Looking For An Active Subwoofer Project - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 31st January 2004, 09:33 AM   #1
diyAudio Member
 
brokenbinil's Avatar
 
Join Date: Jan 2004
Location: Jamshedpur, India
Send a message via Yahoo to brokenbinil
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
  Reply With Quote
Old 1st February 2004, 01:54 AM   #2
diyAudio Member
 
Join Date: Jan 2004
Location: Leeds, West Yorkshire
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?
  Reply With Quote
Old 2nd February 2004, 03:08 AM   #3
diyAudio Member
 
brokenbinil's Avatar
 
Join Date: Jan 2004
Location: Jamshedpur, India
Send a message via Yahoo to brokenbinil
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.
  Reply With Quote
Old 2nd February 2004, 10:13 AM   #4
diyAudio Member
 
Join Date: Jan 2004
Location: Leeds, West Yorkshire
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...
  Reply With Quote
Old 2nd February 2004, 10:57 AM   #5
Doug is offline Doug  Canada
diyAudio Member
 
Doug's Avatar
 
Join Date: Dec 2002
Location: Guelph, Ontario, Canada
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

  Reply With Quote
Old 3rd February 2004, 05:38 AM   #6
diyAudio Member
 
brokenbinil's Avatar
 
Join Date: Jan 2004
Location: Jamshedpur, India
Send a message via Yahoo to brokenbinil
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
  Reply With Quote
Old 4th February 2004, 01:44 PM   #7
diyAudio Member
 
Join Date: Jan 2004
Location: Leeds, West Yorkshire
Binil, could you PM your email address for me send you the svhematics?
Thanks
  Reply With Quote
Old 6th February 2004, 10:40 AM   #8
diyAudio Member
 
brokenbinil's Avatar
 
Join Date: Jan 2004
Location: Jamshedpur, India
Send a message via Yahoo to brokenbinil
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 .
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
active subwoofer and 2channel amp. calvin14 Parts 4 16th July 2009 04:08 PM
21" Active subwoofer project Village Plank Subwoofers 23 31st March 2009 10:20 PM
Active subwoofer Bensen Solid State 0 11th August 2003 04:18 PM


New To Site? Need Help?

All times are GMT. The time now is 06:22 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2