HDTenEightyP/NetNews huggingface dataset:
From: blaine@catt.ncsu.edu (Greyland Blaine Mull)
Newsgroups: rec.audio.car
Subject: RF punch 75 4 sale!!
Date: 6 Apr 92 20:13:28 GMT
Reply-To: blaine@catt.ncsu.edu (Greyland Blaine Mull)
Distribution: usa
Organization: NCSU CATT Program

hello world\n

	I have a Rockford Fosgate Punch 75 for sale that is in excellent
condition.  This is a 1988 model (NOT HD!) that has been in my
auto-concert hall for 3 years on and off.  I talked to some dealers in
my area and they advised me to ask $325.  Reason being that this is an
older model that punches more current, is easier to repair(not very
likely), and gives stonger bass as compared to the newer guys.

	About a year ago, I had the power LED replaced in the amp and
the shop (which has RTTI graduates working there) bench tested the amp
with both channels driven and received a reading of over 120w/ch into a
2ohm load.  I am looking to make a deal, so give me a reply!

email to blaine@catt.ncsu.edu
  or call 919-828-1937
 Grey Mull	       +Disclamer:  I didn't say it,-+  Macintosh
 blaine@catt.ncsu.edu  |   You didn't see me say it, |       to
 gbmull@eos.ncsu.edu   +---You can't prove anything!-+      NeXT...
NC State CATT Program				Steve Jobs continues...
From: mt2m+@andrew.cmu.edu (Michael James Tester)
Newsgroups: rec.audio.car
Subject: Define Isobaric ???
Date: 7 Apr 92 04:20:48 GMT
Article-I.D.: andrew.wdsGAUe00WB_8YB0Zk
Organization: Freshman, Physics, Carnegie Mellon, Pittsburgh, PA

Again, Is anybody out there. Please someone explain the concept of an
isobaric encloser. Please explain to me how to build a simple isobaric
encloser.
From: harner@sunwhere.dab.ge.com (Keith Harner)
Subject: Re: Blowing Kickers... (was Re: how hard to blow or fix subs?)
Date: Mon, 13 Apr 1992 04:38:18 GMT
Organization: General Electric SCSD, Daytona Beach FL


>You should always be careful.  Remember, "Practice safe sound", as Stillwater
>Designs says.  

ahem.... (As I pause and look down at my "Practice safe sound T-shirt)
My shirt says "etagsof drofkcor" oops..sorry. That's rockford fosgate.
Yea.. I know their stuff pretty much sucks but next to JBL they have
the best designed T-shirts in the busniess. (IMHO of course)
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
|Keith Harner                                   |harner@civax.DAB.GE.COM     |
|General Electric Simulation and Control Systems|harner@sunny.DAB.GE.COM     |
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
From: gravillr@prism.CS.ORST.EDU (Russell J. Graville)
Newsgroups: rec.audio.car
Subject: Tchaikovsky
Date: 15 Apr 92 18:36:58 GMT
Organization: Oregon State University, Computer Science Dept.

How do I tell which 1812 overture is the live one.  The one with the real
cannons?  I just received "Tchaikovsky's greatest hits, vol. 1" and before I
open it I would like to know if I have the right one.  This is what it says:

     5 1812 OVERTURE, Op. 49 (15:20)
       NEW YORK PHILHARMONIC
       LEONARD BERNSTEIN, Conductor
       
Any information would be nice.  Thanks,

______________________________________________________________________________
Russell James Graville                 |
Oregon State University                |      May your luster never dull
Nuclear Engineering                    |      and your wires never cross
gravillr@prism.cs.orst.edu             |                -Optimus Prime
------------------------------------------------------------------------------
From: louis@tronix.SignalPath.on.ca (Louis Bertrand)
Subject: Re: Speaker Builder Mag.
Newsgroups: rec.audio.car
Date: 16 Apr 92 02:40:04 GMT
Distribution: world
Organization: Signal Path Designs

mt2m+@andrew.cmu.edu (Michael James Tester) writes:
> 
>     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.
> 

I'm not sure they have Speaker Builder, but they have a whole bunch 
of interesting books, magazines, projects and test CDs:
  Old Colony Sound Lab
  PO Box 243, Dept.J92
  Peterborough, NH
  03458, USA
Tel: 603-924-6371
Fax: 603-924-9467

They offer a free catalog.

--
Louis Bertrand   *   Lynden, Ontario, Canada   *   (416) 648-8066
Signal Path Designs (Analog - Digital - Audio - Embedded uCs)
louis@SignalPath.on.ca (new -- may not work yet)
louis%tronix@maccs.dcss.mcmaster.ca (old -- still works fine)
Newsgroups: rec.audio.car
From: biancol@bullet.ecf.toronto.edu (BIANCOLIN  FABIO S)
Subject: ahem, kinda left something out.
Summary: More stuff       
Organization: University of Toronto, Engineering Computing Facility
Date: Tue, 14 Apr 1992 00:05:49 GMT

  Sorry, i should have also noted that with your posted equations,
i got a volume of 2.42 ft^3 vs the 5.4 ft^3 that Perfect Box 
calculated for me.   My subs are Crunch 124's. 
   
   Thanks and sorry for the double posting.
  Fabio
From: poulson@cs.widener.edu (Joshua R. Poulson)
Newsgroups: rec.audio.car
Subject: Re: Autotek Amplifiers? (1 ohm stability stuff)
Date: 17 Apr 92 19:16:44 GMT
Distribution: na
Organization: Widener Univ. Dept. of Computing Services
NNTP-Posting-Host: lisa.cs.widener.edu

In article <54922@hydra.gatech.EDU> gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON) writes:
>In article <scp69INNk7q@lisa.cs.widener.edu> poulson@cs.widener.edu (Joshua R. Poulson) writes:
>>1x400 into 1 ohm  -->  50 
>
>I have used the 225HCCA into 1 ohm mono, and frankly, the bass did
>seem to get a little muddy. I think the problem was a combination
>of reduced damping factor and that the amp simply was running out
>of supply current. IMHO, none of the high-current amps out there
>have big enough supply caps. Remember, stored energy is the product
>of voltage and capacitance; reducing the voltage (as is the common
>way of producing high-current amps) results in less energy storage
>for the same size cap. Therefore, much larger (usually a factor of
>4) caps for the same TOTAL power output are needed! No one I have
>"reverse engineered" does this. The Orion 250 HCCA is the closest,
>and it does seem to have the best bass of any high current amp IMHO.
>Next time I get hold of a 225, methinks I will try a cap size upgrade...

Would a 400,000 uF stiffening cap inline from the battery help?  That's
not too hard to get... :)
-- 
Joshua R. Poulson (NIC handle: JRP8)       [Joshua R. Poulson@cyber.Widener.EDU]
Systems Programmer, Widener University     [poulson@cs.Widener.EDU]
"Try to be sensitive..." -- the Usenet Oracle Helpfile (send a mail
message with the subject "help" to oracle@iuvax.cs.indiana.edu)
From: epark@aludra.usc.edu (Eugene Park)
Newsgroups: rec.audio.car
Subject: Sony Discman
Date: 15 Apr 1992 17:00:09 -0700
Organization: University of Southern California, Los Angeles, CA
NNTP-Posting-Host: aludra.usc.edu

I am interested in purchasing a portable CD player that will spend
some of its time in the car.  Does anyone have any comments on the
Sony Discman for the car?  I know they make one geared for car use. 
I forgot the model.  

Anyway, how is the cassette head input response?  How is the convenience
of mounting and removing it?

Any other comments on other brands?  I'm not interested in CD decks or
magazine units.

Any comments are graciously appreciated.

Eugene



-- 
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Eugene Park      University of Southern California > National Center for <
epark@usc.edu    Center for Laser Studies          > Integrated Photonics<
(213) 740-4249   Los Angeles, CA 90089-1112        >     Technology      <
From: gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON)
Newsgroups: rec.audio.car
Subject: Re: cerwin vega 8 inch sixth order box????????
Date: 6 Apr 92 13:59:08 GMT
Organization: Georgia Institute of Technology

In article <53526@hydra.gatech.EDU> gt9605a@prism.gatech.EDU (Arlo James Aude) writes:
>
>The last time I went to a car audio show, they were using Mr. Margerand's
>algorithims to build their enclosures.  When I say they, I mean MTX and 
>ATOMIC.  ORION and ROCKFORD have their own, more knowledgeable engineers
                    ^^^^^^^^                      ^^^^^^^^^^^^^
>to do their dirty work.

After hearing and examining the Punch Classic snclosures, and seeing some of
the designs pushed off by Fosgate for 6th order ebclosures, I tend to think
the 2 words above do not belong in the same sentence.

(OH NO- ITS THE GIANT SMILEY---)

                    ::::                  ))))
                    ::::                   ))))
                                            ))))
                             ----            ))))
                             ----            ))))
                                            ))))
                    ::::                   ))))
                    ::::                  ))))

I have done quite a bit of research into 6th order enclosures, and have 
written a computer program to compute the values of the speaker parameters
and box dimensions necessary for a correct 6th order bandpass. The results
were a mixed-bag - the enclosures were very small if you gave up the 
response below 35 Hz, but got very big below that for any kind of decent
sensitivity (ie 90 dB SPL/1w/1m) The drivers necessary were decidedly 
weird- resonances in the 35-50 Hz regions and Q factors in the .175-.25
range! I only found about a half dozen drivers that qulaified:
MTX RFL Cranker 10,
Fosgate Pro-124,
Pioneer model # C-20 (Pioneer poly-cone home woofer, generally used as a
replacement home stereo woofer)
MTX RTW-104 or 108 (Yes- the Road Thunder 10"- definitely a strange 
application)
EV EVM-12L pro driver, 12"
These drivers gave response ranging from the low 30s ( EV) through the mid
20's (RFL 10, Pioneer C-20) to BELOW 20 Hz (PRO-124, RTW-10 (!) )

Very odd seeming, but you can't fight phisics :-)

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
From: olberdin9578@iscsvax.uni.edu
Newsgroups: rec.audio.car
Subject: 6th Order Band-Pass?
Date: 7 Apr 92 13:20:46 -0500
Organization: University of Northern Iowa
Summary: What type of sub box do I have?
Reply-To: olberdin9578@iscsvax.uni.edu
Keywords: subwoofers, 6th order, Band-Pass

    A friend of mine made a sub box for me and I think he called it a 6th order
band-pass.  It's got a 10 inch Boston Acoustics driver and I run it with an
Alpine 3522 bridged to 80 watts (I think).  It sound good running off my Delco
cassette, but I was just wondering exactly what I have.  Anyone know?  He
said that the left chamber had to be exactly 2/3 of the total and the right
exactly 1/3.  The ports are 1" and 4", but I can't remember how long they are.


   ----------------------------------
   |                    |           |
   |                   /|           |
   |                 /  |   /    \  |
   |      ( )       |   |  (      ) |
   |                 \  |   \    /  |
   |                   \|           |
   |                    |           |
   ----------------------------------

                                             Thanks for any info.

                                             David Olberding
                                             olberdin9578@iscsvax.uni.edu













Newsgroups: rec.audio.car
From: peterco@eff.org (Peter A. Cohen)
Subject: Best Head Unit for under $200?
Organization: ON Technology, Inc.
Date: Mon, 6 Apr 1992 16:01:39 GMT

Please give me your opinions- what's the best full-featured head unit for under
2 bills?

- Peter
From: gt9605a@prism.gatech.EDU (Arlo James Aude)
Newsgroups: rec.audio.car
Subject: Re: 6th Order Band-Pass?
Keywords: subwoofers, 6th order, Band-Pass
Date: 10 Apr 92 07:00:17 GMT
Organization: Georgia Institute of Technology

David,

  Technically what you have there is a sixth order bandpass, but since the rear
port is only 1" in diameter, it's affect can be accounted for more by
thinking of it as an enclosure loss rather than a resonanting vent(especially
if it is very short)
  I suggest changing it to at least a 3" port, and readjusting the length for
the new area, otherwise all you have is a fourth order bandpass enclosure
with a lot of loss which is probably costing you a lot of efficiency.

-- 
Arlo James Aude
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt9605a
Internet: gt9605a@prism.gatech.edu
From: heath@gacvx1.gac.edu
Newsgroups: rec.audio.car
Subject: 4th Order boxes..........
Date: 17 Apr 92 05:37:09 GMT
Article-I.D.: gacvx1.1992Apr16.233709.1
Organization: Gustavus Adolphus College, St. Peter, Minnesota
Nntp-Posting-User: heath


	This is for all the people that used the equaions in Brian's post
concerning forth order enclosures.
	Just cheaking to see if I am totally wacked or what....


I did the equations on a Kicker C-12, C-10, and C-8 first.  The results seemed
way too small. Anyway, here they are.

	C-8			C-10*			C-12
Vas 	 1.2		   	 4.3			 2.74
Qts	 0.338			 0.37			 0.319
Fs	31			27.3			17
Fl	30			30			30
S	 0.7			 0.7			 0.7
Vp	 0.268			 1.5			 0.546
Vs	 0.6			 1.8			 0.45
Fo	53.69			49.95			45.30
Fh	96.09			83.17			68.40

*these stats were taken from Car Stereo Review..and they seem more acurate. 
The stats from the C-8 and C-12 were given to me by J.C.  But..I converted the
Vas from liters to ft^3.   I think I may have screwed up.  If this is my error
someone PLEASE tell me.  

Anyway, I just wanted to see if these figures were in the ballpark or what. 
Thanks.

Heath
Newsgroups: rec.audio.car

/ col:rec.audio.car / frank@owlnet.rice.edu (Franklin Tae-Sung Kang) / 11:03 pm  Mar 30, 1992 /
> I've uploaded a test that sees how much you know about being an 
> installer.  The program asks you up to 60 questions about basic
> electricity, grounds, speakers, cars, amplifiers, etc in a multiple
> choice format.  It was a little tougher than I thought!  Anyways, you
> can get it from the rec.audio.car archive (192.55.239.13) - please
> don't ask me for it as I don't have a mailable version.  The program
> is for IBM/DOS machines.

How do I get it?  I tried anonymous ftp, but it doesn't appear to be set
up.

Rick
rcm@col.hp.com
Newsgroups: rec.audio.car
From: granteri@pnet51.orb.mn.org (Grant Erickson)
Newsgroups: rec.audio.car
Subject: Re: Speaker Connections
Date: 16 Apr 92 20:21:58 GMT
Article-I.D.: orbit.7492
Organization: People-Net [pnet51], Minneapolis, MN.

brian@navaho.ugrad.ee.ufl.edu (Brian Gentry) writes:
>
>
>This method is used by a lot of amateur car stereo installers.  
>Unfortunately, you can do a lot of damage to the computer system in
>your car if you touch the wrong wire.  In newer cars which have 
>computer equipment strewn throughout them, you can do some very expensive
>damage by putting voltage on a lead that goes to a computer.  In fact,
>even using an ohm-meter you can damage computer equipment, because an
>ohm-meter puts out voltage as well.  The safest way to check, is to use
>a voltmeter on any wire you think might be a speaker wire.  If it is a 
>speaker wire, then when the car is on (or off) there will be no voltage
>present.  If there is voltage on the wire, then you don't have the right 
>wire.  
>
>
>                       Brian L. Gentry
>                 (brian@sioux.ugrad.ee.ufl.edu)


This post is not intended as a flame, merely a clarification. If the installer
were doing the said test, he would be aware which wires the speaker ones were.
At the back of a factory radio there _should_ only be these wires present:
speaker, ground, power, illumination circuit wire, antenna, and perhaps a
DIN-8 harness for other factory audio toys. Anyone who is wise and is
replacing a factory stereo and using the factory cabling (unwise when adding
an amp) _should_ obtain a schematic from the dealer. I had a friend who put
the the power lead to a speaker output and fried a $400 CD player dead.

Disclaimer: My opinions are my own, and you can't have 'em! :-b'

UUCP: crash!orbit!pnet51!granteri
Xref: sparky rec.audio.car:1928 rec.autos:10832 misc.consumers:10144
Newsgroups: rec.audio.car,rec.autos,misc.consumers
Subject: Re: Honda factory radio comments? Problems?
From: rbp@investor.pgh.pa.us (Bob Peirce #305)
Date: 4 Apr 92 21:07:18 GMT
Reply-To: rbp@investor.pgh.pa.us (Bob Peirce #305)
Organization: Cookson, Peirce & Co., Pittsburgh, PA

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.  There is a noticeable

I have a 1992 Prelude and my daughter has a 1992 Accord.  There are no
discernable problems with the radio in either.  The fact you only have
the problem sometimes suggests you may be trying to listen to stations
that are too far away.  In most radio designs there is a trade-off
between fidelity and sensitivity.  The tuners with the best sound often
don't have the best range.  I haven't used my tape player but I find FM
does not measure up to the sound available from LPs and better CDs.  It
ought to be competitive with all but the best tapes.  AM is another
story.

BTW, a lot depends on what you are used to.  I have a very good stereo
system at home and no car radio I have ever heard can match it.
Nevertheless, the Honda radios do a reasonable job.
-- 
Bob Peirce, Pittsburgh, PA         rbp@investor.pgh.pa.us         412-471-5320
venetia@investor.pgh.pa.us [NeXT Mail]  !uunet.uu.net!pitt!investor!rbp [UUCP]
From: th23+@andrew.cmu.edu (Thomas Hans Henke)
Newsgroups: rec.audio.car
Subject: Re: Help on Isobarics??
Date: 7 Apr 92 03:52:57 GMT
Article-I.D.: andrew.kdsFmNa00WBLA=W1gZ
Organization: Freshman, H&SS general, Carnegie Mellon, Pittsburgh, PA

What the hell does isobaric mean?  Airtight vent seems to be a
contradiction in terms.  You must be from Florida or something, and
probably drive an ugly old Camaro. . .  .
                                                        
P.S. Is this reply good enough?
Organization: Sophomore, Math/Computer Science, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.audio.car
Date: Wed, 15 Apr 1992 00:03:26 -0400 
From: "Robert W. Igo" <ri09+@andrew.cmu.edu>
Subject: Re: Speaker Connections

Polarity matters in some sense when you're hooking up speakers.  As I under-
stand it, if you have two speakers hooked up with opposite polarities, one
will be "inhaling" while the other is "exhaling."  Meaning you don't quite
get the best combined sound.  Actually, one of the reasons I'm replying is
so someone can tell me where the holes in my knowledge of this subject are.

I don't think you can blow up a speaker by hooking it up in reverse polarity,
since it's an AC signal anyway, but I may be wrong.

--Bob
Newsgroups: rec.audio.car
From: cliff@spdcc.com (Cliff Spencer)
Subject: Saab 9000 factory system
Organization: S.P. Dyer Computer Consulting, Cambridge MA
Date: Mon, 13 Apr 1992 18:26:23 GMT

What is the weak link in the factory installed Clarion system
that goes in the 9000 turbo? I hear big gaps in the response that 
their octave-or-whatever equalizer can't fix. Is it the speakers
or the electronics. Also, has anyone retained the equalizer and replaced
the tuner/tape with another unit?
					-cliff
-- 
Cliff Spencer cliff@spdcc.com
Newsgroups: rec.audio.car
From: ravalent@rodan.acs.syr.edu ()
Subject: System for a Convertible
Organization: Syracuse University, Syracuse, NY
Distribution: usa
Date: Wed, 8 Apr 92 16:40:44 EDT

Hi all- 

    I just started reading this group, and I like what I've seen so far.
Now, I need some help setting up a system in my 71 Olds convertible.  

Right now the car has:

      Pull-out Pioneer 1700kr, your basic tape/radio combo
      Kenwood 6" rounds in the doors
      STOCK (1971) 4x5 speakers behind the rear seat 
      Small amp (10x10 ?) driving the rear speakers

What I want to acomplish:

      Keep existing radio
      Needs more bass.
      ABSOLUTELY cannot cut any holes in existing interior panels.  
      Would like to be able to hear bass when the top is down at 
      more than 55 mph (I never speed.. =8^>).
      Have ~400 bucks to spend.  Would like to keep it cheaper, tho.

I just added two Motarola tweeters into the speaker grill in the dash, which
gave me hi-freq. to bounce off the windshield.  It sounds good.  
I also have a 40x40 jensen amp, with low-level inputs that my radio can 
 support.  The output from the radio's amp is so low that it really needs 
to be amped to sound good. 
I was thinking of adding two 10" woofers behind the rear
seat and amping them with either 50x2 or 100x2.  

I listen mainly to heavy metal (metallica) and hard rock.  I don't need a 
system that you can hear the base four blocks away.  Quality over Quantity,
but I can't afford those Rockford/Fosgate Pro's =8^(.

Any suggestions appreciated ----> Bob  (ravalent@rodan.acs.syr.edu)
From: mitch.blades@cccbbs.UUCP (Mitch Blades) 
Newsgroups: rec.audio.car
Subject: VOLTAGE CONVERTER
Date: 13 Apr 92 17:34:00 GMT
Distribution: world
Organization: Cincinnati Computer Connection BBS - Cincinnati, OH - 513-752-8248
Reply-To: mitch.blades@cccbbs.UUCP (Mitch Blades) 

NG>   I have a 6 volts VW car radio which I would like to run on my new
NG>12 volt battery car.  I want to build a 'voltage converter' that would allow

Well I'd try a resister myself.. just go to radio shack..


 * OLX 2.1 * It's only a hobby ... only a hobby ... only a
                                                                                                                
Newsgroups: rec.audio.car
From: biancol@bullet.ecf.toronto.edu (BIANCOLIN  FABIO S)
Subject: Re: 12" driver recommendation?
Summary: Check last months CAE 
Organization: University of Toronto, Engineering Computing Facility
Date: Fri, 10 Apr 1992 03:35:57 GMT

In article <8APR199215455186@lims02.lerc.nasa.gov> yystg@lims02.lerc.nasa.gov (STEVE GRAHAM) writes:
>I'm looking for a 12" sub to run in a sealed enclosure.  I want one that 
>has a low Vas and an Fs in the high teens or worst case very low 20's.
>
>I'm going to use a sealed box and pump about 100 watts into each one.
>
>If there are any 10" subs that also meet these requirements, I'd like to 
>know about them, also.
>
>Any recommendations would be appreciated.
>
>S. Graham

	Well, I last months Car Audio and Electronics, they do a review
of 8 12" subwoofers, 4 in sealed enclosures, 4 in vented.  
  They rated Petras, Stillwater Competition and Mtx  1,2,3 respectively. 
  Good luck
Fabio
:
: