HDTenEightyP/NetNews huggingface dataset:
From: laflisc@wkuvx1.bitnet
Newsgroups: rec.audio.car
Subject: Re: Polk MM3065 Opinions
Date: 11 Nov 92 03:24:15 GMT
Organization: Western Kentucky University, Bowling Green, KY

In article <1992Nov10.165211@usho72.hou281.chevron.com>, hhtra@usho72.hou281.chevron.com (T.M.Haddock) writes:
> 
>  I've been looking at the Polk MM3065 component speaker set.
>  The set consists of the the Polk MM6510 6.5" midbass and 
>  the Polk MM3000 1" tweeter and external passive crossover.
>  Fr: 35-26khz, Sens: 90db, Pwr: 100w max
> 
>  They sound pretty good - as good as the Boston Acoustics
>  6.2 Pros.  Any other opinions?
> 
> 
>  TRAVIS
>  hhtra@usho21.hou281.chevron.com
>  

Travis,
	Hey man.  For more info than you care to read, just pick up
the December issue of Car Audio and Electronics.  It compares 6.5 and
tweets of Altec Lansing, AVI, Blau, Bostons, Clif Designs, Earthquake, 
and Polks.  There are three graphs and what is called a MLSSA graph. 
It compares time to freq to SPL.  Lots of info.
	I must give this disclaimer though.  I wouldnt buy any
speakers juston this info.  I would want to hear them all for myself. 
	CA&E is a damn good magazine and I would suggest it to
everyone would reads this group.  I love it.
	There is a pretty good article on the three general types of
speaker enclosures in this months.  I just got it today so I havent
really had a good chance to read it, but I will, dont worry.  :)

					all 4 now,

					Scott
Newsgroups: rec.audio.car
From: underdog@leland.Stanford.EDU (Dwight Joe)
Subject: Installing a Radio?
Organization: Miners for a Heart of Gold
Distribution: na
Date: Sun, 8 Nov 92 02:39:56 GMT


(I didn't get many responses, so I'm posting again. _Please_ help
me out; I just cannot drive at 80mph without any Def Leopard in the
background.  8^)

Some people inquired as to what vehich on which I am hoping to install
a radio.  Well, I'm trying to install a radio on a lowly Sentra.)

Does anyone have experience with installing a radio?
 
If so, could you please post how to do thusly?  For starters, how
do you get the plastic cover off the face of the dash board; the cover is
intended to hide the gaping hole where the radio is supposed to be
placed.  Currently, there is no radio in the car; there's just a plastic
cover over where the radio should be.  (The plastic cover seems to be
an integral part of the dashboard; how the heck do I remove it?)

My aim is to insert a 1-speaker radio into the car.

------------------------------------------------------------------+------------
Jinsei no imi wa nan desu ka.                Sister, can you      |   \|  |`
Shitte itara oshiete kuremasen ka.           spare a coin?        |    | -+-
                                                                  |   /| / \
Copyright 1992.  Disclaimer:  1 + 1 = 3                           |
------------------------------------------------------------------+------------


Newsgroups: rec.audio.car
From: "glen mead" <glen.mead@canrem.com>
Subject: profile amps?
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: rec
Date: 5 Nov 92 22:02:35 EST

Hi All,

What is the general net.wisdom opinion on Profile amps?  I get the
impression that they bridge the gap between inexpensive japanese amps and
better quality US made amps.  Why I ask is that I have an opportunity to
pick one up fairly cheaply and it might fit my needs...at least until I
can afford a better amp.  Any comments on these?

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
From: philip@hpsgrt1.sgp.hp.com (Philip LOH)
Date: Wed, 11 Nov 1992 02:30:08 GMT
Subject: Re: Capacitors, etc... CALMLY
Organization: APCD, Hewlett-Packard Singapore
Newsgroups: rec.audio.car

I used to have those Infinity Kappa CSI component speakers in my
car and the instruction given by the manufacturer is :"Never
connect the mid and high direct to the amp output."   You
have to connect the passive crossover between the amp and the
speakers.  I am now adding an active cross-over (electronic
crossover SONY XEC700) to the system.  Reason being that I 
am adding in more amps and speakers.  I am planning to use
dedicated amp for each of those speakers.  Do I still need
to obey the manufacturer's instruction of putting the 
passive crossover in ? What's going to happen if I do not ?
am adding in more amps and speakers.  I am planning to use
Please advise.
Newsgroups: rec.audio.car
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Call for Papers/Posts
Reply-To: demaine@ee.ualberta.ca (Cal Demaine)
Organization: University of Alberta Electrical Engineering
Date: Thu, 5 Nov 1992 23:57:03 GMT

Realizing that we have a large number of readers, and a fair number of
active and informed regulars, I propose we pool our resources.

While everyone has the token "ObRAC: This would be in the FAQ, if we had one",
there are areas which we could expend effort to improve not only a FAQ, but
our own knowledge as well.

What I'm saying is that we attempt to explore 'new' car audio fields as a
group, with the results posted for everyone.  We could organize a topic,
distribute background information, and disperse to our own devices for
experimentation.

I'm not talking about pushing the envelope of knowledge, designing our own
general purpose sub/servo system, or anything of the like.  Just fooling with
some areas of interest.

  Three areas I'd like to propose research in are:

  1.  Sound/Vibration damping:  Dynamat currently _owns_ this market, but I
      strongly believe that if we each tried a different substance, someone
      will find a cheap substitute.
      This is an important area for improving daily listening, even though
      it doesn't do squat for your competition scores.

  2.  Subwoofer responses in free air vs. the car:  While far too much time
      is spent on multi-order subwoofer design already, this is an area
      that could use a little more information.
      That 57th order box may look swell on paper, and may test somewhat
      close to design in free air, but if it's in a car, it's not acting
      anything like what it was designed to.
      It would be swell to know what the magnitude of the problems in this
      area are, because, basically, all those subwoofer programs are cranking
      out 80% garbage in most cases.

  3.  Typical and peak voltages and currents in your audio system:  How much
      is being drawn, with what effect, and what's the IASCA rating of the
      car?  What length of musical peaks are encountered, at what level,
      and what is the typical dynamic range of the system at listening
      levels?  Numeric/audible improvements with stiffening caps?

Personally, I'll be fooling with (1) in the upcoming weeks, and (2) as soon as
I get my new frequency generator, and (3) all the time, although I haven't
been recording any data.

So, is anyone else with me?  Are there any other areas we should look into
now or in the future?  If others are wanting in, I'll post more information on
how we'll do the information gathering, set up the general information and
experiments for those who don't want to devise their own, etc.

Email me, please, or reply on the group to voice your loud support.  Thanks.

-- 
  - 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
From: hhtra@usho72.hou281.chevron.com (T.M.Haddock)
Newsgroups: rec.audio.car
Subject: Polk MM3065 Opinions
Date: 10 Nov 92 22:52:11 GMT
Organization: Chevron


 I've been looking at the Polk MM3065 component speaker set.
 The set consists of the the Polk MM6510 6.5" midbass and 
 the Polk MM3000 1" tweeter and external passive crossover.
 Fr: 35-26khz, Sens: 90db, Pwr: 100w max

 They sound pretty good - as good as the Boston Acoustics
 6.2 Pros.  Any other opinions?


 TRAVIS
 hhtra@usho21.hou281.chevron.com
 
Newsgroups: rec.audio.car
From: mgarber@magnus.acs.ohio-state.edu (Max D Garber)
Subject: Re: DREAM SYSTEM...
Organization: The Ohio State University
Date: Thu, 12 Nov 1992 15:55:56 GMT

>I also have a request about what you think the ultimate dream system
>would be- with amps and all!!!

If I were to begin listing the dream system I could go on and on.  Plus
tomorrow everything would be out-dated anyhow!
-- 
THE HYPEMAN.
1983 Pontiac 2000 SE   1983 Honda Nighthawk 650   DECEMBER 12,1992
   "BABY BOOOM"             MINT CONDITION         "TIE THE KNOT"
 'SYSTEM FOR SALE'      "FOR SALE"-Best Offer!     ^^Any Advice?^^
From: gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON)
Newsgroups: rec.audio.car
Subject: Re: Suitable Capacitor?
Date: 6 Nov 92 14:52:39 GMT
Organization: Georgia Institute of Technology

In article <1992Nov5.210455.13631@eng.ufl.edu> brian@omaha.eel.ufl.edu (Brian Gentry) writes:
>objective could be filtering, but the frequency of the alternator should
>not be high enough to be influenced by the ESL of the capacitor.  Besides
>the battery usually does a very good job of filtering the output of the
>alternator.

Well, usually, but not always. I have a good friend who is into high-power
alternator design; we were just having a discussion on transient voltage
spikes created in alternators from "stray inductance" (I don't remember
the source; methinks diode non-linearity may have also been a factor). 
Anuhow, the point is that alternators especially big ones, can generate
spikes of up to 80 VDC (!) in NEGATIVE polarity (!!). This can potentially
not only cause engine type noise but can destroy computers, etc. To combat
this, by friend uses both zener diodes in reverse bias in the rectifier
bridge, and he recommends the usage of a stiffening cap with his really
large alternators. Most alternator companies do not even acknowledge 
this effect, although the new big Wrangler seperate-diode bridge models
have the zeners. BTW, the spikes were observed in a charging system with
a rather large battery; with the zeners and caps the spikes were reduced
to less than 1-2 volts AC, which most amp power supplies could easily 
filter out.

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: jsmith@ug.cs.dal.ca (Jeff N Smith)
Subject: System for a Jeep
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada
Distribution: na
Date: Thu, 5 Nov 1992 17:13:48 GMT

Hi There,

	A friend asked me if I could give him some help designing a system
for his Jeep YJ.  Does anyone out there have any ideas or experience with
this type of vehicle?  Please e-mail or post any help!

Thanks
Jeff Smith	jsmith@ug.cs.dal.ca

Newsgroups: rec.audio.car
From: jleung@ux4.cso.uiuc.edu (A St. Xavier alum)
Subject: Re: Radar Deflector [was Re: Passaport radar detector (really ECM) ]
Organization: University of Illinois at Urbana
Distribution: usa
Date: Tue, 10 Nov 1992 07:59:08 GMT

rslau@usc.edu (Robert Lau) writes:

>In article <1992Oct28.172407.7793@i88.isc.com> ez@laiawake.i88.isc.com (Ezra Goldman) writes:

>   I purchased a Radar Deflector from Dynaspec in Westmont IL who claim
>   that it legally confounds X and K band radar to the point where you
>   can stealthily zip by a police radar trap with nary a ripple on the
>   ether. It is truly a "black-box". Only has a glowing LCD. Sits on the
>   dashboard, powered by 12-volt. Looked inside and saw what I think is
>   a little wave guide and a few chips.

>Don't fool yourself, it can't be legal, no matter what they say.
>True, there are frequencies/power levels that you can transmit on/at
>that don't require you to have an FCC license, but anything that would
>interfere with a radar gun would definitely need FCC certification.
>CB's used to interfere but that was with old guns.  I haven't seen
>this Deflector box, but if all it does is cause the gun to display
>random/fluctuating speeds, then it's pretty simple.  More complicated
>boxes will let you 'dial-in' the speed you want the gun to display.
>All this stuff is 100% illegal and you will get pretty badly slammed
>if you're caught with it.

>   Their literature has nice stories about the guy in the red corvette in
>   San Diego who sped back and forth in front of the auto-speedtraps
>   because he couldn't believe that they weren't registering his speed.

>Hah, if you're flying by at 80mph in a 45zone, the cop can pull you
>over on visual alone, they are trained for that stuff ya know :)
>Then again, the brochure didn't say if the dork was later ticketed...
>Let's see, how many violations must one pick up in a quarter-mile to
>get the beloved reckless driving award?  :)

>   Will anyone out there admit to owning one? Using it? Testing it against
>   a radar source?

>No comment :)


SEND THAT CONFOUNDED DEVICE BAKC AND ASK FOR A FULL REFUND NOW!!!!!!!!!!
My friend bought the SAME device with one RED led on the front panel
And we asked our policeman friend to clock us to see if this jammer
worked.  Guess what......the policeman clocked us and got our
speed EACH TIME!!!!  This thing is a fraud, and my friend got a refund
>-- 
>Robert Lau - Systems Programmer, Unix Systems     213-740-2866
>--  University Computing Services                 Internet: rslau@usc.edu
>--  University of Southern California             Bitnet:   rslau@uscvm
>--  1020 W Jefferson, LA, CA  USA, 90089-0251     UUCP:     ...!uunet!usc!rslau
From: rslau@usc.edu (Robert Lau)
Newsgroups: rec.audio.car
Subject: Re: DREAM SYSTEM...
Date: 13 Nov 1992 20:52:33 -0800
Organization: University of Southern California, USA
NNTP-Posting-Host: tarazed.usc.edu
In-reply-to: miarmijo@nmsu.edu's message of Tue, 10 Nov 1992 21:13:14 GMT

In article <1992Nov10.211314.12013@nmsu.edu> miarmijo@nmsu.edu (Michael Albert Armijo) writes:

   I also have a request about what you think the ultimate dream system
   would be- with amps and all!!!

The ultimate system would tap directly into your auditory nerves...
No phase problems, wierd car acoustics, enclosures, etc, just pure
'sound'!!!  And kids, it won't even destroy your hearing* cuz it
bypasses the inner ear!

Place your orders now!  Operators are standing by 24 hours a day.
Money back guarantee if you're not satisfied**!

<small print>
* constant stimulation of the auditory nerve has been shown to cause
hearing loss in laboratory spinach plants

** You will have to sign a waiver to cover possible complications that
may arise during the operation

:)
-- 
Robert Lau - Systems Programmer, Unix Systems     213-740-2866
--  University Computing Services                 Internet: rslau@usc.edu
--  University of Southern California             Bitnet:   rslau@uscvm
--  1020 W Jefferson, LA, CA  USA, 90089-0251     UUCP:     ...!uunet!usc!rslau
From: dsg@cci632.cci.com (Dave Greenberg)
Newsgroups: rec.audio.car
Subject: Box porting
Date: 12 Nov 92 18:36:23 GMT
Organization: [Computer Consoles, Inc., Rochester, NY


	Hi all,

	I am currently building a box for my Mitsubishi 3000 GT. It is 
shapped really bizzare (70, 20, 90 degree triangle, with a "cube" attached
to the back to give me 1.3 cuft of space for an Orion 10" DVC (XTR).
Basically, it should be ported (2" diameter, 2 3/8" length) my question
is:  How will port placement affect the sound? Ideally, I would like to
put the port approx. 90 degress (on a different face of the box) from the
woofer...is this a problem. What about if I put it 180 degrees (out the
back of the box)? (The woofer fires into the rear seats)...

	Any ideas??
	
						Dave
From: rslau@usc.edu (Robert Lau)
Newsgroups: rec.audio.car
Subject: Re: Some ALPINE Wiring Question
Date: 13 Nov 1992 21:01:54 -0800
Organization: University of Southern California, USA
Distribution: na
	<12NOV199209353876@lims01.lerc.nasa.gov>
NNTP-Posting-Host: tarazed.usc.edu
In-reply-to: yystg@lims01.lerc.nasa.gov's message of 12 Nov 1992 09:35 EST  

In article <12NOV199209353876@lims01.lerc.nasa.gov> yystg@lims01.lerc.nasa.gov (STEVE GRAHAM) writes:

   In article <1992Nov11.130840.1143@bmerh85.bnr.ca>, ehawrysh@bcars6e7.bnr.ca (Evan Hawrysh) writes...
   >Brown w/white: in pause (I've never seen Alpine explain this, but I suspect
   >it either puts out 12VDC when the unit is paused (do you have a pause button?)
   >or will pause the unit when 12VDC is applied. Can anyone confirm this?

   I believe this is the wire that will mute/pause the unit when your cellular 
   phone rings.  I would assume that the (Alpine) phone turns this on by 12v+.

Yup.  It's quite annoying though when I *want* to play a song for
someone on the phone...  It pauses your tape or cd, and mutes the
tuner whenever the phone is in-use.  Most cellular car kits have a 12V
out line for this purpose...

-- 
Robert Lau - Systems Programmer, Unix Systems     213-740-2866
--  University Computing Services                 Internet: rslau@usc.edu
--  University of Southern California             Bitnet:   rslau@uscvm
--  1020 W Jefferson, LA, CA  USA, 90089-0251     UUCP:     ...!uunet!usc!rslau
Newsgroups: rec.audio.car
From: gilchr@ee.ualberta.ca (Andrew Gilchrist)
Subject: Re: Crossover Questions
Organization: University Of Alberta, Edmonton Canada
Date: Fri, 13 Nov 1992 07:04:33 GMT

chiu@gpb-mac.sps.mot.com (Norman Chiu) writes:

>>  If I have a midbass that has a range of 50-3000 Hz and a tweeter
>>  with a range of 3000-22000k Hz, would it be okay/safe to use an
>>  active crossover point of 3000 Hz with 18 dB slopes?
>> 
>>  If not, what crossover point and/or slope would be okay/safe?

>The crossover point of 3K Hz should be ok; but I think the slope
>should be 6dB, at most 12dB, and definitely NOT 18dB.  Generally,
>you want the high frequency contents of the audio signal to die
>down slower, so a better and detailed sound image can be present.

I'd say you are wrong. If the driver is spec'd at 3kHz +, the response
is probably already -1 or 2 dB. Maybe more.  Putting a crossover point here
would be a bad idea, since the response will drop to -5dB or more.
Furthermore, driving appreciable amounts of energy into a a tweeter
at frequencies it was not designed to handle (that is to say, frequencies
lower than it was designed to handle) can do it much harm.

Since this is an active crossover, a 12dB slope can provide a maximally
flat response (note: CAN). An 18dB slope should be fine as well unless
for some reason:

>you want the high frequency contents of the audio signal to die
>down slower, so a better and detailed sound image can be present.

Now, what's the point here? The crossover is designed to give flat
system response.  The high frequency sounds don't die down at all.
I can't imagine why a tweeter would sound better if the input had a
shallower frequency envelope.  I CAN see why a tweeter would sound
better if you don't push the lower range, due to a reduction in
Doppler distorion.  Perhaps this is where your information comes
from.

Please relate the story you got this information from.

[note: xover points for minimal Doppler distorion should be around
	200Hz and 2kHz]

Andrew
Newsgroups: rec.audio.car
From: gilchr@ee.ualberta.ca (Andrew Gilchrist)
Subject: Re: Suitable Capacitor?
Organization: University Of Alberta, Edmonton Canada
Date: Fri, 6 Nov 1992 09:37:35 GMT

This is a bit of a digression, but the post is addressed to me, so I
feel compelled to rant.

yystg@lims02.lerc.nasa.gov (STEVE GRAHAM) writes:

>In article <gilchr.720958980@ee.ualberta.ca>, (Andrew Gilchrist) writes...
[relevant stuff deleted]
>>electrolytics (particularly LARGE ones) are constructed.  It gives them
>>a noticable series inductance.  High frequencies are rejected by this.
>                                 ^^^^^^^^^^^^^^^^
>>Thus the need for higher frequency bypass capacitors (small caps).
>>Why have you never heard of such a thing in a power supply application?
[ranting deleted]

[Steve's question/assertion/whatever]
>They are talking about DC current.  Please explain to me the need to pass 
>high frequencies, or any frequency, for that matter.  I must be missing 
>something.

>S. Graham
Yes.  You must be.  Did you READ the post, or was is too early in the
morning?  Were you blind stinking drunk, or what?  [Not enough
typos... I guess you were sober.]

I'll give you the benefit of the doubt, and assume that the whole issue
is justifiably confusing to you.

If you draw a time-varying current from a DC source, you can use
Fourier analysis to break the time-varying current into different
FREQUENCIES.  If the power supply has a high impedance to one of these
frequencies, it will affect the VOLTAGE REGULATION at the load.

With me so far?

Okay, so the VOLTAGE regulation goes to hell.  This implies that our
LOAD [the amplifier] will no be able to draw as much current as at
full voltage.  An ideal voltage source has ZERO impedance, at all
frequencies.  It will deliver 100% regulation at the load for any
time-varying load.  Your car's charging system, needless to say, is
NOT an ideal voltage source.  The cables from the battery to the amp
yield a REACTIVE impedance.

Thus, your amp sees an impedance to the voltage source.  The addition
of SHUNT capacitance serves to CANCEL OUT the effects of the SERIES
inductance of the wiring.  If you don't see how, just take my word
for it.

You can look at it the other way too...
the capacitors act as low impedance sources of current.  When the
impedance of the charging system is high enough to affect voltage
regulation, [such as during a sharp load increase] the capacitors
supplement current by acting as low impedance batteries.

BUT, as I said, large electrolytics have a series inductance.  At high
frequencies (sharp current demand changes) this inductance
affects voltage regulation as well.  So, we add a small capacitor
with a much lower series inductance in parallel.


If I have made myself unintelligible through attempts to simplify, while
not defining all terms excruciatingly clearly... too bad.


Andrew Gilchrist
Newsgroups: rec.audio.car
From: aeulogio@uhunix.uhcc.Hawaii.Edu (Eulogio Apelin)
Subject: awia amp
Summary: are they any good.
Organization: University of Hawaii
Date: Thu, 12 Nov 1992 00:47:14 GMT


Has anyone have any experience with aiwa amps? Are they still in bussines? hmm?
I am interested in getting the aiwa MA-8500 in the DAMARK mail order catalog.
They are selling it for 179.99. It's 3/5 channel with 380 watts total. Is it
worth it? If you have any knowledge about aiwa and their products or of this 
model please e-mail me any bad comments or high praise. Has any had any
dealings with DAMARK?

Much MAHALO in advance. 
Newsgroups: rec.audio.car
From: tjd28@cas.org ()
Subject: Amp problem (I think)...
Organization: Hapless Hackers Corp. Columbus, Ohio
Distribution: na
Date: Mon, 9 Nov 1992 17:33:36 GMT


For the last week, my right rear 6x9 has been barking during
all mid-bass hits, so, I isolated all the speakers on that channel
of the amp and found that not only did my 6x9 distort but also
my 5 1/4's and my tweeter.  So, it has to be the amp.  My question
is what does it sound like and how much can I expect to be robbed
of to fix it.  It is a Punch45.  Thanks.

Thanks alot,

Trav
tjd28@cas.org