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G3OYU > STEREO 08.01.03 08:53l 43 Lines 1591 Bytes #999 (0) @ WW
BID : 9D0925G3OYU
Read: GUEST
Subj: Re: More on Stereo
Path: ON0AR<ON0AR<7M3TJZ<IK6PYS<IK1ZNW<GB7CRV<GB7CIP<GB7WSX
Sent: 030108/0739Z @:GB7WSX.#32.GBR.EU #:279 [Crawley] FBB $:9D0925G3OYU
From: G3OYU@GB7WSX.#32.GBR.EU
To : STEREO@WW
KB9ALN wrote:-
> One comment involved the terminology "Watts RMS", saying that all watts
> are "Watts RMS". I'd like to elaborate on this.
>
> There are other types of watts. Peak and Peak-to-Peak come to mind.
Hi Andy
Was that a slip of the fingers by chance? I think it was my comment, but
what I actually said was the Watts are Watts, the term Watts RMS is a
non-stater it doesn't actually exist. Mathematically it can, just as you
say pk-pk Watts can, but in practice what is actually meant, as I also
said is that the correct term should be 'xyzWatts sine wave driven'. This
is unambiguous and mathematically correct.
I find that computer loudspeaker terminology the biggest laugh of all.
My present setup includes a pair of loudspeakers no more than 120mm cube
and they have a rating of 240W. I have no idea how this came about!
Further, regarding Bose, I would dearly like to know the distortion levels
of their 800 series boxes that only have 100mm drivers installed. They
claim lots of bass.
The laws of physics are quite clear. If you want to reproduce bass down
to say the open E string on a bass guitar - around 31Hz - then you must
move lots of air. There are two ways to do this, you can move a small
cone a long way, as Bose do, or you can move a large cone a small
distance.
Move a small cone a large distance and what happens? You cannot possibly
maintain the speech coil in a constant magnetic field, physically
impossible. Hence non-linear and therefore distortion results. Ugh
horrible.
73
Brian G3OYU
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