300W 8ohms mosfet amplifier for sub schematic ?

PTSOUNDLAB · 12th October 2003, 10:37 PM

Hello,

does somebody know a good 250-300W in 8 ohms mosfet amplifier for subwoofer and where to find schematic for DIY ?

Thank you.

Pascal.

Mattyo5 · 13th October 2003, 02:13 AM

www.sound.westhost.com project 68

or www.aussieamplifiers.com

i just build aussieamplifiers symmetrical 400's amps, and they are 200 into 8 ohms and 400 into 4.....bass is terrific! effortless for sure and VERY tight and VERY punchy and VERY articulate. You might be able to increase the rail voltage slightly, if you have more outputs, like 12 per channel rather than 8...and better driver transistors, such as mje15032 and 15033 ...i've used them w/ great sucess w/ 68v rails. If you try 75v or 80...you might get a little more punch into 8 ohms and less into 4...but i personnally think 200 watts is a lot. 250 is about .5-1 db greater...and 300 is about 1.5 db greater than 200. Go w/ recommended rail voltage...70v. Later!

-Matthew K. Olson

FocusST225 · 26th July 2012, 07:40 PM

Search for "quasi" on this site. He has a great amplifier design and it sound awesome. I built the 500w version (10 x N-channel Mosfets per amplifier channel) Easy to build and and very reliable.

12th October 2003, 10:37 PM	#1
PTSOUNDLAB diyAudio Member Join Date: Dec 2001 Location: FRANCE / TOULOUSE	300W 8ohms mosfet amplifier for sub schematic ? Hello, does somebody know a good 250-300W in 8 ohms mosfet amplifier for subwoofer and where to find schematic for DIY ? Thank you. Pascal.

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13th October 2003, 02:13 AM	#2
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	www.sound.westhost.com project 68 or www.aussieamplifiers.com i just build aussieamplifiers symmetrical 400's amps, and they are 200 into 8 ohms and 400 into 4.....bass is terrific! effortless for sure and VERY tight and VERY punchy and VERY articulate. You might be able to increase the rail voltage slightly, if you have more outputs, like 12 per channel rather than 8...and better driver transistors, such as mje15032 and 15033 ...i've used them w/ great sucess w/ 68v rails. If you try 75v or 80...you might get a little more punch into 8 ohms and less into 4...but i personnally think 200 watts is a lot. 250 is about .5-1 db greater...and 300 is about 1.5 db greater than 200. Go w/ recommended rail voltage...70v. Later! -Matthew K. Olson

26th July 2012, 07:40 PM	#3
FocusST225 diyAudio Member Join Date: Dec 2009	Search for "quasi" on this site. He has a great amplifier design and it sound awesome. I built the 500w version (10 x N-channel Mosfets per amplifier channel) Easy to build and and very reliable.