HDTenEightyP/NetNews huggingface dataset:
From: deanaj@elec.canterbury.ac.nz (A. J. Dean)
Newsgroups: rec.audio.high-end
Subject: Re: Laser Illusions Spatial Filter
Date: 14 Dec 1992 04:41:48 +0000 (GMT)
Organization: Electrical Engineering, University of Canterbury, New Zealand
 <01GSBBUODUM8ANBIWX@csc.canterbury.ac.nz>; Mon, 14 Dec 1992 17:41:56 +1300
 14 Dec 92 17:41:53 NZD
NNTP-Posting-Host: 129.89.7.4
Content-Transfer-Encoding: 7BIT
Originator: tjk@csd4.csd.uwm.edu

"Kevin Sutton" (SUTTONK@lan.lincoln.cri.nz) wrote:
: Kevin Sutton (suttonk@lan.lincoln.cri.nz) writes:
: 
: Has anyone tried the Laser Illusions 'Spatial Filter', a
: supposedly jitter-reducing lens which fits over the CD laser
: lens?  I would be interested to know how these devices are
: supposed to work, how much they cost and where I can get one from
: (they are not in the shops here).

I have absolutely no idea what they are, but it sounds like it is something
which filters out (ie blacks out) crosstalk from adjacent tracks on a CD -
this would help remove noise from the readout signal which becomes jitter
once it is bit-sliced (ie read in as binary). Maybe this jitter could get
into the output of the transport or the audio somehow.

This "spatial filter" could use an optical structure similar to a
diffraction grating to do the filtering, perhaps aiding in the cancellation
of unwanted parts of the reflected beam - I'm sure someone could think of
something - perhaps using a holographically created filter. 

And of course you must keep in mind that it could simply be a piece of
plastic which does nothing apart from cost. Hey, I've just noticed that you
are pretty much local! That could explain it - there have been a few
rip-offs for sale lately but assuming it isn't being pushed by one of our
local rip off merchants it sounds a bit more promising... 

Antony. (deanaj@elec.canterbury.ac.nz
From: paul@gaitlab1.uwaterloo.ca (paul j guy)
Newsgroups: rec.audio.high-end
Subject: Re: Laser Illusions Spatial Filter
Date: Sat, 12 Dec 1992 00:12:06 GMT
Organization: University of Waterloo, Waterloo, Ontario, Canada
NNTP-Posting-Host: 129.89.7.4
Keywords: spatial,filter,laser
Originator: tjk@csd4.csd.uwm.edu

In article <1g7j11INN1fn@uwm.edu> "Kevin Sutton" <SUTTONK@lan.lincoln.cri.nz> writes:
>Kevin Sutton (suttonk@lan.lincoln.cri.nz) writes:
>
>Has anyone tried the Laser Illusions 'Spatial Filter', a
>supposedly jitter-reducing lens which fits over the CD laser
>lens?  I would be interested to know how these devices are
>supposed to work, how much they cost and where I can get one from
>(they are not in the shops here).
>
>Can anyone help??????
>
  Their address is Laser Illusions Inc.
                   1220F west ogden aveenue
                   Naperville, IL 60563
                   phone or fax:708 717-5300

  and the people actually selling their product are:
                   Select Sounds Audio Video
                   1220 West Ogden Ave.
                   Naperville IL 60563
                   phone 708 717-1100, fax 708 717-1804
 
   So far I am not a happy customer. I ordered one of these things
for my NAD5100 back in August. They shipped me one in mid-september.
It was the wrong size, I faxed both companies, and received an additional
one about a month later. It was a different size, but still not the
correct size. I returned both about a month ago, and haven't heard
a word since. It cost me about $86 (I'm from Canada).
   It's a tiny little aluminum disk, that fits over the laser head,
with a .060 inch hole in the center. That's it!
   I was going to try some of the little do-nut thingies you use
for laying out pc-boards, but they have an adhesive backing (not
good if you have to yank them off the laser head). Tiny washers might do,
but if they fall into the guts...... bye bye cd player.
   I have the feeling that they have a cross-reference to various
cd players that's not in very good shape, which might explain the
wrong sizes they sent me. Either that or this their first commercial
venture, and they're just a bit out of the picture.
   Since then, I've tweaked the daylights out of both my cd player and
power amp, so I'm reasonably satisfied with my system......for a while!

-Paul


-- 
-----------------------------------------------------------------------------
Paul J Guy			work phone:519-885-1211 ext 6371  
paul@gaitlab1.uwaterloo.ca	home:519-744-5016   FAX:519-576-3090
pguy@healthy.uwaterloo.ca	..remember...bullshit baffles brains...
From: shearson!dcohn@uunet.UU.NET (Daniel Cohn)
Newsgroups: rec.audio.high-end
Subject: Re: Amplifier specifications
Date: Tue, 15 Dec 1992 22:06:42 GMT
Organization: Lehman Brothers, Inc.
Reply-To: shearson!dcohn@uunet.UU.NET
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

Yes there are several but Walt Junk in the Audio Op Amp Cookbook is a 
clear discussion also see his series in the Audio Amateur
From: markt@cup.hp.com (Mark Thompson)
Newsgroups: rec.audio.high-end
Subject: Re: Toroidal transformers available for tube amps.
Date: Thu, 17 Dec 1992 17:19:06 GMT
Organization: Hewlett-Packard
NNTP-Posting-Host: 129.89.7.4
Originator: tjk@csd4.csd.uwm.edu

They also provide kits for winding your own transformers if either of thoes
don't work for you.  I bought one and winding was not as hard as it might
seem.

Mark
From: bmyers@well.sf.ca.us (Bryan L. Myers)
Newsgroups: rec.audio.high-end
Subject: Sony's Mini-Disc
Date: Tue, 15 Dec 1992 23:18:11 GMT
Organization: Whole Earth 'Lectronic Link
NNTP-Posting-Host: 129.89.7.4
Summary: What I know about the MD.
Originator: tjk@csd4.csd.uwm.edu


I've been watching the mini-disk lit closely as I'm considering
purchasing one for home recording purposes.  Cambridge Soundworks
is selling them right now.  Playback unit = $500; record unit =
$700; car playback unit = $1000; blank disks = $12. Sound is
supposed to be equivalent to DCC or intermediate between CD and
analog tape.  The impressives are 5 sec buffer which corrects for
skipping; random access unlike DAT; write many read many times.
1000 pre-recorded titles to be released next month (only SONY
who own everything can pull this off !).  The disk looks like a
MAC disks but is smaller (2" square).  All this sounds good BUT
I haven't heard one to see if it SOUNDS good, ya know ?  In the
December issue of *phile there is a much more detailed review.
Sincerely, TeknoThor (bmyers@well.sf.ca.us) 12.15.92

Newsgroups: rec.audio
From: law40001@nusunix1.nus.sg (CHENG KWONG WING)
Subject: Re: How to tape a 1hr long pgm on an analogue tape deck...
Organization: National University of Singapore
X-Newsreader: TIN [version 1.1 PL6]
Date: Thu, 17 Dec 1992 01:07:13 GMT

Hi George,

I'm not too sure how you're going to solve your problems, but IMHO I
myself will not use a tape which is of more than 60 mins capacity.

Tapes of more than that length usually have problems of getting stuck
eventually in the long run.  I would welcome anyone's comments about
this though.

Regards,
Kwong Wing

--
--
____________________   .    .   __         . 
\______NCC_1701_____|) .____.--"--"---._____ 
             ||      /-----._________.----/  
     /=======||====/___/       "--"          
   . \==\____________|(-                .   
Newsgroups: rec.audio
From: bmaraldo@watserv1.uwaterloo.ca (Commander Brett Maraldo)
Subject: Re: I just tested DCC and MD...
Organization: Unit 36 Research, UofWaterloo
Date: Sat, 12 Dec 1992 05:39:41 GMT

	Ok.  i have some questions about these DCC and MD things.  Does MD
use a similar frequency domain compression algorithm or some other
unusual compression scheme?  Are the MD media enclosed in a cartridge or
bare like CDs?
	On a grander topic, this is how I see it and I would like to hear
some comments about this:  In the world of consumer audio media, we currently
have CD and analogue cassetee (and vinyl, to some degree).  DCC and MD are
being introduced into this category.  I can not see all four taking footholds.
CDs are a good thing, compared to DCC and MD, as far as I am concerned.  I am
not interested in a format that requires the signal to be degraded more than
straight ADC-DAC conversion.  That rules out DCC.  So, if MD takes over it is
hard for me to imagine both CD and MD existing.  I am afraid that MD will
take over CD.  Then we will be stuck (presuming that MD does some PASC like
compression).  I like CD, I like analgoue cassette, I like DAT and vinyl.
Do we really need a new media?  Perhaps this is just a ploy for the industry
to gain more revenue (control) over the consumer.  Think about it... aren't
CDs fine with you?  Do you really have a problem with cassettes?  Want digital
recording?  Buy DAT.  Why go for lower quality?

brett maraldo
plexus productions

ps.  Incedentally, DAT prices (for media and machines) are cheaper than for
DCC and MD.  If more people buy DAT the prices will be driven lower and there
will be more motivation to introduce prerecorded DATs.  

 

-- 
               --------     Unit 36 Research     ---------
	                "Alien Technology Today"
  	 	      bmaraldo@watserv1.UWaterloo.ca
  	           {uunet!clyde!utai}!watserv1!bmaraldo
Newsgroups: rec.audio
From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
Subject: Re: FORSAIL:Nakamichi Electronic Crossover
Organization: Skidmore College, Saratoga Springs NY
Date: Fri, 18 Dec 1992 23:22:39 GMT

schludermann@sscvx1.ssc.gov writes:
> Nakamichi electronic crossover & power supply, EC-100 & PS-100. $200. Have
> original packaging.

WOW!  I didn't even realize that they would float!
-- 
---------------------------------------------------------------
\ 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
From: rouben@math9.math.umbc.edu (Rouben Rostamian)
Subject: Recommendations sought on FM antennas (antennae?)
Originator: rouben@math9.math.umbc.edu
Organization: Department of Mathematics
Date: Sun, 20 Dec 1992 16:50:00 GMT


Washington DC has some really cool FM radio stations.  Unfortunately
I live 35 miles away from DC and the signals I receive are rather weak.
For both of my receivers (Akai and Nikko) I use the usual indoor dipole
antennas supplied by the manufacturers.  The local housing regulations
disallow installation of external radio antennas.

I have considered buying one of those small, amplified FM antennas sold
in audio stores (brand names: Trek, Parsec, Recoton.)  I have a feeling
that these gadgets are long on gimmick and short on performance, but I
am not sure.  I would like to hear your experience with various FM
indoor antennas, and in general, recommendations to improve my
reception of remote signals.

--
Rouben Rostamian
Newsgroups: rec.audio
From: swh54716@uxa.cso.uiuc.edu (Scott W. Henson)
Subject: CD Changers
Summary: Advice sought on CD Changers...
Organization: University of Illinois at Urbana
Date: Fri, 18 Dec 1992 00:22:52 GMT
Keywords: CD Changers

Anyone like to contribute some suggestions concerning CD changers?  Which
one(s) do you like best (and why)?

Which disk handling system is preferable (carousel, magazine)?

Any comments and advice will be much appreciated.

-- 
----------------------------------------------------------------------------
-  Scott W. Henson                        Internet: scott-henson@uiuc.edu  -
-  Network Administrator                     Voice: 3-6104 (leave msg)     -
-  International Studies Building                                          -
From: dplatt@ntg.com (Dave Platt)
Newsgroups: rec.audio
Subject: Re: Do I really need 200W?
Date: 17 Dec 92 03:01:08 GMT
Organization: New Technologies Group, Inc.  Palo Alto CA

>The RMS term is the slightly less bogus one but it's meanless without the
>accompanying test conditions that the RMS figure was arrived at.
>
>Eg Take an RMS measurement very quickly (<0.5 sec) before the power supply
>starts to sag and claim that.
>
>'Continuous RMS' is a better figure.

This was the line of reasoning that the Federal Trade Commission (I
think it was) here in the U.S. followed, when they laid down standards
for amplifier testing 15 years or so ago.  In order to advertise an
amplifier as (e.g.) "200 watts", the amp must be capable of sustaining
that power level for some time (several minutes, I believe) _after_ a
warmup period of at least 30 (?) minutes at one-third of the advertised
power.  The one-third-rated-power level is a particularly difficult one
for amplifiers, as it's near the point at which a Class AB audio
amplifier is dissipating the most heat in its output stage.  All in all,
the testing rules give amps a pretty fair workout.

I believe it's technically a violation of the rules to advertise an amp
as having "N watts", and not state what RMS power the amp is capable of
delivering under these standard test conditions.


-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2470 Embarcardero Way, Palo Alto CA 94303
From: tranhun1@elof.iit.edu (Hung Q. Tran)
Subject: ARE 100-110 MINUTE TAPES BAD?
Organization: Illinois Institute of Technology, Chicago
Date: Sun, 20 Dec 92 00:15:58 GMT


I always see the 100-110 minute tapes usually cheaper than the 90 
minute tapes.   Are they necessarily delicate?  What difference
is there between the quality of a 90 min tape and a 100 min tape.

thanks

tran
From: gnu@hoptoad.uucp (John Gilmore)
Newsgroups: rec.audio
Subject: Re: Sony's Mini-Disc -- personal review
Date: 17 Dec 92 13:47:03 GMT
Organization: Cygnus Support, Palo Alto

I posted a review of the Mini-Disc after owning one for about two
weeks, in rec.audio.high-end.  *Then* I discovered the discussion down
here in rec.audio.  If you go to the parent of this article
(<30051@hoptoad.uucp>), you'll find the review.  My apologies for
putting it outside the main focus of discussion.
-- 
John Gilmore                gnu@toad.com  --  gnu@cygnus.com  --  gnu@eff.org
				RESTRICTED
    Notice. - This document contains information affecting the national
    defense of the United States within the meaning of the Espionage Act
    (U.S.C. 50: 31, 32).  The transmission of this document or the
    revelation of its contents in any manner to any unauthorized person
    is prohibited.
From: scott@psy.uwa.oz.au (Scott Fisher)
Newsgroups: rec.audio
Subject: Re: CD players revisited - Luxman vs. Marantz
Date: 16 Dec 1992 02:18:53 GMT
Organization: The University of Western Australia
NNTP-Posting-Host: wapsy.psy.uwa.oz.au

>Hello netters,

>I have noticed that when it comes to CD players (<$400) 
>very few people seem to mention Luxman DZ121. Is it just
>a coincidence or are there so many better cd-players in this
>range? The reason I'm asking is because a local store is now 
>offering it for $300, and I figured it might be a good deal
>(it's not a display or used model). 

For some reason (like Luxman is not that widespread in the US) Luxman
rately rates a mention in this group at all.  That said Luxman make a
fine range of equipment, that depending on the countary you live in
can compete with the best of them in value-for-dollar terms.  All Luxman
gear I have seen (quite a lot) has been well made and sounded as good
as anybody else.  Here in Australia I think Rotel is better value for
money...sounds just as good and is cheaper (on average).  Luxman does
seem to be very well made. 

Regards Scott.
_______________________________________________________________________________
Scott Fisher [scott@psy.uwa.oz.au]  PH: Aus [61] Perth (09) Local (380 3272).                
                                                             _--_|\       N
Department of Psychology                                    /      \    W + E
University of Western Australia.      Perth [32S, 116E]-->  *_.--._/      S
Nedlands, 6009.  PERTH, W.A.                                      v       

Joy is a Jaguar XJ6 with a flat battery, a blown oil seal and an unsympathetic 
wife, 9km outside of a small remote town, 3:15am on a cold wet winters morning.
-------------------------------------------------------------------------------
Organization: Penn State University
Date: Wed, 16 Dec 1992 20:45:22 EST
From: <LLH111@psuvm.psu.edu>
Newsgroups: rec.audio
Subject: Dennon carousel changers + others

I just bought an DCM-520 Dennon carousel changer a few weeks back.
This player is their top of the line carousel (I got it for around $400).
It sounds okay.  My own impression of the mechanical construction is that
iit should be built better as it is top-of-the line.  For example, I looked
inside, and the structure does not look very precisely aligned (e-mail me
for more specific info at my other acct.--see end of this post).  Also,
the player skips when the drawer goes in, and the drawer is 'wiggely'.
Would someone please recommend a more solidly built 5-disc player which
can change 4 while playing one?  I've looked at the adcom, and it does
look more solid on the outside, sounds very good.  What about phillips,
yamaha?  Anyone own the adcom changer?  Own a Yamaha or Phillips changer?
Tell me all about it!  Thanks.
.
Posted for Richard...please send replies to RMD@psuarch.psuvm.psu.edu
From: amc@wucs1.wustl.edu (Adam Costello)
Newsgroups: rec.audio
Subject: Re: MiniDisc is here!
Date: 17 Dec 92 21:56:59 GMT
Organization: Washington University, St. Louis MO

In article <1992Dec16.051902.23597@nmt.edu> drkhoe@nmt.edu (ONID) writes:
>
>Just to clear up some misconceptions:
>
>DCC uses a hash table, just like a disc, to delete a song and replace it, you
>don't have to redo the whole tape..

A hash table?  I know what a hash table is, but I wasn't aware that
they were used in CDs or MDs (which did you mean by "disc"?).  If
you know any details, I bet many people would be interested.  Please
post them.

Thanks,
AMC
From: jhenders@jonh.wimsey.bc.ca (John Henders)
Newsgroups: rec.audio
Distribution: world
Organization:  One of these days for sure
X-News: HERMES MMAIL 1.10 Rev. Nov 25 1992
Subject: Re: Mr. Pierce responds to Re: Class C amplifiers, says Mr. Pierce.
Date: Sat, 19 Dec 1992 16:18:00 -0800
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

In <BzGnyo.DqL@world.std.com> DPierce@world.std.com (Richard D Pierce)
				writes:

>Can anyone confirm my memory that this generation of Phase Linear was Bob
>Carver's handywork?

	Certainly can. ;-) Bob was living around Seattle at the time, and a
local (Vancouver, BC) PA company probably gave him enough business to
keep him going and more. They are still selling off Phase Linears as I
write this, though they're probaby down to 10 or so. Only last year did
they remove the Phase Linears from their concert monitor system. All
their amlifiers had been modified by their resident tech years ago,
though I'm not sure if his modifications addressed the problem you're
talking about, as another unmentioned problem with them was a disturbing
habit of taking speaker drivers with them when they died. They certainly
were an interesting use for a transistor originally designed as a speed
controller for golf cart motors though.


-- 

 "If Rush fans were braindead, why are there so   Bruce Bufalini
 many people posting to alt.music.rush?"              PSU
Newsgroups: rec.audio
From: ledzep@cbnewsh.cb.att.com (carl.w.muhlhausen)
Subject: Re: Planars and stuff...
Organization: AT&T
Date: Fri, 18 Dec 1992 12:55:38 GMT

In article <sikorsky.724636866@ee.ualberta.ca> sikorsky@ee.ualberta.ca (Mike Sikorsky) writes:
>How easy everything would be if *everyone* agreed on the best speaker
>design...
>
>My reasoning behind getting planars is this:
>
>I cannot afford really exotic cone/box designs that WILL do justice to how
>music should be played (B&W 801, Thiels, Mirage, etc...), so it seems to me
>that I should go for a design that almost does this.  Well knowing the 'lack'
>of low bass from planars, I readily accept that the rest of the audio
>spectrum that they do reproduce readily can outperform even the most costly
>box designs.  Why, then, would/should I pay countless dollars just to
>reproduce a range of music (15-45 Hz) that is generally absent from most
>recordings?
>
>It makes sense to sink most of your money into what you hear most of the
>time; spending extra to get the deep bass and comprimising on everything
>else is foolish.  Of course, if one can afford the ultimate in box
>designs, then hey, this is moot.
>
>Why, then, are most people concerned with quantity of bass, rather than
>the quality of it?  (sounds familiar...8-) )
>
Well different strokes... I for one can't understand how one can get
excited by a speaker that doesn't reproduce low bass. And I do
mean faithfully reproduce it. Not your exaggerated 100 Hz bump stuff.

Carl

Carl Muhlhausen		"Kum wit me iff you vant to liff"
att!taz!ledzep
From: jmoyer@adobe.com (John Moyer)
Newsgroups: rec.audio
Subject: For Sale: Velodyne ULD-12 12" subwoofer
Date: 17 Dec 92 18:36:55 GMT
Distribution: ca
Organization: Adobe Systems Incorporated

Velodyne ULD-12 12" subwoofer with integrated 100w amp, $800

Frequency Response: 20 - 85 Hz
Power             : 100 watts RMS, 400 watts peak
Size              : 22.5"L x 17"W x 18.25"H
Weight            : 49 lbs
Finish            : Walnut Veneer 
List Price        : $1295!

The ULD-12 consists of two pieces, a controller/crossover and an integrated
subwoofer/amplifier.

The crossover/controller is a small unit that sits next to your other 
components, and has controls for subwoofer in/out, power-on indicator, and 
level.  The level control is set once to adjust the subwoofer output 
relative to the other speakers. The controller/crossover can be connected 
to a system in several ways:
1. Between preamp and main power amp using the line-level inputs.
2. Between main power amp and main speakers using the speaker-level inputs.
3. To a subwoofer out using a single line-level input.
If connected as in #1, the main power amp and main speakers will not be called
upon to handle any signals below 85 Hz, which can markedly improve system
performance.

The subwoofer/amplifier is connected to the controller with a 5 meter cable, 
and can be placed just about anywhere.  The 12" downward-firing driver is big
enough to move some air, while the cabinet size is small enough to be
reasonably unobtrusive. An accelerometer on the driver measures cone motion and
provides feedback to the amplifier to limit distortion to less than 0.5%.  The
amplifier cannot be overdriven and will self-limit automatically to prevent
clipping or damage.

For more information on Velodyne subs, as well as some subjective opinions on 
their performance relative to similar units from Infinity, Hsu, and Altec,
see the "Subwoofer Shootout" article in the November, 1992 issue of 'Audio'
magazine.

--------------------------------------------------------------------------------
John Moyer          Adobe Systems, Mtn. View, CA          jmoyer@mv.us.adobe.com
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: rec.audio
Subject: Re: Advice with Magnepan Planars
Date: 11 Dec 92 16:45:01 GMT
Article-I.D.: bit.526
Reply-To: grego@bit.UUCP (Grego Sanguinetti)
Organization: BIT  Portland, OR

In article <sikorsky.723929231@ee.ualberta.ca> sikorsky@ee.ualberta.ca (Mike Sikorsky) writes:
>I'm basically in the SMGa to MG2.6R range only, as far as models go.
>I'm worried about the Magnepans and their ability to handle high power;
>I'd hate to burn them up!  Should I be concerned?

I have found the SMGa's to be quite reliable. I have a pair driven by an Adcom
535 (very conservately rated at 60w/chan) that get a regular dose of rock and
very dynamic video sound tracks. I can't comment on the 2.6R's.

The SMGa's are a good buy. They are also a good long term investment since
they make GREAT surround speakers for a Pro-logic video set up, especially
when combined with big Maggies up front.

-grego
-- 
---------------------------------------------------------------------------
Grego Sanguinetti, Bipolar Integrated Technology | Water, water everywhere,
grego@bit.uucp or grego%bit%ogi.cse.edu          | but I'd rather drink
or bit!grego@ogi.cse.edu or ...!ogicse!bit!grego | beer.
Newsgroups: rec.audio