HDTenEightyP/NetNews huggingface dataset:
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: pro logic
Keywords: how does this work
Date: 7 Oct 92 19:55:13 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA

In article <3901@faatcrl.faa.gov> frankc@faatcrl (Frank Coffman) writes:
>I'm about to upgrade my stereo system and am starting to look around at
>receivers.  I'm interested in getting one with pro logic, and I understand
>what it does, but I don't understand HOW it does it, and the salespeople
>I've talked to obviously don't know themselves.
>
>Does it just work on recorded media?   
>
    No.  Whether it works at all on recorded media depends on
    whether or not the recording has Dolby Surround encoding.

    You can get SOME "effect" on non-encoded material, but its just
    an artifact....whether it is pleasing or not is a personal
    judgement issue.

>Does it do it's thing on regular TV broadcasts?
>
    If they are Dolby Surround encoded, yes.

>Is this a flash in the pan?
>
    Isn't everything?

>Is it time to buy or is the technology still unfolding?
>

   There's lotsa programming out there that is Dolby Surround
   encoded.   

   Pro-Logic is just an enhancement to the decoder....
From: kap@eng.cam.ac.uk (Kevin A. Price)
Newsgroups: rec.audio
Subject: Mission 770's
Date: 14 Oct 92 13:32:20 GMT
Organization: cam.eng

Hi, I've got a pair of Mission 770's that I purchased second-hand,
could anyone with a pair of them please send me a photo-copy of the 
manual? Or, failing that, the essential information regarding speaker
placement, ie distances from walls, floors etc?

Please e-mail me as I don't get to read this group.

Thanks everso much in advance.

Kev :)
e-mail kap@eng.cam.ac.uk
Phone UK (0223) 332764
From: DPierce@world.std.com (Richard d Pierce)
Newsgroups: rec.audio
Subject: Re: Quality of Speaker Wire Inside your Speakers
Keywords: speaker wire, crossovers, still going
Date: 11 Oct 92 21:46:14 GMT
Organization: The World Public Access UNIX, Brookline, MA

In article <1992Oct9.230641.9821@cuug.ab.ca> (Terry Ingoldsby) writes: >
>>I have wanted to try and upgrade my speakers but as funds are low I
>>thought that I would open up my speaker cabinets (v. carefully!) and see
>>what the cross-over to speaker connection wire looked like. To my horror
>>the wire is just ordinary CRAPPY basic connection wire that one would
>>use for soldering between a switch and printed circuit board in a
>>school science room!

>And what will you do about the approximately 200 feet of (probably) 18
>gauge wire in the crossovers.  Not to mention the 18 gauge (i.e. thinner)
>wire that is almost certainly used in the voice coils?  This could turn
>out to be an ambitious project!

Just for laughs, I thought I might provide some real numbers here. In a
"typical" voice coil, let's say for a high-quality 8" woofer with a 4
layer 1.5" voice coil you might have around 25 meters of 29 AWG soft-drawn
enameled copper wire, with a total DC resistance of about 7 ohms or so.

Your inductors will have more like 15-20 meters of anywhere from 14 to 22
AWG wire with DC resistances around 0.1 - 0.5 ohms or so.

Shall we worry about the "CRAPPY basic connection wire?" The answer is left
as an excercise for the student...

-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |
Newsgroups: rec.audio
From: wwein@scott.skidmore.edu (warren wein)
Subject: Good portable Disc players?
Organization: Skidmore College, Saratoga Springs NY
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 7 Oct 1992 23:16:58 GMT


	Some of you may remember that I was having problems with my
Sony D-55.  It was skipping a lot when playing certain cds.  Well I
solved that problem when I roasted it.  I had left it on a shelf
underwhich there was a lamp, which got very hot.  The radio on it
still works but none of the disc controls respond.   I was thinking of
getting a new one  and was wondering if anyone has had any experience
with any Kenwood players or Sony's D-555 and D-303.  My friend had to
return his D-555 because he said it skipped at the slightest touch.
Any other suggestions would be appreciated.  Thanks in advance.

						- Warren
						wwein@skidmore.edu
-- 
-----------------------------------------------------------------------------
" Female Cathon choose their mates by the size of their balls." 
" In no sense? Nonsense!"
Warren Wein
Newsgroups: rec.audio
From: resou@darcy.mi.uib.no (Odd Arild Urtveit)
Subject: Re: Golden Ears?
Organization: University of Bergen, Norway
Date: Wed, 7 Oct 92 10:50:28 GMT

In article <23819@alice.att.com>, jj@alice.att.com (jj, all-around curmdgeon and outright grough) writes:
> In article <1992Oct6.024047.21236@sol.ctr.columbia.edu> crgoc@orlando.uk.cray.com (Gary O'Connor) writes:

> >|> >Who in this group can here if the speakers are reversed polarity?
> >|> >what are these audible effects.
> 
> >|> Maybe audible, may not be.
> Certainly audible if you have cheap loudspeakers, no doubt about that.
> Less so if you use good headphones...
> 

I have to make a comment about this.  In my Stax Lambda Headphones the effect of reversed polarity is easilly heard.  Theese headphones are by many concidered some of the best in the world.

Odd Arild Urtveit
resou@mi.uib.no
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 8 Oct 1992 17:02:21 GMT
Subject: Re: cables/speakers
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.audio

> 
> You should be able to play about with this on your speadsheet if you can get
> some approx to Z and A, plotting D against w.
> 

ARRRRGGGGGHHHHHHHHH!!!!!

He's using a SPREADSHEET!!!!!!!!


Hey, Graham, don't you read Bob Pease's column in _Electronic_Design_?  :-)



Bob Myers            | "One man's theology is another man's belly laugh." 
myers@fc.hp.com      |                     - Lazarus Long/Robert A. Heinlein
                     |
From: rej@sal.wisc.edu (Randy Jones)
Subject: Re: Black rubber CD rings - Any good ?
Organization: Squelchier Lives Inc.
Date: Wed, 14 Oct 1992 06:22:33 GMT

In article <1992Oct14.053532.18154@news.acns.nwu.edu> andrew@casbah.acns.nwu.edu (Andrew Sung Hyun Kim) writes:
>Can anyone tell me that by adding this ring, what improvement of error rate
>is noticed?  To my feeble understanding, as long as the 0's and 1's are read
>correctly, the sound should be identical.  SO, what you have suggested is 
>that by adding the ring, the error rate was reduced to make the improvement
>in sound.  Can anyone verify this?  Was there any test to show that by
>using the ring such reduction in error in sampling was achieved?

To my understanding, the rubber ring acts as a damper for Nyquist Eddies,
which can squeeze in *between* the bits. Nyquist Eddies cause a kind of
distortion so insidious that it is provably incapable of being
measured by any test instrument. I use the rubber ring, a Faraday cage,
and a temperature-controlled oven (62.5 +- .1 degrees C). I am running
my Sharp DA-100 through twin Crown DC-300As and Minimus-7s. The oven/cage
setup is a bit of a pain but the sound is sure worth it. Or at least
I think so.

-- 
| Randy Jones           | "The electron tube is a marvelous device. It makes
| rej@bob.sal.wisc.edu  |  possible the performing of operations, amazing in
|                       |  conception, with a precision and a certainty that 
|                       |  are astounding."     -- RCA Receiving Tube manual
From: gfl@hera.uucp (22402-lenahan)
Newsgroups: rec.audio
Subject: Re: What are expensive cables?
Summary: diminishing marginal utility.. starts at zero
Date: 15 Oct 92 14:12:25 GMT
Distribution: na
Organization: Bellcore, Livingston, NJ

kevinm@ocf.berkeley.edu (Kevin Miller) writes:
> When people ramble on (and on and on...kinda like the Energizer Bunny) about
> expensive cables, what, exactly, is an "expensive" cable?  Are we talking 
> hundreds of dollars per foot, or is it more on the order of about $1/foot?

My experience is that today, expensive interconnects are around $150 and up
($30/ft terminated), and speaker wires are similar.  Note that I'm not
endorsing this, just helping you calibrate.
> 
> I have Monster cable on my Kenwood receiver that costed me around $20 for 15
> feet.  I realize that this is dirt cheap as far as high-end wiring goes, but
> at what point (I know I'm going to start it with this...) in price does the
> law of diminishing returns take effect?

They _always_ start very low.  Let's use audio as an example.
For $0.50, you get wire that produces sound.  No amount of
money can duplicate the improvement from silence to music,
so your next $0.50 will have a diminishing marginal utility.

But that's not the issue.  You, as a rational consumer (say WHAT?)
are really interested in two different criteria:
	1. where can I buy my greatest benefit for the next $.50?
	2. Is it worth the $.50 to me?

As they say, vive le difference ... I, for one, limit cable
expenditures to about $75/pair (commercial).  Actually I make
my own.  This is where the above constraints do it for ME.
You set you own first derrivitive to zero and solve :-) :-).

Just for the record, I've found that some cables are very
expensive, very high quality, fixed tone controls.  Makes me
a bit wary about paying for 30' pairs of low-level connects.....

-Grant
From: tmills@unpcs1.cs.unp.ac.za (Timothy Mills)
Newsgroups: rec.audio
Subject: UPDATE : Peavey Pro-Fex MIDI Guitar Sound Module !!!!
Date: Mon, 12 Oct 1992 09:12:54 GMT
Organization: Dept. Computer Science, UNP
Distribution: world
NNTP-Posting-Host: pc021.cc.unp.ac.za

Howdee once again,

Sorry to let you know but there was a configuration error in the postage 
of the last letter ! As a result all your replies have bounced and so I 
haven't recieved any ! Please,if you don't mind,could you resend your 
replies by reading the UPDATE article.I have rewritten the last letter below
for your attention.Sorry for the inconvenience.Many thanks.

I read an article on a new guitar sound module,called the Peavey Pro-Fex
MIDI Guitar Sound Module,a couple of months ago.I did not get enough info
from the article so I decided to use the network to hopefully get some !
I would like to know the current price for the sound module from anybody
who has it on hand (never mind the currency).If anyone has had the
opportunity to use the module,some feedback on its capabilities would be
much appreciated.What I would also like to know is what the best MIDI guitar
is,that could be used with the sound module.

Many thanks for your time.

Yours in guitaring
T.J.Mills

( tmills@unpcs1.cs.unp.ac.za or tmills@unpsun1.cc.unp.ac.za )
From: rjudy@dime.cs.umass.edu (Judy Ruot)
Newsgroups: rec.audio
Subject: Pioneer PL400 and PL518 turntable problem
Date: 15 Oct 92 19:16:37 GMT
Reply-To: rjudy@dime.cs.umass.edu (Judy Ruot)
Organization: University of Massachusetts, Amherst


  I have a 518 and someone I know has a 400 and they have the
   same problem in that they lose sync and regain it and lose
   it again. Is there a phase locked loop chip in there that
    could be unhealthy?  Please send responses to 
    rjudy@cs.umass.edu or rob@cs.umass.edu.

Thanks.

Judy and Rob
From: cutler@equator.com (Ben Cutler)
Newsgroups: rec.audio
Subject: Washington State HiFi Dealers
Date: 9 Oct 92 20:23:22 GMT
Distribution: na
Organization: Equator Technologies, Inc., Seattle, WA

I'm planning on purchasing some high-end audio equipment in the near
future.  If anybody has any experience with Definitive Audio in
Seattle, Legendary Audio in Bellevue, or Nuts about HiFi (also known
as U2) in Silverdale, I'd be interested in hearing about it, either
good or bad.  Know of any other dealers worth checking out?

Since I'm mostly interested in the quality of the dealerships, all
experiences: walkin/mail order, audio/video/cellular/etc. are of
interest.

Please send e-mail to cutler@equator.com.  If anyone has the same
questions, I'd be happy to mail you a summary of the responses I get.

                                Thanks,

                                Ben Cutler
                                cutler@equator.com
Newsgroups: rec.audio
From: owen@emds.enet.dec.com (Steve Owen)
Subject: Re: Stereo Review (was Re: Very expensive cables)
Organisation: Digital Equipment Corporation, Maynard MA
Organization: Digital Equipment Corporation
Date:  9 OCT 92 13:59:06 EST


An analogy to this whole cable issue is to that of cars and tires.  I feel 
there are three types of cars and drivers:

1)	Joe Blow who has his car for transportation, even if it is a bit 
	luxurious.  If Joe was to trade the Sears tires on his car for 
	Pirrelli's (sp?), he wouldn't know the difference.

2)	Guy II drives a Porsche, but he's not an enthusiast.  He can't really 
	feel the control difference between two different types of tires.

3)	Guy III drives a Porsche and is a driving enthusiast.  He's driven 
	enough that he knows every little nuance in his car.  Mess with the 
	tires, and he feels it.

I believe cables are very much the same.  Only the music enthusiast with fairly 
high quality equipment is going to be able to tell the difference.  Others 
think he's a nut... but the others aren't an enthusiast like he is.

I was running 6 foot lenghts of radio shack cheap cheap cable from my CD player 
(Sony... not the highest model, but not the lowest) to my Adcom equipment.  
When I replaced the cable with Monster M350 (?) cable, I noticed an immediate 
improvement.  Instruments were more articulate.  There was more information.  
My fiancee thinks I'm nuts.  She couldn't figure out why I need to go from 
Fisher speakers (in my high school days) to Klipsch.  My parents thought I was 
crazy when I went from a Kenwood receiver to Adcom seperates.  Most everyone 
thinks I was crazy to spend $50 on a cable.

How about this for an experiment (for those who MUST have scientific proof)... 
Record a CD using analog connections to a DAT tape deck.  Use cheap cables for 
one test, expensive cables for another.  Are the bits the same once the DAT 
encodes them?  If not, then something is different...

********************************************* /// *****************************
Steve Owen                                   ///  Only AMIGA makes it possible!
owen@emds.enet.dec.com                   \\\///    Amiga, Unix, Mac, & IBM..
                                          \XX/      All on one machine!
*******************************************************************************
From: tomb@hplsla.hp.com (Tom Bruhns)
Newsgroups: rec.audio
Subject: Re: CD skipping comment
Date: 14 Oct 92 23:50:32 GMT
Article-I.D.: hplsla.5070319
Organization: HP Lake Stevens, WA

bill@bilver.uucp (Bill Vermillion) writes:

>It appears the discs that skip are usually the long discs, and
>the ones that don't are much shorter in length.
>
>Just a data point if anyone cares.

Another data point:  I have a player that skips more on the early
part of a disc than the later part.  It's a D9 "Discman".  It also
skips much more if it's horizontal than if it's at an angle, or
even vertical.  Works fine till you get back to horizontal
upside down.
From: bender@oobleck (Duke of Canterbury)
Newsgroups: rec.audio
Subject: Re: optical vs. coax digital interconnects
Date: 12 Oct 92 04:26:45 GMT
Reply-To: bender@oobleck.eng.sun.com
Organization: SPARK's R US
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

tlode@nyx.cs.du.edu (trygve lode) writes:
: In article <ldfelaINN459@appserv.Eng.Sun.COM> bender@oobleck.eng.sun.com writes:
: >I'm considering upgrading my audio system with a new CD player and external
: >D/A, but I'm not sure if I should get a player/converter with optical or
: >coax digital interconnects.  [...]
: 
: >Any ideas would be much appreciated, as this is a fairly substantial
: >investment for me.
: 
: Now, did you want Toslink optical, AT&T glass fiber, or a proprietary
: optical interface?  Unbalanced coax or balanced?

I'm concerned that if I choose glass fiber, it might eventually crack (as
glass does), so I think I'd prefer plastic-based fiber.  If I decide on
coax, I assume balanced coax, so that my CD player and converter won't have
problems with common-mode noise (hence, have good common-mode rejection).
When I used to work on Prime computers, they used twinax, i.e. two center
conductors wrapped in a braided shield, for their network connections.  If I
decide on balanced coax, I would rather twinax cable than two seperate coax
cables.

Thanks again for all of the advice,
mike

--
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    Grashopper, you have been many years in the training, and I grow old,
    expecting the day when I receive the SIGXCPU, and _exit this world.
    I see that you are ready.
From: andrew@alice.att.com (Andrew Hume)
Newsgroups: rec.audio
Subject: Re: Black rubber CD rings - Any good ?
Summary: the theory
Date: 14 Oct 92 16:54:51 GMT
Article-I.D.: alice.23892
Organization: AT&T Bell Laboratories, Murray Hill NJ

In article <1992Oct14.053532.18154@news.acns.nwu.edu>, andrew@casbah.acns.nwu.edu (Andrew Sung Hyun Kim) writes:
> [...]
> Can anyone tell me that by adding this ring, what improvement of error rate
> is noticed?  To my feeble understanding, as long as the 0's and 1's are read
> correctly, the sound should be identical.  SO, what you have suggested is 
> that by adding the ring, the error rate was reduced to make the improvement
> in sound.  Can anyone verify this?  Was there any test to show that by
> using the ring such reduction in error in sampling was achieved?


	this is not my area of expertise so take the following with
a grain of salt.

	the theory behind rings is not that they affect the bit stream
coming from the head, but that it affects the behaviour of the motor
drive circuitry. the reasoning goes like this:

		spinning CD is like a flywheel
		heavier flywheels require less motor support (once spun up)
		less motor use means less noise from drive circuitry
		less noise from drive circuitry means less noise in audio output


	all this is vaguely plausible but I am unconvinced of many of the
details. For example, the spin rate is always changing (normally slowly
but sometimes quickly when doing track seeks) and thus having greater
angular momentum of the disk would seem to require MORE work, not less.
And as jj and others have mentioned, sometimes the increased angular
momentum goes beyond the spec's of teh motor.

	nevertheless, the problem of noise from teh drive circuitry
polluting the audio output is a real one. Its one that real hardware
hacks know how to avoid, or at least mitigate. Undoubtably, there are
several to many CD players which, due to lack of care or money, may
exhibit such problems.

	one way to solve this problem is to do what Theta does; start with
a turntable designed for a harder problem (reading videodiscs) and work
hard on the power supply and grounding.


			andrew hume
From: uslave@mcl.ucsb.edu (Sir Prize!!!)
Newsgroups: rec.audio
Subject: Re: Adcom amp. Leave on all the time?
Date: 15 Oct 92 17:35:06 GMT

In <1992Oct14.165238.27293@ms.uky.edu> miles@ms.uky.edu (Stephen D. Grant) writes:

>I'm curious. I know that many people with tube amps leave them on
>24 hours a day. But I have recently been told that I should leave my
>solid-state Adcom GFA545 on also. Why? Is this correct?

Why people leave their tube amps on all the time is beyond me.  Those tubes
won't last very long.  Of course, if they're rich, and can afford to get new
tubes all the time, and they can't stand waiting for the amp to warm up,
then.....

I have an Adcom GFA-555, and I leave it on all the time, unless I'm going to
be away and won't listen to it for a few days.  If you can stand waiting for
the amp to warm up, and you don't want to pay the increase in your electricity
bill, go ahead and turn it off.  I can't, and electricity's free at school. :)


*        *      *     *     *    *   *  *  * * ** ** *** **** ****** *********
   Jesse Chang  (Sir Prize!!!)            INTERNET:  uslave@mcl.mcl.ucsb.edu *
   "-.-- -.-- --.." "Technology - high, on the leading edge of life."  -Rush *
*         *       *      *     *    *   *  *  * ** ** *** **** ****** ********
Newsgroups: rec.audio
From: chopin@engin.umich.edu (Gladys Lim)
Subject: Info wanted on Sony/Bose products
Date: Thu, 15 Oct 92 12:18:10 EDT
Organization: University of Michigan Engineering, Ann Arbor
Distribution: rec.audio



Hi everybody!

I'm new to this newsgroup, and I've been reading how Sony and
Bose aren't very favorable.  I would greatly appreciate it
if some of you would please send me a summary of problems/
complaints/opinions about these companies and their products.
I'm interested in knowing more, because I want to start building my audio
system, and I'd like to have some input.  I don't have anything...
no speakers, amp, tape deck, cd player..etc...  I was considering
the Bose AM5's but I'd like some opinions about these speakers.
Please e-mail me with any information/ experiences/ problems
That you might have had.   

Please send replies to glim@sedona.intel.com
                    or chopin@hfglobe.intel.com

Thanks!

-Gladys

Newsgroups: rec.audio
From: andrew@casbah.acns.nwu.edu (Andrew Sung Hyun Kim)
Subject: Re: Black rubber CD rings - Any good ?
Organization: Northwestern University, Evanston Illinois.
Date: Wed, 14 Oct 1992 05:35:32 GMT

In article <Bw3D01.Kt5@watserv1.uwaterloo.ca> bmaraldo@watserv1.uwaterloo.ca (Commander Brett Maraldo) writes:
>
>	From my experience the rings do not add enough weight to the disc to
>cause tracking or speed feedback problems.  When I use the rings at home I
>do not notice a change in sonic quality.  I do notice that the CD lens tracks
>much better.  My evidence of this is by directly observing the lens focus
>as the disc spins.  The lens moves in and out much less with a ring in place
>on the same CD.  When I use the refracting light absorber, the allsop ring
>and Finyl together I do notice a significant improvement in the sound.  I may
>be convincing myelf of this, but to my ears its there.  On my friends higher
>end system (Escoteric Audio, Krell, Martin Logan) I notice an improvement
>with each of the three methods used individually.
>
>Brett Maraldo

Can anyone tell me that by adding this ring, what improvement of error rate
is noticed?  To my feeble understanding, as long as the 0's and 1's are read
correctly, the sound should be identical.  SO, what you have suggested is 
that by adding the ring, the error rate was reduced to make the improvement
in sound.  Can anyone verify this?  Was there any test to show that by
using the ring such reduction in error in sampling was achieved?

Andrew Sung Hyun Kim                                Office  (708)-491-5294
1849 Asbury Ave.  Evanston IL. 60201                Home    (708)-570-0584  
andrew@eecs.nwu.edu  andrew@casbah.acns.nwu.edu  Rats E.sir       


Newsgroups: rec.audio
From: byrns-j@gamma.corp.mot.com (John Byrns)
Subject: Estimating Speaker Efficiency
Organization: Motorola
Date: Wed, 7 Oct 1992 18:46:43 GMT


Can any of the speaker experts out there tell me if it is possible
to estimate the efficiency of a direct radiator speaker without
actually measuring it directly. Can it be derived in any way using
only the equipment you would use to measure the Thiele-Small parameters?
Could you calculate it from the Thiele-Small parameters and an estimate
of the piston area?