"Stewart Pinkerton" wrote in message


On Sun, 18 Jul 2004 14:54:44 +0100, Don Pearce
wrote:

On Sun, 18 Jul 2004 12:22:34 +0000 (UTC), Stewart Pinkerton
wrote:
Call that a subwoofer? Try this: http://www.klone-audio.com/

And check out '12 Shivas dancing'..................

My goodness. But how is he holding them onto the baffle? Four weedy
little spring clips... they'll be bouncing.

Nope - basic engineering. With a dipole system, there's little or no
back pressure, so there's only a very small force on the clips.

They look to me like US conduit clamps, which are made out of pretty heavy
gauge steel. The cute part is that they are springs so they are unlikely to
loosen up. But they are relatively heavy springs.

On Sun, 18 Jul 2004 18:38:51 -0400, "Arny Krueger"
wrote:

"Stewart Pinkerton" wrote in message


On Sun, 18 Jul 2004 14:54:44 +0100, Don Pearce
wrote:

On Sun, 18 Jul 2004 12:22:34 +0000 (UTC), Stewart Pinkerton
wrote:
Call that a subwoofer? Try this: http://www.klone-audio.com/

And check out '12 Shivas dancing'..................

My goodness. But how is he holding them onto the baffle? Four weedy
little spring clips... they'll be bouncing.

Nope - basic engineering. With a dipole system, there's little or no
back pressure, so there's only a very small force on the clips.

They look to me like US conduit clamps, which are made out of pretty heavy
gauge steel. The cute part is that they are springs so they are unlikely to
loosen up. But they are relatively heavy springs.

I think the question is why fix them in that way at all? The speakers
have 8 perfectly good bolt holes, that all work very nicely as far as
I am concerned.

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

On Sun, 18 Jul 2004 18:38:51 -0400, "Arny Krueger"
wrote:

"Stewart Pinkerton" wrote in message


On Sun, 18 Jul 2004 14:54:44 +0100, Don Pearce
wrote:

On Sun, 18 Jul 2004 12:22:34 +0000 (UTC), Stewart Pinkerton
wrote:
Call that a subwoofer? Try this: http://www.klone-audio.com/

And check out '12 Shivas dancing'..................

My goodness. But how is he holding them onto the baffle? Four weedy
little spring clips... they'll be bouncing.

Nope - basic engineering. With a dipole system, there's little or no
back pressure, so there's only a very small force on the clips.

They look to me like US conduit clamps, which are made out of pretty heavy
gauge steel. The cute part is that they are springs so they are unlikely to
loosen up. But they are relatively heavy springs.

In the accompanying text, it mentions that they are indeed 1/2 inch
conduit clamps. Not 'weedy little spring clips' by most standards!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Sat, 17 Jul 2004 15:00:06 +0100, Don Pearce
wrote:

As promised here is a picture of my subwoofer. I have pushed a settee
out of the way so it can be seen, and also removed a white cloth
screen that normally covers it. So in use it is totally invisible.

http://www.donepearce.plus.com/odds/sub.jpg

The driver is a 15 inch Adire Tempest mounted in an 80 cubic foot
concrete cupboard, which extends under a staircase on the other side
of the wall. The mounting board, which replaces the cupboard door, is
18mm MDF, braced extensively with scaffolding board, screwed and glued
edgewise onto it. It is very solid.

According to LSPCad as available from the Adire website, that has an
f3 of about 75 Hz, so you'll need some heavy EQ to get a flat
response. OTOH, if you ceiling mount a Tempest with one voice coil
shorted, it's ruler-flat to 20Hz..................

--

Stewart Pinkerton | Music is Art - Audio is Engineering