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Old 26th November 2013, 08:48 PM   #1
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Default Dual woofer

Hi all

I am designing a pair of active speakers which will use 2x10" woofers, a single midrange and a single tweeter. The current plan is to position the drivers starting with woofer_1 at the bottom, followed by woofer_2, then the midrange and finally the tweeter at the top.

An alternative alignment which is more favourable for the power supply and amplifiers is to position the drivers starting with woofer_1 at the bottom, followed the midrange, then the tweeter and finally woofer_2 at the top.

The 'new' idea seems a little unconventional - is there anyone who knows whather it has any impact on the sound? I thought about the increased risk of lobing but as the woofers will not exceed 280Hz (and the won't be more than about 0,6m apart), that shoudn't be a problem.

Glad for any feedback!
Mark
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Old 26th November 2013, 09:52 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

You end up with a much taller cabinet with the mid and
tweeter near ear level. FWIW that would smooth driving
the rooms bass vertical mode, but for most its very fugly.

rds, sreten.
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Old 26th November 2013, 11:46 PM   #3
OllBoll is offline OllBoll  Sweden
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If you mount them WMTW or WWMT then basically nothing except increased output as long as they are close enough. If the woofers are far enough apart in the WMTW then there might be lobing where there wouldn't be in the WWMT.

If you invert one of the drivers you will significantly reduce even order distortion ( which is very nice in the bass where the copper sleeves and such doesn't do much ).

If you align them in a push-pull config you will get the drivers vibration to cancel which is also very nice, also here especially in the bass since the vibrations are so great.

Both of those setups can be done at the same time.

Last edited by OllBoll; 26th November 2013 at 11:48 PM.
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Old 27th November 2013, 12:47 AM   #4
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Quote:
Originally Posted by OllBoll View Post
If you invert one of the drivers you will significantly reduce even order distortion ( which is very nice in the bass where the copper sleeves and such doesn't do much ).
Depends on how good the woofers are. What does this do to 3rd order products, do they go up -- if they increase (or stay the same) to greater than the reduced 2nd that might not be so good.

Anytime one can go push-push with woofers it is a good idea IMO.

dave
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