David Looser schreef:
"GSV Three Minds in a Can" wrote in message
...
Bitstring , from the wonderful person
David Looser said
"GSV Three Minds in a Can" wrote in message
...
Sure it can. You just need something around 0.1hz.

You won't get 0.1Hz through an audio amplifier!

Who was talking about using an audio amp?

That's what this thread was about. We were talking about speaker phase, and
speakers are only ever driven by audio amplifiers!

I was musing between a frequency generator, and maybe just a battery and
switch. I did say it was a dumb idea though, since you can only test at
the terminals on the back on the speaker (unless you knock it to pieces),
and with cheap speakers they are just as likely to be mis-wired inside.

Well it IS a dumb idea, a particularly dumb idea, but not for that reason.
I've never come across mis-wired speakers and frankly I don't believe that
any factory-made speakers, even the very cheapest, would have the two
speakers of a stereo pair wired differently.

David.



Are we full circle ?

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David Looser schreef:
"Don Pearce" wrote in message
...
On Tue, 6 May 2008 10:41:03 +0100, "David Looser"
wrote:

"Don Pearce" wrote in message
...
Fan-based subwoofers will do it.

What's a "fan-based" subwoofer?, and what will they "do"?

David.

A rotating fan with variable pitch blades whose angle is modulated by
the bass signal. What they will do is reproduce 0.1Hz quite nicely.


Is this something you've just invented? because it seems utterly pointless
to me. And I don't know what you mean by "reproduce". 0.1Hz isn't "sound" by
any stretch of the imagination, it cannot be heard, and is actually too low
a frequency even to be readily sensed as movement. The only sort of device I
can imagine that will "reproduce" 0.1Hz, in the sense of doing something
that a human could detect (other than by sight), would be a moving platform.

David.
.


mr. Leslie ?

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"TheFug" wrote in message
. ..
David Looser schreef:

.. The only sort of device I
can imagine that will "reproduce" 0.1Hz, in the sense of doing something
that a human could detect (other than by sight), would be a moving
platform.

David.
.
mr. Leslie ?


No, Leslie moved the speaker, not the listener.

David.

On Sun, 11 May 2008 11:08:27 +0100, "David Looser"
wrote:

"TheFug" wrote in message
...
David Looser schreef:

. The only sort of device I
can imagine that will "reproduce" 0.1Hz, in the sense of doing something
that a human could detect (other than by sight), would be a moving
platform.

David.
.
mr. Leslie ?


No, Leslie moved the speaker, not the listener.

David.


And it couldn't produce any 0.1Hz either.

d

--
Pearce Consulting
http://www.pearce.uk.com

On Apr 29, 9:21*am, Terry Pinnell wrote:
Could someone remind me of the simple test involving placing 'left'
and 'right' speakers close together facing each other please? Am I
right in recalling that they are in correct 'phase' when the volume
sounds reduced/muffled? Or is it the reverse?


When they are in the correct phase the signal is strong, particulartly
the bass. When they are out of phase you lose the bass.

Robert