Old School GOODNESS

[tweet02 10+ year member]

I just bought 2 Pheonix Gold MS2125 amps. They were in a 85 Regal pushing 2 15 inch Alpine type R's, and this guy was thumpin. The R's were catching hell with these amps, he had them bridged at 2 ohms, 1 on each sub. What do you guys think these amps put out, i know the R's can take 1k daily, and it look like these amps were given the subs all they could stand. Plz give me your input on these, if you have any....Thanks!

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[Spooney 10+ year member]

Beautiful amps.

 

[gunz4me2 10+ year member]

Those amplifiers were NOT rated to run at anything lower than 4 ohms bridged and would put out 600+ watts RMS @ 4 ohms mono.

Granted, I am sure they can run at 2 ohms mono with the proper electrical and proper cooling, but WHY on earth would someone want to run THOSE particular amplifiers on subwoofers is beyond me. IMHO that is a waste with the abundance of cheap class D amplifiers on the markets. Also, those amplifiers would be better suited for your mids and highs.

Those poor old school amps.... //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[cleansoundzz 10+ year member]

Some dudes have no idea what they are doing with their systems.

 

[infamous_e46 5,000+ posts]

tweet u bastard

 

[Shinju 10+ year member]

Those amplifiers were NOT rated to run at anything lower than 4 ohms bridged and would put out 600+ watts RMS @ 4 ohms mono.
Granted, I am sure they can run at 2 ohms mono with the proper electrical and proper cooling, but WHY on earth would someone want to run THOSE particular amplifiers on subwoofers is beyond me. IMHO that is a waste with the abundance of cheap class D amplifiers on the markets. Also, those amplifiers would be better suited for your mids and highs.

Those poor old school amps.... //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

Not true, They can run and even the manual states you can run the 2125 1ohm stereo and 2 ohm mono, and like you said with ample cooling, plus back then they suggested the Phoenix Gold 1 farad cap if you were going to do it.

the MPS 2500 (yes I have owned both) can be ran at .5 stereo and 1ohm mono (rated at 1ohm stereo or 2ohm mono) again with how I discribed above.

I had the 2 massive fan shrouds for mine if you look at the old school collectors thread you will see.

OP you will need to get the 12 power supply caps replaced reguardless, ALL phoenix gold amps from 90-98 have bad caps that leak and can catch fire. its about 20 bucks for the caps if you do it yourself or if you find someone to do it for you what ever they charge. but it will need to be done. Rather you can see the cap leak or not I will promise you with out a doubt under neath those some are and have leaked a little.

how much did you pay anyway?

 

[gunz4me2 10+ year member]

Not true, They can run and even the manual states you can run the 2125 1ohm stereo and 2 ohm mono, and like you said with ample cooling, plus back then they suggested the Phoenix Gold 1 farad cap if you were going to do it.
the MPS 2500 (yes I have owned both) can be ran at .5 stereo and 1ohm mono (rated at 1ohm stereo or 2ohm mono) again with how I discribed above.

I had the 2 massive fan shrouds for mine if you look at the old school collectors thread you will see.

OP you will need to get the 12 power supply caps replaced reguardless, ALL phoenix gold amps from 90-98 have bad caps that leak and can catch fire. its about 20 bucks for the caps if you do it yourself or if you find someone to do it for you what ever they charge. but it will need to be done. Rather you can see the cap leak or not I will promise you with out a doubt under neath those some are and have leaked a little.

Maybe I am looking at the wrong manual?

Regardless, I will pose these questions to you... Would YOU run those amplifiers at 2 ohms mono on subwoofers? Better yet, would YOU set those amplifiers up to run at 2 ohms mono for the typical ca.com forum member who is in the quest for the almighty 150 decibels on the termlab?

My answers to both those questions are NO!

 

[Shinju 10+ year member]

Would I? Now no, Back in the day Yes and I did. And the manual I was talking about is the online version at the orginal phoenix gold website.

MS/MPS Amplifiers

Q: What might I need to run my amplifier to safely run into 2 ohm bridged?

The MS series has no "governor" or "limiter" circuits to restrict it's power supply when you run at lower impedances. This means if your careful and no what your doing, you can get a lot of performance out of your amp.

Bridging the MS series to a 2 ohm load is not a problem IF you pay attention to a few basic things:

1. If this were the only amp in the system, it would require at least 2 gauge wire from the battery to the rear of the car. Since it is very likely that you will have some amps for mids and highs, I highly suggest running 1/0 wire from front to rear. Then use 4 gauge wire from a distribution block to a minimum 1 farad capacitor. Finally, 4 gauge from the capacitor to the amp. Add more caps if you can afford them and fit them into your install. A 4 gauge ground wire to the rear frame assembly will provide a good ground.

There's no need for a dedicated fuse for any MS or MPS amp. However, for competition you may want one anyway to meet the "easy and quick access" judging rules. If the amp were mounted upside down under a quick opening Plexiglas panel or something, that would take care of it.

The reason for all the power wiring overkill is a matter of basic ohm's law. For example a MS2125, will TRY to double its power and make about 1,000 watts. However, the size of the amp's power supply will only allow it to make about 720 watts. To make that much power, the power supply MUST have adequate amounts of current. How much? At max undistorted output with typical music material, about 65 amps continuous with peaks (

When everything is complete, you can check the voltage drop at the amp's power terminals with the engine idling and no electrical loads turned on. Then play the system at maximum and watch the voltage sag with heavy bass notes. Maximum allowable sag is about 1 volt. Ideally, it should be less than 1/2 volt.

2. You'll need cooling fans. Extra power means extra heat. The heatsink isn't large enough to naturally dissipate the heat generated from low impedance operation. This is another reason people like to put the amp upside down under Plexiglas. With an enclosed amp rack and a couple of 3 inch fans on each end (two pushing and two pulling), you can force the air through the heatsink fins.

 

[tweet02 10+ year member]

tweet u bastard

Hate on me baby, hate on me baby!!

 

[Wingman0121 10+ year member]

mmmmmm old school PG stuff, keep em clean and they'll increase in resale value.

 

[tweet02 10+ year member]

What are these amps worth???

 

[pickup1 5,000+ posts]

they are ok...i'll give ya 100 shippd for 1!!!

 

[tweet02 10+ year member]

LMAO, thats why your still holding that same 100.00 bucs

 

[PsychoTheRapist 5,000+ posts]

What are these amps worth???

Depending on condition, between 275-400 each, maybe more to the right person.

 

[tweet02 10+ year member]

Well, im no GURU on these, but there just dusty on the top, and a lil wear on the mounting holes, 1 has a plexi bottom due to being a show amp, but thats it, i would give them a 8.5 of 10, just my 2 cents!!