HDTenEightyP/NetNews huggingface dataset:
From: rkarlqu@scd.hp.com (Richard Karlquist)
Newsgroups: rec.audio
Subject: Re: DIY Cutting holes for woofers
Date: 10 Nov 1992 04:08:07 GMT
Organization: Hewlett Packard Santa Clara Division
NNTP-Posting-Host: hpscrj.scd.hp.com
X-Newsreader: TIN [version 1.1.4 PL6]

I recently acquired a "Scroll saw" which is a sabre
saw with the blade in a freely rotating holder.  If
you use it to cut a circle, are you supposed to set
the controls to "float" the blade or lock it in the 
straight ahead position.  I didn't have much luck
with it; the blade kept bending to the side.  Anyone
know what the right technique is?  (I used a pivot
jig that came with the scroll saw to get a "perfect"
circle, but it worked better hand guided following
a pencilled-in circle by eye).


--
       -------------------------------------------------
       |  Rick Karlquist                               |
       |  Hewlett-Packard Santa Clara Division         |
       |  Precision Time and Frequency R&D             |
       |                                               |
       |  email:  rkarlqu@scd.hp.com                   |
       |  landline:  (408)-553-2194                    |
       |  radio:  N6RK                                 |
       ------------------------------------------------
Newsgroups: rec.audio
Subject: Integrated Tuner(s)
From: michael@sunbeam.ksc.nasa.gov (Michael D. Myjak x7-3286)
Date: 11 Nov 92 09:19:37
Distribution: world
Organization: NASA, Kennedy Space Center, FL.


	Does anyone know of a product that incorporates a 181 channel
cable TV tuner with an FM tuner? 

--
- Michael D. Myjak			
  Senior Technical Specialist, Systems Analyst
  McDonnell Douglas Space Systems Company
  Kennedy Space Center, Fl., 32815
  MYJAK@TITAN.KSC.NASA.GOV

Gravity. It's not just a good idea. Its the LAW!
Newsgroups: rec.audio
From: loj@cae.wisc.edu (Lo Jeffrey)
Subject: Re: Low Price DAC
Organization: U of Wisconsin-Madison College of Engineering
Date: 10 Nov 92 11:13:07 CST

In article <1992Nov10.094830.2078@leland.Stanford.EDU> kong@leland.Stanford.EDU (Kong Kritayakirana) writes:
>
>Another thing that might make "CD playback system" sounds different is
>jitter. But this is entirely up to the accuracy of the clock signal that's
>feeding into DACs. So by the reasons above, my concern about Transport sounding
>"different" is put to rest until some real evidence exists to the contrary.
>

This is nit-picking, I know, but the accuracy of the clock signal can be
corrupted by bad cables, noise, etc.

>CAL Sigma D/A                Tubes??? Are they reliable? More expensive than
>			     the DDE v2.0 and the cosmetics isn't attractive

I have never opened up a CAL Sigma myself, but I have heard that it uses
the Crystal Semiconductor CS4328 D/A chip which has *line level outputs*
on it, instead of the traditional current output which goes to an op-amp.
This means that the tube output stage is nothing more than a unity gain
op-amp which does nothing more than chew up the sound with more analog
circuitry.  It looks good in an advertisement, though.

Jeff Lo
loj@cae.wisc.edu
From: nwsedlak@csugrad.cs.vt.edu (Neil Sedlak)
Newsgroups: rec.audio
Subject: JVC Reciever For Sale
Date: 8 Nov 92 05:45:44 GMT
Organization: Virginia Tech Computer Science Dept, Blacksburg, VA

Reciever For Sale: 

	JVC RX-505VTN
        -------------

	80 Watts RMS per channel in front   (2 channels)
	20 Watts RMS per channel in surround rear (2 Channels)
	Inputs: VCR, Video, Phono, CD, Tape1, Tape2/Monitor
        S.E.A. Graphic Equalizer
	Dolby Surround-Sound
	Remote


	Only $200

Leave Mail to nwsedlak@csugrad.cs.vt.edu or call (703)232-3658
From: bobbyr@csugrad.cs.vt.edu (Bobby Richardson)
Newsgroups: rec.audio
Subject: Newest DAT from Japan
Date: 12 Nov 92 05:55:36 GMT
Organization: Virginia Tech Computer Science Dept, Blacksburg, VA

Does anybody know the lastest DAT players available in Japan as 
the date of NOV. 13, 1992? While I was in Japan this summer I have seen
Sony DAT 3000ES, 1500ES, and 750ES at Namba area in Osaka city. 
Besides these models I wonder other better DAT players are available.
If possible, do you know the prices of them(don't matter in Yen or US $).
Thanks.
Newsgroups: rec.audio
From: hillman@iastate.edu (Matthew C Hilleman)
Subject: WANTED: Effects Processor -- ANY brand
Organization: Iowa State University, Ames IA
Date: Fri, 6 Nov 1992 02:20:18 GMT

	I am looking for an Effect processor that will do:
		Compression
		Reverb
		Delay
		Par. EQ, etc...

	I am willing to trade a MIDI KITI. It converts your drum triggers
	into a MIDI signal for a sound module. Has never been used on the
	road. Actually, it hasn't been used more than 8 hours. works great.


later


-- 
*	Matt Hilleman		hillman@iastate.edu			*
*	(515) 232-5976							*
*	2611 Luther Dr. #137	"Gimme a Coke and Taco. TO GO!!"	*
*	Ames, IA 50010							*
From: "herb chong" <herb.chong@channel1.com>
Newsgroups: rec.audio
Subject: double blind testing
Date: 10 Nov 92 14:53:07 EST
Reply-To: "herb chong" <herb.chong@channel1.com>
Distribution: rec
Organization: Channel 1 Communications

BK>If I have this right, a double blind test is where both the tester and
BK>the testee are deprived of knowing something about the items being tes
BK>that could cause either of them to conciously or unconciously let any
BK>personal bias skew the results of the test.

yes.

Herb...

---
  WinQwk 2.0 a#314  And God said: E = mv - Ze/r, and there was light!
--
Channel 1 (R)   Cambridge, MA

Newsgroups: rec.audio
From: ianchan@leland.Stanford.EDU (Ian Hin Yun Chan)
Subject: For Sale
Summary: Arcam Delta60 amp
Keywords: amp, sale, CHEAP!
Organization: DSG, Stanford University, CA 94305, USA
Date: Fri, 6 Nov 92 06:46:08 GMT

I'm selling my 3-yr old Arcam Delta60 amplifier. It's a British-designed
minimalist amp with good MM/MC phono stages (for those who need them). It's
basically a power amp with a volume control, so it has little electronics
in the pathway which directly results in better sonic performance.
Power output is 55Wpc into 8ohms, frequency response 30 - 35,000Hz +/- 0.5dB,
and max. current delivery is 10amps. It has NO tone controls, NO loudness
switch, NO muting switch (minimalist as I said), but has a headphone socket
and two speaker outputs (one fixed and one swiched). Note, though, it has one
quirk - the speaker outputs are banana plugs only. They believe, I guess,
those are superior terminations.
Going for $450, including shipping and an 8ft pair of Audiolab Superflex
speaker cable (silver-plated stuff). O.b.o. as usual.
Please mail me at ianchan@leland.stanford.edu if interested.

- Ian
From: yip@hpfcso.FC.HP.COM (Tom Yip)
Date: Wed, 11 Nov 1992 00:04:54 GMT
Subject: Portable CD Problem
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.audio

I bought a Sony Portable CD player (DT-66) about a month ago.  Yesterday,
I discovered that the plastic spindle hub on which the CD rests is
split down the middle.  Furthermore, some of the "spokes" on the hub
are cracked, and in fact some came out.  The player has *NOT* been abused
(i.e., dropped) and I have not been jamming CDs on the hub.  The player
has been treated normally, if not better than average.  Fortunately, I
can get it fixed under warranty.

However, I am disappointed that such a part is not designed to be more
robust.  Did the hub get molded from a bad batch of plastic?  Has anyone
else had this problem?  Is this a defect in the Sony line or is it a defect
of portable CD players in general?

Any comments would be greatly appreciated.


Tom Yip (yip@fc.hp.com)

Newsgroups: rec.audio
From: hunter@work.nlm.nih.gov (Larry Hunter)
Subject: Re: Integrated Tuner(s)
Organization: National Library of Medicine
Date: 11 Nov 92 12:28:45


Michael Myjack asks:

   Does anyone know of a product that incorporates a 181 channel cable TV tuner
   with an FM tuner?

Well, there is the Kenwood RZ-1 which is basically an attempt at a DC->Light,
all mode tuner.  It is at least 60kHz to 900MHz (maybe higher?) with no gaps,
and has AM/FM/FM Stereo/Video output (no SSB).   Mediocre sensitivity, but
should be fine for commercial FM and cable TV.  I haven't tried one, but I have
thought about it.

		Larry

--
Lawrence Hunter, PhD.
National Library of Medicine
Bldg. 38A, MS-54
Bethesda. MD 20894 USA
tel: +1 (301) 496-9300
fax: +1 (301) 496-0673 
internet: hunter@nlm.nih.gov
encryption: PGP 2.0 public key via "finger hunter@work.nlm.nih.gov"
Newsgroups: rec.audio
From: DPierce@world.std.com (Richard d Pierce)
Subject: Re: PNP vs NPN Output Stages
Keywords: Lock
Organization: The World Public Access UNIX, Brookline, MA
Date: Mon, 9 Nov 1992 14:50:07 GMT

In article <1992Nov9.113458.16272@EE.Surrey.Ac.UK> R.Bish@EA.surrey.co.uk (Rob Bish) writes:

>Here at ExtrAudio we have recently been studying the comparative merits of
>PNP vs NPN transistor audio output stages. The results are indeed
>interesting. PNP transistors were found to have preferable characteristics
>owing to their warmer more precise sound which listeners believed created
>a sound reproduction environment more suited to the rendition of
>quintessentially romantic lyricism, but NPN transistors were more at one
>with the idiom of Baroque counterpoint. 
>
>***** if you like Bach use NPN *****
>***** if you like Chopin use PNP ***
>
>We are currently working on an output design that allows the audiophile to
>switch between NPN and PNP output stages depending upon taste and source
>material, with a hybrid NPN/PNP transistor for those who like Elgar. 
>
>We believe this effect owes to the higher speed of electrons through an
>N-type junction being relativistically effected (by the uncertainty
>principle) leading to noise and distortion, particularly noticeable at low
>frequencies. 
>
>Has anyone else observed this effect, and can they shed any light on the
>cause? 

PLEASE, GOD, LET THERE BE A SMILEY FACE SOMEWHERE IN THIS POSTING!

-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: rec.audio
Subject: Re: Pro Logic Center channel speakers
Keywords: pro logic
Date: 5 Nov 92 20:13:19 GMT
Article-I.D.: bit.464
Reply-To: grego@bit.UUCP (Grego Sanguinetti)
Organization: BIT  Portland, OR

In article <5495@gold.gvg.tek.com> chrisc@gold.gvg.tek.com (Chris Christensen) writes:
> <in response to center channel speaker inquirey>
>I have posted, at length, on the center channel speaker issue.  I
>won't get into detail now but I will spout my personal observation....
>
And I usually counter with an alternate viewpoint, also at length....
(All do respects to Chris, who's opinions I respect)

>If your atempt is to reproduce the theater sound system in the home,
>then you must use a full size speaker that is identical to the
>left and right speakers.
>
The only thing you "must" do is enjoy yourself! I spent the bucks for a
full blown Pro-log system several years ago for one purpose:
to get the maximum excitement out of my video system.

I have tried a number of different speaker combinations and found that
electrostatic and planar speakers produced the most exciting effects. However
they didn't work well for the center channel. For one thing they are too
big. The other problem is imaging. In my opinion, the center channel should
be a point source. It should be quite obvious that the sound is comming
from the middle of the screen.

With this in mind I chose to use two small (8") speakers on each side of
the monitor, run in mono (of course). They are old Altecs and have a nice
warm sound especially suited for voice. They also work well for explosions!

I do agree that the center speaker and the L-R mains should work well
together. It is important that sounds that move from the center to one
side transition smoothly. I worked that with trial and error and a touch
of EQ.

>To correctly and accurately reproduce dialog the bandwith of the
>center channel speaker should be flat (not -6 dB down) for the
>bandwith of 100Hz to 10 kHz.
>
Yes, as I remember from the liturature the center channel is rolled off
below 100Hz. That's still pretty low though. You need good bass response
to make Lurch sound good B^)

>The theater systems that you are trying to duplicate in the home are a
>minimum of three full size speaker systems in the front and array of
>speakers for the rear.
>
I also don't agree with the wall of sound behind the listener, but I'll
save that for a different post.

>I don't want to hear flames about architectural problems relating to a
>full size center channel speaker,   that's what you should spend you
>time solving....
>-- 
Yeah right Chris no problem, Martin-Logan talks about how their speakers
are transparent right?

-grego (uh, Grego, say, the sound is great but we can't see the TV!?)
-- 
---------------------------------------------------------------------------
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
From: stud1b53@bnr.ca (Anshu Prasad)
Subject: Re: Audio cables ...
Reply-To: stud1b53@bnr.ca
Organization: Bell-Northern Research Ltd.
Date: Fri, 06 Nov 92 14:06:19 GMT

In article <gilchr.721041722@ee.ualberta.ca>, gilchr@ee.ualberta.ca (Andrew Gilchrist) writes:
|> 
|> [Junk about how good speaker wires can make all the difference in the
    ^^^^
|>  world deleted]
|>

  Junk?!?  IMHO, speaker wire and interconnects _can_ make a considerable
difference.  I have heard it.  I did not believe it UNTIL I heard it for
myself.  Just because you are unable to hear the difference, or perhaps
have not even tried, does not make the entire notion "junk".  If you
haven't done any blind A/B tests with interconnects and speaker wire,
open up your mind and give it a try.  That's all I ask.  You might be
surprised.  And if you still don't hear a difference, don't imply that
others shouldn't either.
  Diverting power to flame shields...

|> 
|> Andrew

-- 
   __ ___  
  /\ \ \ \  Anshu Prasad                        stud1b53@bnr.ca
 /--\ \/_/  Ottawa, Ontario, CANADA
/_/  \_\    All opinions are my own, not my employer's, BNR Ltd

Newsgroups: rec.audio
From: wakeland@silver.ucs.indiana.edu (ray s wakeland)
Subject: DIY Cutting holes for woofers
Organization: Indiana University
Date: Fri, 6 Nov 1992 14:45:44 GMT

I am looking for advice on cutting a 7.375 inch hole in 3/4 inch MDF.  
DIYourselfers--how do you normally do this?  Do you have to cut it out 
by hand with a jigsaw, or is there some way to drill a hole this size?

Thanks, 
Ray Wakeland
wakeland@ucs.indiana.edu
From: cmh@eng.cam.ac.uk (C.M. Hicks)
Newsgroups: rec.audio
Subject: Re: PNP vs NPN Output Stages
Keywords: Lock
Date: 13 Nov 92 14:47:45 GMT
Organization: cam.eng

matthews@eecs.ucdavis.edu (Thomas W. Matthews) writes:

>As part of the fun going on with the NPN vs PNP topic, a writer states:

>>I'm not sure if the original posting is serious or not, but there could be
>>some foundation to it (ack!  burn me if you will).  I could be mistaken,
>>but the PNP transistor is usually lower in noise than the NPN transistor,
>>due in part to the lower mobility of carriers in the PNP transistor (which
>>are different in the NPN transistors).  Whether this lower noise floor is
>>perceptible, I'd probably doubt it since most amps spec. out a SNR at
>>100 dB or so.

<< STUFF DELETED >>

>I frequently see PNP transistors used in transformerless microphone 
>preamps, in which the amplifier should have a low noise figure when
>driven from a low source impedance (source impedance makes a big difference
>in noise calculations - for low source impedance the equivalent input
>voltage noise source dominates).  However, I can find no evidence
>that PNP transistors have a better 1/f noise constant or a lower
>base spreading resistance.  In the latest Analog Devices data book,
>their low-noise PNP and low-noise NPN transistors are comparable in 
>noise specs. 

It always used to be the case that PNP's were used for their superior noise
performance when driven by a low impedance source. Now, however, more and
more transistors of both NPN and PNP design are approaching the fundamental
physical limits imposed by the materials etc, that transistors of both
types have comparable characteristics.

>It seems that there is no fundamental reason for PNP and NPN transistors 
>to have different noise specs.  But I wonder:  could it be that the 
>N-type material in the base of the PNP transistor, having a HIGHER 
>carrier mobility, would give the transistor a lower base spreading
>resistance?  

I believe this is the case, yes, but I am not a s/c expert :-)

A low base spreading resistance is required for a low
>noise figure for an amplifier operating with a low source resistance.
>Also, custom-designed NPN transistors could use special construction
>to lower the base spreading resistance, thereby mitigating the 
>apparent advantage of PNP transistors.  Does anybody know?

All true - see above!

>I don't think that one can find a simple relationship between
>carrier mobility and "noise".  Also, to understand how the
>various noise sources present in active and passive devices affect
>the overall signal-to-noise ratio, one must take into consideration
>many of the circuit parameters.

Also a good point - there's no point using the quietest transistor in 
existence, just to trash its performance with poor quality passive components.

>Tom Matthews

Christopher Hicks
Newsgroups: rec.audio
From: paulxxxx@leland.Stanford.EDU (paulastya gupta)
Subject: Lost in CD soundspace, ears not good enough!
Organization: DSG, Stanford University, CA 94305, USA
Date: Fri, 13 Nov 92 02:02:42 GMT


Here is a simplistic question about CD players concerning what one
actually hears.  To put this in perspective, my current system consists 
of:

Teac Receiver       
Teac dual tape deck (B,C,HXPro)
KLH 802 speakers, which I may upgrade in a few months
AKG 240M headphones, which I won't upgrade anytime soon

I am in the market for a CD player, and was going to buy the 
Nakamichi CD-2 (or is that the CD4) which lists for $399.  Then 
I went and heard some CD players in the $130-$350 range, and could 
not tell the difference between *any* of them based on only the 
sound.  This test was done by listening to a classical CD with 
a 1-minute portion including the sax. and the sitar to get a 
good feel for the freq. spectrum.  The phones I used were the 
AKG listed above (list $140).  

I told the sales guys to "leave me alone" to avoid being under any
sort of pressure, and switched back and forth between the players.
Still I could not tell the differenece as clearly as I could between
the AKG headphones and $100 Sony phones (I had done a listening test
a month back of a similar nature).

This leaves me confused.  Why should I pay more for 100000X oversampling
or other such stuff?  Am I going about this all wrong?  I have the nagging 
feeling that perhaps the differences are so subtle that they will have an 
effect on you after you have a player for a long time - an hour, maybe.

Any opinions from you experts?

paulxxxx@leland.stanford.edu
(415) 485-3853

p.s. Please reply to me directly since I do not have regular 
news access.  I may compile the resonses and post them the next time
I get this access.   Thanks!
From: winalski@adserv.enet.dec.com (Paul S. Winalski)
Newsgroups: rec.audio
Subject: Re: Defeating SCMS
Date: 9 Nov 92 16:10:38 GMT
Article-I.D.: nntpd2.1992Nov9.161038.12425
Reply-To: winalski@adserv.enet.dec.com (Paul S. Winalski)
Organization: Digital Equipment Corporation, Nashua NH


In article <1dkkpiINNgua@usenet.INS.CWRU.Edu>,
jwk3@po.CWRU.Edu (John W. Kale) writes:
|>
|>	Do DAT decks place SCMS codes on recordings made from the
|>analog inputs?

Yes, they do.  A recording off analog inputs receives a SCMS code of 11.  This
code allows one generation of digital copying to be done.  The copies themselves
will have a SCMS code of 10 (digital copying prohibited).  What we'd like here
is a SCMS code of 00 (unlimited digital copying allowed).

|> If they do not, then simply connecting the analog outputs
|>on the CD player to the analog inputs on the DAT deck should
|>result in a high-quality recording with no limit on the number
|>of digital generations it can, uh, generate.

Alas, this won't work on consumer DAT decks that implement SCMS.  However, many
pro decks, such as Panasonic's SV-3700, allow you to switch-select the SCMS
code you want when you're recording off analog inputs.  The method you describe
works on such decks.

--PSW
Newsgroups: rec.audio
From: palane@iastate.edu (Paul A. Lane)
Subject: Re: HEADphone AMPLIFIERS
Organization: Iowa State University, Ames IA
Date: Fri, 6 Nov 1992 15:19:40 GMT

In <1992Nov5.202846.9406@porthos.cc.bellcore.com> gfl@hera.cc.bellcore.com (lenahan,grant f) writes:

>(Henri Quiniou) writes:
>>    Has anyone compared or simply listened to those 3 headphone amps:
>> 
>>           . Grado,
>>           . Melos,
>>           . Krell KSA5.
>> 
>> None of those company dealers here in Montreal keep those components in stock: they're only ghosts to me. Need help.
>> 
>> PS: Post any reply, I don't have mail!!

I haven't heard any, but the Melos amp just received a glowing review from
Stereophile [as both a head amp and a preamp].
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: HSU subs
Date: 10 Nov 92 00:43:07 GMT
Article-I.D.: pyramid.184191
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA

>In article <1992Nov05.204437.7565@bmerh85.bnr.ca> shiv@bnr.ca (Shiv Naimpally) writes:
>>
>>Does anyone have a phone number/address for HSU research ?
>>Does anyone have references to any mags that reviewed their subs ?
>
In article <lflcrfINNhaj@exodus.Eng.Sun.COM> tsreddy@skitime.Eng.Sun.COM (T.S.Reddy) writes:
>     Check out this month's Audio magazine for a sub shootout between
>Velodyne, Hsu research and a few others. Their feeling was that the Hsu's
>were excellent value for the money but the Velodyne F1500 (?) was the
>best overall.
>
    Or that the HSU does indeed produce LOTSA bass cheap, but that
    its distortion was way higher than the Velodyne, [or IMHO any
    other GOOD powered subwoofer...]

    The HSU did beat several powered subs tested, but IMHO none of
    them are real subwoofers, they are only powered bass modules
    with useful response only down to 30 hz or so.  

    The VPMS subwoofers have the same (actually better) bass
    extension, are also quite efficient, and lower distortion.  
    Remember that bass distortion in a subwoofer can make the
    location audible (even though it DOES increase the apparent
    output...if you don't mind doubling).   
Xref: sparky rec.audio:15030 rec.audio.pro:2307 rec.music.misc:27411 rec.music.marketplace:2233
From: swhst1+@pitt.edu (Steven W Herer)
Newsgroups: rec.audio,rec.audio.pro,rec.music.misc,rec.music.marketplace
Subject: Re: Help me find *special* CORDLESS HEADPHONES
Date: 13 Nov 92 04:36:27 GMT
Followup-To: rec.audio
Organization: University of Pittsburgh

Matt,
	I just thought I could help fill you in on Crutchfield.  They are on
eo fht e most reliable companies in the audio/video mail order business.  They
seem to sell only products they have tested themselves and they also back them
up 100%.  Their service is excellent as well as the quality of the products
they sell.  You might want to shop  around for a better price in your local
area but if you say you can't find the cordless headphones anywhere
Crutchfield is the way to go.  They have next air service available.  Hope
this was helpful.
		Steve Herer
Newsgroups: rec.audio