On Mon, 05 Jan 2004 21:38:57 +0000, Don Pearce
wrote:

On Mon, 5 Jan 2004 19:56:51 +0000 (UTC), (Stewart
Pinkerton) wrote:

On Mon, 5 Jan 2004 17:49:06 +0000 (UTC), "David"
wrote:

To Tim and Jim

Hi guys - Can't agree about subs - even when supposedly "properly set up"
Maybe I'm just sensitive to the mush which they put out but they strike me
as this years "graphic equaliser" and the sooner they fall out of fashion
again, the better.

Properly done, they most certainly do not put out 'mush', but I'll
agree that 90% of the subs on the market are garbage. The interesting
thing is that this is the one area in audio where you really can do a
better job with DIY than you can buy at any price!

Apropos of which, thanks for recommending the Tempest. I've had a
discourse with the technical chaps at Adire, and between us we came to
the conclusion that one of those in my big brick cupboard, implemented
as infinite baffle (which it approaches pretty closely) will give me,
with room gain, a flat response down to about 12Hz. Of course with a
total lack of any kind of tuned ports, the phase response and hence
perceived speed will be just great. I'm currently building the
mounting panel that will replace the door. Reports will follow...

Apropos of that, download the Tempest white paper to get full T/S
specs, and check out what happens when you use the 'shorted coil'
option. I make it flat to 20Hz *anechoic*, with f10 at 10-11 Hz, and a
250 watt plate amp is more than adequate to 'Xmax out' up to 30Hz
driving two of them in a loft-mounted manifold.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Tue, 6 Jan 2004 08:16:54 +0000 (UTC), (Stewart
Pinkerton) wrote:

Apropos of which, thanks for recommending the Tempest. I've had a
discourse with the technical chaps at Adire, and between us we came to
the conclusion that one of those in my big brick cupboard, implemented
as infinite baffle (which it approaches pretty closely) will give me,
with room gain, a flat response down to about 12Hz. Of course with a
total lack of any kind of tuned ports, the phase response and hence
perceived speed will be just great. I'm currently building the
mounting panel that will replace the door. Reports will follow...

Apropos of that, download the Tempest white paper to get full T/S
specs, and check out what happens when you use the 'shorted coil'
option. I make it flat to 20Hz *anechoic*, with f10 at 10-11 Hz, and a
250 watt plate amp is more than adequate to 'Xmax out' up to 30Hz
driving two of them in a loft-mounted manifold.

I've got the white paper, but most of the content seems to be aimed at
minimally-sized enclosures - which I suppose is reasonable for most
people. What struck me about this speaker, though, was the huge Vas
figure, which if it is true makes it a very suitable candidate for a
big IB.

I worry some about room gain though. It does rather depend on having
all the doors and windows tightly closed. Having said that, I would
rather have slightly light but well extended bass than all the slap,
boom and thud you hear from so many subs.

d

_____________________________

http://www.pearce.uk.com

On Tue, 6 Jan 2004 08:16:54 +0000 (UTC), (Stewart
Pinkerton) wrote:

Apropos of which, thanks for recommending the Tempest. I've had a
discourse with the technical chaps at Adire, and between us we came to
the conclusion that one of those in my big brick cupboard, implemented
as infinite baffle (which it approaches pretty closely) will give me,
with room gain, a flat response down to about 12Hz. Of course with a
total lack of any kind of tuned ports, the phase response and hence
perceived speed will be just great. I'm currently building the
mounting panel that will replace the door. Reports will follow...

Apropos of that, download the Tempest white paper to get full T/S
specs, and check out what happens when you use the 'shorted coil'
option. I make it flat to 20Hz *anechoic*, with f10 at 10-11 Hz, and a
250 watt plate amp is more than adequate to 'Xmax out' up to 30Hz
driving two of them in a loft-mounted manifold.

I've got the white paper, but most of the content seems to be aimed at
minimally-sized enclosures - which I suppose is reasonable for most
people. What struck me about this speaker, though, was the huge Vas
figure, which if it is true makes it a very suitable candidate for a
big IB.

I worry some about room gain though. It does rather depend on having
all the doors and windows tightly closed. Having said that, I would
rather have slightly light but well extended bass than all the slap,
boom and thud you hear from so many subs.

d

_____________________________

http://www.pearce.uk.com

In article , Stewart Pinkerton
wrote:


Properly done, they most certainly do not put out 'mush', but I'll agree
that 90% of the subs on the market are garbage. The interesting thing is
that this is the one area in audio where you really can do a better job
with DIY than you can buy at any price!

Depends who is doing the 'DIY'. My mechanical abilities are such that every
prototype amp. etc, I make tends to make a 'swish' noise when you tllt the
box and the components slide about. :-) I suspect any sub I made would
rattle like a box of loose bolts. :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

In article , Stewart Pinkerton
wrote:


Properly done, they most certainly do not put out 'mush', but I'll agree
that 90% of the subs on the market are garbage. The interesting thing is
that this is the one area in audio where you really can do a better job
with DIY than you can buy at any price!

Depends who is doing the 'DIY'. My mechanical abilities are such that every
prototype amp. etc, I make tends to make a 'swish' noise when you tllt the
box and the components slide about. :-) I suspect any sub I made would
rattle like a box of loose bolts. :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html