How to make a mps-2500 put out like a MS-2250

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jammin
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How to make a mps-2500 put out like a MS-2250

Post by jammin »

Just a question I been wanting to know? I have some MPS-2500 amps and I want to know what is the process to make them put out like a MS-2250. As far as I can tell the power supply is green and mine is red. Can some hard core nuts let me know what to do. I have a friend at a audio repair shop in duluth ga that can do anything but I need to have a list for him to work with. Thanks to anyone who can put some input. Also he has replaced caps and fixed a preamp. I know he is good and if yall need his number to do some work let me know thanks...
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smgreen20
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Re: How to make a mps-2500 put out like a MS-2250

Post by smgreen20 »

EricD could tell you for sure, I know there are a few others here too that can help, I just can't remember who all could. I've known Eric for a long time and he has impressed most of us here with what he can do. PM him and see what he says. Be patient, it takes him a while sometimes to respond.

I don't mean to cut anyone else short, I've just been to busy to "link" in my head the others that do know.
"ZPA's will have the same sound essentially as you get from the MS, they just feature a bigger shinier set of balls."

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vladthebad
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Re: How to make a mps-2500 put out like a MS-2250

Post by vladthebad »

Simple. Hand wind your own ribbon wound transformers to match the 2250TA or original 2250... Replace the power supply mosfets with beefier ones, replace all the caps with higher voltage versions, and replace a handful of other parts.... In your case, you might have to also replace the outputs with different ones that handle more voltage as well.

This is not a simple task, if you wanted someone like Erik or a quality tech with pg schematics... to do it for you, I'm guessing it would cost as much as a MS2250TA... if not more. It's not exactly worth doing unless you really really want it bad.
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00goobs
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How to make a mps-2500 put out like a MS-2250

Post by 00goobs »

Load the amp to 1ohm stereo will get you close...

It would be cheaper and easier to make an MS2250TA put out like an original MS2250. I've asked something similar about an MS2125...


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jammin
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Re: How to make a mps-2500 put out like a MS-2250

Post by jammin »

Schematics? Is there someone that has details about each values to use and thanks for everyones input.
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Re: How to make a mps-2500 put out like a MS-2250

Post by ttocs »

you have to know the secret handshake.
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vladthebad
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Re: How to make a mps-2500 put out like a MS-2250

Post by vladthebad »

I don't think anyone other tha. Pg techs or ex pg techs have the schematics. I think someone gave Eric a list of some of the differences, and he may have had access to an old ms2250 to figure the rest out. It's not exactly rocket science, but its certainly closer to rocket science than it is changing your oil or mowing the lawn.

There is a pair of 2250ta on eBay right now, might be good enough, or a place to start. Also an original 2250 on there or there was a week or so ago.... I really don't see how it'd be cheaper to change yours over than to just buy what you want....

I'd love to get my original 2250 fixed, but frankly it's not in great shape and even fixed I'm not sure what I'd run it in/on... May end up a wall hanger for years. Doesn't exactly match my ti stuff either.
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Mr. Wild
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Re: How to make a mps-2500 put out like a MS-2250

Post by Mr. Wild »

They both put out similar power, but into different loads. Plus the mps needs fan cooling like the 2250 to sustain power.
So slap on a shroud, use huge gauge power wire and load that mother down 1 ohm bridged. Now were talkin' 1kW.
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valeks1
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Re: How to make a mps-2500 put out like a MS-2250

Post by valeks1 »

Do you want MS2250 or you want MS2250TA?
jammin
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Re: How to make a mps-2500 put out like a MS-2250

Post by jammin »

I have two mps-2500 amps bridged on 4 jl 12s as far as I know they put out 500 mono or so and would like to see 1000 so if the ta puts out more thats the one. There are pics i posted on my install here posted under the back seat in the install pics take a look they look nice connected with one big clear top. Its loud but i know the subs can take more... I see the amp on ebay its almost 700 bucks. Thanks for the input yall this is good stuff and iam very serious about taking this on with juan from hitech electronics duluth ga. Instructions are a must high five thanx..
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Mr. Wild
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Re: How to make a mps-2500 put out like a MS-2250

Post by Mr. Wild »

You cant do 2ohm bridged on a MS2250 but a MS2125 can do that. Maybe a 2250TA can too, Im not sure. Im assuming you JLs are 4 ohm each.
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Eric D
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Re: How to make a mps-2500 put out like a MS-2250

Post by Eric D »

The MS2250TA can do 2 ohm bridged. It will get plenty hot though.

Converting a MPS2500 to a MS2250 will require new transformer iron cores (they are larger on the MS2250), and sourcing them may be difficult (I doubt PG has any to sell).

I personally converted a MS2250TA into the original MS2250 and it required around 30 parts, plus hand winding the transformers, which was the most difficult task. Sourcing the wire was also difficult for me. Maybe not so hard now though, as I did my conversion 8 or 9 years ago.

There are members here who may be able to sell you OEM MS2250 or MS2250TA transformers ready to go. Some guys ended up with spares from color conversions.

Going from a MPS2500 to a MS2250TA or original MS2250 will take significantly more parts. I am guessing as much as 40% of the parts on the amp are different values.
Got "schooled" by member shawn k on May 10th, 2011...
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jammin
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Re: How to make a mps-2500 put out like a MS-2250

Post by jammin »

[quote="Eric D"]

:P Eric D iam glad you responded you are the brains of this job from what I been told. So sence you are would you think its worth the time to mod this unit and 2nd I have both them connected but would like to know if anyone has a heat sink case for one that I can put both boards into? Also is there anything I can do that is a easy mod to get another 100 or so watts more. Also a question is one of my amps have the 4 speaker wires on one side like a ms2125 and the other has two on each side like a MS-2250 and the one that has them together has some kinda extra black thing with 3 legs next to the mosfets in the sides near the small ones. The other one dont have it. Both say mps-2500 on the side plates. Did they make them both ways or a newer version came out. They both are about the same when I tune it just one is a little more agressive.. Thanks
Audio control 3.1, EQX II, MPS-2500 x2, PPI A404 x3, The rest is top secret.

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vladthebad
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Re: How to make a mps-2500 put out like a MS-2250

Post by vladthebad »

My guess is the TAs on eBay would be cheaper or about the same price as converting yours. And then you'd have the mps's to sell of hang on your wall. Watch the gains and turn off any boost junk at 2ohm bridged on the TAs though. You'll also want some airflow via fans as well most likely. Other option would be to offer your mps's in trade or something, maybe someone has a TA or two or an ms1000ta they're looking to part with.

Two ohm bridged on an original ms2250 is a no no unless your seriously watching the gains, xo settings, and eq... With lots of fans, and limiting power output to no more than a TA would put out except on rare peaks.
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Eric D
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Re: How to make a mps-2500 put out like a MS-2250

Post by Eric D »

Modding a MS2250TA into a MS2250 original is the least work. Going from a MS2125 is more work. Going from a MPS2500 is the most work.

Maybe this puts some perspective on it...

I have a MS2250TA sitting on the shelf next to me. It is completely OEM, and in great condition. I have all the parts and equipment I need to convert it to an MS2250 original. I plan on converting it to an MS2250 original. Well, the amp has been sitting in the same spot for 2 years now, without anything being done to it. I just don't have the motivation to do all the work required at this point. I will get around to it some day, but it is just such a pain I am in no hurry.
Got "schooled" by member shawn k on May 10th, 2011...
No longer really "in tune" with the audio industry, and probably have not been for some time.
Hands down the forum's most ignorant member...
Don't even know what Ohm's law is...
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