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Old 10-01-2001, 09:36 PM   #1
sti2_5rs
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Question Sub & amp power Q!

my system is going to be 2 12's sub RMS power from 50-300

and my amp is going to power each sub for 200 RMS Max. Is it going to be ok or i am under power?

Thanks

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Old 10-01-2001, 10:01 PM   #2
Aaron'z 2.5RS
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You'll be pushing 100w RMS to each sub (hopefully) Thats not bad. I wouldn't try winning any boom contests with that but if you keep your head your subs should last a while.

AaRoN
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Old 10-01-2001, 10:12 PM   #3
sti2_5rs
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just to clear things up.

2 12's sub each rating RMS power 50-300W

and my amp is 2X200W RMS

I don't know if that's under-power or what, since i've heard people blow their subs because of under-power.

Thanks
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Old 10-02-2001, 12:05 AM   #4
Billy
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Did you buy everything at one shop? Just because an amp is rated at 2x200WRMS doesn't mean it will produce that when faced with some reactive load that is a subwoofer or a pair of them.

Basically they have to be impedance matched to get the most out of them. Hopefully they are but if you post the stats from spec sheets we can tell you for sure. Also if each of your subs is getting 200WRMS, then you should be fine unless your subs are seriously power hungry or you are a basshead in the making! :P

I wouldn't worry about underpowering your subs either.

I'm from the RC school of thought, worry about overpowering them because heat is what blows speakers... not lack of heat.
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Old 10-02-2001, 02:24 AM   #5
Aaron'z 2.5RS
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Billy,Billy,Billy.....


I must interject here, and drop some knowledge..........

Quote:
I'm from the RC school of thought, worry about overpowering them because heat is what blows speakers... not lack of heat.
This is a VERY common misconception and is exactaly the oppisite.
When you do not have enough power and try and push things harder, amps have a tendency to "clip" or distort. An amps output is an AC waveform, when an amp clips it clips off the top and bottom of that waveform......sending straight DC out to the speaker. If you have ever dropped a screwdriver across the terminals of your battery you would see that it will weld itself to the terminals. Well, the same thing happens in an "under-powered" sub. The amp clips, sends out DC to the voice coil, it starts to heat up and eventually the glue starts to soften and finally the coil either burns to an "open" or it swells enought to come in contact with the rest of the motor structure and you get that grinding sounds and/or all movement stop peroid.

So the moral of the story is....too much power is just enough.

Most people use the "gain" on an amp as a volume control, where the gain is used to match the output of the component before the amp, to the input section of the amp. With that said, having more power allows you to use less gain to get the SAME ammount of output.

on another note you mentioned impedence matching, which with a speaker is impossible without using an "impedence matching transformer" A speakers impedence changes constantly with frequency and you could never "match" two speakers by simply using the "thele small parameters" (the spec sheet you get with the subs)

I better stop now, i keep opening up new cans of worms and really need to get some work done, here at work.

Hope to not offend but to educate......

Peas,
AaRoN
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Old 10-02-2001, 11:28 AM   #6
sti2_5rs
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Good Stuff Aaron!!

I saw something similar to your post on cruthfield.com

and that's what i worried when some sub's claim they have sth like 50-300W RMS and your amp only produce 200RMS Max from the spec sheet. Then, i may blow my sub bacuse of under-power.

I know many of them are wayyyyyyyyy over rated, but hey i am still a beginner, there's many things i don't know!!!
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Old 10-02-2001, 11:56 AM   #7
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If you keep your volumes at a moderate level, you have nothing to worry about sti2_5rs. If your amps are really pushing around 200RMS, you'll be fine. Concentrate on a quality box, that'll make your subs tighter and louder at a lower gain setting, extending their life.

You want to overpower more than underpower, but you're in the operating range, so you'll be fine. Personally, I run about 300Watts RMS(very, very clean signal, too) to a JL10W1, that is rated at about 125watts RMS. My gain is only about 1/5th up, and it sounds great. Definitely smoother, tighter, and cleaner than when I was running it at about 130watts RMS off a mid-range amp. Keep your gains at a respectable level, and no problems.

Neil
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Old 10-02-2001, 02:53 PM   #8
Corpsie
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bridging that amp into a single sub may be more ideal. 2 subs can get destructive wave interference (aka, make certain frequencies quieter).

IMNSHO: a single sub system is good for cars as small as these.
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