HDTenEightyP/NetNews huggingface dataset:
From: randyd@csd4.csd.uwm.edu (Randall Elton Ding)
Newsgroups: rec.audio
Subject: Re: DIY Cutting holes for woofers
Date: 6 Nov 1992 17:05:31 GMT
Organization: Computing Services Division, University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4

In article <BxAuC8.BB7@usenet.ucs.indiana.edu> wakeland@silver.ucs.indiana.edu (ray s wakeland) writes:
>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

  When I cut holes in mdf, I use an adjustable hole saw to make a 
  template out of a small piece of 3/8 inch wood.
  Then I tack it on to the baffel board and use a carbide tipped
  router with a bearing as a guide.  I have never used 3/4 mdf
  but I know if you are cutting holes in 1 inch mdf you need to
  use a large router with a 1/2 inch chuck ( I think I used a
  5 horsepower router ) or the router will slow down to much and
  burn the wood.  It makes a very clean hole.
From: chrisc@gold.gvg.tek.com (Chris Christensen)
Newsgroups: rec.audio
Subject: Re: DIY Cutting holes for woofers
Date: 12 Nov 92 17:38:16 GMT
Article-I.D.: gold.5588
Organization: Grass Valley Group, Grass Valley, CA

In article <24141@alice.att.com> jj@alice.UUCP 
(jj, curmudgeon and all-around grouch) writes:

>I use a router with a trammel point (which is what one uses to cut circles)
>and a 1/4" diameter 1" long straight bit.

If I remember correctly this device is fixed in the center of the
circle that you are cutting out, right?

>I cut the hold 95% through the first time, going all the way around,
>and then cut it loose the second time, beinc areful when I get
>to the last few inches.

When you cut through do you let the waster free fall through the hole
or do you have a piece of scrap material on the underside of the
work?

I have done this tupe of work on a pin router and the table of the pin
router "catches" the waste.  I will need to do this without the
benefit of the pin router so I am interested in how others have
sucessfully done it.

I plan to use the scrap-material-under-the-work method with a slight
twist:

I will use small finishing nails through the waste piece into the
scrap under the work to keep the waste piece from breaking loose and
spinning.....
-- 
Chris Christensen                  The opinions I express are my own,
chrisc@gold.gvg.tek.com            and sometimes they are wrong!
916-478-3419 FAX 916-478-3887      After all, I *AM* only human.
Newsgroups: rec.audio
From: nau@ssesco.com (William Nau)
Subject: Re: Programmable CD players
Organization: SSESCO
Distribution: usa
Date: Thu, 5 Nov 1992 15:11:45 GMT

>Most CD players that I've used would *always* glitch between two
>sequencial tracks if you programmed them in.  I know the glitch is
>from the machine doing a 'seek' and quickly reseting itself.  This is
>usually not a problem, but I'm starting to get a good number of 'live'
>CDs or CDs that have songs that segue into the next track.
>
>so if I program a CD player to play:
>
>track 4
>track 5
>
>Who makes a CD player (preferably a multi disk player) that will NOT
>produce a 'seek glitch' between these two tracks?

Back in 1986 when I was shopping for my first CD player, this was a big
problem.  In fact it was the deciding factor between a Yamaha and the
Pioneer (back then it was a better player) that I purchaed.  However,
today I haven't noticed the problem with any CD players.  Perhaps I've
just been lucky and listen to the right ones.  It shouldn't take much
to find one.
-- 
William R. Nau
Supercomputer Systems Engineering and Services Company (SSESCO)
511 11th Avenue South, Suite 216
Minneapolis, Minnesota 55415-1536
(612) 342-0003

nau@SSESCO.com
From: ptb2@ns1.cc.lehigh.edu (PETER TALAN BERGEN)
Newsgroups: rec.audio
Subject: Infinity Speakers - Any Comments
Date: 9 Nov 92 03:08:22 GMT
Organization: Lehigh University


    Has anyone out there had any experience with Infinity Speakers.  I have a
    set and the tweeters are sh*t.  I've blown three in 2 years and Infinity
    gives me the run around with warrenty service.  Every time they have come
    up with a different excuse.  Once they said it was a defect in the
    manufacturing process which they later denied even existed.  Has anyone
    else had any trouble with Infinity speakers or their service department.
    And for the rest of you looking for speakers, DO NOT BUY INFINITY!!!!!!


    
Newsgroups: rec.audio
From: palane@iastate.edu (Paul A. Lane)
Subject: Re: What is a passive preamp???
Organization: Iowa State University, Ames IA
Date: Wed, 11 Nov 1992 16:30:43 GMT

In <1992Nov11.160157.13581@bmers95.bnr.ca> quiniou@bnr.ca (Henri Quiniou) writes:

>I'm ready for technical crop: what is a passive preamp??

No active circuit elements (IC's or transistors). The unit only contains what
are referred to as passive components (resistors and switches). I'm not sure
about capacitors and inductors but I don't think they're used).

>What is it used for (differences with "active" preamp)?

The signal goes through as little processing as possible.

>Why are they so fussy about matching impedance?
>BTW, what's a buffered preamp?

I'll put these two together. Stereo components are not designed to drive
power amplifiers directly. [I'm not going to go into all the details about
input impedence and ouptut impedence.] Depending upon the power amp and
the source components, they may not mate well with each other.

A buffered preamp is a compromise between a passive and an active preamp.
It contains a unity gain circuit which will take care of all the impedence
problems, but provides no gain. In other words, the CD player or tape deck
still sets the voltage levels but is no longer driving the power amp.
Hopefully, this gives one the benefits of minimal signal processing but
without impedence matching problems.

>Henri Quiniou

I've kept this discussion deliberately non-technical (mainly so I don't have
to check my facts). Other posters feel free to correct me.

Paul Lane

Newsgroups: rec.audio
From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
Subject: HELP!  With Cosmetic Repair... PLEASE
Organization: Skidmore College, Saratoga Springs NY
Date: Sun, 8 Nov 1992 07:10:13 GMT

Well, I screwed up.  
I am borrowing some B&K equiptment from a store in my area for the
week (until Thursday) and I scratched the top surface in a couple of
spots where my CD player was sitting.  They are small, though quite
visible, marks and I have a feeling that I'll have all kinds of
problems when I go back with the components.
So, I need to cover the small marks with something that will not come
off with Windex or similar cleaners that they use to remove finger
marks, etc.  I started with a black pen (a rolling writer) and that
completely hides the marks, but it isn't permanent enough.  I'd also
hate to have them clean the component while I'm there, and find the
marks.  UGH!  
I know that I should really just tell them what I did and hope they
don't kill me, but the damaged component is used to begin with and...
I may consider this option.  If I can cover the damage well enough
though, no harm is really done.

For those unfamiliar with B&K finish, (it's a CS-117 preamp for the
record) it has a black matte speckled finish.  
Might a car wax work?  I'll consider just about anything.

Thanks for any ideas!
				- Jason
-- 
---------------------------------------------------------------
\ 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: moskowit@panix.com (Len Moskowitz)
Subject: Re: Cheap DAT tapes
Date: Wed, 11 Nov 1992 20:31:48 GMT
Organization: PANIX Public Access Unix & Internet, NYC

In article <9211111641.AA05252@cabell.vcu.edu> csc2mxs@cabell.vcu.edu (Marko Siladin) writes:
>Hi!
>
>Where can I find cheap DAT tapes? Here in Richmond the price is ~$14
>for a Sony 120 minute tape. I know that I paid 16 DM in Germany last
>year for the same type. So there must be a place in the states where
>I can order DAT tapes at a lower price than here in Richmond.

J&R Music World in NYC (they have an 800 number so call 800
information).  Also Uncle's Stereo on West 72nd Street in NYC.  Both
have 120 minutes DATs for under $7 each.

Subscribe to the DAT-heads mailing list to get this kind of
information:

		DAT-heads-request@fuggles.acc.virginia.edu




-- 
Len Moskowitz
moskowit@panix.com
Newsgroups: rec.audio
From: swkong@midway.ecn.uoknor.edu (Sieg Wooi Kong)
Subject: Recommendations for bookshelf speakers???
Date: Mon, 9 Nov 1992 02:35:03 GMT
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA


I'm writing in for a friend of mine.
He's thinking of getting a good pair of bookshelf size speakers.
He's willing to part with $350++ on it but doesn't know what's the best
deal on it.
So if you are knowledgeable in this field him in on the market.
You could write to him at shtan@uokmax.ecn.uoknor.edu or just
post it for others to read too.
All help will be greatly appreciated.

Thanks.
On behalf of Seng Hin, Tan....this is Melvyn Kong signing off.

swkong@uokmax.ecn.uoknor.edu
University Of Oklahoma.
Live Long and Prosper!
Newsgroups: rec.audio
Subject: Re: Dennon vs. Sony
From: oberland@vax.sonoma.edu
Date: 10 Nov 92 05:28:26 -0800
Organization: Sonoma State University

A couple things:

I run my system in what amounts to an oven, or at least I think so.
No air conditioning in summer.  My AMP gets so hot that I have an external
fan to keep the solder from melting on the power supply.
(so, I exaggerate, but it does get in the 300+ degree range if left on for
long periods.)  Generates enough heat to not need a space-heater in the room
during winter(would guess 2-400 watts).

I spend a lot of time with IC's and have a distrust of their reliability
when it comes to heat.  ALL computers today that are meant for heavy use have
a fan on them, yet, no audio components under 1-2K have them.
hm...
Many simmilar IC's. Plenty of heat generated. What gives?
I will trust devices that don't use IC's more.

I think my player is better than anything available at the time that I bought
it, for the price that I bought it at.  Now, it does not compare to high-end
models, but since the original poster was a student, I figured that he did not
buy a pro/studio quality CD-player.  Low-end systems are more like it.

My machine has better buttons and a real LED display.  NO sony's had such
"features" when I bought mine.  My machine was also the only one with A>B
sampling available at the time that I could find. My machine was the ONLY one
with a metal chassis, too.(was looking in the 300 or less range)

Also, you overdrive an IC, and you risk frying it.  Same for a transistor.
BUT an IC is a yes/no device.  Works perfectly, or not at all.  Transistors
are not quite the same, and can still work to some degree with damage to them.

All in all, I am happy with my Dennon, and have listened to Sony's and Dennons
recently(this week), again, and they sound about the same.  Real subjective.
Quality of construction for the same price range?  No contest.  Dennon wins.

I know which one I would buy.
Newsgroups: rec.audio
From: hquiniou@bnr.ca (Henri Quiniou)
Subject: a match for GRADO headphones
Reply-To: hquiniou@bnr.ca (Henri Quiniou)
Organization: Bell-Northern Research Ltd.
Date: Thu, 5 Nov 1992 21:03:21 GMT

    I want to know what you are matching Grado's Signature (HP2) headphone with?
Does plugging it at the amplifier output (through a QED-like box) sounds good or having a dedicated headphone amplifier is really worth it?
     I'm sorry, but I couldn't find headphone amp to listen to in my area because ... I don't know why!!! (have any idea?) Please go ahead: list whatever component you liked and the way the whole thing was connected.

JUST POST (followup) any reply because I don't have e-mail here in BNR.

Thanks,

Henri Quiniou
From: tsreddy@skitime.Eng.Sun.COM (T.S.Reddy)
Newsgroups: rec.audio
Subject: Re: HSU subs
Date: 6 Nov 92 18:03:27 GMT
Organization: Sun Microsystems, Mt. View, Ca.
NNTP-Posting-Host: skitime

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 ?

     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.

     Also, Stereo Review had a write-up a month or two ago on them and
was all praise (coming to think of it, I haven't seen one product that
they have reviewed which they haven't praised :-)).

T.S.Reddy
e-mail: tsreddy@Eng.Sun.COM
Newsgroups: rec.audio
From: bill@bilver.uucp (Bill Vermillion)
Subject: Re: MD and DCC
Organization: W. J. Vermillion - Winter Park, FL
Date: Sun, 8 Nov 1992 15:39:11 GMT

In article <Nov.7.17.13.24.1992.29321@gandalf.rutgers.edu> rgonzal@gandalf.rutgers.edu (Ralph Gonzalez) writes:
>Mind if I slip into this thread?
>
>I sure hope that DCC dies a horrible death and MD survives. MD has the
>advantage of reliability and fast access. DCC's only advantage is that
>of compatibility with an old standard.

Just a question.  How have you determined the reliability of
the MD?

You won't know reliability  until they have been on the market for at
least a year - and in quantity.  Just because these units are
based on prior technolgy doens't mean the their implementations
will be flawless.

I have seen too many 'new' audio devices/technology that have
come on the market in the past 20 years that have just slipped
away never to be heard from again.

I truly beleive all the MD vs DCC discussion is useless
discussion, based on guesses - some informed and other
uninformed.   Why not continue this after they have both been
on the market for about 6 months?

-- 
Bill Vermillion - bill@bilver.oau.org  bill.vermillion@oau.org
                - bill@bilver.uucp 
                - ..!{peora|tous|tarpit}!bilver!bill

Newsgroups: rec.audio
From: nau@ssesco.com (William Nau)
Subject: Re: How 'bout a new group for the rest of us?
Organization: SSESCO
Date: Thu, 12 Nov 1992 13:51:37 GMT

In article <1992Nov12.003105.69226@ns1.cc.lehigh.edu>, ptb2@ns1.cc.lehigh.edu (PETER TALAN BERGEN) writes:
|> In article <1992Nov11.020415.8305@dunix.drake.edu>, kjt001@dunix.drake.edu (Devi
|> l Bunny!) writes:
|> >How about making a new group called something like
|> >rec.audio.college.student or rec.audio.penniless.  Almost every
|> >conversation that occurs here is pointed to those who have $10k to spend
|> >on audio equipment.  It would be nice to know that maybe somewhere out
|> >there are other people with as little money as I.  <sigh>
|> >
|> >
|> >--
|> 
|> I could not agree with you more, I am f**cking sick and tired of listening to
|> people ask questions whether they should a stereo for $10,000 or $13,000.  I
|> am personally a little offended that someone would spend that much money on a
|> stereo when there are so many bigger problems today.  We definitely need a
|> college audio board.

Stay away from rec.audio.high-end then.  I dunno about a college audio board.
That kind of implies noncollege types shouldn't bother.  rec.audio.low-end,
rec.audio.cheapskate, rec.audio.realistic (not the brand)  or 
rec.audio.normal-people may be better.

Also, I don't think it's as bad in this board as you may think.  Sure half of
the people look down at you and your Panasonic crap.  The other half of the
people are open minded and have no problem acknowledging your level.
Sometimes they do try to show you something a little bit better in an attempt
to help.  Often you can do a lot better if you steer away from the popular 
(ex. Sony) brands and go for their weird ones at the same price.  Sometimes
they get carried away.
-- 
William R. Nau
Supercomputer Systems Engineering and Services Company (SSESCO)
511 11th Avenue South, Suite 216
Minneapolis, Minnesota 55415-1536
(612) 342-0003

nau@SSESCO.com
From: ebd0@ns1.cc.lehigh.edu (EDWARD BAYKAR DERVISHIAN)
Newsgroups: rec.audio
Subject: Re: Portable CD Problem
Date: 11 Nov 92 15:30:50 GMT
Organization: Lehigh University

In article <7490246@hpfcso.FC.HP.COM>, yip@hpfcso.FC.HP.COM (Tom Yip) writes:
>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)
>
I have had the same problem with my portable Sharp cd player. I went in and
they said that nob was cracked and they showed me. It turns out, usually, you
have to buy the whole motor along with that plastic part because they don't
sell them seperately. The whole thing would cose $125 or thereabouts. They had
a motor that didn't work however, so they took the plastic nob off that and
were able to use it. I asked why that happened and they said that it was made
out of plastic and therefore it breaks all the time on many portables and
there's nothing you could do about it. They said even the stereo unit cd
players were made of plastic these days...especially those 5 disc changers and
if the tiniest piece broke off those, that was the end of the whole cd player
unless you wanted to dish out a bunch of money.
                           Ed

                           
-- 
////////////////////////////////////////////////////////////////////////
Edward Dervishian - The Eternal Spirit of the Underworld!
PHONE:  1-215-758-1409      * "Either up your nose, or through your
ADDRESS:  Box 0686          *  vein, with nothing to gain except
          Lehigh University *  killing your brain! Freeze!"
          Bethlehem, PA     *
          18015             *
Newsgroups: rec.audio
From: rsd@sei.cmu.edu (Richard S D'Ippolito)
Subject: Re: PNP vs NPN Output Stages
Keywords: Lock
Organization: The Software Engineering Institute
Date: Mon, 9 Nov 1992 21:46:06 GMT


In article <1992Nov9.113458.16272@EE.Surrey.Ac.UK>, Rob Bish writes:

> ***** if you like Bach use NPN *****
> ***** if you like Chopin use PNP ***
> 
> ...Has anyone else observed this effect, and can they shed any light on the
> cause?
> 
> Rob Bish.

I've noticed the same thing, and furthermore, I get better depth perception
when listening to baseball and football broadcasts through FETs.

Rich
Newsgroups: rec.audio
From: wkung@sail.uwaterloo.ca (Bill Kung)
Subject: Re: PNP vs NPN Output Stages
Keywords: Lock
Organization: University of Waterloo
Date: Tue, 10 Nov 1992 17:16:05 GMT

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.  Of course, that SNR is at a certain output (full output or
at 1 W or so?), I think, so there may be a perceptible difference at low-
level passages, especially with class A amplifiers (which are biased on
all the time).  The NPN transistor is usually used over its complementary
PNP device because it has higher transconductance (and gain) characteristics
but considering the frequency demands of audio applications (20 Hz-20 kHz),
and since the output stages are usually run as emitter-followers (unity     
voltage gain), a PNP output stage may be feasible.  The lower transconductance
means, however, that it may not have enough speed to control reactive (i.e.
capacitive) loads.  Does that make any sense?
From: R.Bish@EA.surrey.co.uk (Rob Bish)
Newsgroups: rec.audio
Subject: PNP vs NPN Output Stages
Keywords: Lock
Date: 9 Nov 92 11:34:58 GMT
Organization: ExtrAudio Gbmh


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?


Rob Bish.
Newsgroups: rec.audio
From: jreiser@scott.skidmore.edu (Jason Reiser... Asleep)
Subject: Help with port sizes please!
Organization: Skidmore College, Saratoga Springs NY
Date: Thu, 12 Nov 1992 07:09:35 GMT

I am looking to build a pair of speakers, and I need a port measuring
3.25 inches long and 1.6875 inches in diameter (that's 1 11/16 BTW)...
anyway, is there any way of figuring out what alternate diameter port
I could use that is available from plumbing suppliers... like 1.5" or
1.75" diameter... but how do I go about calculating the corrected
length for the different diameter port?  I know that it is not a
conservation of internal air volume, but what is it?

Thanks for any help!

				- Jason
-- 
---------------------------------------------------------------
\ 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