"TonyL"

If I started this project would there be any benefit in placing two
drivers in one enclosure and on opposite sides?


** The same outcome as any other arrangement using two drivers in the one
box - means the box has to have twice the volume.

There * IS * a benefit to be had using two, low cost woofers by mounting
them face to face and connecting the terminals out of phase. The combined
unit has the same resonant frequency but twice the cone mass with the same
cone area, twice the power handling and usually much better linearity that
one woofer does. The box can be half the volume too.

This idea is known as " push pull" or "Isobaric".


..... Phil

In article , Phil Allison
scribeth thus

"TonyL"

If I started this project would there be any benefit in placing two
drivers in one enclosure and on opposite sides?


** The same outcome as any other arrangement using two drivers in the one
box - means the box has to have twice the volume.

There * IS * a benefit to be had using two, low cost woofers by mounting
them face to face and connecting the terminals out of phase. The combined
unit has the same resonant frequency but twice the cone mass with the same
cone area, twice the power handling and usually much better linearity that
one woofer does. The box can be half the volume too.

This idea is known as " push pull" or "Isobaric".


.... Phil





Presume that was where the Linn Isobarik was derived from?..
--
Tony Sayer

Phil Allison wrote

There * IS * a benefit to be had using two, low cost woofers by
mounting them face to face and connecting the terminals out of
phase. The combined unit has the same resonant frequency but twice
the cone mass with the same cone area, twice the power handling and
usually much better linearity that one woofer does. The box can be
half the volume too.

This idea is known as " push pull" or "Isobaric".


.... Phil


Thanks Phil, just looked it up. Seems like a good way to 'use up' my two
drivers.

"TonyL"
Phil Allison

There * IS * a benefit to be had using two, low cost woofers by
mounting them face to face and connecting the terminals out of
phase. The combined unit has the same resonant frequency but twice
the cone mass with the same cone area, twice the power handling and
usually much better linearity that one woofer does. The box can be
half the volume too.

This idea is known as " push pull" or "Isobaric".


Thanks Phil, just looked it up. Seems like a good way to 'use up' my two
drivers.


** You should download WinISD and try it - it is just sooooooo simple to
use.

http://www.linearteam.dk/default.aspx?pageid=winisd

There is a large library of various brand woofers included so you can
immediately use the supplied TS data.

Also, and most importantly, you can vary box volumes and tuning points at
whim and instantly see what the effect is.

In most cases, major reductions in box volume are possible with only small
penalties in flatness and LF cut off points.



...... Phil

Phil Allison wrote:
"TonyL"
Phil Allison

There * IS * a benefit to be had using two, low cost woofers by
mounting them face to face and connecting the terminals out of
phase. The combined unit has the same resonant frequency but twice
the cone mass with the same cone area, twice the power handling and
usually much better linearity that one woofer does. The box can be
half the volume too.

This idea is known as " push pull" or "Isobaric".


Thanks Phil, just looked it up. Seems like a good way to 'use up' my
two drivers.


** You should download WinISD and try it - it is just sooooooo
simple to use.

http://www.linearteam.dk/default.aspx?pageid=winisd

There is a large library of various brand woofers included so you can
immediately use the supplied TS data.

Also, and most importantly, you can vary box volumes and tuning
points at whim and instantly see what the effect is.

In most cases, major reductions in box volume are possible with only
small penalties in flatness and LF cut off points.



..... Phil

Just a heads up....I did find the TS data for my pair of Skytronic bass
drivers online and am looking at various WinISD box designs. According to
WinISD an 'optimum' isobaric+vented design is a mere 122.5 l which is
smaller than I expected.

On 28/04/2012 19:01, TonyL wrote:


Just a heads up....I did find the TS data for my pair of Skytronic bass
drivers online and am looking at various WinISD box designs. According to
WinISD an 'optimum' isobaric+vented design is a mere 122.5 l which is
smaller than I expected.

That seems quite high. Do you get 225l for a single driver?
An isobarik box should be half the volume of that for a single driver.

--
Eiron.

On 01/05/2012 11:23, Eiron wrote:
On 28/04/2012 19:01, TonyL wrote:


Just a heads up....I did find the TS data for my pair of Skytronic bass
drivers online and am looking at various WinISD box designs. According to
WinISD an 'optimum' isobaric+vented design is a mere 122.5 l which is
smaller than I expected.

That seems quite high. Do you get 225l for a single driver?
An isobarik box should be half the volume of that for a single driver.

Oops That should be 245l. Must be going senile!

--
Eiron.