PM 1200 on high end only

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Glenlivet
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PM 1200 on high end only

Post by Glenlivet » Mon Jan 10, 2011 7:02 pm

Hey, quick question for the knowledgeable... I'm thinking about bi-amping the mains on my TGA 7400 by running my highs with a PM 1200 I just happen to have laying around (on top of a couple of spare PM 1.5a's).
Didn't I read an opinion lately, that these amps might run into some sort of difficulty when used for high frequency only?
It would seem to make sense when bi-amping a TGA 7400 to run Kappa 9's, to keep the TGA's current source output for the main lows and maybe use the PM 1200 for the highs...

Or maybe I should use the PM 1200 for the full range rear speakers, and use the freed up channels they'd occupied for the mains highs.
I'm leaning toward the latter.
Just wondered what others might think.

ps I'm-a be using a dbx 234 active crossover.

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kingman
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Re: PM 1200 on high end only

Post by kingman » Mon Jan 10, 2011 7:15 pm

Current source is the output method most frequently associated with tube amplifiers, while voltage source is most often associated with solid-state amplification
My thinking is NOT to use a PM-1200 for the highs...use the current source on the TGA-7400. Use the PM for low frequencies such as subs, etc.
In reality, it only matters what it sounds like to YOU!!!

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F1nut
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Re: PM 1200 on high end only

Post by F1nut » Mon Jan 10, 2011 9:13 pm

kingman wrote: My thinking is NOT to use a PM-1200 for the highs...use the current source on the TGA-7400. Use the PM for low frequencies such as subs, etc.
That makes the most sense.
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angelod307
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Re: PM 1200 on high end only

Post by angelod307 » Mon Jan 10, 2011 10:12 pm

x3

the pm will sound flat but loud just the same. they are best used on lows. just for your knowledge, try it on the highs and report your thoughts about it compared to the 1.5 on highs.
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Glenlivet
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Re: PM 1200 on high end only

Post by Glenlivet » Mon Jan 10, 2011 11:33 pm

I wasn't going to use any of the PM 1.5a's at all. My understanding is that the PM 1200 is virtually the same as the PM 1.5a anyway, though I could be missing something.

I'm just short for bi-amping the prime movers by two amplifier channels, if I'm to make a full Dolby 7.1 surround system using the TGA/TGP stuff and have bi-amped front speakers.

I got addicted to bi/tri amping my system years ago and I gotta have it. I'm just looking for the best way to supplement amplifier channel numbers by throwing another stereo amp (the PM 1200) into the mix. Until I can get my hands on a 600-2 that is. :D

Thanks for the input all around. Not using the PM 1200 on the highs makes sense.

angelod307
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Re: PM 1200 on high end only

Post by angelod307 » Mon Jan 10, 2011 11:54 pm

in pro applications, they typically use big horns that are very sensitive and are after one thing, loud. imaging is not that important in a stadium, arena and what not.
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fhawk618
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Re: PM 1200 on high end only

Post by fhawk618 » Wed Jan 12, 2011 5:41 am

I use both PM 1.5 and PM 1.5A amps for pro audio. The PM 1200 is a PM 1.5A with a darker faceplate. The PM 1.5A/PM 1200 amps differ from the original PM 1.5 via the addition of two extra output transistors per channel and an additional cooling fan to (supposedly) better accomodate lower impedence loads, and are (especially in your case) better suited for low-end applications. They are designed to provide brute power; therefore, they will certainly meet your needs, but I think that you will find them noisy (fan-wise) for home use.

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