PPI Promos 25 - Actual output? - diyAudio
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Old 9th September 2007, 02:05 AM   #1
Sub Ace is offline Sub Ace  United States
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Default PPI Promos 25 - Actual output?

Hello Everyone! Thank you for letting me join your forum! I've been a vistor here quite a few times and I admire the wealth of technical knowledge here.

So here goes my first post. I recently purchased a PPI Promos 25 and was wondering what the bridged output is at 4 ohms and 2 ohm @ 13.6V and 14.4V? I understand that this amp is conservative rated and want to match the right sub to it.

I will be using it to replace a MTX Thunder 302. I expect the sound quality and power output will exceed the 302's rating of 425 watts bridged 4 ohms @ 14.4V.

Any info would be greatly appreciated!

Thanks Again!
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Old 9th September 2007, 03:10 AM   #2
ppia600 is offline ppia600  United States
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I think the pro mos 25 is:

25 watts by two channels into 4 ohms stereo
50 watts by two channels into 2 ohms stereo
100 watts by two channels into 1 ohms stereo
200 watts into one channel bridged into 2 ohms

That is if its the white one with fins. I had a pro mos 50 with fins and it was 400 watts rms bridged into 2ohms.


They are pretty under rated though. There is no way it will be more powerful than your mtx 302. That is a really good amp, and also under rated. It is also more advanced in design than the ppi which doesn't mean its better, but it does help in the power output department. The pro mos is mosfet in the power supply and bipolar for the output stages. The mtx is mosfet for both the power supply and output stages. I'm going to go check a few things because I was thinking the pro mos 25 was more like 200 watts bridged into 2 ohms... not sure though..
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Old 9th September 2007, 05:07 PM   #3
Sub Ace is offline Sub Ace  United States
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Yes it is a white one with fins. Is the output section on the Promos 25 unregulated? Sounds like I will need a higher efficiency sub, upwards of 93db, to get the best use of the PPI amp.

Thanks Again!
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Old 9th September 2007, 07:38 PM   #4
ppia600 is offline ppia600  United States
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I'm not sure if they are regulated, but since they are the ones designed for cheating in competitions, it is likely it isn't. I believe the art amps and power class lines are regulated, but not sure about those. I used to run my pro mos 50 bridged into 2 ohms mono into an image dynamics IDQ 12 and it was very impressive.
Maybe you should look into using a ported box and designing the box around the woofer and the vehicle to make use of the amp's power.
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Old 10th September 2007, 07:48 AM   #5
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According to my recollection all the white ppi amps where tightly regulated. As far as being under rated all the reviews that I remember of the art series all showed that they produced very near their rated output, that is opposed to others that don't get near to their rated output. I also have a vague recollection that the output was 2 x 12.5 @ 4 ohms but at the moment I can't find my old ppi catalogue to confirm this...
I hope that this helps some....
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Old 10th September 2007, 12:51 PM   #6
ppia600 is offline ppia600  United States
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/\ I was thinking 12.5 at first too, but can't find any literature either. I know my pro mos 50 was 50 by two (not the freak black art one I have now). It was written on top of the amp and mine was the white finned type with the nice colorful silk screening on the top, too.
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Old 10th September 2007, 10:24 PM   #7
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I found my catalogue and it states that

the Pro Mos 12 was

2 x 12.5wrms @ 4 ohms
2 x 25wrms @ 2 ohms
2 x 50wrms @ 1 ohm
1 x 100wrms @ 2 ohms

the Pro Mos 25 was

2 x 25wrms @ 4 ohms
2 x 50wrms @ 2 ohms
2 x 100wrms @ 1 ohm
1 x 200wrms @ 2 ohm

the Pro Mos 50 was

2 x 50wrms @ 4 ohms
2 x 100wrms @ 2 ohms
2 x 200wrms @ 1 ohm
1 x 400wrms @ 2 ohms

the Pro Mos 425 was the same spec as two Pro Mos 25's and the Pro Mos 450 was the same as two Pro Mos 50's.

These were the white finned variety that ran at the same time as the art series....

I hope that this clears up some details...

Junglejuice
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Old 10th September 2007, 10:26 PM   #8
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So to answer the original question if you have have an amp that puts out 400+ wrms then you Pro Mos 25 will not get any where near it as it is only good for 200wrms....
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Old 11th September 2007, 12:29 AM   #9
ppia600 is offline ppia600  United States
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Cool.. so post 2 is correct then We must have both gotten the 12 and the 25 confused at first. Would there happen to be anything about my black art pro mos 50 in your catalogue?
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Old 11th September 2007, 12:34 PM   #10
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No, only the finned white ones. As I said before I have never seen one like yours before.
Don't forget I would really like to know the rail voltages of those two amps of yours...
Cheers, Junglejuice....
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