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Old 01-22-2009
Waffen's Avatar
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Questions about adding an amp?

Gentlemen,

I am in the process of adding a 4 channel amp to add some power and clarity to my current setup.

Installed in my truck I currently have:

Pioneer DEH-P3100UB Head Unit
Specs:
  • 2 total 4-Volt 4 channel pre-amp's

4 total Pioneer 6"x8" TS-A6871R 3- Way Speakers. In both front and back doors.
  • frequency response: 30-28,000 Hz
  • power range: 2-50 watts RMS
  • sensitivity: 90 dB

I have just purchased a used Alpine MPR-F250 4-Channel Amp off ebay for $50. I figured that it was too good a deal to pass up, and even if the amp is crappy it's just $50.

Specs on the amp can be found here:
http://www.crutchfield.com/p_500MRPF...%2bF250&tp=115

My goal is to mount this amp somewhere in the truck and have this power all 4 of my door speakers. I was wondering if someone could tell me exactly what installation materials I will need to get this installed (i.e. give me a link to a good inexpensive install kit with everything I will need). Also if someone could give me an estimate on how much speaker wire I will need if it's not included in a kit.

I also wanted to know if this amp is too much or too little for these speakers? Everyone who I've talked to in person says you need to find an amp that is "matched" to your speakers, the only rating I looked at was the RMS rating when I was "matching" the amp to the speakers. Also will this even add any noticeable clarity over the head unit that I'm using or am I bottlenecked by my speakers?

Additionally if anyone has any other advise when it comes to wiring an amp in I am all ears.

Thanks guys!
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Old 01-22-2009
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its a great amp i have the newer bigger mrp 300 4 channel. what your going to need is a 8 gauge amp install kit, a 40amp fuse, 2 sets of rcas(spend some decent money on these like $20-50 a set, go to knukonceptz.com and order it all from there) whatever legnth you need. and probly to be safe get 75 feet of speaker wire you will have extra but that will let you run the wires cleanly. order these items: rcas 4 channel will only have to run 1 set as both front and rear or on this http://www.knukonceptz.com/productDe...odID=KARSS4.6M amp kit and you can use the rca from it for a sub amp if you ever do that http://www.knukonceptz.com/productDe...?prodID=KLM-K8 http://www.knukonceptz.com/productDe...ID=KLE12BL-100 and you will be golden their stuff is very nice and very well priced. i have been using their stuff for years and never had a problem they ship quickly actually answer the phones.
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Old 01-22-2009
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^^^ couldn't of said it better
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Old 01-22-2009
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That amp will be a good match for your speakers. You're right in comparing the RMS value of the speakers and amp, that's all you need to worry about. You can use basically any kind of amp for any kind of speakers as long as the amp is tuned so that it doesn't push the speakers too hard.. but the amp you've ordered is a very good match.

The amp probably won't add a lot of clarity at medium volumes, but it will have roughly twice the power of your head unit, and should add a lot of volume and a lot of clarity at high volume. Plus it will give your head unit a break, they get pretty hot when the internal amp is pushed.

You will need an 8 gauge wiring kit, the kit should come with everything you need except for the actual speaker wire. If you plan on ever expanding your system in the future I would go with a heavier gauge kit just so you don't have to replace it again.. I have an 8 gauge kit installed right now, and I just got a second amp so I have to upgrade my wiring to at least 4 gauge before I can install the second amp.

You can get a wiring kit at www.crutchfield.com, on ebay, or your local electronics store. The cheapest will probably be ebay. If it says "8 gauge wiring kit" it should come with everything you need except for speaker wire. And as for speaker wire, I haven't installed my amp for my door speakers yet or I could give you an estimate.. maybe use a piece of string and pretend to route it where your speaker wire will need to go, add the strings together and a little bit extra. If it was me I'd just buy a roll of 18 gauge wire and call it a day. Haha.

I wouldn't say that your system is 'bottlenecked' by your speakers, you should get some decent volume and clarity out of them when your amp is in.

Right now I'm fighting with running my 18 gauge speaker wire through the rubber grommets in the doors.. it's proving to be a PITA. Might have something to do with the fact that it's usually -15 celcius out though.

Well good luck, if you need help with the install just post, there's probably hundreds of amp installs between everyone on here. LOL
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Old 01-22-2009
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^^ beat me to it, I type slow.. my 8 gauge install kid came with the fuse, fuse holder, and rca cables.
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  #6  
Old 01-22-2009
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Quote:
Originally Posted by nicholoff View Post
its a great amp i have the newer bigger mrp 300 4 channel. what your going to need is a 8 gauge amp install kit, a 40amp fuse, 2 sets of rcas(spend some decent money on these like $20-50 a set, go to knukonceptz.com and order it all from there) whatever legnth you need. and probly to be safe get 75 feet of speaker wire you will have extra but that will let you run the wires cleanly. order these items: rcas 4 channel will only have to run 1 set as both front and rear or on this http://www.knukonceptz.com/productDe...odID=KARSS4.6M amp kit and you can use the rca from it for a sub amp if you ever do that http://www.knukonceptz.com/productDe...?prodID=KLM-K8 http://www.knukonceptz.com/productDe...ID=KLE12BL-100 and you will be golden their stuff is very nice and very well priced. i have been using their stuff for years and never had a problem they ship quickly actually answer the phones.
I ordered exactly what you linked. Thanks so much for the advise.
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Old 01-22-2009
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nicholoff , Nate,

Thanks SO much for the replies. This is exactly the kind of quality response I was looking for! You guys are awesome!
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Old 01-22-2009
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What would you suggest for door speakers? Kicker or Rockford punch?

http://cgi.ebay.ca/ws/eBayISAPI.dll?...m=130278816592

http://cgi.ebay.ca/ws/eBayISAPI.dll?...m=200297197585
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Old 01-22-2009
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I'd go with the rockfords, I've never heard either of them though.
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