box size for 13" w7??.. The one I built is no good - diyAudio
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Old 29th January 2006, 08:11 AM   #1
Stupify is offline Stupify  United States
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Default box size for 13" w7??.. The one I built is no good

built a 2.8 cu ft sealed box to use with my HT system and it doesn't sound right. Not very loud. Amp is a Behringer 2500. So its getting plenty of power. The xover is a behringer ultradrive 2496.

I have no clue on what size to make the new box. This box for sure isn't right because the sub doesn't get loud, or sound good. Sub isn't blown and works fine just doesn't get deep etc like a 13" w7 does.

Please help

Thanks.
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Old 29th January 2006, 02:08 PM   #2
Stocker is offline Stocker  United States
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If you are comparing this to the way it sounds in a car, prepare to be absolutely disappointed. Car subs can be used in the home, but the boxes will usually have to be much larger, and low-end extension as well as overall output will be drastically resuced.

Sorry.
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Old 29th January 2006, 07:33 PM   #3
Vigier is offline Vigier  Netherlands
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Bassreflex: 155 liter, 2x port of 10cm diameter, 57.3cm long. This will give you a 19 Hz -3dB

Sealed: 69.8 liter, 39Hz -3dB. That's not a serious subwoofer for HT use.

Your box gives a 38.5 Hz -3 dB. Indeed: that won't impress. If you want it for your HT, use a sealed box with active correction, or go for ported.
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Old 30th January 2006, 01:42 AM   #4
simon5 is offline simon5  Canada
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Vigier you got your port length wrong.

But Vigier is right, go ported or with passive radiators to unleash the true power of your beast.
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Old 30th January 2006, 02:21 AM   #5
Stupify is offline Stupify  United States
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so if I go ported it would be a lot better?
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Old 30th January 2006, 03:22 AM   #6
simon5 is offline simon5  Canada
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Yeah sure, you'll gain around 10 dB at 20 Hz, so about twice the loudness for your ears.

It also depends on how much space you can give to that box.
More space = more lower bass.

For a huge excursion driver like yours, I would suggest going with passive radiators if you have some money left. Fitting ports long enough and large enough to keep the noise down is hard.

BTW you said it's not loud enough with 1200W ? It should be very loud, but not go that low. The gains are high enough?
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Old 30th January 2006, 03:30 AM   #7
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Stupify,

Where do you have this woofer in your room?
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Old 30th January 2006, 03:32 AM   #8
Stupify is offline Stupify  United States
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well the behringer does 1200 watts per channel at 2 ohm and 750 watts at 4 ohm. So I'm guessing it should be getting around 1k watts or so. The sub is at a good friends house at the moment. But its not moving like a w7 should. The gain is up till it starts to clip and thats about half.

I don't know if the amp doesn't like 3 ohm or what. This is the first time I've used the amp. My friend has a brahma he was going to free air off the amp to see if the amp isn't working correctly.

I don't know if I should just use the w7 for my car or just sell it and get something different.
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Old 30th January 2006, 03:34 AM   #9
Stupify is offline Stupify  United States
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Quote:
Originally posted by Cal Weldon
Stupify,

Where do you have this woofer in your room?

front right part of the room
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Old 30th January 2006, 04:03 AM   #10
simon5 is offline simon5  Canada
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Put the box in a corner to see if it's loud enough.

I mean, with techno/rap and such, it should be loud enough, you should get the chest punching bass.

If it's really the deep bass you're missing, then going ported or with passive radiators will correct the problem.

Your amplifier is more than enough if it's working correctly.

Maybe check the coils to be sure they are in series and in-phase.
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