Phoenix Gold Phorum

I am sure we have all seen the amp dyno for the 2250, I am curious what the real life ratings on the mps2500 are compared to it? Obviously the mps is made to go into lower ohm loads but I was just curious about how the two would compare if anyone has ever tested the two?

I think the better question is how does it compare to the ms2125 and that is what it was made like just a lower impedance ms2125
I would guess the ms250 at full power should be just less than 1/2 of a ms250 as hest is the issues

I thought the ms2125 and the mps2500 is the same power but the mps2500 needs lower impedance to deliever max. The Dyno of the ms2125 i believe maxed out 1194w dynamic.
The ms2250 has twice the power and maxed out 2409w dynamic.

that is what I mean it would be cool to see 2500 on the dyno to get a real world output. The rumors on the old PG/cheater amps could be hard to believe till the dyno vids.

This is why I said little less than 1/2 of the ms2250

"I would guess the ms250 at full power should be just less than 1/2 of a ms250 as hest is the issues"

I really wasn't sure what you were trying to say there mike.

First off the ms2550 was pushing the ms amp heat sink aka the fan
The ms2125 all day could run fine this was there bread and butter
So
The mps is the same heat sink buy I believe the itd made to run lower impedance but I think it will max out the heat sink
So let's say the ms250 does 2000 watt
The ms2125 will do 1000 I would say she will do 900 close and your post said ms 250 if you get more than 250 watts I will eat my shirt

kg1961 wrote: So let's say the ms250 does 2000 watt
The ms2125 will do 1000 I would say she will do 900 close and your post said ms 250 if you get more than 250 watts I will eat my shirt

I was right with you up until the last two lines.

The MS2250, MS2125, MAC500, and MPS2500 should all be the same power, depending on load.

They are all the same design, and in the same heatsink.

The only one with any advantage is the MS2250, which has power supply MOSFETs with slightly more current capability. Honestly, I think the output section is more the limiting factor in this amp family's design, so I really don't think those MOSFETs are going to give the amp twice the advantage.

Any one of them should do 1,200W RMS into the correct load.

I have ran the 2500 and the 2250 years ago in my spl truck two different systems the 2250 definitely puts out more power I also ran my 2250's 4 of them on 8 15's each one pushing 2 15's at 2 ohms mono I wouldn't recommend that now days because of they are no longer made this was when they first came out and I worked at a stereo shop that was a pg dealer I can't tell you how many times I had to send them back to pg on my dime 100 next day shipping they would fix them and send them back to me next day shipping on there dime back . I also ran when I only had two 2250's with 8 15's ran each one to 4 15's parallel mono the 15's where single voice coil 4 ohms man it was loud for about two bass notes then would clip off did that for about 30 minutes and one of the amps caught fire so don't do that I was 17-18 years old. Anyway yes more power more heat more problems but I abused them. Never had a problem out of the 2500's but I didn't abuse those I had two of them on 6 solo baric 12's that where 4 ohms. Maybe we can get Big D to dyno the 2500.

You should know Eric, the MS2250 has bigger power supply toroids and better cooling than the rest of the big MS/MPS amps.

I think the dyno run vids show quite clearly that a MS2250 can do about double RMS and dynamic power compared to the rest.

I assume you mean better cooling in the shroud for the 2250?

Mr. Wild wrote:You should know Eric, the MS2250 has bigger power supply toroids and better cooling than the rest of the big MS/MPS amps.

I think the dyno run vids show quite clearly that a MS2250 can do about double RMS and dynamic power compared to the rest.

Those are good points, but really the size of the transformer is not important, so long as it meets the design requirement. If one were to rewind the transformer in a MPS2500 using an MS2250 iron core, it would not make the amplifier any more powerful.

And cooling is not relevant, as anyone can setup a forced air cooling system for the MPS2500.

I think my main point is if the MS2250 can do say 1,200W into 4 ohms, and the MPS2500 can do 900W (I am just throwing out numbers for arguments sake) at 1 ohm then the MPS2500 should be able to do the same 1,200W as the MS2250 if you run it even lower at 0.5 ohm for example.

If you are not getting the full 1,200W from any of the "full sized" MS family amps, then you need to go with lower impedance to get it.

I think we need to petition the guy doing the amp dyno to do a test on the full line. He can use my 2500 if he wants...

The part you don't see sometime with these old amp being pushed hard is they fail
I would not put it through the stress just to get some numbers.
Remember how people go upset of the off roads being tested

I am not afraid to make some people angry.

I would be more worried about breaking that unit up she is nice looking

I would say do it . The offroad amp is VERY rare the 2500 isn't. Shit big d might even have one I have a 2500 but it needs a lot of work not even sure if it is even repairable scott if yours is in very good shape internally and out side don't

thats what I am sayin. Its not a one of a kind, nice yes but replaceable.

The biggest difference between the M(P)S amp lineup is the rail voltage.

MS2250 +-58V
MAC500 +-50V
MS2125 +-36V
MPS2500+-28V

MS2125 and MPS2500 are specced at same power ~500W rms, but at different loads.

Since the MPS makes its power at half the ohms, its parasitic power losses are double that of MS2125. Which means it will heat up more at same power. That is why it will make less power than a MS2125 in the end.

I have said it before: Cheater amps are cool, but from an electrical viewpoint they are plain stupid. Higher voltage/ load impedance equals less power loss, if the amp is otherwise the same.

Mr. Wild wrote:The biggest difference between the M(P)S amp lineup is the rail voltage.

MS2250 +-58V
MAC500 +-50V
MS2125 +-36V
MPS2500+-28V

MS2125 and MPS2500 are specced at same power ~500W rms, but at different loads.

Since the MPS makes its power at half the ohms, its parasitic power losses are double that of MS2125. Which means it will heat up more at same power. That is why it will make less power than a MS2125 in the end.

I have said it before: Cheater amps are cool, but from an electrical viewpoint they are plain stupid. Higher voltage/ load impedance equals less power loss, if the amp is otherwise the same.

The mac500 does the 2125 and 2500 power at 8 ohms, so with less load, would it have less heat, so therefore even less parasitic loss?

BigD has already stated on FB that he would like to test the MPS2500 but needs someone to send him one to to test. He does not have have a 2500.

I can't afford to pay for the shipping but if he does he can use mine.