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Old 02-28-2002, 02:34 PM   #1
Scooby Newbie
Member#: 12021
Join Date: Nov 2001
Location: Burlington, VT
2002 Subaru WRX
WR Blue

Default Watts per channel? (Sub and Amp)

Am I going to be okay with this setup? I will have an Alpine MRD-F752 5 channel amp going to all the speakers. The RMS watts supplied by the amp for the sub is 250, but the sub I want is the Infinity Perfect 10.1D which has an RMS of 350W. Will it be bad if the wattage supplied by the amp doesn't meet the wattage of the sub? The same question applies to the other speakers as well. The amp supplies 75W to each of those channels but the speakers I will be getting will be around 90 or 100W RMS.

I would think I would be okay, because from my research it seems that most mono amps on the market (in a respectable price range) barely reach the 250W (4ohms) I will have, plus I'm only going to have one 10" when most people have at least a 12" or two 10's. What's the consensus on this?
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Old 02-28-2002, 03:03 PM   #2
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


You just have to be careful when you setup the gain etc...

The danger lies in driving the amplifier to the point of distortion, or worse, clipping.

You can kill a speaker VERY fast when your amplifier is clipping (cutting in and out because it can't provide the power you're asking it to).

In all likelihood you can do it, as 350W through that speaker is going to be pretty loud. I run an amp capable of 100 W per coil through my a/d/s/ 310rs.2, which is rated at 300W per voice coil. It works great like that AT THE VOLUME LEVELS I LISTEN TO IT.

If I were to turn it up so that I was asking the amp to use more power than it has available, I could very easily blow the speaker.

Bottom line, if you are going to run an amp of lower power than the speaker is rated for, then be prepared that if you EVER hear the amp clipping, immediately turn down the volume and/or the gain on the amp. Then LEAVE it there, and realize that level is too much, and you CANNOT set it there and expect your equipment to last.

However for the average listening level that power should be fine.
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Old 02-28-2002, 03:08 PM   #3
Scooby Newbie
Member#: 12021
Join Date: Nov 2001
Location: Burlington, VT
2002 Subaru WRX
WR Blue


cool, thanks!
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Old 03-01-2002, 10:56 AM   #4
Scooby Newbie
Member#: 15349
Join Date: Feb 2002
Location: Western Michigan
2002 Impreza WRX

Default Another Amp Question

I also am at the point of choosing the amp for my system and I am wondering what kind of wattage to get. I am thinking about this for my system:
- Infinity BassLink 200w rms powered sub in the trunk
- Infinity Kappa 60.3cs components (90 wts RMS/270 peak)
- Infinity Kappa 42.3l in rear (50 wts RMS/150 peak)
- 4 channel amp of ?? power for the speakers

Any recommendation on amps and power? Should I stick with an amp with a lower RMS per channel rating as the speakers?

Thanks for your help.

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Old 03-02-2002, 02:29 PM   #5
Scooby Specialist
Member#: 14958
Join Date: Feb 2002
Chapter/Region: VIC
Location: Vancouver, BC
1991 318is


Yeah, if your amp's wattage isn't as high as the RMS wattage on the sub, it isn't bad at all, it just won't play to the "max" it can perform at. Remember, there's RMS wattage, and peak wattage. You should consider an amp that at least meets RMS wattage to benefit fully and get your money's worth.
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Old 03-02-2002, 09:19 PM   #6
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Member#: 12820
Join Date: Nov 2001
Default depth!

I'm not to sure if the components will fit in the door space if thats what your planning! Just give you a headsup before you buy anything! If you de get something close to the quality of kappas let me know! Good luck!
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Old 03-03-2002, 04:35 AM   #7
Scooby Specialist
Member#: 13533
Join Date: Dec 2001
Location: N37 39* W122 3*
04 sti


it's good you bought or was thinking of speaker first, then getting an amp.

kinda like buying a car then spec'ing a set of rims and tires. not the other way around.

so, if it were me, i would err on the side of more power than less. you could always pot down the level of the amp, which is better than potting UP.

you're halfway there on building a cool system. dont cheapen out by buying cheap amps. if you cant afford all the amps, buy one to power the main speakers.

heck, if it were me, i'd ditch the rear speakers all together. have a 3 channel setup. 2 kick ass speakers up front and 1-2 great subs...
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