soundstream mids are Vifa. (5", etc)

Many Sony  and AR car speakers are basically the same. If they look the
same, they pretty much are.

HiFonics cast-frame woofers are made by Gauss, and are the same basically
as the old Orion GS stuff.

If I recall any more stuff, I will make additions at that tims. Meanwhilw,
please, any contributions are welcome!

Regards,
Gordon.


-- 
WATERS,CLYDE GORDON-Georgia Institute of Technology Atlanta Ga 30332 
******<LANGUAGE IS A VIRUS! - Laurie Anderson-Home of the Brave>******* 
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt0869a
Internet: gt0869a@prism.gatech.edu
Newsgroups: rec.audio.car
From: frank@owlnet.rice.edu (Franklin Tae-Sung Kang)
Subject: New Infinity Amps
Organization: Rice University
Date: Fri, 17 Apr 1992 06:08:14 GMT



Anyone hear about the new Infinity amps?  They will be Class D and
are touted to have >80% efficiency (that means smaller power supply,
smaller heat sink area, smaller package for a given power).  Class
D from what I read is a direct digital switching amplifier.  I
recall that Sony used to make such a home amp - but it was not
very popular and was discontinued.  That was a while ago though,
maybe Infinity has come up with some improvements.

The concept is great, but I have a feeling the sound quality is
not going to be on par with the better Class AB amps for a while.

Frank
-- 
Frank T. Kang-------------------------------------------------frank@rice.edu
"...if there was a doubling of the current engineering enrollment-the growth 
rate of the economy would rise 0.5% a year.  By contrast, if law school
enrollment doubled, the growth rate would fall 0.3% annually."  BW 4/6/92
From: gary@rocker.ingr.com (Gary Braswell)
Subject: Re: Honda factory radio comments? Problems?
Reply-To: gary@rocker.b11.ingr.com
Organization: Intergraph Corporation
Date: Wed, 8 Apr 1992 16:34:22 GMT

> 
> In article <1992Apr02.181216.14665@fwhnm02.fwrdc.rtsg.mot.com> rlatham@fwhnm02.fwrdc.rtsg.mot.com (Russ Latham) writes:
> >I recently purchased a 1992 model Honda, and it came with
> >
> >I have noticed that the reception is sometimes not very good
> >with the radio. 
> >And that the frequency response of the music (from the radio)
> >is also not very good.
> >BUT - the tape player sounds excellent. 
> 


	I have recently purchased a used 1987 Civic, and one of the things
	I LOVED about the car was the fact that the tape deck sounded awesome
	(for a factory stereo).  A friend of mine had stated that he had
	heard that Alpine makes the tape players for Honda (but you can
	take that with a grain of salt).

	HOWEVER, as it would turn out, the day after I bought the car
	the tape deck started flaking out on me.  I would stick a tape
	in, and the deck would barf it back out (maybe it doesn't like my
	music :-).  I figured out a way to make it stay:

	   Push the eject button while you are inserting the tape, and
	   generally it will accept it.

	Now, I realize that my experience is proabably not the norm, and
	it *is* with a 5 year-old car, but I thought you might find it
	interesting.

	FYI,


	Gary B.

/*****************************************************************************/
 "I can see how it might be possible to look | Gary Braswell, Sr. Sys. Engineer
  down upon the earth and be an atheist, but | Intergraph Corporation
  I cannot conceive how he could look into   | gary@rocker.b11.ingr.com
  the heavens and say there is no God."      | Engineering Dept.
 --- Abraham Lincoln			     | PH. 730-6497, MS CR1105
/*****************************************************************************/
From: hlh5721@zeus.tamu.edu (HENDRIX IS GOD)
Newsgroups: rec.audio.car
Subject: Re: Best Head Unit for under $200?
Date: 7 Apr 92 05:43:00 GMT
Organization: Texas A&M University, Academic Computing Services
News-Software: VAX/VMS VNEWS 1.41

In article <1992Apr6.160139.25582@eff.org>, peterco@eff.org (Peter A. Cohen) writes...
>Please give me your opinions- what's the best full-featured head unit for under
>2 bills?
> 
>- Peter

I just got a Blaupounkt (spelling?) Nashville from crutchfield on sale for $199
I think that they are trying to get rid of them....It has full function tape
deck, 25wX2 or 7.5X4 output....rca outputs...cd changer controls...full function
fader....music search...reverse....dolby....chrome.....etc.   It has it all
at a good price!

I also got the 12 cd changer that it controls for $300 making the total for
a very good sounding system $499.00.  If you are interested you better hurry
because i think that this is a limited supply item

Later



LEE HUDDLESTON,                 
Texas A&M University,
College St. TX

"This views expressed are mine and are not necessarily those of
  Texas A&M University, its faculty, staff nor students"
Organization: Sophomore, Math/Computer Science, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.audio.car
Date: Wed, 15 Apr 1992 00:09:16 -0400 
From: "Robert W. Igo" <ri09+@andrew.cmu.edu>
Subject: Re: VOLTAGE CONVERTER

A resistor?  E = I * R, right?  Doesn't that mean that a resistor will only
change the current?  Isn't that why they build transformers to convert voltage?

(Please, this is not a flame, Mitch.  I'm not sure myself, or else I wouldn't
be asking.)

Try to avoid getting technical information from Radio Shack.  With my amp
taking any small electrical interference and amplifying it, I asked some
guy at Radio Shack what could be done, and he said the only thing that could
be done is to buy one of their noise suppressors (which is a bunch of wire
wrapped around some metal, essentially an odd electromagnet) for about $25.00
or so.  All they will tell you is "buy this."  Of course, in this situation,
you might be better off going to them, since you know what you need.

--Bob
Newsgroups: rec.audio.car
From: mrubino@engws1.ic.sunysb.edu (Michael N Rubino)
Subject: Questions on Damping factors
Originator: mrubino@engws1.ic.sunysb.edu
Organization: State University of New York at Stony Brook
Distribution: na
Date: Tue, 14 Apr 1992 18:08:34 GMT

I have a HiFonics Jupiter which is rated at 4x30 into 4ohms with a damping
factor of 100.  I have the amp bridged to 2x100 into 4ohms driving a Lanzar
HF6000 box mounted in my hatch.  The box is ported and consists of 2 10"
woofers and 2 Piezo mid-tweets.  My first question is;  What is the
approximate damping factor of this amp at 2x100?  Is is greater than, less
than, or equal to 100?

I am considering upgrading to a HiFonics Thor which is rated at 2x125 into
4ohms with a damping factor of 250.  My second question is;  Would this make
a noticable difference in sound quality?  Would I get "tighter" bass?  I know
ported enclosures are "boomier" than sealed ones.  I'd like to keem the "boom"
to a minimum.

Thanks in advance,

    Mike
    
Newsgroups: rec.audio.car
From: biancol@bullet.ecf.toronto.edu (BIANCOLIN  FABIO S)
Subject: Autotek Amplifiers?
Summary: Has anyone had any experience with them? 
Organization: University of Toronto, Engineering Computing Facility
Distribution: na
Date: Fri, 10 Apr 1992 04:15:31 GMT

  Hi there
	just curious, i was at this dealer recently, and he tried to
convince me that Autotek Amplifiers were completely awesome.
  
   He said "I would easily put this in the same class as Phoenix Gold Amps"
 
    Thats a direct quote, what i want to know since i saw the post
made by Clyde Waters (the list of components, and makers) 
   How good are these amps?  Do competition Cars use them? 
   Are they available all over?  What are they worth?
  Can they handle 2 ohm loads (mono and stereo?)?
  
   Thanks,
  
 	Fabio  - biancol@ecf.toronto.edu
From: mt2m+@andrew.cmu.edu (Michael James Tester)
Newsgroups: rec.audio.car
Subject: Speaker Builder Mag.
Date: 13 Apr 92 20:38:52 GMT
Organization: Freshman, Physics, Carnegie Mellon, Pittsburgh, PA


    I have heard of Speaker Builder Magazine several times and was
wondering if anyone knew where I could write to order it. Thanks for the
help.


                                            Michael Tester
From: goodnuff@beam.Princeton.EDU (David W. Goodnuff)
Newsgroups: rec.audio.car
Subject: car upgrade help needed
Date: 14 Apr 92 20:47:01 GMT
Organization: Princeton University
Originator: news@ernie.Princeton.EDU

Hello, I just got a new car that has a pretty good radio.
Unfortunately, it does not have a cassette deck.  Does anyone have any
ideas of any way that I could hook up my walkman to the car speakers?
I guess that I would have to go inside and manually attach the headphone
output to the speakers... Thanks.


-=|=- -=|=- -=|=- -=|=- -=|=-
-David Goodnuff-
goodnuff@phoenix.princeton.edu
From: gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON)
Newsgroups: rec.audio.car
Subject: Re: where to fix a fosgate
Date: 6 Apr 92 14:05:39 GMT
Organization: Georgia Institute of Technology

In article <69836@ut-emx.uucp> baylor@ccwf.cc.utexas.edu (Baylor) writes:
>set to four). The place i got it said that fosgate doesn't give
>out their schematics, so no one can fix them (except fosgate, of
>course, but i'd have to mail it in).

This is very true, for the new HD stuff. Even if you could get the schematic,
you would be hard pressed to fix it due to the mass amount of stuff in the
giant HD chips (all the low-level circuitry) I have decided that the whole
HD thing is a ploy to get more return business for Fosgate, re repairs (1/2
:-) here). It doesn't sound any better, but it probably does reduce the
assembly cost, and is completely impervious to repairs by normal means.

Regards,
Gordon.

-- 
WATERS,CLYDE GORDON-Georgia Institute of Technology Atlanta Ga 30332 
******<LANGUAGE IS A VIRUS! - Laurie Anderson-Home of the Brave>******* 
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt0869a
Internet: gt0869a@prism.gatech.edu
Newsgroups: rec.audio.car