HDTenEightyP/NetNews huggingface dataset:
From: smee@bristol.ac.uk (Paul Smee)
Newsgroups: rec.audio
Subject: Re: 'Bookshelf' Speakers???
Date: 23 Dec 92 12:06:54 GMT
Reply-To: P.Smee@bristol.ac.uk (Paul Smee)
Organization: University of Bristol

In article <BzouMM.700@news.cso.uiuc.edu> mso26892@uxa.cso.uiuc.edu (Tal ) writes:
>Also consider Wharlfedale Diamond
>IV($300) which are reviewed by Stereophile to be musically enjoyable.

What, 300 US$?  Ought to be half that, given the UK price and the
present exchange rate.  Nevermind, another of life's little mysteries.

Might have trouble finding Diamond IVs, as Wharfedale have just
replaced them with the Diamond V.  (On the other hand, that might mean
you could find someone clearing them out at a discount.)  Apparently,
the primary difference is that they've retuned the bass port a little
bit.  I haven't heard the V's yet.  The IV's are very nice, and I run a
pair as remotes in our back 'porch'.

I have seen 2 reviews of the V's, one of which thought they were better
than the IV's, and one of which thought they were worse.  Who knows?
If it means anything, the reviewer who thought that V's were an
improvement over IV's works for a mag which reviews only classical
music; the reviewer who thought V's were worse works for a mag where
jazz and rock are the most common types of music used for tests.

-- 
Paul Smee, Computing Service, University of Bristol, Bristol BS8 1UD, UK
 P.Smee@bristol.ac.uk - ..!uunet!uknet!bsmail!p.smee - Tel +44 272 303132
Organization: Penn State University
Date: Wed, 30 Dec 1992 19:41:23 EST
From: <SRJ102@psuvm.psu.edu>
Newsgroups: rec.audio
Subject: HELP! Impedance question!


   Hi all,

           I have a question (or maybe it's several rolled into one...)

       I'm about to plug some old speakers of unknown impedance/wattage/etc.
    into a 40 watt power amp that says WARNING  8 ohms minimum...

    Am I going to break/blow up/melt something, or am I okay as long as I keep
  things from distorting?

         Your help is greatly appreciated...

                 Please answer as soon as possible, because I might get impatie
nt and just try it...  :)

              Thanks in advance, and please respond via Email, as I don't think
           this question is worth the space...

                                              -Scott
Newsgroups: rec.audio
From: colint@spider.co.uk (Colin Tinto)
Newsgroups: rec.audio
Subject: Re: MiniDiscs -- What Are They?
Date: 22 Dec 92 13:04:42 GMT
Followup-To: rec.audio
Organization: Spider Systems Limited, Edinburgh, UK



OK, OK, I boobed...

I thought that since both MD and DCC use lossy compression algorithms they
may have been the same.

I was wrong.

Totally and utterly wrong...

I'll write my 100 lines now :

I must not post gibberish without checking the technology.
I must not post gibberish without checking the technology.
I must not post gibberish without checking the technology.
I must not post gibberish without checking the technology.
.
.

:-)

-- 
/-----------------------------------------------------------------------------\
!   Colin Tinto			!  Time Travel Parcel Deliveries Inc          !
!   colint@spider.co.uk		!  The only courier with previous day service.!
\-----------------------------------------------------------------------------/
Newsgroups: rec.audio
From: joe@avs.com (Joe Peterson)
Subject: How to convert coaxial to optical
Organization: Advanced Visual Systems Inc.
X-Newsreader: TIN [version 1.1 PL8]
Date: Thu, 31 Dec 1992 21:41:46 GMT

Is there a way (i.e. device) to convert the coaxial output that
so many CD players have to an optical one (used by many DAT
players)?

					Joe

Newsgroups: rec.audio
From: georgec@eng.umd.edu (George B. Clark)
Subject: Re: Tuner/receiver with best AM reception
Date: Wed, 23 Dec 92 14:27:47 GMT
Organization: University of Maryland


I got two replies both stating the General Electric Super Radio II is the
best radio/tuner/receiver for AM reception. It costs about $40, and it
can be purchased from Best.

Unfortunately, the II has been superceded by the III, which is said to
have worse AM reception.

Anyway, I went to a high-end audio retail store, and they told me
Nakamichi makes the best receivers. The Receiver I and Receiver 2 by
Nakamichi are the two they recommend. They cost several hundred dollars.

I may end up buying a Nakamichi since my stereo receiver is 20 years old.

Anyway, those of you who only listen to FM music stations are missing out.
The AM stations where I live include:

      the audio of CNN cable news
      Dr. Gabe Mirkin's daily medical talk program
      weekly program on gardening, and house maintenance
      programs by CPAs and financial advisors on investing
      etc.
From: mike@banana.fedex.com (Mike Bearden)
Newsgroups: rec.audio
Subject: Re: Please suggest Audio magazines!
Date: 31 Dec 92 00:14:17 GMT
Organization: Federal Express Corp.

CARVER@Polyester.CS.UMASS.EDU writes:

i must say that i enjoyed norman's comments on the various US magazines.

>(Note:  there are many other non-US and even US audio magazines.)

norman, would you or could somebody else characterize some of the
non-US, particularly the british magazines in the same manner?
i see these at the bookstore, and never know which ones more closely
resemble stereophile and tas as opposed to the mass market publications.

mike
Newsgroups: rec.audio.car
From: Daniel.Carr@launchpad.unc.edu (Daniel Carr)
Subject: denon head,alpine amps/eq,kenwood box,polk tweets
Organization: UNC Office of Information Technology
Distribution: usa
Date: Fri, 25 Dec 1992 16:36:35 GMT


Car audio system for sale.
        Denon high power deck (pull-out)
        Alpine 30w amp
        Alpine 18w amp
        Alpine 7 band graphic eq
        Polk Audio tweeters
        Kenwood speaker enclosure
 
 
All equipment purchased new less than 18 months old at Dashboard Stereo (have
dated receipts). Includes all boxes and documentation.
 
Best reasonable offer for all or part.
 
For more information, please call Daniel at (919) 467-5753.
 
 
Details:
 
Denon DCR-5390 Stereo Cassette Receiver
Power:
        10W x 2ch 20Hz- 20kHz/4 ohms 0.8% THD
Features:
        Theft Prevention Chassis (Pull-out)
        Auto-reverse
        Dolby B
        Music Search
        Metal tape switch
        24 station presets
        Fader
        1 Preamp output
        D-Mount/Din "E"
	CD/Aux input on front
 
Alpine 3522 Power Amplifier
        30W x 2ch, 20-20kHz/ 4 ohms, 0.08% THD
        Bridged: 80W X 1ch, 20-20kHz/ 4 ohms, 0.8% THD
        RCA inputs
        Gold plated terminals
 
Kenwood KSC7701 Speaker Enclosure
        10in 3 way speaker system
        Bass-Reflex Type
        Woofers:        10" cone x 2
        Mid-range:      3.5" cone x 2
        Tweeters:       2" x 2
        Impedance:      4 ohms
        Peak input power:       200w
        Rated input power:      100w
        Frequency Response:     35Hz-20kHz
        Crossover Frequency:    2kHz, 6kHz
        Dimensions:     32" x 11" x 16" (rounded)
        Weight: 41.5 lbs.
 
Alpine 3319 7 Band Graphic Equalizer
        Preamp and speaker level inputs
        Dual preamp outputs with Fader
        Lighted slide controls
        Input level indicator
 
Alpine 3503 Power Amplifier
        18W x 2ch, 20-20kHz/ 4 ohms, 0.8% THD
        RCA and speaker level inputs
 
Polk MM 1200 .5" Dome Tweeters
        Frequency Response:     3500-20kHz
        Impedance:      4 ohms
        Sensitivity:    92db
 

--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
Newsgroups: rec.audio.car
From: demaine@ee.ualberta.ca (Cal Demaine)
Subject: Re: Box Volume
Organization: University Of Alberta, Edmonton Canada
Date: Wed, 23 Dec 1992 06:10:48 GMT

jreiser@scott.skidmore.edu (Jason Reiser... Asleep) writes:

>To build a box with two identical woofers sharing an air space, you
>calculate the volume as normal, but enter the Vas as twice the value
>of one driver.  Note that the drivers can be mounted physically out of
>phase... or course this must be corrected so that they both compress
>the airspace at the same time... not electrically out of phase.  The
>advantage to this is that lower driver distortion results as a result
>of the drivers being out of phase with each other physically.

Well, I agree with Jason about the (small) benefit of mounting the drivers
physically out-of phase.  However, I do not see the need for multiplying the
Vas by two when you can just multiply the end volume by two...

Awe hell, it's just as easy either way.

>	Note that doubling the Vas can be done in designing vented
>enclosures as well.

I'm interested.  Does this work?  Consider that the moving mass of the cones
is doubled, the effective surface area is doubled, and the resistance is
either halved or doubled.  Does all this come out in the wash?

>				- Jason

  - Curious, and likely wrong,
     - Cal

-- 
--------------------------------------------------------------------------------
  - Cal Demaine                   | "You shot him in the back!"                 
    (demaine@bode.ee.ualberta.ca) |    "His back was to me!"  - El Diablo    
--------------------------------------------------------------------------------
Newsgroups: rec.audio.car
From: hanson@tss.com (Hanson Loo)
Subject: Problems with Sony 5180 CD?
Reply-To: hanson@tss.com (Hanson Loo)
Organization: Teknekron Software Systems. Inc.
Date: Mon, 28 Dec 1992 17:12:05 GMT

Hi,

I recently picked up the Sony 5180 CD player and it 
seemed to work fine until I took a long trip recently.
It seems to be quite picky about the CDs it will load.
The same CDs that won't load, will play fine in the
home unit, also a Sony. As a matter of fact, the same
CDs will play in the other car unit a Sony 4040. Has 
anyone else experienced similar problems? Should I be
taking this "dog" in for warranty work? Thanks in
advance.

            Hanson
From: cjm9321@hertz.njit.edu (The InfoMan)
Newsgroups: rec.audio.car
Subject: Box Volume
Date: 21 Dec 92 13:42:52 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.


	Hello all,

	I was just wondering if there is a way to calculate the volume
of a sealed box using 2 speakers in the same enclosure.

	AAll the programs I've seen ask you for the box volume. So is
there a formula for it that will tell me how much I need to optimize my
speaker?


				Thanks,

-- 
M A D E   .   . .---. .---.    \  Buy U.S.A. products,  /    xxxxx ==========
  I N     |   |  \    |___|    <     It's YOUR job.     >    xxxxx ========== 
 T H E    |   |    \  |   |    <  Christopher J. Massa  >    ================
-------   `---' `---' '   `    / cjm9321@hertz.njit.edu \    ================
From: jrp@netman.Widener.EDU (Joshua R. Poulson)
Newsgroups: rec.audio.car
Subject: Re: Why so much power?
Date: 22 Dec 92 21:22:12 GMT
Reply-To: Joshua.R.Poulson@cyber.Widener.EDU
Organization: Widener University Dept. of Computing Services
NNTP-Posting-Host: netman.widener.edu

In article <1992Dec22.194940.27109@csc.ti.com>, ajones@dadd.ti.com (Alan Jones) writes:
|> Anyway, why do cars require so much power to produce quality music?  Most good
|> systems seem to include hundreds of watts of amplifier power.  My home system
|> has only 45 watts, and it's so loud I never turn it up past 50%.  The area
|> inside a car is so small - I'd expect that you wouldn't need much power to fill
|> it with quality music.  What's the deal?

Ah, yes. The perennial question. At any rate the answer is difficult to
express without demonstration... but it revolves around two important
points: realism, and dynamic range.

When you go to a concert that is properly set-up, you find yourself the 
focus of thousands of watts of musical power and you can hear each note
in the magajoules of energy directed at those delicate bones in your ear.
The reason for so much power there is to give everyone the benefit of 
hearing the slightest noise in the band's performance... the nuances...
the individual sounds.

When you attend a concert like an unpowered orchestra there is still
a massive amount of amplification by the very design of the hall, and 
again there are many sources of music and you shouldn't wonder that they
all sweat. (It ain't just because of the tuxedos).

At home, it takes less power to give hints to this dynamic range, but the
truly incredible sound setups in the home are again megawatt extravaganzas.
My personal setup features 1200 watts of power... The neighbors seldom
complain if I invite them over for movie nights.

In the car, a lot of energy is lost because of poor speaker placement, the
materials in the car damping the sound and several other factors. The
reason my car is running at a rated 770 watts is for the dynamics. Kick
drums sound like kick drums. Guitars with distortion don't get extra 
distortion from nasty speakers and overdriven amplifiers, and the concerts
in my car do a fair job of approximating the concert experience.

No one's car or home system can approximate the real thing (not until the
recording industry goes up a few notches, and the rest of the audio
industry follows their lead) but you can get closer with a lot of power
and signal processing.

Dynamic range: the difference between the quietest and loudest discernible
sounds on playback.

Realism: Does it sound like it did when the band recorded it?

-- 
Joshua R. Poulson, Systems Programmer, Computing Services, Widener University
jrp@cyber.Widener.EDU, jrp@netman.Widener.EDU, poulson@cs.Widener.EDU, et al.
Newsgroups: rec.audio.car
From: cces@ecf.toronto.edu (Congress of Can Eng Students)
Subject: Re: dB, volts vs. watts (was Re: Why so much power?
Organization: University of Toronto, Engineering Computing Facility
Distribution: na
Date: Sat, 2 Jan 1993 02:26:46 GMT

In article <demaine.725929293@ee.ualberta.ca> demaine@ee.ualberta.ca (Cal Demaine) writes:
>Now, nobody flame me too bad if I'm wrong, but I believe I know the reason
>for units like dBV and dB SPL.  (And there are more that I forget.)
[...]
>Otherwise, dB represents a gain or attenuation, as with amplifiers.
>
I missed the original posting but here it goes...

	dB SPL is the Sound Pressure Level in dB with respect to
	       20 uPa (micro pascales 10e-6 Pa) which means 0 dB SPL
	       would represent an acoustical pressure of 20uPa

	dBA is the A weighted acoustical pressure level in dB again with
	       a 20uPa reference point.  There is other weightings like
	       B, C, etc.  'A' weighting is an adjustment of the actual
               (dB SPL) sound pressure level to follow human hearing
	       curves.  Low frequency SPL's are weighted less than
	       higher frequencies since the SPL of low frequency sounds
	       must be higher for us to be able to hear them.  This is 
	       usually used to measure sound exposure levels in factories
	       and such.  It allows a more accurate picture of hearing
	       damage from sound exposure.

Hope this helps.


-- 
 ________________________ __________________________ _________________________
/ Brian Campanotti       |                          |                          \
| Electrical Engineering | cces@ecf.utoronto.ca     | "...it wasn't a lie...   |
| University of Toronto  | campano@ecf.utoronto.ca  |  it was just             |
From: bell@hops.larc.nasa.gov (John Bell)
Newsgroups: rec.audio.car
Subject: Re: subwoofers/boxes
Date: 30 Dec 1992 14:55:18 GMT
Organization: NASA Langley Research Center
NNTP-Posting-Host: hops.larc.nasa.gov

In article <1992Dec29.091615.20341@schbbs.mot.com> bstdenis@mailbox.fwrdc.rtsg.mot.com (Brian St. Denis) writes:
>
>I have a 12" MTX RTP woofer (2 voice coils, their top of the line, $110)
>in a 1.6 cu. ft. box, vented.  The information that came with the woofer
>says it should be 1.7 cu. ft. box, but otherwise it is exact to specs.
>My buddy has a Petrus Prowler PZ 124, $130, in a 2 cu. ft. box, vented
>according to his instructions.  I hooked my woofer and box up to his amp.
>There is no competition, the Petrus is way better, way lower, way cleaner,
>even louder.  My MTX even grounds out once in a while the Prowler woofer did
>not even though it was producing much more bass.
>
>My question is can the difference in woofers make such a huge difference?

Cal has already responded to some of your questions so I won't repeat his
advice. You didn't mention the dimensions of the port in your box, so I 
can only assume you built it according to MTX specs. A few weeks ago, there
was a nice article posted describing how to tune the port after you have
built the box. Although you have some leeway in box volume, there is very
little leeway in the dimensions of the port, so the tuning process can be
very important and can make a significant difference.

As far as the differences between drivers, you DO generally get what you pay
for. Designing a good driver is an extremely complex compromise between
competing design goals, and it takes money to figure out the best way to get
what you want. I don't know the specs for the two drivers you mentioned, but
if the Petra has higher power handling capacity, I certainly would expect it
to sound better (all other thing being equal) if you have enough power.

-----
John Bell
NASA Langley Research Center
bell@hops.larc.nasa.gov

Newsgroups: rec.audio.car
From: bob@MorningStar.Com (Bob Sutterfield)
Subject: recommendations for a minivan on a budget?
Organization: Morning Star Technologies
Date: Sat, 2 Jan 1993 13:41:18 GMT

We're about to take delivery of a Plymouth minivan, so now's the time
to think about endowing it with sound.  Our budget is $800-$1000, and
we have no desire to build a rolling boom box.  Our tastes run to jazz
(Stanley Turrentine to Woody Herman), blues (Robert Johnson to B. B.
King), bluegrass, Russian symphonies, and the occasional Beatles, or
Blood, Sweat, and Tears, or ELP.  We don't turn the sound levels up
very high, but a lot of our music is from "acoustic" instruments that
we also play ourselves, so precision is important.

We plan to start with something like the Sony XR-U550 (FM/AM/Cassette)
in the dash, then install decent speakers (6x9 rear, 5.25 front), then
something like the Sony CDX-U300 CD changer under the driver's seat.
After all that settles in, we may want to add an amp to provide more
headroom than the 20W per channel we'll get from the in-dash unit.

What speakers should we use?  The last speakers I liked at all were a
pair of Jensen TS-6905's that were stolen three cars ago, but that
design must be a generation or two old by now.  And besides, a Mustang
was nothing like a Voyager, so the environment will be all different.
We don't want any components or speaker enclosures that will take up
any floor space or protrude from the walls in back, so a giant
subwoofer cabinet is infeasible.

Any other component suggestions?  What else should we be considering?
--
Bob Sutterfield, Morning Star Technologies            +1 614 451 1883
1760 Zollinger Rd, Columbus Ohio USA, 43221           +1 800 558 7827
bob@MorningStar.Com                                   +1 614 459 5054 (FAX)
From: keys@starchild.ncsl.nist.gov (Lawrence B. Keys)
Newsgroups: rec.audio.car
Subject: Delayed Remote Turn-on Output Terminal
Date: 30 Dec 92 20:17:33 GMT
Organization: National Institute of Standards & Technology

Hi All,

I recently bought a Pheonix Gold AX-406A Electronic Crossover and
i have a question about one of its features.

The terminal connector has four inputs. One for:
	- 12v +
	- ground
	- remote turn on lead
		and
	- Delayed Remote Turn-On Output 

The instructions say "Connect to all other signal processors
remote turn-on input terminal.  This connection delays the turn-on/off
of connected components.  This delay helps eliminate on/off thump
caused by brand incompatibility."

My questions are:

Is this feature something that is normally found on a crossover? Should
i use it?  If i do use it, what would be the procedure for connecting
more than one amp (specifically two)?

BTW, where is J.C. Hamlin & Robert Lau.  I haven`t seen any post from
these guys in a while!
                                                  .  
                                                 /                
Larry                            __/    _______/_                 
keys@csmes.ncsl.nist.gov       /                  \               
                          _____     __     _____    \------- ===
            ----------- / ____/   /  /   /__  __/              \
         /     ___    /  / ___   /  /      / /    ____          |
        |    /      \/ /__ /  | /  /__  __/ /__ /       \      / 
        /___         \_______/ /_____/ /______/            ====OO
            \       /                           \       /         
                -                                   -
       ---------------- FAHRVERGNUGEN FOREVER! --------------------            
            The fact that I need to explain it to you indicates
            that you probably wouldn't understand anyway!
       ------------------------------------------------------------
Newsgroups: rec.audio.car
From: tendico@hubcap.clemson.edu (Todd Endicott)
Subject: 4x10 Speakers
Organization: Clemson University
Date: Wed, 30 Dec 1992 19:01:43 GMT

Hi there! I'd just like to gather some opinions on 4x10 speakers. It's
time for me to swap out the ol' Delco and get something real. So, are
4x10's innately inferior to 6x9's, or not? Thanks a bunch.

-- 
Todd Endicott
tendico@hubcap.clemson.edu					 "Yow!"