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Old April 3rd 08, 02:33 AM posted to rec.radio.amateur.antenna
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Posts: 182
Default Antenna physical size


"Richard Clark" wrote in message
...
On Mon, 31 Mar 2008 23:47:00 +0100, "Mike Kaliski"
wrote:

Hi Richard,

I have a pair of computer speakers sitting on my desk that completely out
perform the so called ultimate hi-fi floor mounted tower system speakers I
bought 35 years ago for the equivalent of several thousand dollars in
today's money.


Hi Mike,

I have a set of 30 year old Pioneers that still kick ass. The Pioneer
amp feeding any other set drives them into distortion where the
Pioneer speakers still have more range to go.

Never needed to push the amp above 4 to be heard outside.

OK, so much for the merits of qualitative reports, otherwise known as
testimonials. Proves nothing.

The old speakers still work just fine but the audio experts
have learned how to squeeze that performance out of a speaker that old
audio
theory predicted couldn't possibly work.


Magnetics got better, and theory stayed the same. Performance
followed the theory's prediction of new magnetics is all. This isn't
a mystery is it?

Care to name your speakers' model and manufacturer, or did you form
the cone and wind the voice coils around a selected magnet by hand?

73's
Richard Clark, KB7QHC


Hi Richard,

Never one to refuse a challenge.
The old speakers were a pair of Celestion Ditton 15XR's with 30 watt per
channel rating and a flat sound response output from around 20Hz to 20kHz,
104db at 1 yard driven with 1 watt. The XR stood for extended range
indicating that the speaker design had been modified and upgraded from the
original Ditton 15 specifications.
The new speakers I mentioned are a pair of Creative T20's. 14 watts per
channel from a built in amp and very nice to listen to. They don't really
compare with the Celestions for the smooth mellow sound that only seems to
come with wooden cabinets, but for the price they are excellent. Good point
about the magnets though. The super high powered magnets, ultra rigid,
lightweight fibre glass cones and developments in ported cabinet design have
all contributed to the superb performance of the T20's.

Apparently they have been out for a while now, but it was only when I was
wandering about in a PC World store that I heard a pair up and running. I
was stopped in my tracks by the sound coming out of these tiny devices and
spent a good couple of minutes looking for the subwoofer unit that I felt
sure was hidden away somewhere. There wasn't a subwoofer and after that, I
just knew I had to buy a pair.

I have no connection with Creative and in fact I am a bit annoyed with the
company's attitude to (not) providing proper sound card drivers for Windows
Vista.

Anyway, just go and check out the web reviews.

Sorry everyone else, but this bit hasn't really got anything at all to do
with antennas.

Cheers

Mike

 
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