Will it ruin the great sound I have?

Marsh · 23rd June 2007, 03:59 PM

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!

RobWells · 23rd June 2007, 08:23 PM

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.

richie00boy · 23rd June 2007, 09:02 PM

Have to agree with Rob. Adding a driver to the existing enclosure will cut off bass and make it more peaky.

Marsh · 23rd June 2007, 09:53 PM

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.

RobWells · 23rd June 2007, 09:57 PM

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.

bigwill · 24th June 2007, 12:33 AM

pushing push-push

Marsh · 24th June 2007, 08:31 AM

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.

richie00boy · 24th June 2007, 09:32 AM

Sealed vs vented really depends on the specs of your driver - post them up.

Marsh · 24th June 2007, 09:59 AM

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

RobWells · 24th June 2007, 10:20 AM

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.

23rd June 2007, 03:59 PM	#1
Marsh diyAudio Member Join Date: Mar 2007	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! __________________ I learn something old every day.

23rd June 2007, 09:02 PM	#3
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Have to agree with Rob. Adding a driver to the existing enclosure will cut off bass and make it more peaky. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

24th June 2007, 08:31 AM	#7
Marsh diyAudio Member Join Date: Mar 2007	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. __________________ I learn something old every day.

24th June 2007, 09:32 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Sealed vs vented really depends on the specs of your driver - post them up. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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23rd June 2007, 08:23 PM	#2
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	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.

24th June 2007, 12:33 AM	#6
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	pushing push-push

24th June 2007, 10:20 AM	#10
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	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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