HDTenEightyP/NetNews huggingface dataset:
From: gilchr@ee.ualberta.ca (Andrew Gilchrist)
Subject: Re: Crossovers in series
Organization: University Of Alberta, Edmonton Canada
Date: Tue, 17 Nov 1992 22:31:32 GMT

jsc52962@uxa.cso.uiuc.edu (Jeffrey S. Curtis) writes:

>I currently have a two-way crossover splitting my front channel between
>5 1/4"s in the doors and 3 1/2"s on the dash.  The signal is crossed at
>2.5kHz.  I'd like to filter below 200Hz on the woofers as well, and have
>two 200uF caps which could accomplish that task.  My question is this:
>will putting these two passive crossovers essentially in series with
>one another do any strange, undesirable things to my signal?

>Thanks,
>Jeff

Not especially.  This situation is not ideal, but you should be fine.

Andrew
Newsgroups: rec.audio.car
From: znpt01@trc.amoco.com (Norman P. Tracy)
Subject: Re: 1 Farad Capacitor availability
Originator: znpt01@gpss43
Organization: Amoco Production Company, Tulsa Research
Date: Tue, 17 Nov 1992 19:29:00 GMT


In article <26130110@hpcc01.corp.hp.com>, kirk@hpcc01.corp.hp.com (Kirk Lindstrom) writes:
> >   Right now i'm looking in the new Pasco Scientific Physics catalog and
> >they have for sale a 1 farad capacitor for roughly $19.00.
> >The problem is is that it is a 5 volt and not a 12-20 volt as needed for
> >automotive use.  Does anybody have any idea how to get a 5volt to work
> >with 12-15 volts?  If so then these would be a lot cheaper than the
> >800,000 microfarad that 2000 sells for $125.00...
> >
> >                                   William C. Devine, II
> ----------
> 
> Stack 4 in series and you get a 0.25 Farad capacitor for 4x$19 or $76 that
> is rated at 20 Volts.  Of course it will take up alot of space.
> 
> I saw an add in some parts mag. for 0.1F 20V caps for $18.95.  I'm
> thinking this might be a good buy.  Size is 2.5"Dia. x 4"Long.
> 
> Kirk out

From the 1 F/ 5vDC rating I'm guessing this is a 'supercap' designed for
backing up C-MOS memories and clocks in battery powered computers. These have
very slow discharge rates (almost like a high impedance battery rather than
a cap) and are not designed for bypassing power lines.  I advise a little
more homework (like a call to the manufacturer) before $pringing $80 for
four of 'em.

Norman Tracy znpt01@trc.amoco.com
Organization: Junior, Math/Computer Science, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.audio.car
Date: Fri, 20 Nov 1992 12:57:50 -0500 
From: Stefan E Sherwood <ssa7+@andrew.cmu.edu>
Subject: MD players

Has anyone heard anything about the new Mini-Disc (MD) coming to car
stereos.  There are so many advantages to MDs:

1) Smaller (2.5" sqare) discs
2) Scratch-proof cover (like a 3.5" computer disk)
3) Recordable
4) Non-skipping (most players have a 10 second memory, so you'd have to
go over 10 seconds of HARSH - enough to make the player unable to read
any data - bumps before it started skipping)

Considering that the portable, recording units have an introductory
price around $700, I think that pretty soon car units will be available
for substantially less than that.

Stefan Sherwood
ssa7@andrew.cmu.edu
(Carnegie-Mellon University)
Xref: sparky rec.audio.car:4950 alt.locksmithing:2032 alt.tasteless:12713
From: kmr4@po.CWRU.edu (Keith M. Ryan)
Newsgroups: rec.audio.car,alt.locksmithing,alt.tasteless
Subject: Re: Car alarms
Date: Thu, 19 Nov 1992 06:05:22 GMT
Organization: Case Western Reserve University
NNTP-Posting-Host: b64746.student.cwru.edu

In article <1992Nov18.155410.7997@nmt.edu> houle@nmt.edu (Paul Houle) writes:

>	I think that the right viewpoint is to keep a low profile.  The kind
>of people who have to buy an expensive car stereo to make up for having
>a 2 inch dick really deserve to get their stereo stolen and their tires
>slashed,  etc.  Anyone who spends his money and time "detailing" his
>minitruck deserves to see it reduced to scrap metal on the bottom of a
>gorge.  No exceptions.

	*ahem* I hope this was sarcasm. In a civilized society, no one
"deserves" to have their car/stereo stolen. And, if they wish to spend their 
hard earned money on their truck, they ought to be allowed to. 
	I live in the US of A, I don't know where you do.
From: dsg@cci632.cci.com (Dave Greenberg)
Subject: Re: Nabbing a car thief (was: car alarms)
Organization: [Computer Consoles, Inc., Rochester, NY
Date: Fri, 20 Nov 1992 14:47:44 GMT

In article <kmr4.264.722137330@po.CWRU.edu> kmr4@po.CWRU.edu (Keith M. Ryan) writes:
>In article <1eegh0INNg50@athena.sdsu.edu> dunster@sdsu.edu (mark dunster) writes:


	Cool Story Keith....It was riviting!!! I was glued to my terminal
through the whole thing!! You should write for a living!!  (Do you?)  

Well, anyway I just wanted to post to say ...MAN YOU GOT BALLS!!
I don't know if I would have had the guts to pull a 12 gauge on a thief.
(Though if I walked outside to see a thief ripping apart my 3000GT, I
don't know what state of mind I'd be in!)

Though I know you are not really "ok" with what you did, I offer a
BRAVO! - good job. (For whatever it is worth to you!)



						Dave
From: holowczk@rwja.umdnj.edu (Richard Holowczak)
Newsgroups: rec.audio.car
Subject: Re: Alarm for carjacking
Date: 18 Nov 92 04:02:07 GMT
Organization: Robert Wood Johnson Medical School, Piscataway NJ

kmr4@po.CWRU.edu (Keith M. Ryan) writes:

>In article <1992Nov12.005459.24362@oracle.us.oracle.com> jpau@oracle.com writes:

>>Does anyone has any suggestion for any addons to your existing alarm system
>>to take care of the now getting popular carjacking problem?

>	I forgot one more method, but the individual has to decide how '
>brave/stupid' they are.
>	If you are at an intersection, it's called flooring it. Most car 
>theives do not want to kill someone, and they may hesistate on firing. A
>car theft is now common, and for the most part, loosely investigated. But, 
>a murder brings more attention. However, it's a risk one must take. Nothing 
>is certain.

    One thing I do is not to pull up close to the car in front of me at red
    lights.  This way, if someone is approaching your car, you can either
    pull a U-Turn or drive around the car in front of you to get away.

   Rich H.

 
Newsgroups: rec.audio.car
From: gilchr@ee.ualberta.ca (Andrew Gilchrist)
Newsgroups: rec.audio.car
Subject: Xover points, Brian Gentry
Date: 17 Nov 92 05:19:22 GMT
Reply-To: gilchr@ee.ualberta.ca (Andrew Gilchrist)
Organization: University of Alberta Electrical Engineering


Okay.  I figured out what I was thinking.

In a previous post about crossover slopes, etc. I stated that using
a passive crossover for slopes greater than 6dB/octave was a poor
idea.  Brian responded by explaining that there is significant
empirical evidence to suggest that passive crossovers with 12 and 18dB/octave
slopes can yield perfectly acceptable results, and are used in many high
end speaker systems.

He is correct, of course.

I was thinking in terms of DoItYerself circuitry.  The tendency for
inexperienced DIYers is to try to make a second order filter by cascading
two first-order sections.  This is not the way to do it. It is this
method of generating 12 and 18 dB/octave slopes I was thinking of.

With the proper reference, there's no reason you couldn't build a
perfectly feasible second or third order chebychev, butterworth, or
whatever. (I would recommend going for Legendre-Papoulis)

The bad part is, for passive crossovers, you need big coils.  I hate
coils.  You also need unpolarized capacitors.  Usually pretty big ones.

You get much better control over the poles in an active design.
Besides, active crossovers are cheap nowadays.  Why torture yourself
winding coils? (I suppose you could go by an xover from Rad-Shak)

Anyways, I appologize to everyone for this misunderstanding, and I hope the
flamefest can end.

Andrew
From: rob.runkle@cccbbs.UUCP (Rob Runkle) 
Newsgroups: rec.audio.car
Subject: RE: CAR ALARMS
Date: 16 Nov 92 22:10:00 GMT
Distribution: world
Organization: Cincinnati Computer Connection BBS - Cincinnati, OH - 513-752-8248
Reply-To: rob.runkle@cccbbs.UUCP (Rob Runkle) 

-> Maybe I am alone in this statement.
-> I would almost love to see some jerk get his car stolen
-> when I think of all of the false alarms I have to deal with!!

I hope you are alone.  Bitch and Moan......Awww!  I don't know about you
but I have alot to protect in my car and if my alarm goes off once or
twice a year........tough!  I have 4 different sensors in my car and it
RARELY ever goes off.  If it does....it is because some ass bumped it or
something.  So....as you say it.....DEAL WITH IT!
                Thanx,  Rob Runkle
P.S.  Lets see if we can make everthing perfectly silent for this guy.
                                
Newsgroups: rec.audio.car
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Re: Decreasing Volume in Sub-box
Organization: University of Alberta Electrical Engineering
Date: Tue, 17 Nov 1992 16:10:33 GMT

Appologies if anyone has already said this, but my nnmaster is down, and I am
unable to use anything but (ick!) rn.

You may find that your 3.1 ft^3 box may be closer to 2.5 ft^3 than you think.
If you subtract the volume of the driver and the port, the apparent volume
decreases.

Of course, the manufacturer may have already accounted for the volume of the
driver in the box (not likely) or the port (wildly unlikely).  As well, there
have been mumblings that your internal volume can be off by as much as 10%
without much effect.  (But don't quote me.)  Finally, the manufacturer may
have intended the box to be stuffed, and if you didn't, the internal volume
may be closer to ideal.

But, if you want to easily adjust the volume, then putting dense blocks of
sytrofoam in the cabinet will reduce the apparent volume.  Basically, anything
that's not air-permiable and occupies space will work Ok.  Oh, yes, and it
shouldn't deform too much. (IE: Not jell-o)

Finally, if you haven't, I strongly recommend checking the tuning of your
box after you're finished fooling with the size.  Being even a few hertz
off in the tuning can seriously change the system's response.

If anyone doesn't know how to check the tuning, I'll post the method.

  - Cal
-- 
  - Cal Demaine                   | The university may own my ideas and opinions
    (demaine@bode.ee.ualberta.ca) | but don't think for a moment they share them
Newsgroups: rec.audio.car
From: jsc52962@uxa.cso.uiuc.edu (Jeffrey S. Curtis)
Subject: Power lines near preamp signals
Organization: University of Illinois at Urbana
Date: Tue, 17 Nov 1992 17:40:27 GMT

I'll be installing a new amp tomorrow, and in planning out where to
run all of my wires, I've come across a problem.  I am going to have
to deal with one of two situations:

	1) Running the amp's +12V lead, which will be carrying
	   around 25-40 amps, within a couple inches of my
	   preamp cable, or

	2) Running the amp's +12V lead about eight feet longer
	   than it needs to be in order to avoid the situation
	   in (1).

I don't like either of these.  I imagine the first will give me
nasty ignition noise, while the second could cause extra heat in
the cable and the extra inductance could cause lower a lower
dI/dt potential (that is, the amp couldn't draw more current as
rapidly as it would be able to if the power lead were shorter).

So, expert installers, what would you have me do? Thanks for any
tips..

Jeff
-- 
Jeffrey S. Curtis sidewinder@uiuc.edu | "Resplendent and full again, they revel
 The Power of 37  free2207 at uiucvmd | in their role as self-appointed critics
   Jensen - Polk - Sansui - Proton    | of the establishment..."
 Sony - StreetWires - Sanyo - Sennet  |   -- INXS _Welcome to Wherever You Are_
Newsgroups: rec.audio.car
From: johnlake@microsoft.com (John Lake)
Subject: Re: DREAM SYSTEM...
Date: 18 Nov 92 04:42:48 GMT
Organization: Microsoft Corporation

In article <kmr4.161.721454777@po.CWRU.edu> kmr4@po.CWRU.edu (Keith M Ryan) writes:
>In article <1992Nov10.211314.12013@nmsu.edu> miarmijo@nmsu.edu (Michael Albert Armijo) writes:
>>Hey?! I was wondering how many of you readers have ever seen the ad by
>>COUSTICS in Car Audio magizine, where the ad has like 20 amps and
>>about 50 speakers connected to 4 crossovers?!  Well, do you think that
>>the ad is true?  Is that really possible?
>
>	One question: Why would you want it? 
>
>	" If you can't get six speakers to sound accurate, how the hell can 
>you get 20 speakers to?" - heard at a sound off competition.
>
>>I also have a request about what you think the ultimate dream system
>>would be- with amps and all!!!
>
>	*sigh* how about if one untotaled my cougar, which a drunk driver so 
>nicely decided to rearrange.

OVERKILL !!!!!!!!!!!!!!!


QUALITY NOT QUANTITY!!!!!!!!!!
From: jkung@acs.ucalgary.ca (Jimmy Kung)
Newsgroups: rec.audio
Subject: Test. (11/18)
Date: 18 Nov 1992 13:25:00 -0600
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu

Testing...  Misc-Test (11/18 12:25pm MST)

jkung@acs.ucalgary.ca      |  "It's better than bad,it's good!"
                           |             - Log(tm) by Blammo!
From: dhukill@esprit.prime.com (Dave Hukill x4056 5-1)
Newsgroups: rec.audio
Subject: Digital Amps -> next???
Date: 19 Nov 92 14:07:42 GMT

Now that we have CD, MD, DCC, DAT, and even Laser Disc players with digital
outputs, and pre-amps that will accept and convert them to analog, the
next logical step is digital amps, and obviously, speakers. Is this type
of technology possible? Does it even exist? Assuming these are true, what
advanatages/disadvantages would this provide? I think a discussion on this
subject would be both interesting and educational.


Dave Hukill <dhukill@esprit.prime.com>
Newsgroups: rec.audio,rec.audio.pro,comp.sys.ibm.pc.soundcard,comp.multimedia
From: gburton@magnus.acs.ohio-state.edu (Garland O Burton)
Subject: Re: Interface Digital Audio <---> Computer ???
Organization: The Ohio State University
Date: Wed, 18 Nov 1992 16:53:46 GMT

different types of the beast you discribe do exhist.

i use the digidesign soundtoolsII system.
it runs on a macintosh.  a 1.2 gig hard drive gives me about an hour
and 40 minutes of digital stereo at 44.1 and about 1hour 30 at 48k.

yes, the mouse is sharper than the razor blade.

gob!

-- 
gburton@magnus.acs.ohio-state.edu.............copyright 1992 gary burton........
Newsgroups: rec.audio
From: pn002b@uhura.cc.rochester.edu (peter christopher norton)
Subject: Interesting function on an old Dennon CD player
Organization: University of Rochester Computing Center
Date: Wed, 18 Nov 92 08:54:46 GMT

I was wondering, audiophiles, about a C.D. player that I bought a long time
ago from a friend who was moving away....

The interesting feature is an "Index" button, which I haven't been able to
figure out... meaning I lost the manual soon after I got it home. 
Otherwise, I've been in love with it for the past few years, but if there's
something useful that I can do with it, please tell me.  

If this is the wrong newsgroup, then just tell me, and we'll all just 
quietly let this message die...

otherwise, please I want to know!  (sorry, as I don't have this player in
school with me, I don't know it's serial #, but it's old... no oversampling,
and the console consists of buttons like this:

			|1|6 | repeat, etc
			|2|7 |
		Display	|3|8 |
		area	|4|9 |
^^^^^^^^^^^^^^^^^^^^^^^^|5|10|
			| |10+|
eject,<<,>>,etc...	 ^
			index key

Sorry for taking up so much space, but it's a driving curiosity...
From: kirk@hpcc01.corp.hp.com (Kirk Lindstrom)
Date: Fri, 20 Nov 1992 16:27:49 GMT
Subject: Re: group faq
Organization: Shredding the water of SF Bay, HP-OCD
Newsgroups: rec.audio

Why don't we start with speakers?  Sort of a list of favorite speakers for

$50 and under (each)
$100 and under 
$200 and under
$400 and under
$800 and under
$1600 and under
$3000 and under

then we do 

Favorite  nonDSP receivers
$200 and under
$400 and under
$800 and under
$1600 and under

Favorite DSP receivers
...

Favorite power amps
$500 and under
$1000 and under
$2000 and under
more

Favorite preamps
$200 and under
$400 and under
$800 and under
$1600 and under
$3000 and under

Note, I'm using the word "favorite" since someone's idea of "best" depends
on many qualities with absolute sound not always being the top of the
list.  We have rec.audio.high end for that list.

Kirk out
=> "We are what we pretend to be."  -  Kurt Vonnegut Jr.
+---------------------------------------------------------------------+
| Kirk Lindstrom - OCD Product R & D | Hewlett-Packard Co.  M/S: 91UA |
|   Engineer/Scientist, Hardware     |                                |
|------------------------------------| Optical Communication Division |
|       kirk@hpoclpa.hp.com          |                                |
|    Kirk Lindstrom / HP0100/UX      | 370 W. Trimble Rd.             |
| ph 408 435 6404 | fax 408 435 6286 | San Jose, CA  95131-1096       |
+---------------------------------------------------------------------+
From: monta@image.mit.edu (Peter Monta)
Newsgroups: rec.audio
Subject: Re: Digital Amps -> next???
Date: 23 Nov 92 04:10:49 GMT
	<1992Nov20.172517.28470@serval.net.wsu.edu>
Organization: MIT Advanced Television Research Program

bvanhof@pvlab2.eecs.wsu.edu (Barry Vanhoff) writes:

> For those interested in digital amps, see JAES June 1991 for a paper
> by Goldberg and Sandler, 'Noise Shaping and PWM for an All Digital
> Audio Power Amp'
>
> Has anyone with real technical expertise seen this paper, and if so,
> do you have any comments??

Not sure if I have RTE :-), but it did look interesting.  There's also
an AES preprint early this year.  One problem seems to be the
filtering requirement at the output---a series inductor would need
very low resistance and must tolerate large currents.

Would there be any problem with simply scaling the impedance of
speakers (upward)?  High-voltage fast switches are getting really
good.  Safety concerns if taken to extreme, I suppose.

Peter Monta   monta@image.mit.edu
MIT Advanced Television Research Program
Newsgroups: rec.audio
From: rmcghee@fnma.com(Rich McGhee)
Subject: For Sale: HK Int Amp PM655
Reply-To: rmcghee@fnma.com
Organization: Fannie Mae
Date: Sun, 22 Nov 1992 20:59:13 GMT

FOR SALE:  Harmon Kardon PM655 integrated amp.  It is approximately two  
years old and in excellent condition.  A great piece.  I am interested in  
getting a some separates.  Price: $450 or best offer.

--
Rich McGhee, Advanced Technology
Federal National Mortgage Association
3900 Wisconsin Avenue, 4S-2H
Washington DC 20016
NeXTMail: rmcghee@fnma.COM
From: curt@oasys.dt.navy.mil (Curt Welch)
Newsgroups: rec.audio
Subject: Re: DCC -- JUST SAY NO!  (was: The end of cassettes,
Date: 18 Nov 92 06:31:55 GMT
Reply-To: curt@oasys.dt.navy.mil (Curt Welch)
Organization: Carderock Division, NSWC, Bethesda, MD

In rec.audio, jj@alice.att.com (jj, curmudgeon and all-around grouch) writes:
>I'm sorry that you don't understand the basic technology,
>and I'm sorry that you haven't taken the time to examine the
>DCC technology, and the results of the CCIR SG10 report
>on ISO MPEG Layer I in tandem applications before you've
>resorted to what is essentailly an ad-hominem attack.

OK, you're obviously know more about the subject than I do and you're
not the bozo I thought you might be.  I'm sorry if I offended you.

I do expect multiple generations of DCC or MD to degrade, but how much?
You made it sound like it would be worse than cassette tape.  I would find
this hard the believe. (though I'll believe it in a second if I hear
it for myself).

I just got done reading the review of the Philips DCC900 DCC deck in
this month's Stereo Review (everyone interested in DCC and MD should
pick up a copy of this).  The reviewer concludes: "...anyone who
expects to find that perceptual coding is hokum, or that their ears
transcend the physiological constraints upon which it is based, will be
shocked by the very high-fidelity sound DCC actually delivers.  There
is absolutely no question that it rivals CD sound quality."

In his few hours of testing (before Hurricane Andrew hit his office),
he basically couldn't hear a difference between the CD and the DCC
recording of the CD.  I find it hard the believe that any recording
system that can do this, will degrade worse than cassette on multiple
generations.  And, I expect that it's much better than cassette, and
only slightly worse than DAT.

I think that people who want the highest quality should go for DAT/CD
and if you want features, you should go for MD.  I just don't see how
DCC can survive.

Curt
Newsgroups: rec.audio
From: pascal@eng.umd.edu (Pascalis Ligdas)
Subject: OPINION on SPEAKERS needed
Date: Sun, 22 Nov 92 04:22:27 GMT
Organization: College of Engineering, Maryversity von Uniland, College Park
Originator: pascal@bayes.eng.umd.edu



I am looking for speakers in the range of $200-$350/pair. So far I've
had the following recommendations:

        Bose 301 (w/ free space array ) 
        Bose Freestyle
        Cerwin Vega AT-10
        Cerwin Vega VS100

I would appreciate your comments on any of the above and/or
other speakers in this range. Also, if you've had any experience
with the so-called "free space tweeter array", please post 
some info on how it works. 

(I will be playing mostly modern jazz & classical music)


Thanx in advance,

-- 

==========================================================================
Pascalis Ligdas
Institute for Systems Research                   e-mail pascal@src.umd.edu
From: jung@dosequis.eng.ohio-state.edu (Tzyy-Ping Jung)
Newsgroups: rec.audio
Subject: Need help on an amplifier (or a receiver).
Date: 17 Nov 92 21:48:56 GMT
Organization: The Ohio State University Dept of Electrical Engineering

Hi, there,
  
  A friend of mine just bought a pair of used Magneplanar
SMG loudspeakers. He is in the market of purchasing a budget
power amplifier (or a receiver) to partner with the
loudspeakers. I am wondering if there is anyone out there could
give me (actually him) any recommendation?

  Any suggestion will be very appreciated.

Tzyy-Ping Jung,

-- 
-- 
Tzyy-Ping Jung                          jung@ee.eng.ohio-state.edu
Department of Electrical Engineering                 673 Dreese Labs
Ohio State University                               2015 Neil Avenue
Newsgroups: rec.audio
From: rsd@sei.cmu.edu (Richard S D'Ippolito)
Subject: trivia (Was Re: Help!)
Organization: The Software Engineering Institute
Date: Mon, 23 Nov 1992 15:33:15 GMT


In article <1992Nov22.173145.9975@bilver.uucp>, Bill Vermillion writes:

|> Last week's correct answer to what musical instrument is the
|> decendant of the sackbut, are Dick Pierce, and Ian McVey,(who
|> replied by mail) along with the poster to the net.  The
|> instrument is the trombone.  You all now have your rec.audio
|> subscription extended for another 10 years!

So now I'm "Curmudgeon-anonymous" -- just call me Rodney; I've got the right
initials.

R.D.

From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 20 Nov 1992 17:54:14 GMT
Subject: Re: HELP! Info on MD and DCC
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.audio

> 
> |> Now for today's trivia question.  Which of today's musical instruments
> |> is a decendant of the sackbut.
> 
> The trombone (from the italian large _tromba_, or horn) is essentially a
> sackbut (or sacbut) with most of the difference being in the mouthpiece size
> and bell flare.

Damn.  Rich beat me to it.  (I happen to play the trombone, so Bill
unwittingly asked one I could look good on!)

> 
> So, where'd the oboe come from?

Considering the sound, could it be......SATAN??!???!??!?!!!!!   :-)

> 
> Rich
> 

Bob M.
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 20 Nov 1992 17:50:36 GMT
Subject: Re: Cable Design Proposal
Organization: Hewlett-Packard, Fort Collins, CO, USA