My Speakers 6.5 and 6x9 have 100 RMS but the Amp I'm getting has a 75 RMS x 4.

Will I be under powering the speakers, will I get the whole sound out this or I need to return the Amp and get a 100 RMS x 4

Thanks!

 

Someone can correct me if I am wrong but your 100RMS rating is the highest number your speakers can handle, RMS being constant and different than peak. Personally, I think that you should be fine.

 

seeing as how its not gonna be custom installed into pods or anything, i mean really.... your gonna be very satisfied with 75w rms per speaker.. i'm pretty sure...

 

no,
the rms watts is what the speakers want constant.
peak would be they most the can handle.

youll be fine runing 75 watts, but you normally always want to run the rms wattage to them.
what type of alpine amps is it?
if its a pdx they actually make more power per channle then what they say.
100 watts per channle would be 125.

 

Although you should have no problem powering the speakers with 75W RMS it is always better to over-power the speakers then it is to under-power the speakers.

Driving 100W speakers with 75W will work great, the issues you will and can run into are, you can not drive speakers to their full potential, you loose "dynamic head room" but worst of all is the possibility of overdriving the amp into constant clipping, that will hurt the speakers, [burn VCs].

I have replaced more damaged speakers, by far, on under-powered systems then I have on over-powered systems. 94

 

FCM, you are a guru when it comes to this section. Hell, I'll just ask you from now on, ha ha.

 

I think 75 RMS should be fine, I'd check with a multimeter what 75 RMS from your amp is on your headunit volume so you don't turn it up too high and send a clipped signal, but the difference between 75 RMS and a 100 RMS amp is like what 1-2db?

 

Thanks for the replys.

One more thing which Amp wire kit do I need 4 or 8 gauge? I will be running 2 ohm @ 110 x 4 RMS.

The street wire 8 gauge Amp kit that I was looking at says that its for 300w, but the Amp that I got is 440w.

4 Ohm @ 55 x 4
2 Ohm @ 110 x4

 

I'd recommend 4 or bigger to be honest, but if it's just the one amp, your probably ok with 8.

 

If power cable is no longer then about 8 feet you can get away with 8ga, any longer and I would use 4ga.
With that said, using 4ga can't hurt even if the cable is less then 8 feet long.

Either way, if you buy a kit, get one without the RCA(s), it/they will be too long, buy the proper length RCA(s), also make sure the kit you get has an ANL fuse and not the AGU, [big glass type] fuse.

ANL fuse... http://www.scosche.com/products/productID/827
AGU fuse... http://www.scosche.com/products/productID/778

Also, skip the "pimp my audio system" gold plated fuse holder w/set screw wire connections, and get the a simple binding post fuse holder... http://www.scosche.com/products/productID/1765.

Skip the kit and just buy what you need, fuse and holder from eBay, ring terminals, [brazed seam] from local Pico dealer, power cable from local welding shop supplier and proper length RCAs from wherever. 94

 

What happens if the RCA Cable is too long? Loss of SQ?

 

Primarily, also some of the cheaper ones that come in kits have poor or minimal shielding and tend to be more prone to that annoying alternator noise (in my experience anyway).

 

RCA cables too long.... well each 1ft of wire has its own rated resistance.. the longer your signal wire the more power or signal attenuation you will experience.. 1-2 ft extra will not hurt because face it, its highly unlikely your gonna find EXACTLY the perfect length, the industry makes general length rca's, 3ft, 6ft, 10ft, 12ft, 16ft, etc, etc ,etc

 

One last thing, which GAuge for the speaker wire 14, 16 or 18 gauge?

 

16 is fine for speakers, i have ran as large as 8gauge for subs before, but i had alot of power

 

Thank You!