From: Maciej Rutkowski <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, January 16, 2000 12:36 AM
Subject: MD: Odp: Odp: ATRAC-R and Laser Colors
> well, right - I forgot about the good speakers thing.
> I've got a pair of good speakers(tannoy to be more exact), but the
amplifier
> is a disaster but still I was able to actually see a 10Hz wave produced by
> my good old Gravis Ultrasound MAX card. :)
NOt bad speakers Tannoy.. I have a set of 4 mercury M3s that I use on my
sound card. Surround sound is great! I have 2 Rotel RA940 amps to drive
them. Perhaps somewhat sensibly, the amp prevents DC current from moving the
cones, so when I got to 12Hz the system cut in and stopped all flow to the
speakers. The cones moved, but I couldn't feel anything until I hit about
25-30Hz when I felt a slight breeze. Given the power of the speakers and amp
combo, I think you would need about a 20kW system before a 1Hz tone would
make any difference.
> Why ultrasound emitters? Most nice tweeters exceed even 40kHz freqs! What
do
> you think they have such specs for?
Marketing. Name me one piece of audio technology you have that can actually
produce a frequency that high, other than a frequency generator. Also,
because the response is not linear in a speaker, it is often necessary to
have a unit capable of exceeding the top frequency you want to ensure
accurate reproduction. Just because a speaker can make a 40kHz tone, does
not mean it can do so as responsively or accurately as it can reproduce the
22kHz tone you are after.
> OK, so maybe one can't hear a difference between the cd and md with a pair
> of desktop speakers...
Depends on your desktop speakers.... mine are quite good... although for
practicality I put them on the floor with speaker stands - they take up way
too much space on the desk.
Magic
--
"Creativity is more a birthright than an acquisition, and the power of sound
is wisdom and understanding applied to the power of vibration."
Location : Portsmouth, England, UK
Homepage : http://www.mattnet.freeserve.co.uk
EMail : [EMAIL PROTECTED]
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