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Old 23rd June 2007, 03:59 PM   #1
Marsh is offline Marsh  United Kingdom
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Default Will it ruin the great sound I have?

What could I expect if I was to add another identical driver to my sub box. It's 77L tuned to 20Hz at the moment.
It's a DF design but I'm considering adding the other driver on the smaller vertical face/baffle.

Or

Should I build another Identical box and locate it somewhere else in my room?

Or

A bigger box (200L) and have them both DF?

The driver bottoms out when I play films REALLY loud so adding another driver seems like the best option, to me.

It's pictured here New Sub Finished Too!
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Old 23rd June 2007, 08:23 PM   #2
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Adding a driver to your existing box is not really an option.

Either build a box twice the volume (mount the drivers on opposite sides to benefit from push push vibration control)

Or build a second identical enclosure.

Personally I'd do the first option, then if it's still not got enough welly build another 2 driver enclosure for a total of 4 drivers.

Rob.
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Old 23rd June 2007, 09:02 PM   #3
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Have to agree with Rob. Adding a driver to the existing enclosure will cut off bass and make it more peaky.
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Old 23rd June 2007, 09:53 PM   #4
Marsh is offline Marsh  United Kingdom
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Quote:
Originally posted by RobWells
Adding a driver to your existing box is not really an option.

Either build a box twice the volume (mount the drivers on opposite sides to benefit from push push vibration control)

Or build a second identical enclosure.

Personally I'd do the first option, then if it's still not got enough welly build another 2 driver enclosure for a total of 4 drivers.

Rob.
I like the way you think. 4 drivers!

Thanks for the advice, I like the opposite sides idea.

Rich.
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Old 23rd June 2007, 09:57 PM   #5
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Quote:
Originally posted by Marsh


I like the opposite sides idea.

Rich.
Planet10 Daves been pushing that idea for years - I'm just quoting him.

Rob.
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Old 24th June 2007, 12:33 AM   #6
bigwill is offline bigwill  United Kingdom
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pushing push-push
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Old 24th June 2007, 08:31 AM   #7
Marsh is offline Marsh  United Kingdom
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So with a push-push configuration should the drivers be in separate chambers or share the same internal air-space?

Also, that's going to shift a mighty amount of air so would it be wise to use a large sealed box or use a couple of pretty large ports?

I prefer the ported design as it kind of eliminates the need for EQ.

Rich.
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Old 24th June 2007, 09:32 AM   #8
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Sealed vs vented really depends on the specs of your driver - post them up.
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Old 24th June 2007, 09:59 AM   #9
Marsh is offline Marsh  United Kingdom
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Quote:
Originally posted by richie00boy
Sealed vs vented really depends on the specs of your driver - post them up.

I have a pair of these: http://www.bkelec.com/HiFi/drive_uni...onolith_du.htm
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Old 24th June 2007, 10:20 AM   #10
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You've stated you prefer the ported design as it doesn't need eq, so go with that.

Do a search on push push, theres loads of good discussion on this topic.

Rob.
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