Amp and wire size advice? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-26-2011
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Amp and wire size advice?

Ok, so ill try not to make this confusing. Ive had one sub in one of my old trucks before, and i miss having that little bass. So i picked up a couple 10" subs recently.

Im planning on building a box tomorrow, finally figured out all the numbers that were needed. Went through all the sub box photos on here too, so i guess i gotta figure out if i want two seperate boxes or one box. But anyways on to the questions.

The subs are alpine swe-1043 10" e. The numbers on the box say they are 750 watts peak, 250 watts rms and 4 ohms. What kind of a amp is needed or recommended? Also for the wire size to power it up and ground it are needed for the amps that will be rec.? Oh, one last question for now, i read somewhere that its better to run the rca cables away from the power wire when running them to the front area, is this true or false?

Thanks and sorry for the newb questions!
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Old 12-26-2011
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you have 2 of those subs?
wired together your going to have 2ohms so your gunna want an amp that puts out 500 watts at 2ohms.
you always look at the RMS rating. if you did a 2 channel amp you would wire them seperately, one per channel, and so you want something close to 250 x 2 @ 4 ohms

if thats the only amp your running and dont have any plans to add on later--4 awg is plenty. but if your going to add on later, id say do 2 or 1 awg.

and question about RCA cables is true. you can get interference with the power cord and the RCA cables. you want to run your RCA's on the opposite side of the car from the power cable
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Old 12-26-2011
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i did a quick search for amps, i dont kno what your budget calls for...but this amp would be a good match up for the money.

http://www.crutchfield.com/p_500MRPM....html?tp=35834
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Old 12-26-2011
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Kris03 - I was looking at that amp actually. Read good reviews about it and noticed two ppl in the many reviews i read had two of the alpine e's also. And no i won't be adding on later. So with that amp in the link you mentioned would you wire them up together if im reading your comment right? Sorry if i read wrong. Together meaning pos to pos and neg to neg?
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Old 12-26-2011
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ya i understand i can be confusing sometimes. with a monoblock amp-which i prefer- your going to wire up the subs together (pos to pos and neg to neg) and then plug one of the subs into the amp. 12 awg speaker wire will be plenty and 4 awg from the battery to the amp.

http://a248.e.akamai.net/pix.crutchf...4-ohm_mono.jpg


and yea thats a popular amplifier. alpines good stuff
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Old 12-26-2011
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Sounds good, thats what i was figuring out how to wire it up anyways but good to hear.

Oh, What about fuse size for the power wire. Ive read many different ways to figure it out. Couple ones that repeated itself was to take your current watts on the amplifier, so if its 500 watts divide it by your battery charge. Another way was to go 10 percent over the one supplied on the amplifier itself? Also read to put the fuse about the engine battery.

Thanks again.
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Old 12-26-2011
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You want to put it within 3 feet of the battery.
Id say 60 amp fuse should be good. (the amp's fuse is rated up to 60a)
but yes take your wattage and divide by your battery voltage which is usually 14.4 or 14.3. to be really accurate you want to know the amp's efficiency rating but i dont think you need to get that crazy with it.
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Old 12-26-2011
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Ok that should be it for the amp and wire questions, thanks for the help!

Know much about boxes? Just like 2 questions at the most :) If not ill write a new thread up.

Last edited by BigD09Ranger; 12-26-2011 at 08:57 PM. Reason: Added a point.
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Old 12-26-2011
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no problem at all!

i know some stuff. what you got?
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Old 12-26-2011
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So ive got a design for a seal box, I got all the measurements figured out to build it a few ways. But how do you figure out how to build a ported box? If its not too hard to explain or if you need of a website that helps a newb for gaining this info? Ive found site but too much numbers. Or does a ported box not make that much of a difference?
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Old 12-26-2011
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i didn't do much research with ported boxes, i did a lot with sealed because i like the sound better but i do know they have to be larger than sealed. for those subs i believe its 1.35 cu ft instead of 1 cu ft for sealed. thats per sub so 2.7cu ft. i couldn't find anything about the size of the port though.
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Old 12-26-2011
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the manual for the subs shows .23 cu ft for the vent. they give some recommended dimensions.
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Old 12-26-2011
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Yah i can't go much bigger than what i got planned out. So I'll stick with the seal box plan. Ok thanks again for the wiring help and all that! I'll check out that amp tomorrow, see if they have deals and sales on still.
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Old 12-26-2011
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yea they should have some deals still...and yea i think youll be happy with the 2 sealed.
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Old 12-27-2011
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Old 01-12-2012
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I would run wiring that is recommended for that amp. I have a Polk amp and it requires at 4awg, which happens to be the biggest it can take.
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Old 01-13-2012
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Its always best to run an amp that has more power then you need for multiple reasons.
Mainly for preventing clipping and providing dynamics. go bigger then you think you need. trying to match specs will give lackluster performance.

4 awg is more then enough to handle everything that the rangers electrical system can provide.
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Old 01-17-2012
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you can run a 2 or a 1 channel amp if you got 4ohm dvc subs you want the amp to be pushing 250w 2ohm x2 or 500w 2ohm.... i would run 4awg for power and ground.. try spacing the rca and power wire because you will start getting noise.
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