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Old 30th September 2008, 11:05 PM   #1
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Default looking for a driver for a compact DJ sub

I just bought two used 15" / 1.5" full range JBL cabinets from my speaker store and they are AMAZING. all i can think about is "now what subs do i need". As to amps i already have two behringer europower ep2500 amps that get 400 watts @ 8 ohms and 700 watts @ 4 ohms. I want one or two subs to funnel as MUCH bass out of midtops as possible. I want massive crystal clear bass to go with my massive crystal clear full rangers. The question i had about designing subs is what size driver to select. I was thinking i would like to do something sorta unusual to turn heads, so i am trying to stear away from the standard 18" stuff. I was thinking about doing a bunch of 12 or 10 inch speakers in one box. if i double size of box, double amount of speakers, but keep wattage the same, doesnt that mean i get double the spl? i was thinking of doing that to get like big spls in a small box full of small speakers. what speakers should i investegate?
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Old 3rd October 2008, 11:02 AM   #2
djk is offline djk
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"if i double size of box, double amount of speakers, but keep wattage the same, doesnt that mean i get double the spl?"

It means you get double the efficiency, 3dB more sensitivity.

"i was thinking of doing that to get like big spls in a small box "

For a given cut-off, the smaller the box, the less efficient it will be.

While it is possible to get high output out of a small box, it will cost big money for drivers and amplifier power. Beyond a certain point and you will have to start carying a 220V distro, as you won't be able to power it off a standard 120V outlet.
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Old 4th October 2008, 06:51 AM   #3
dangus is offline dangus  Canada
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Eminence Omega or Kilomax 15" in a horn or bandpass, if possible. In a vented box, two per side. On the other other hand, horns are generally better in multiples too. How much space do you have for storage and shipping?

Consider the plans at BillFitzmaurice and Speakerplans.com

The multiple driver thing has a lot going for it, but... a rough guesstimate suggests you could need 16 drivers to get the same efficiency from small-box woofers as from a typical vented-box 18" (84 dB + 12 dB -> 96 dB). Maybe for a fixed installation, and if you got a real deal on the drivers, like a palletload of 12" car subs at $20 each. If overall powerhandling was higher (even after allowing for the fictional power rating of autosound products), this could allow for some impressive low bass, since 16 drivers would pump a lot of air.
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Old 4th October 2008, 07:49 AM   #4
djk is offline djk
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So, is this the kind of bass you're looking for?

Click the image to open in full size.

This is what you get with a long horn with too small of a mouth.

"Eminence Omega or Kilomax 15"

OMEGA PRO-15A
Maximum Linear Excursion (Xmax) 4.8mm
Maximum Mechanical Limit (Xlim) 12.2mm

KILOMAX® PRO 15A
Maximum Linear Excursion (Xmax) 7.9mm
Maximum Mechanical Limit (Xlim) 13.5mm

I think I would rather use the:

DEFINIMAX™ 4015LF
Maximum Linear Excursion (Xmax) 9.0mm
Maximum Mechanical Limit (Xlim) 15.5mm

Or the:

KAPPALITE™ 3015LF
Maximum Linear Excursion (Xmax) 9.6mm
Maximum Mechanical Limit (Xlim) 17.0mm

But not in a regular horn, for the reasons shown in the graph above.
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