In article ,
Eiron wrote:
Peter Larsen wrote:
Richard Crowley wrote:

C-W were also showing a 12-inch(?) driver which they would
plug directly into the 120V power mains outlet in the hotel room.

Julian Hirsch tested it for stereo review, "the only result was a very loud
noise, no harm to the speaker"

I heard that Bose fitted a light bulb in series with the drivers
(inside the cabinet) to protect them, and to allow the 'mains demo'.
Don't know how true it is though.

The Bose 901 doesn't do the light-bulb trick (although it IS a cool trick
in some ways). However, if you do an impedance plot of the 901, you'll find
it's something like 120 ohms at 60 Hz.

This means if you actually plug it into a 120V line, you get P=V^2/R= 120
watts of power actually going into the speakers, which isn't enough to hurt
them.

That is, what you are demonstrating is mostly how inefficient the speakers
are at low frequencies.....
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"Laurence Payne" wrote in message
...
On Mon, 24 Aug 2009 17:07:49 +0100, "Keith G"
wrote:

(I remember once I got someone to listen with his eyes shut while I slowly
rotated one speaker until it was facing the wall - he had no idea what was
going on and said the sound was unaffected throughout!! ;-)

Yes, the Critical Distance for a given room/speaker combination is
often closer than you think! In PA applications sometimes it's
practically impossible to place the audience inside it.

Where's your hi-fi listening "sweet spot" in relation to the CD? In
any given room, the same for all speakers or not? When recording, I'm
used to monitoring well inside, but checking a mix from WAY outside -
like in the next room with the door shut!


In normal use I don't go for all this 'sweet spot' malarkey - I listen to
most of my music through the doorway from the next room when I'm not
listening to the setup on this computer! Anyway, a little while ago I was
prompted to make a couple of (mono) microphone recordings of the SET/Lothers
with my toyshop ribbon (haven't done it for ages) thus:

http://www.moirac.adsl24.co.uk/shown...ibbonSetup.jpg

(Note the dressing gown hanging behind it to soak up the 'backdraft'...)

Here's a couple of very dirty extracts, complete with hiss, hum, the 'needle
down' bang and even the sound of me closing the door, to give you an
approximate *recorded* idea of what I like soundwise:

http://www.moirac.adsl24.co.uk/shown...phtExtract.mp3

http://www.moirac.adsl24.co.uk/shown...htExtract2.mp3

"GregS" wrote in message
...
In article , "David Looser"
wrote:

I did see the corner speaker *I'm* talking about, which is more than you
have. And it was a bass-reflex.


OK, near the end of Speaker Builder magazine, and in Audio Express, a
fellow was putting ports
or "bass reflex" into his horns to get improved performance.

So it might be either or both.


I wonder why it is that people who have never seen the speaker I'm talking
about, indeed know nothing about it beyond what I've told them, still insist
on trying to tell me what it "might be"? This wasn't a horn with a port in
it, it was a bass-reflex, OK?

David.

"Richard Crowley" wrote in message
. ..

I did read the thread. It appears to be talking about the classic
Klipsch corner.

Actually the thread is about spikes, note the thread title. *One person*
misunderstood what I was talking about and mentioned corner horns. That
hardly makes this a thread about "the classic Klipsch corner".

You can go back and review it if you're confused.

I'm not confused - you are. Clearly, contrary to your assertion above, you
did *not* read this thread before posting!

I did see the corner speaker *I'm* talking about, which is more than
you have. And it was a bass-reflex.

I guess we don't know which corner speaker *you're* talking about,
then.
No you don't, as I told you.

David.

David Looser wrote:
"GregS" wrote in message
...
In article , "David Looser"
wrote:
I did see the corner speaker *I'm* talking about, which is more than you
have. And it was a bass-reflex.

OK, near the end of Speaker Builder magazine, and in Audio Express, a
fellow was putting ports
or "bass reflex" into his horns to get improved performance.

So it might be either or both.


I wonder why it is that people who have never seen the speaker I'm talking
about, indeed know nothing about it beyond what I've told them, still insist
on trying to tell me what it "might be"? This wasn't a horn with a port in
it, it was a bass-reflex, OK?

Maybe they thought you were talking generally about speakers in corners
rather than the specific one which your grandfather built.

--
Eiron.

"Don Pearce" wrote in message
news:4a92f6a4.1781369140@localhost
On Mon, 24 Aug 2009 15:58:04 -0400, "Arny Krueger"
wrote:

"Richard Crowley" wrote in message


C-W were also showing a 12-inch(?) driver which they
would plug directly into the 120V power mains outlet in
the hotel room.

There were rumors that C-W cracked some plaster and had
to pay the hotel for repairs.

I believe that there are a number of extant modern
woofers that can survive this treatment for at least a
little while without tricks. 120 volts is the same as
1,800 watts into 8 ohms, which is not an unbelievable
amount of power by modern standards.

On the tricks side, a woofer with a 60.0 Hz resonance
would not absorb *that* much power, given that its
impedance at 60 Hz might be as high as 30 ohms or more,
and only 4 amps (480 watts) or less would need to be
dissipated in the voice coil.

Also, a woofer with a 16 ohm voice could would need to
absorb *only* 900 watts. A mere pittance! ;-)

Mmmm.... Don't try it over here in England.

Yup - 230 volts, 50 Hz.

"Eiron" wrote

Maybe they thought you were talking generally about speakers in corners
rather than the specific one which your grandfather built.


Scott replied as though corner speakers could only be horns, fair enough if
that's the only sorts he's met. I simply pointed out that the one I was
talking about was a bass-reflex. But then Richard Crowley crashed in with
"If you had ever seen one, you would know better", clearly indicating that
he had no idea what the point of my comment had been, or indeed on the flow
of thread up to that point. Then GregS comes in with "So it might be either
or both" when it is clear from the context that "it" is the speaker I was
talking about. Yes I get ****ed-off when people tell me that I would "know
better" simply because they are incapable of following a thread!

David.

In article ,
says...
Here's a quick snap:

http://www.moirac.adsl24.co.uk/showntell/Triangular.jpg

I see we shared the same taste in upmarket equipment racks and
meticulous wiring practice.

On Mon, 24 Aug 2009 21:53:42 +0100, "Keith G"
wrote:

In normal use I don't go for all this 'sweet spot' malarkey - I listen to
most of my music through the doorway from the next room when I'm not
listening to the setup on this computer!

Oh sure, me too. Unless I'm working, I'm listening to the music not
the equipment. Or just enjoying a pleasant background noise.

But just now and again the BBC pump out something good and I fancy
wallowing in a bit of stereo image. So I need to know where the sweet
spot IS :-)

oopths

http://www.btinternet.com/~unsteadyken/mycrap.JPG