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Old 15th July 2013, 02:39 PM   #1
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Default Need Advice - Ghettoblaster with single woofer

My goal is to build a highly transportable and loud ghettoblaster. I have never build something like this before, so i need some advices.

The design
Click the image to open in full size.
The volume is about 6 liter.

Amplifier - TA2024 2x15 watt from Sure Electronics

Tweeter - Monacor MPT 005 (92 dB)

Woofer - Eminence Alphalite 6A (92 dB)

Battery - 12v LiFePO4 7,5 Ah

Woofer = 1 kg
Tweeter = 0,060 kg
Battery = 1,1 kg
Amplifier = 0,084 kg
Plywood = ?

Click the image to open in full size.

Does it look OK?
If i want to make it stereo by adding another tweeter (so I get 2 twetters and 1 woofer) can i do that with the same amplifier?

Last edited by magnus h; 18th July 2013 at 08:37 AM. Reason: added details
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Old 17th July 2013, 06:38 PM   #2
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I have updated the post with a illustration showing the design and added with drivers I think might work. I hope to get some feedback.
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Old 17th July 2013, 06:57 PM   #3
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Join Date: Jan 2004
Location: British Columbia
By transportable does that also mean battery powered?
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
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Old 17th July 2013, 11:06 PM   #4
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Originally Posted by Cal Weldon View Post
By transportable does that also mean battery powered?
Yes i think i will try to go with lit-ion batteries from e-bay
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Old 20th July 2013, 11:39 AM   #5
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I got the thread moved from another section of the forum and I hope to get some response on whether the tweeter and woofer will fit together and if the volume 6 liter (203 oz) is enough. I am not quite sure what to look for in WinISD but from reading the Boominator thread I have tried to boost frequencies from 100 Hz and up.
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Old 20th July 2013, 10:21 PM   #6
jwmbro is offline jwmbro  United States
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Location: München, Bavaria, Germany
I have some Eminence Alpha 6A's (almost the same as the alphalite, except the magnet) and I do think they call for a somewhat larger enclosure than 6l, I'd be looking to use more like 10l internal volume, should get you to a bit under 100Hz. But beware of the baffle step, you lose 6dB efficiency below the baffle step frequency because the sound starts radiating towards the back too.

Good loud playing midwoofers though, I use two of them in parallel, hornloaded and bass reflex with the 2x25 from sure, with currently 12xAA batteries, but still shopping around for a good rechargeable setup that doesn't have too extreme voltage fluctuations. Only just got mine built, so I don't have any more data than that yet unfortunately.

Oh, for your plywood weight question, it's usually around 500kg/m^3 for baltic birch or similar plywood, so 6kg/m^2 if you use 12mm ply like I do. Because of these 6kg of wood I used, I decided that 1.9kg vs 1kg for the alphalite was not worth the 20€ extra.
Regards, James
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Old 22nd July 2013, 12:23 PM   #7
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Thanks for the reply! I will build it to have a volume of 10 liter, and will post the result when it is finished somewhere mid August.
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