Adding subwoofer to mobile disco, help please - diyAudio
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Old 1st December 2009, 03:25 PM   #1
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Default Adding subwoofer to mobile disco, help please

Hi,
I am a mobile DJ, and I use 2 JBL eon15's. Sometimes I am in larger venues that dont have neighbours, and I'd like more bass.

I have a spare amplifier that is rated at 1000W RMS bridged into 8 ohms.

I was thinking of getting something like this...

Brooke 118X-PRO 18" Sub Bass Bin Woofer / Speaker 18" on eBay (end time 17-Dec-09 20:07:20 GMT)

Specifications (for when that ebay ad disappears)
Impedance

Power 700 Watts RMS

Frequency 33Hz to 150Hz

Sensitivity 99dB

SPL 99dB

Driver(s) One 18" Bass

Input Connection(s) 2 x Speakon® Sockets

Mounting Floor Standing

Enclosure Black 18mm Ply

Dimensions H 650mm x W 550mm x D 600mm
Weight 45kg


Would this be suitable for my needs?. I would intend to use 2 amplifiers. Would I need a high pass filter between my mixer and the amp for JBLs + a low pass filter between the mixer and the amp for the subwoofer, so that there is no destructive interference?. Would I be better driving the JBLs with the full range, and the subwoofer with just the lower frequencies?.


Any input appreciated.
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Old 1st December 2009, 04:02 PM   #2
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Definately cross the JBLs over.

I'd look for something that doesn't go much lower than 40Hz (or cross it over there). Below this frequency, displacement requirements become huge, meaning lots of big subs (not easy to carry, or cheap).

You'll definately need something like that though.
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Old 2nd December 2009, 03:26 PM   #3
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Hi wheatgerm,

This is a DIY site. Are you planning to build them yourself?
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Old 2nd December 2009, 07:33 PM   #4
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Quote:
Originally Posted by Cal Weldon View Post
This is a DIY site. Are you planning to build them yourself?
Oh, that's why I felt trapped and unable to respond.
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Old 2nd December 2009, 10:26 PM   #5
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by Cal Weldon View Post
This is a DIY site. Are you planning to build them yourself?
Most of the time DJ's are the one insisting that they want to build their own speakers/amps, and then all the audio 'pros' out there try to talk them OUT of doing it.
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Old 3rd December 2009, 01:08 AM   #6
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I wouldn't talk him out of it. Speakers aren't that hard to build. The trick is knowing how to apply the T/S params to make a valid simulation of what to expect... and having a good feel for what the numbers and charts mean in real life.
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Old 3rd December 2009, 08:08 PM   #7
Xoc1 is offline Xoc1  United Kingdom
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The speaker that you have chosen is just a simple bass reflex cabinet.
The size is about 200 litres which is what you might expect for a 18" speaker box.
A reflex box is reasonably easy to construct, if you have the resources. You could just save yourself some money and end up with a better result.
There are a couple of bass reflex designs on Fanes website. A single Fane 18 XB 800w AES driver would suit your 1000W amp. The speaker driver can be found for £150 on ebay.
If You feel even more adventurous you could check out some of the proven bandpass designs on Speakerplans.com
Speakerplans.com
These speakers are bigger, more expensive, and complicated to build, But have the advantage of being approximately twice as loud for the same input power!
You would need a active crossover for your PA system.
A Beheringer CX2310 would be adequate, or the CX3400 which has the added advantage of built in limiters.
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Old 5th December 2009, 01:39 AM   #8
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