Design desicions for a subwoofer amplifier

swede · 26th September 2001, 08:38 AM

Hi there,

I'm about to build an amplifier to drive a subwoofer. I plan to use two 10" elements in the box, but I'm not sure on what to do with the amp.

Well, I think I need following blocks in my solution:

* Power supply
* Low pass filter
* Some kind of protection
* Amplifier
* Some kind of volume control

The important working range for the amp is about 10Hz-300Hz (at least as I can se it).

My question is:

* Should I put the filter before, or after the amp?
* What design desicions should I make for the amp, since I don't care too much for frequencies above 300Hz.

I'm fairly new to this, so any response is appreciated.

Have a good one!
//magnus

tsz · 26th September 2001, 02:05 PM

Hello Magnus.

I think you should put the filter before the amp, no doubt.
It's more flexible and probably cheaper to.
Since the amp is only being used up to 300 Hz you might consider an Class B design.

at http://sound.westhost.com in the project section you find both amplifiers and crossovers.
I've built the crossover (project 9) but only lowpass for use with my subwoofers and it works fine.

Good luck!
/Tobbe

cunningham · 30th June 2004, 11:53 PM

try to use a direct coupled circuit for good low freq. responce; but remember to protect outputs...

djk · 1st July 2004, 06:10 AM

Another three year old thread.

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26th September 2001, 08:38 AM	#1
swede diyAudio Member Join Date: Sep 2001 Location: Geneva, Switzerland	Hi there, I'm about to build an amplifier to drive a subwoofer. I plan to use two 10" elements in the box, but I'm not sure on what to do with the amp. Well, I think I need following blocks in my solution: * Power supply * Low pass filter * Some kind of protection * Amplifier * Some kind of volume control The important working range for the amp is about 10Hz-300Hz (at least as I can se it). My question is: * Should I put the filter before, or after the amp? * What design desicions should I make for the amp, since I don't care too much for frequencies above 300Hz. I'm fairly new to this, so any response is appreciated. Have a good one! //magnus

26th September 2001, 02:05 PM	#2
tsz diyAudio Member Join Date: Aug 2001 Location: Göteborg, Sweden	Hello Magnus. I think you should put the filter before the amp, no doubt. It's more flexible and probably cheaper to. Since the amp is only being used up to 300 Hz you might consider an Class B design. at http://sound.westhost.com in the project section you find both amplifiers and crossovers. I've built the crossover (project 9) but only lowpass for use with my subwoofers and it works fine. Good luck! /Tobbe

30th June 2004, 11:53 PM	#3
cunningham diyAudio Member Join Date: Jun 2004 Location: Knoxville	try to use a direct coupled circuit for good low freq. responce; but remember to protect outputs...

1st July 2004, 06:10 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	Another three year old thread.