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Looking For An Active Subwoofer Project
Looking For An Active Subwoofer Project
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Old 31st January 2004, 09:33 AM   #1
brokenbinil is offline brokenbinil  India
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Exclamation Looking For An Active Subwoofer Project

hi guys .... this is my first thread and well i'm looking for a good active subwoofer circuit - project to construct my self. i have never made a subwoofer as of yet .. and will need some assistance. please keep in mind that i'm from india where u don't get many parts and spares easily. Binil
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Old 1st February 2004, 01:54 AM   #2
Frisbee78 is offline Frisbee78  United Kingdom
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Hi there

I have a design for an active sub filter with a range of 20Hz to 30-120Hz (adjustable upper range). I can send you it but it's written in French...

I have started building it and is nearly finished. However, I have now got hold of a sub with an inbuilt passive filter and I therefore do not need the active filter anymore... So, if you want, I could sell it to you once it's finished?
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Old 2nd February 2004, 03:08 AM   #3
brokenbinil is offline brokenbinil  India
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Smile thankx a tonne

hey thankx for the reply .... ineed ed a sub project alrite but if it is in french ... the n i'll have a tough time... i know i'm asking a lot but can u try and transalate it to english if possible. .... hey and about the active filtre ... i will decide and tell u. ok . by the way can u clear it to me what is the difference between a passive and an active filtre.
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Old 2nd February 2004, 10:13 AM   #4
Frisbee78 is offline Frisbee78  United Kingdom
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Hey there

Well all the explainations are in French but you don't really need them unless you want to know the detail of how it works.
I can get you the schematics only. They should be fairly straight forward...

An active filter (or crossover) will modify the signal before it gets to the amplifier. The main advantage is that the crossover attributes can be altered in real time and easily (in the case of my active filter, you can adjust the upper range from 30Hz to 120Hz and adjust the output volume). It is usually built with small electronic like ICs & stuff. The main drawback of this configuration is that you need an amplifier for each output of the filter. In case of an active filter for a 3 way speaker, you need 3 amps to power that speaker (6 in total for a configuration in stereo). However, in the case of a sub, we don't care because the filter has only one output. Most subs on the market use active filters.

A passive filter is placed after the amplifier thus allowing to use only one amp for a mutli way speaker. It is made with passive component like capacitors and coils. The drawback is that once the filter is made, it cannot really be adjusted. There are some ways to go around that but at the expense of some power loss. The vast majority of X-way speakers on the market use passive filters.

In the case of my passive sub, it's frequency response and cutoff frequencies are fixed. I could of course convert it to active, but I would need an amp for it. I am still not decided whether to do it or not...
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Old 2nd February 2004, 10:57 AM   #5
Doug is offline Doug  Canada
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Default Doug

Hi Banil;

There are a bunch of guys from India who post on this forum on a regular basis and might be able to help you out. If I recall, they to were having difficulty with the availability of drivers and materials to construct their owwn speaker systems. They seem to be doing OK now so maybe you will be able to network with them to find sources for what your looking for. You will find them on the thread below:

http://diyaudio.com/forums/showthrea...threadid=14058

Good Luck,

Doug

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Old 3rd February 2004, 05:38 AM   #6
brokenbinil is offline brokenbinil  India
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Default hi doug and frisbee

it's binil doug. ok.
well thanks a tonne u guys ... thx frisbee in getting my doubts cleared and doug for letting me know about other people in india. well it is tru thet getting mdf and drivers are a problem here .... and improting is out of question due to the cost here ... so here goes ... frisbee u can send me the schematics it will be of great help
Binil
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Old 4th February 2004, 01:44 PM   #7
Frisbee78 is offline Frisbee78  United Kingdom
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Binil, could you PM your email address for me send you the svhematics?
Thanks
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Old 6th February 2004, 10:40 AM   #8
brokenbinil is offline brokenbinil  India
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Quote:
Originally posted by Frisbee78
Hi there

I have a design for an active sub filter with a range of 20Hz to 30-120Hz (adjustable upper range). I can send you it but it's written in French...

I have started building it and is nearly finished. However, I have now got hold of a sub with an inbuilt passive filter and I therefore do not need the active filter anymore... So, if you want, I could sell it to you once it's finished?

hi you said u wud send the schematic s.... please do yaar .
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