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Old 30th April 2008, 02:05 PM   #1
gmg733 is offline gmg733  United States
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Default Subwoofer Amp ~1500W

Greetings! I am wanting to build a 1500W sub amp for a mono 4 ohm load driver. Does anyone have any recommendations or schematics of such a beast?

Thanks in advance.

gmg733
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Old 30th April 2008, 05:32 PM   #2
TheMG is offline TheMG  Canada
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RMS rating or peak/music?

Either way, I don't think any chip-amp solution is going to work for those power levels. The closest thing would probably be a driver chip (such as the LME* series) with a discrete output stage.
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Old 1st May 2008, 09:35 PM   #3
gmg733 is offline gmg733  United States
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thanks!
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Old 2nd May 2008, 03:10 AM   #4
sr2002 is offline sr2002  India
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Can some one please elaborate on this point ...

Even im lookin for such a thing

How exactly do u add a descrete output stage to an Opamp circuit .... are there any kind of example circuits ....

Or incase of opa541/549 or lm3875 ... can u recommend such a circuit ...
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Old 2nd May 2008, 05:09 AM   #5
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Quote:
Originally posted by TheMG
RMS rating or peak/music?

Either way, I don't think any chip-amp solution is going to work for those power levels. The closest thing would probably be a driver chip (such as the LME* series) with a discrete output stage.
The LME chips are cool. I'm trying to get some.

For 1500W I'd recommend 15 pairs of NJL4281/4302 with another two pairs in parallel of those for drivers. You can use the extra thermal diodes for protection circuits.

That way you have the simple reliability of the IC chip, with the heavy-duty drive of the transistors.
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Old 2nd May 2008, 11:30 AM   #6
AndrewT is online now AndrewT  Scotland
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I think the LME series are limited to +-100Vdc.
for 1500W into 4ohms one would need supply rails of at least +-122Vdc and would probably need 28pair to survive heavy duty use.

ClassAB is a non starter.
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Old 2nd May 2008, 01:32 PM   #7
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I think everyone that wants a 1500W amplifier must stop whatching sci fi movies and car amplifier brochures.
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Old 2nd May 2008, 02:40 PM   #8
sreten is offline sreten  United Kingdom
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Default 1.5kW amplifier

http://sound.westhost.com/project117.htm /sreten.
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Old 4th May 2008, 01:03 AM   #9
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Remember a 1500 watt amp is going to need to be on a 20 amp dedicated circuit. The 1500 watt amps at diyaudio will draw more then their rated power from the wall plug unlike magical commercial amps that somehow output 1500 watts while only drawing 500 from the wall.
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Old 5th May 2008, 01:21 AM   #10
TheMG is offline TheMG  Canada
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It's important to remember amplifier RMS power rating is normally obtained with a pure sine wave (usually a 1kHz tone). Amplifiers driven hard with actual music never ever reach their full RMS power output.

And that is where Class D comes in handy. Under normal use (ie: music, not sine waves) the amplifier will likely never draw close it's rated output power, a class AB might draw up to it's rated power but rarely more.
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