"Stewart Pinkerton" wrote in message
...
On 27 Jul 2003 22:40:31 GMT, "All Ears" wrote:

"Stewart Pinkerton" wrote in message
...
On 27 Jul 2003 17:39:35 GMT, "All Ears" wrote:

"Stewart Pinkerton" wrote in message
...

Speakers are designed to respond
linearly to a constant voltage input, and most modern speakers
assume
drive by a constant voltage source, i.e. an amp with very low output
impedance and high reserves of current. This is a fair description
of
a good SS amp, but not at all of a tubed OTL amp, which can have
several *ohms* output impedance.

So Ohms law does not apply to speakers, interesting....

Ohm's Law certainly does apply. I suggest that you read up on it.

The actual force, that the motor of the driver produces, depends on the
current induced into the coil, right? Does normal speakers have a totally
flat impedance curve? Assuming that the voltage is kept constant, and the
inpedance changes, will this not give an unlinear current, which results
in
amplitude variations over the band? (Rehercing Ohms law

Your first statement is correct. Almost all commercially available
'hi-fi' speakers have a very non-flat impedance curve. Such speakers
are however designed to have a flat amplitude response with constant
*voltage* input. This does indeed lead to some pretty wild variations
in current, but these are indications of varying efficiency, not
varying amplitude.

Yes, this is of course one of the challanges in serious speaker design.

I will compare the OTLs to a set of SS current amplifiers next week, this
will be interesting.

Good. Be sure to match levels at the speaker terminals, and to do the
test under double-blind protocols, for best results.

Sure
--

Stewart Pinkerton | Music is Art - Audio is Engineering