Convert speaker spikes from quadrupod to tripod
 

Scott Dorsey wrote:

Laurence Payne wrote:

In the second case, why spikes? Why not just the rubber pad?

You want to minimize the area of contact with the pad. Plenty of more
efficient ways to do that than spikes, mind you, but spikes are usually
what people have handy.

I've thought that the minimal contact area was important but the
smaller you go the higher the pressure so do things remain the
same ?

Paul P

Convert speaker spikes from quadrupod to tripod
 

"David Looser" wrote ...
"Scott Dorsey" wrote...
When stereo came in, corner horns went away.

It wasn't a horn, it was a bass-reflex.

If you had ever seen one, you would know better.

Paul Klipsch was (is?) famous for his corner horns.

"The Klipschorn is the only speaker in the world that has been
in continuous production, relatively unchanged, for over 60 years."
http://en.wikipedia.org/wiki/Paul_W_Klipsch

But the most impressive corner horn demo I saw was the Cerwin-
Vega room at an AES convention in LA in the 1970s. They had
an "M" cabinet which looked like a largish column speaker. But
when positioned just right facing into the corner, it would flap your
pants legs at 20 ft. This page has a drawing of the appliation...
http://www.in70mm.com/news/2007/sens...ance/index.htm
at the bottom of the page.

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. And other rumors that the JBL demos
in another room down the hall, were reproducing such realistic
gunshot sounds (thanks to their 075 ring radiator tweeters, aka.
the "acoustic laser") that the LAPD was called out to investigate.

Convert speaker spikes from quadrupod to tripod
 

"Keith G" wrote ...
"Laurence Payne"wrote ...
"Brian Gaff"wrote:
I think the reason for four was health and safety actually, harder to
wobble them over.

By audiophile reasoning, would just ONE spike, perfectly balanced, be
the ideal? :-)

What do you mean by 'audiophile'...???

Perhaps he misspelled "audiophool".

Convert speaker spikes from quadrupod to tripod
 

Scott Dorsey wrote:

David Looser wrote:

When stereo came in, corner horns went away.

It wasn't a horn, it was a bass-reflex.

There's a lot less benefit in putting a bass-reflex design in a
corner, but you do still get that edge effect and the matter of
consistency.

Ime it is about the same 8 dB and they are worth having because the boost
from a corner is the smoothest available, also it fits a traditional tone
control very well and it is easy to get some degree of perceived
linearisation. With my current 4 way it is just a matter of overall bass
unit(s) drive level to get a reasonable tonal balance.

--scott

Kind regards

Peter Larsen

Convert speaker spikes from quadrupod to tripod
 

"Laurence Payne" wrote ...
Reading at face value, that reply states that spikes either couple or
decouple the speaker from what it's standing on. Depending on which
you WANTED them to do.

This can't be right. What DID you mean?

Like many audiophool gimmics, it does what you *want* it to do.
It doesn't have to abide by the laws of physics (or economics or
common sense). That's the beauty of it.

Convert speaker spikes from quadrupod to tripod
 

"Richard Crowley" wrote in message
...
"David Looser" wrote ...
"Scott Dorsey" wrote...
When stereo came in, corner horns went away.

It wasn't a horn, it was a bass-reflex.

If you had ever seen one, you would know better.


Did you bother to read the thread before posting that response? I thought
not.

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

David.

Convert speaker spikes from quadrupod to tripod
 

James wrote:

My speakers have four spikes beneath them which makes it
a pain to
move the speakers even slightly as the length of at least
one spike
has to be adjusted to make all four rest on/in the floor.
(The floor
is solid - maybe concrete - and not wood.)


Anyone heard of a kit to convert four spikes to three? It
would have
to fit beneath the existing arrangement as I don't want
to modify the
speakers (which are Dynaudio Audience 62 floorstanders).


I'm thinking of something like a heavy duty plate with
four solid
fittings above and three below. I suppose an alteration
to the sound
is inevitable but would avoid scrap the idea if it has
too much
effect.


An alternative is to put paving slabs on top of the
carpet beneath the
speakers. They should be heavy enough to not move and
also present a
more uniform surface for the speakers though even that
would not be
perfect. The slight problem here is the slabs sold by the
local stores
are fairly lightweight.

Why don't chairs have three legs?

Tractors had three legs and they fell over easily. Maybe
they still do.

If you must use a tripod, put the single leg at the back,
otherwise the speaker will tip over if you brake mid-corner.
You can race a Morgan, but not a Reliant, unless you're
daft. At least when it falls over the chances are that it'll
be driver-side up, so a cone won't get spiked by the corner
of the coffee table.

If you had a four-to-three adaptor platform, then every time
you moved a speaker, you would need to lift it off its
platform, then move the platform, then lift the speaker back
onto it. That would surely take just as much time and effort
as adjusting a leg?

A flat stone could be more or less wobbly than four
imperfectly adjusted legs unless it's a lot wider, in which
case it might still be a bit wobbly and someone's bound to
trip and/or stub a toe on it, to boot, especially if you
keep moving it around. Anyway, if it's big and heavy then
it's hard to move, so how's that easier than adjusting a leg
or two?

If your floor is lumpy and you use a tripod, the chances are
that your speakers won't be upright.

You should put up with the need for adjustment.
Manufacturers of speakers (and cars) have generally found
the best compromise.

OTOH, perhaps an adaptor platform would make a plausible
audiophool accessory?

Ian

Convert speaker spikes from quadrupod to tripod
 

David Looser wrote:
"Scott Dorsey" wrote in message
David Looser wrote:

When stereo came in, corner horns went away.

It wasn't a horn, it was a bass-reflex.

There's a lot less benefit in putting a bass-reflex design in a corner,
but you do still get that edge effect and the matter of consistency.

I don't buy this "consistency" notion. There are still far too many
diferences: room size, furnishings and building construction. And that's
before we think about differences in the speakers themselves: driver types
and sizes, materials used, construction techniques etc.

Yup, that's true, but the number one thing that determines the low end
response (outside of the loudspeaker itself) is the boundary effect.
The corner horn controls that.

Now, things like standing waves in the room are still very, very significant
and corner placement doesn't do anything to reduce that; if anything it can
actually make some modes worse.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Convert speaker spikes from quadrupod to tripod
 

In article ,
Keith G wrote:
Since it's impossible to make a totally rigid speaker cabinet some
makers take into account any 'output' from the cabinet itself. Think
the first to do this was the Spendor BC1. Which was designed to be
mounted on an open stand about 9" high. Adding mass to the cabinet -
like putting books on top - would negate the design theory.


The Rogers 'BBC Studio Monitors' I had here a while back were
'thinwall/resonating' types and sounded very good indeed,

Probably the same family as the BC1 - from an original BBC design study.

apart from the
rasping bass unit I couldn't cure - without spending a lot of money and
maybe changing the speakers characteristics too much, in any case....

I suppose you tried inverting the driver?

--
*Few women admit their age; fewer men act it.

Dave Plowman London SW
To e-mail, change noise into sound.

Convert speaker spikes from quadrupod to tripod
 

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"

There were rumors that C-W cracked some plaster and had to
pay the hotel for repairs. And other rumors that the JBL demos
in another room down the hall, were reproducing such realistic
gunshot sounds (thanks to their 075 ring radiator tweeters, aka.
the "acoustic laser") that the LAPD was called out to investigate.

Kind regards

Peter Larsen