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Old 2nd July 2006, 11:33 AM   #1
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Default Bassboost for a Fullrange CB?

Hello
I'm going to build a cheap, aktive music-box for outdoor use with two 6.5" Fullrange drivers in a closed box with about 35 liters.
In the simulation I've done with a bass-speaker-programm (should work?) the -3dB point is at 82Hz and at 130Hz there is a peak of 5dB (Qts=1.2, Qtc=1.8).
Is it possible/good to make a aktive bassboost with this configuration to become a little lower bass?

..looking forward for any answers

thx Tom
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Old 2nd July 2006, 12:38 PM   #2
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Hi

www.altronics.com.au Has some diy kits for bass boosting.
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Old 3rd July 2006, 04:15 AM   #3
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I am just a rookie but wouldn't increasing the size of that box a bit tame the hump and give a little bass extension also?

mike
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Old 4th July 2006, 06:34 PM   #4
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I'm also a rookie but it will does, I think. The problem is the box should be portable ;-).

Tom
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Old 4th July 2006, 07:29 PM   #5
Nanook is offline Nanook  Canada
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Default more info..

how about some driver parameters or manufacturer and model number ?

35 litres seems like it would be large for a "portable"
I'd be tempted to build 2 seperate enclosures, perhaps both with an inexpensive plate amp or battery powered class D or T amp.

can you provide more information?
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Old 5th July 2006, 02:12 PM   #6
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Here are the driver parameters:

impedance: 8 Ohm
nom. power: 20W
SPL 1W/1m: 91dB
SPL 6W/1m: 97dB
fs: 80 Hz
Re: 7 Ohm
Le: 0.3 mH
Qms: 6
Qes: 1.6
Qts: 1.2
VAS: 22 l
Mms: 6 g
Rms: 0.5kg/s
Cms: 0.6 mm/N
B*l: 3.6 Tm
Sd: 154 cm²
weight: 0.5 kg
magnet: 5 oz
voice coil: 20 mm

It's a 6.5" fullrange driver from "Westra" called SF-180-501 (german manufacture I think). I choose that driver cause it has a high SPL and costs only 2,95 Euros.
35 liters is large for portable, that`s right (should be for camping for example). I've decided now to build only one driver (mono) with a TDA1519B in a box with 21 liters net (wood is already cutted). Together with a CDROM and two batteries the box will be 33x33x33cm (outside), that's ok for me ;-).

I've never designed a box but hope it will play "a little bit good" music.
...looking forward to any comments (hope it's enough information).

thx Tom
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Old 6th July 2006, 02:15 AM   #7
Nanook is offline Nanook  Canada
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Default something's wrong...

the numbers you have are not compartable.. there must be an error, WinISD would not load em..

where did you get the numbers and .. why such a terribly inexpensive speaker ...?
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Old 6th July 2006, 02:36 PM   #8
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The parameters are from the datasheet. I'm going to use that driver cause I'd like to build the box as cheap as possible. Of course I know that it won't be "hifi".

edit: http://www.pollin.de/shop/downloads/D640187D.PDF

thx Tom
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Old 6th July 2006, 11:37 PM   #9
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Hi Tom

I have built and use the bass boost boost module that was mentioned from altronics, I am sure it would work really well for your application, it is quite tuneable with regards to its cut in point and amount of boost .......and cheap! It only needs a single rail 12V DC supply but any supply up to 20v will work. THe only thing to watch out for is the quaity of the supply some are noisy and this will introduce some low level hum.

Oh and the sound quality is excellent!
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