HDTenEightyP/NetNews huggingface dataset:
From: James@socrates.umd.edu (James E. Taylor)
Subject: Comments wanted regarding Kenwood KDC-77R
Organization: University of Maryland, University College
Date: Tue, 22 Dec 1992 18:53:25 GMT

My brother is considering purchasing a K[?D]C-77R CD player for his wifes 
car.  I'm looking for any comment regarding this model or how it
compares to others.  I know I'm not providing a great deal of information,
but if someone has one and had problems or thought it was worthwhile then 
it would help to help from you.  I think this is a removable player, is this 
kind of player a "red flag" for thieves?  Any information would be 
appreciated.

James Taylor
james@socrates.umd.edu
Newsgroups: rec.audio.car
From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
Subject: Re: Box Volume
Organization: Skidmore College, Saratoga Springs NY
Date: Mon, 21 Dec 1992 15:51:17 GMT

cjm9321@hertz.njit.edu (The InfoMan) writes:
> 
> 	Hello all,
> 
> 	I was just wondering if there is a way to calculate the volume
> of a sealed box using 2 speakers in the same enclosure.
> 
> 	AAll the programs I've seen ask you for the box volume. So is
> there a formula for it that will tell me how much I need to optimize my
> speaker?


To build a box with two identical woofers sharing an air space, you
calculate the volume as normal, but enter the Vas as twice the value
of one driver.  Note that the drivers can be mounted physically out of
phase... or course this must be corrected so that they both compress
the airspace at the same time... not electrically out of phase.  The
advantage to this is that lower driver distortion results as a result
of the drivers being out of phase with each other physically.

	Note that doubling the Vas can be done in designing vented
enclosures as well.

				- Jason
-- 
---------------------------------------------------------------
\ Jason A. Reiser  \ Send E-Mail to jreiser@scott.skidmore.edu \
 \ Skidmore College \ Saratoga Springs, NY 12866 \ 518-581-6580 \  
  \ It's a new Ice Age!  Hooray!!  Sled City!  - Calvin & Hobbes \
Newsgroups: rec.audio.car
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Re: Box Volume
Organization: University Of Alberta, Edmonton Canada
Date: Wed, 23 Dec 1992 21:12:02 GMT

demaine@ee.ualberta.ca (Cal Demaine) writes:

>jreiser@scott.skidmore.edu (Jason Reiser... Asleep) writes:

>>To build a box with two identical woofers sharing an air space, you
>>calculate the volume as normal, but enter the Vas as twice the value
>>of one driver.  Note that the drivers can be mounted physically out of

>Well, I agree with Jason about the (small) benefit of mounting the drivers
>physically out-of phase.  However, I do not see the need for multiplying the
>Vas by two when you can just multiply the end volume by two...

>Awe hell, it's just as easy either way.

Last night, in a fit of experimental drive, I whipped out my copy of Perfect
Box.  Now, I know this program is not the be-all, end-all of subwoofer
design, but it sufficed for my purposes.

Turns out that doubling the Vas will >not< give you the correct response
of a two-driver, sealed system if you're using the Small equations.  However,
doubling the box size will produce what you're looking for.

In direct contradiction, doubling the Vas >will< give you the correct
response of a two-driver ported system!  How about that!  I was dead wrong!

>  - Curious, and likely wrong,
>     - Cal

   - Satisfied, and only half wrong,
      - Cal

-- 
--------------------------------------------------------------------------------
  - Cal Demaine                   | "You shot him in the back!"                 
    (demaine@bode.ee.ualberta.ca) |    "His back was to me!"  - El Diablo    
--------------------------------------------------------------------------------
From: jeh@cmkrnl.com
Newsgroups: rec.audio.car
Subject: Re: DCC
Date: 29 Dec 92 14:20:04 PST
Organization: Kernel Mode Consulting, San Diego, CA

In article <1hoclrINN1s0@network.ucsd.edu>, simon@ivem.ucsd.edu (Simon Lee) writes:
> In article <Bzs8nv.AI1@acsu.buffalo.edu> kist@acsu.buffalo.edu (james e kist) writes:
>>Could somebody tell me exactly how Digitally Coded Cassettes differ from
>>DAT? I mean, since DAT has failed, how can any manufacturer possibly think
>>that they're going to get anywhere with this format? 
> 
> The main difference is DCC uses a recording head similar to the conventional
> cassette heads, which allows the use of both analog and digitally encoded
> cassettes.  DAT uses a helical scan rotating drum for the read/write head
> which was susceptable to misalignment, just like a VCR head.  

DCC (and MiniDisc) are also unlike DAT in that the full 16-bit samples are not
stored; lossy data compression is used to increase the capacity.  

> I think it didn't catch on because it was another format.  

I don't think this was the only issue.  Remember that VHS came in after Beta
and all but killed it, even though VHS was an incompatible format, mostly
because people were more interested in longer recording times than in higher
quality video and smaller cassettes.  Remember that 8mm camcorders are clearly
winning over VHS and VHS-C models, even though 8mm can't be played directly in
the typical home VCR. 

So it is possible to successfully market "another format" -- if there are
compensating benefits.  

I think that DAT has failed to catch on in the consumer market because most
people simply don't need it -- and the decks are priced high enough to
discourage most of those who don't need it.  If DAT decks had been available
for, oh, the price of a good cassette deck, say $300 or so, it would have made
a much better showing.  

> I heard the DCC system and it sounds nice.  I haven't heard the MiniDisc
> system yet, but I think between the DCC and MiniDisc, the MiniDisc is more
> convienient, especially when they get a rewritable system out.  They have a
> faster seek, no tape to get munched, and they even have a protective case like
> the DCC tapes, so you can change MiniDiscs in a car without worring about
> scratches :)

I agree and I hope that Sony wins this particular marketing battle.  However,
the early DCC and MD decks seem to be priced way too high for easy acceptance,
especially in these times.  I see more and more evidence that people are
starting to seriously question just how many of the latest gadgets they really
NEED to own.  Many are also questioning just how much money they want to send
to overseas companies.  BOTH formats might lose in this economic climate.  IMO
that would be a shame; I know lots of people who could make good use of MD. 

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
Newsgroups: rec.audio.car
From: jsvec@umaxa.weeg.uiowa.edu ()
Subject: Isobarik subwoofer design
Organization: University of Iowa, Iowa City, IA, USA
Distribution: usa
Date: Wed, 30 Dec 1992 04:41:33 GMT

I want to build a subwoofer, and have more or less decided to try an 
Isobarik design using two Madisound 12" woofers.  I was just wondering if
anyone out there has had experience/luck in building Isobarik boxes and/or
has any comments about Madisound drivers.

I am planning on using Madisound's 12204DVC drivers (dual 4 ohm voice coils)
with the coils of each driver wired in series (8 ohms/driver 200W power 
handling).  I have run Madisound's published T/S parameters through 
"PerfectBox" which told me that in a 3.76 cu. ft. cabinet (vented), the
system would have an "f3" of 22HZ.

I have read a number of articles in Speaker Builder that mention Madisound
drivers sometimes (?) tend to be way off spec (any comments)?  I have been
unable to find any other drivers with specs that would suggest that they would
be able to produce large amounts of subsonic (below 30Hz) output in a box
that is as small as the one that the Madisound drivers (supposedly) require.

I would prefer a higer efficiency driver, but it seems that most high 
efficiency drivers tend to sacrafice low frequency extension.

Any comments/suggestions would be appreciated.  Basically, I guess, I'm
looking for drivers which cost less than $80 which will go flat to 20HZ
in a less than 5 cu.ft. box...

Thanks in advance.
From: cjm9321@hertz.njit.edu (The InfoMan)
Newsgroups: rec.audio.car
Subject: Re: 4x6" Plate Speakers (Update)
Date: 23 Dec 92 01:22:08 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.

In article <1992Dec17.194437.5586@njitgw.njit.edu> cjm9321@hertz.njit.edu (The InfoMan) writes:
>
>
>	Hello all,
>
>	I'm in search for a pair of 4x6" Plate speakers that have a
>woofer and tweeter. I haven't had time to shop around yet so I just
>composed a list from the CSR Buyer's Guide.
>
>	Let me know what you think of the following:
>
>		Altec Lansing		ALS-46
>
>		Earthquake		PL-46
>
>		G&S			NS-46PL
>
>		Gold Sound		GS-4x6P
>
>		MTX			RTP46 and MTP-462
>
>		Ultimate Sound		PT46
>
>
>	Well, I went to two places so far, And the only ones that I saw
>were the MTX (I forget which one) and the JBL. The JBL cost more (of
>course) but the MTX had a better crossover network. The JBl just had a
>cap for the tweeter. The MTX comes with a 3 year over the counter
>warranty (If anything goes wrong, I just go back and get a new one that
>same day). 	so far it looks like the MTX but do any of you have any
>comments on the above?
>
>
>					Thanks a lot,
>
> 

	Ok, the update is that I went to a few more places and weren't
please with the ones I deleted. Some people suggested the Polks and the
a/d/s/. Well, the a/d/s/ are way out of my price league. The Polks were
just a little out but they are still in the back of my mind.

	So far I am in a toos up between the MTX and the Altec Lansing.
I haven't been able to see the Altec Lansing since they were out of
stock. But they are both the same price and they both have an LC X-over
circuit. I'm leaning towards the MTX since it has a 3 year warranty but
I'm still not decided. 

	A problem came up, it was weather or not the Altec Lansing would
fit in my car. My car is an '87 Pontiac Safari Wagon. The driver's side
might not fit due to the back of the instrument cabinet. 

	I would assume that the Altec Lansing would sound better than
the MTX but I would have to wait to mid-January.


				Well, this has been an update,

				Thanks to all that replied and reposted.



-- 
M A D E   .   . .---. .---.    \  Buy U.S.A. products,  /    xxxxx ==========
  I N     |   |  \    |___|    <     It's YOUR job.     >    xxxxx ========== 
 T H E    |   |    \  |   |    <  Christopher J. Massa  >    ================
-------   `---' `---' '   `    / cjm9321@hertz.njit.edu \    ================
Newsgroups: rec.audio.car
From: RYNA10@waccvm.corp.mot.com (Jay Kopycinski)
Subject: WHY SO MUCH POWER/ DBS ???
Organization: Motorola
Date: 30 Dec 1992 14:23:26 MST

------------------------- Original Article -------------------------
From: kirk@hpcc01.corp.hp.com (Kirk Lindstrom)
Date: Sat, 26 Dec 1992 14:52:54 GMT
Subject: Re: Why so much power?
Organization: Shredding the water of SF Bay, HP-OCD
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Re: subwoofers/boxes
Organization: University Of Alberta, Edmonton Canada
Date: Fri, 1 Jan 1993 23:16:38 GMT

bell@hops.larc.nasa.gov (John Bell) writes:
>In article <1992Dec30.035321.2866@schbbs.mot.com> bstdenis@mailbox.fwrdc.rtsg.mot.com (Brian St. Denis) writes:
>(...)
>>
>Hmmm, if MTX recommends a ported enclosure, why does he think an infinite
>baffle (also called sealed) enclosure will sound better? Does he have software
>to model it with? How much better will it sound? I'd want to know before
>forking over the bucks.

Hate to be a nit-picking pain, but an infinite baffle enclosure is NOT the
same as a sealed enclosure.

An infinite baffle 'enclosure' is just a driver mounted in an infinitely
large baffle board.  Since no one has an infinite amount of space in their
car, we are forced to do it a little differently.  The trunk is accoustically
sealed from the passenger compartment, and the driver is mounted in the
baffle board that seperates the two.

This sort of set-up has advantages and disadvantages, but I can't generally
recommend it for most people because of the importance of driver selection
and the severe and permanent changes to the car.  (That, and you get all
the metal things in your trunk sticking to the driver motor assemblies!) :)

Sealed is, of course, in a sealed box.  This was not be what the dealer
was offering.

  - As always, a pain,
    - Cal


-- 
--------------------------------------------------------------------------------
  - Cal Demaine                   | "You shot him in the back!"                 
    (demaine@bode.ee.ualberta.ca) |    "His back was to me!"  - El Diablo    
--------------------------------------------------------------------------------
From: cah@wancom.Columbia.NCR.COM ()
Subject: Front speakers in an Acura Legend
Organization: NCR Corp, E&M-Columbia, Columbia, SC
Date: Wed, 30 Dec 92 16:34:50 GMT

About a year ago, I started upgrading the sound system in my 1990
Acura Legend (2-door).  I replaced the factory radio with an Alpine
CD player with a separate amp.  I also trashed the factory rear speakers
and replaced them with a pair of JBL's (left over from my previous car).
I've decided it's finally time to do something about the front speakers,
and would like some advice.

I've decided to go with a separate component system (tweeter, midrange,
and crossover).  The midrange will fit into the factory mount, and I
can mount the tweeter high on the door where the side window defrost vent
is.  Should the tweeter be aimed back toward the passenger compartment,
mounted flush toward the middle of the car, or forward (in hopes of getting 
better sound distribution by reflecting off the windshield)?

Also, I've been looking at speakers made by Alpine ($170), Boston Acoustic
($220), and Polk ($300).  It's difficult to measure the quality of the 
speakers by listening in the store.  Are the Polk's $130 better than the
Alpine's?  Or are there some other speakers I should be looking into?
I usually don't turn the music very loud - it's more important to me to
have a good quality sound at lower volume.  Any advice you folks may have 
will be greatly appreciated.

Thanks in advance.

cah

Newsgroups: rec.audio.car
From: ajones@dadd.ti.com (Alan Jones)
Subject: Why so much power?
Reply-To: ajones@dadd.ti.com
Organization: Texas Instruments, Inc.
Date: Tue, 22 Dec 1992 19:49:40 GMT

I'm sure this is a FAQ, but I'll ask it anyway.  I asked this question to a
salesman at a car audio store, and wasn't impressed by the answer he gave me.

Anyway, why do cars require so much power to produce quality music?  Most good
systems seem to include hundreds of watts of amplifier power.  My home system
has only 45 watts, and it's so loud I never turn it up past 50%.  The area
inside a car is so small - I'd expect that you wouldn't need much power to fill
it with quality music.  What's the deal?

By the way, where can I find the FAQ?  I've been patiently waiting for it to
be posted but I haven't seen it.

ADVthanxANCE!

---
sincerely,
Alan Jones  /  Texas Instruments, Dallas, TX  /  email=ajones@tiasic.csc.ti.com
From: Digger@qube.OCUnix.On.Ca (Digger)
Newsgroups: rec.audio.car
Subject: Re: Fix scratch in CD?
Distribution: world
Date: 20 Dec 92 17:19:21 EDT
Organization: The QuBE BBS

 DO> The recording on a CD, if I remember correctly, is a series of tiny
 DO> holes that are "read" by a laser
 DO> beam. Remember that there is no physical contact between the CD and
 DO> the reading head.

Absolutely

 DO> Your CD mistracks because the digital information on the disk is
damaged.

Not necessarily.  If the chip is on the 'label' side and is deep enoigh to
have penetrated the aluminum layer, the information is damaged.  In
addition, the laquer seal has been broken so the aluminium will oxydize. 
The disk is junk.

If the chip is on the other side (the side that's read), the digital
information hasn't been damaged and if the damage is slight, it may be
repaired.  I've never done this because I've never had the misfortune of
having a disc damaged but there are abrasives that can be purchased for
this purpose.  I've even hear that toothpaste works...

-- Via DLG Pro v0.992
From: simon@ivem.ucsd.edu (Simon Lee)
Newsgroups: rec.audio.car
Subject: Re: DCC
Date: 29 Dec 1992 02:20:43 GMT
Organization: University of California, San Diego
NNTP-Posting-Host: ivem.ucsd.edu

In article <Bzs8nv.AI1@acsu.buffalo.edu> kist@acsu.buffalo.edu (james e kist) writes:
>
>
>Could somebody tell me exactly how Digitally Coded Cassettes differ from
>DAT? I mean, since DAT has failed, how can any manufacturer possibly think
>that they're going to get anywhere with this format? 

The main difference is DCC uses a recording head similar to the conventional
cassette heads, which allows the use of both analog and digitally encoded
cassettes.  DAT uses a helical scan rotating drum for the read/write head
which was susceptable to misalignment, just like a VCR head.  I think it
didn't catch on because it was another format.  People already had a lot of
CD's and tapes, why buy another tape system for digital when CD's were there?
I heard the DCC system and it sounds nice.  I haven't heard the MiniDisc
system yet, but I think between the DCC and MiniDisc, the MiniDisc is more
convienient, especially when they get a rewritable system out.  They have a
faster seek, no tape to get munched, and they even have a protective case like
the DCC tapes, so you can change MiniDiscs in a car without worring about
scratches :)

-- 
*   Simon Lee              *   Microscopy and Imaging Resource          *
*   simon@ivem.ucsd.edu    *   Intermediate Voltage Electron Microscopy *
*   sulee@ucsd.edu         *   UC San Diego, Dept. of Neuroscience      *
-------------------------------------------------------------------------
Newsgroups: rec.audio.car
From: ajones@dadd.ti.com (Alan Jones)
Subject: Mail order companies/addresses
Reply-To: ajones@dadd.ti.com
Organization: Texas Instruments, Inc.
Date: Mon, 28 Dec 1992 20:41:01 GMT

I recently saw one or two postings which had the names and addresses of some
good mail order companies which market car audio components.  Would someone be
so kind as to post (or email) the names and addresses?

Also, does this newsgroup have a FAQ?  If so, whar is it???

---
sincerely,
Alan Jones  /  Texas Instruments, Dallas, TX  /  email=ajones@tiasic.csc.ti.com

Newsgroups: rec.audio.car
From: mjs@hubcap.clemson.edu (M. J. Saltzman)
Subject: Sony cassette deck is vibration-sensitive?
Organization: Clemson University, Clemson SC
Date: Mon, 28 Dec 1992 17:37:47 GMT

I have a Sony XR-5550 cassette deck, which I purchased last summer.  
Recently, I noticed that, even over relatively smooth roads, at highway
sppeds, tapes sounded like the sound was breaking up (particularly,
female vocals, violins and steel guitars sounded sort of like they
were gargling).  It eventually got to the point where I was able to
reproduce the symptom by tapping on the dash near the player, and the
dealer replaced the unit.  The new unit seems to exhibit the same symptom,
but not so severely (I can't reproduce it at will, for example).  It 
seems more pronounced at the beginning of a tape.

My questions:

What exactly is the problem?  How much sensitivity is normal?  (I could
understand extremely rough roads, but moderately old, paved
interstates?)  Is this a common problem with Sonys?  Can it be
repaired?  What can I do to convince my warranty station that there's
a problem with the new unit (short of taking them out on the highway)?
What recourse do I have if the Sony claims that the unit works
correctly?  (The dealer called Sony, and they said that they had never
heard of such a problem.  It seems strange that I would have it in two
units in a row...)

Help, please!  If I am going to do something with the original dealer,
I need an answer this week, as I am leaving the area soon, and I'll
have to go to the nearest authorized service center to my new location
and start the process again.  I doubt that the new center will consent
to a swap.

-- 
		Matthew Saltzman
		Clemson University Math Sciences
		mjs@clemson.edu
Newsgroups: rec.audio.car
From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
Subject: Aftermarket CD in a Honda...
Organization: Skidmore College, Saratoga Springs NY
Date: Sat, 26 Dec 1992 07:53:43 GMT

Fellow Netters,
	Not long ago, I posted information regarding the installation
of an aftermarket CD player in a Honda vehicle (Preludes and Accords
'87 and on) and have since misplaced my own hard copy of this
information.  Could anyone please either followup to to this post, or
preferably E-Mail me the original schematic?
	As it would seem, I have finally convinced my girlfriend to
buy a player, and the info is missing.  This would be easier than
chatting with Sony Tech. for a while... 

	Thanks!
				- Jason
-- 
---------------------------------------------------------------
\ Jason A. Reiser  \ Send E-Mail to jreiser@scott.skidmore.edu \
 \ Skidmore College \ Saratoga Springs, NY 12866 \ 518-581-6580 \  
  \ It's a new Ice Age!  Hooray!!  Sled City!  - Calvin & Hobbes \
Newsgroups: rec.audio.car
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Re: Isobarik subwoofer design
Organization: University Of Alberta, Edmonton Canada
Date: Fri, 1 Jan 1993 23:26:17 GMT

ldormon@uk.oracle.com writes:


>Err just one question about isobarik designs, if you have the drivers
>one behind the other (ie NOT firing into one another), how do you know
>what the volume of the tunnel should be, or do you just put them as
>close together as possible. 

Well, with the drivers mounted back to front, and wired IN PHASE, the volume
of the tunnel is immaterial.  HOWEVER, I strongly recommend you keep it quite
small so the air inside acts as a uniform mass.  This, for once, agrees
nicely with car audio, where we are always trying to save space.

In practice, my isobaric (C! C! C!) design had a dustcap to magnet distance
of about 2 inches.  Make sure you wire the drivers before installing them!
(The bitter voice of experience speaking here.)

  - Cal

-- 
--------------------------------------------------------------------------------
  - Cal Demaine                   | "You shot him in the back!"                 
    (demaine@bode.ee.ualberta.ca) |    "His back was to me!"  - El Diablo    
--------------------------------------------------------------------------------
From: kirk@hpcc01.corp.hp.com (Kirk Lindstrom)
Date: Tue, 22 Dec 1992 18:09:14 GMT
Subject: Re: Re: Class A MOSFET Power Amp for sale...
Organization: Shredding the water of SF Bay, HP-OCD