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Old 02-12-2007, 10:45 PM   #1
jdiddy
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Default shot in the dark question for the gurus....

ok I know theres a small chance anyone can help me but....

I have a old Sony XM-2501 amp from 1996 thats 50x2 @ 4ohms or 65x2 @ 2ohms

and a

MTX Thunder 4122 amp thats from 2001 thats 50x2 @ 4ohms or 80x2 @ 2ohms

Now I am going to be driving some Polk Audio db6500 components that are rated for 4ohms @ 100wRMS & 300wpeak. Now should I be keep these speakers at their rated 4ohms, Im assuming so, and if so which amp should I be using? Sorry I don't know crap about car audio so TIA

Also if it matters the Sony amp is pretty light, but the MTX amp is quite heavy.
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Old 02-13-2007, 07:43 AM   #2
Aaron'z 2.5RS
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For starters qmp weight means almost nothing, it could be all heatsink.

But all things considered, go with as much power as you can, so do the MTX.

I don't really know how you would "keep" your speakers at thier rated 4ohms as there isn't a switch on any speaker (or speaker system for that matter) that allows you to change it's impedence. If you were to add more than one set of components, sure you could ohm down the amp, but that also increases distortion. This is why you most often see theses things happening in sub systems as the sub can handle the increase in distortion and you are less likely to hear it.... Not saying that people DON'T run 2-1ohm in the mid-high systems, just not as often.

Hope that answers your question
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Old 02-13-2007, 09:07 AM   #3
jdiddy
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Quote:
Originally Posted by Aaron'z 2.5RS View Post
For starters qmp weight means almost nothing, it could be all heatsink.

But all things considered, go with as much power as you can, so do the MTX.

I don't really know how you would "keep" your speakers at thier rated 4ohms as there isn't a switch on any speaker (or speaker system for that matter) that allows you to change it's impedence. If you were to add more than one set of components, sure you could ohm down the amp, but that also increases distortion. This is why you most often see theses things happening in sub systems as the sub can handle the increase in distortion and you are less likely to hear it.... Not saying that people DON'T run 2-1ohm in the mid-high systems, just not as often.

Hope that answers your question

So are you saying keep the speakers running at 4ohms? I know you cant change that on the speaker, but isnt it in how you wire the speakers to the amp that controls the ohms? So if you are saying keep the speakers running at their 4ohm rating to still go with the MTX even though both amps are rated for 50x2 @ 4ohms???????
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Old 02-13-2007, 09:33 AM   #4
the suicidal eggroll
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The only way to change the impedance would be to wire the speakers in parallel and put them on a single channel, so now you're comparing 80x1 (40 per speaker) in 100% mono (no stereo separation) vs 50x2 (50 per speaker) in stereo...the choice is clear.

If they both truly put out 50x2 @ 4ohm then it shouldn't really matter which you choose, but I trust MTX more than Sony, so that would be my choice.
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Old 02-13-2007, 10:13 AM   #5
jdiddy
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Quote:
Originally Posted by the suicidal eggroll View Post
The only way to change the impedance would be to wire the speakers in parallel and put them on a single channel, so now you're comparing 80x1 (40 per speaker) in 100% mono (no stereo separation) vs 50x2 (50 per speaker) in stereo...the choice is clear.

If they both truly put out 50x2 @ 4ohm then it shouldn't really matter which you choose, but I trust MTX more than Sony, so that would be my choice.
cool thanks, Ive asked this question on a few other forums and asked a few people IRL and everyone has said MTX.
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