Dual woofer box

[Drummer 35]

Hi!

Im going to build a box with dual woofers. They will be the same model and will be running in parallel sharing xover.

My question is if I should share the box volume for the 2 drivers or if I should divide the volume into two half boxes for each driver.

I thought I should put both in the same box but I have seen other designs using split box so dont know if im in the right way.

Thanks!

 

[Keruskerfuerst]

If you put the two woofers in the same cabinet, then the cabinet must have the double size compared to a single woofer/cabinet.

 

[Drummer 35]

Kerus, of course. I know that.

My question is if I should build a 50 liters box for both woofers or split it in two 25 liters boxes.

 

[scottjoplin]

This might interest you Push Push Bass design

 

[globalplayer]

I would put each one in a separate enclosure. If one fails "1/2" of the enclosure will still be usable. Also parameter tolerances won`t matter as much. And the enclosure will be more stable.

 

[Drummer 35]

Scott, thanks for the link. Anyway its talking about push-pull or push-push configs.

Globalplayer, what you said is helpful for a PA speaker, so you can continue the gig with only one driver but I am looking for good sound, and dont know the advantages for each config.

Thanks for your help.

 

[scottjoplin]

That's right, it would work just as well at lower frequencies depending on where your crossover is, and you get zero cabinet vibration

 

[GM]

Globalplayer, what you said is helpful for a PA speaker, so you can continue the gig with only one driver but I am looking for good sound, and dont know the advantages for each config.

Not only that, but if you're set up to swap out blown drivers during the concert and don't have 'close enough' matching specs, then you run the risk of one driver 'hogging' most of the power with little/no box loading pressure to protect it.

No clue if this is a potential problem nowadays, but back in the early days of the amp power 'wars' this was a major problem since all multiple driver cabs were just common vent cabs plus they might drop in whatever bolted up regardless of brand, model.

Regardless, if for HIFI/HT it can sometimes be beneficial to tune each driver differently and even different to it if more channels is used due to room acoustics, kind of like a more finely tuned version of Dr. Geddes multiple sub system that can require sealed, vented, BP4, BP6, etc., in a given room/app.

If nothing else, the divider board makes for the beginning of a much stiffer cab.

GM

 

[Fernando R]

Here is some interesting reading.
Zaph|Audio

 

[MJ Dijkstra]

While it should not matter much as long as both units are working properly, a physical separation may also lower the chance of standing waves within the enclosure as these standing waves are pushed to higher frequencies in smaller enclosures (and i guess they are bass speakers)

 

[Drummer 35]

After some reading, I see mixed opinions, so I think I should make an effort and try both.

You are right about the reinforcement that the divider provides. I could make a holed divider to keep it strong, but sharing box volume, and other with no holes.

Will make some tests for each and come back.

Thanks a lot for your help guys

 

[Andre Vergison]

Will make some tests for each and come back.

Hi Drummer 35, any results thus far?



Thanks,
Andre