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Risto80 29th June 2007 09:50 AM

Project 100W MJ15003 MJ15004
The Web Page that I found is:

There is a amplifier its uses one pair of mj15003/04
I like to use as a car amp wit subwoofer of 400W
Can it handle it or wath?

richie00boy 29th June 2007 10:54 AM

You need a SMPS to power the amp in a car. 100W in a car should be OK.

Risto80 29th June 2007 11:42 AM

I have design SMPS +/- 35V, but the question is is this amplifier can handle 400wRMS suboofer or will be broken

richie00boy 29th June 2007 12:23 PM

It will be fine. Amps don't 'handle' speaker power, speakers 'handle' the power they are given.

You could have a 100W, 400W or 1000W speaker, as far as the amps is concerned as long as they are all the same impedance it doesn't care.

AndrewT 1st July 2007 03:46 PM

1pair of MJ15003/4 will manage about 125W into 3ohm from +-35Vdc using +-30mF if you can keep them cool enough to survive.
2ohm loading can only reach 28degree phase angle @ about 170W.

sandyK 1st July 2007 10:27 PM

Project 100W MJ15003 MJ15004
I like your remark about keeping them cool enough to survive.
One pair is best kept to 50W, and 2 pairs for 100W into 4 ohms.

AndrewT 1st July 2007 10:58 PM

2pair should be able to go to 180W into 2ohm @ 60degree phase angle and Tc<60degC.
But 1ohm can only manage 25degree phase angle.

It seems that 1pair could make a reasonable 4ohm amplifier but need blown sinks.
2pair would do as a 2ohm amplifier with a big unblown sink.

sandyK 1st July 2007 11:08 PM

Project 100W MJ15003 MJ15004
The trouble is that many people skimp on the size of the heatsinks, and don't use fans for higher power versions.

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