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Old 21st September 2005, 03:34 PM   #1
djbdjs is offline djbdjs  Australia
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Default building a subwoofer with what i have

Hi I'm a mobile Dj,

first of all i know jack about all this.

I use a behringer europower ep1500 amp with two behringer 200watt b1520 loud speakers.... but.. i want more bass... i'm 40% deaf (natural Causes).... i like to feel the music

i have 6 cw2136 speaker drivers lying around the house.....
i bought them 8 years ago... they are 8 inch 120rms woofers response cat:CW2136 and i want to make a subwoofer..
with still 8 ohms impedence.. 4 of these drivers are still in boxes.

I made subwoofers with two of them, eight years ago from a guide in the elctronics australia magzine. And i bought another four drivers the same... but i never got around to using any of them them.... i only started to use the two subs i made a year ago in my lounge for my cinema... shakes the room.. great bass..

so... what is the best set up? i want bass, bass and more bass.
I have subwoofer crossovers..... i have tweeters and i have mid range drivers. i can buy a pezzo horn driver if need be... but i just want to use these damn drivers for something..

I don't totally understand all this stuff but the amp is 2x700 watts.
I don't even understand the make up of a sub.. the ones i made the driver faced the floor....

is adding 6 120 wrms 8ohm woofers in a parallel or circuit ever going to work?

i did a search on this sight and didn't find much. please help.

something like the behringer bb410 except with 8" woofers

regards

Dale
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Old 21st September 2005, 04:24 PM   #2
tade is offline tade  United States
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maybe a huge vented box for the couch to sit on? That would give you tons of volume, and the couch could provide mass and damping, and the vibrations would travel to your rump quite well. I would download and mess around with winisd, and try to tune the monster for a peak around 28-30hz. if i recall correctly your chest cavity resonates somewhere in there, that could make for some fun!
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Old 21st September 2005, 10:21 PM   #3
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Default T/S parameters

from the Jaycar website:

200mm driver

.Specifications-
Nom impedance: 8ohms-
Power handling: 120watts RMS-
Frequency range: 39Hz - 3500Hz-
Sensitivity: 90dB 1watt 1metre-
Voice Coil Resistance (Re): 6.9ohms-
Resonant frequency: (fs)39.9Hz-
Mechanical Q factor (Qms): 6.623
Electrical Q factor (Qes): 0.506-
Total Q factor (Qts): 0.470
Equivalent Volume (Vas): 32.8Lt-
Cone Area (square metres): 0.0214

Typical Applications
Vented Box- Box volume (litres): 33Lt- Tuning Freq (Hz): 39Hz- - 3db Frequency (Hz): 38.3Hz-
Two Vent Options:Vent dia: 66mm Length: 160mm
Vent dia : 50mm Length: 80mm-
Inside Cabinet DimensionsW 257mm; D 323mm; H 407mm

Sealed Box- Box Volume (litres): 26.9Lt- Tuning Freq (Hz): 58.1- - 3db Freq (Hz): 58.7- Qtc: 0.707- Inside Cabinet Dimensions W 237mm; D297mm; H 337mm.-

Speaker dimensions: OD(A) 210- Mounting holesB 198mm , Cutout C 184mm

For max bass, go with a vented box,
but for high power use a larger speaker would survive longer...
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Old 21st September 2005, 10:34 PM   #4
rjb is offline rjb  New Zealand
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A set of two speakers in parallel gives 4 ohms impedance.
Then put wo sets in series to give the eight ohms you specified.

Total of 4 speakers gives 120 x 4 watts = 480 watts.

Note the post above gives box size for one speaker. Muliply by four gives an indication of what you would need for four speakers.

You could use isobarik mounting to reduce size of box. Refer Win ISD-pro

But why the requirement for eight ohms?
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Old 21st September 2005, 10:37 PM   #5
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Default not really subs

Above cab volumes are for 1 speaker, multiply by the number of drivers you're going to use per cabinet

of course these aren't really subs, going down to 39Hz, but should be adequate for most music;

and you can't wire up 6 to get 8 ohms,

3 in series per side will give you 12 ohms, which will cut down available power (but probably save the speakers)
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Old 21st September 2005, 11:04 PM   #6
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Default sealed

actually, I have a couple of drivers with fairly similar t/s parameters, they work very well in seal boxes, but you'd need some eq to boost the low end
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Old 22nd September 2005, 03:32 AM   #7
djbdjs is offline djbdjs  Australia
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Default Thanks guys i'll get onto it

Thanks guys i'll get onto it... I might just use four and make a box to suit... it needs to be portable to do giggs..

My wife won't let me convert the couch..... But when i build my next house (i'm an architect) i'll build my cinema with earth shake'n subs... fixed to a rised floating concrete slab floor..... forget the couch.... howz that.. can't touch the couch but can do the house.

might be an idea to use 6 in 12ohm.... like you said it saves the drivers..

looks like i've got work to do..

What about horn tweeters.. subs of this size always seam to have them.. is this for sub releif from sound spikes etc?

Dale
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Old 22nd September 2005, 04:05 AM   #8
tade is offline tade  United States
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the tweeters are there for playing high frequency parts. Your subs may only go up to 1khz and probably unacceptably so. so if you want these speakers to play all your music, you'd need them.
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Old 22nd September 2005, 09:52 AM   #9
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Quote:
it needs to be portable to do giggs..
Small giggs ?

Mvg Johan
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Old 22nd September 2005, 12:05 PM   #10
djbdjs is offline djbdjs  Australia
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Default will it worK

Rademakers: Mobile DJ

100 - 150 people tops... eventually i'll get another berhringer amp and two more b1520 and two berhringer x1800 subs i'll need to trade the station wagon with the mini van..

I find these speaker B1520 don't have enough thump.

but right now i just want a little more 'DOOOOFF!!'

do you think it'll work or be a waste of time?

Dale
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