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How many amps for 2 subs?

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  • How many amps for 2 subs?

    I'm looking to get 2 Rockford Fosgate R2D2-12 subs. They run at 500 watts max and 250 watts RMS. I know that there not that good but its what I can afford. I was just wondering how many amps I would need for these 2 subs and what brands and models people would recommend.
    Heres the link
    http://www.rockfordfosgate.com/produ...n_US&p_status=

  • #2
    If your wanting to go for a dual sub set up. Its easiest to go for a Single amp to run the both of them. If your subs are rated to 500w each, then you can run a 100w amp for them, but it won't hurt them if you run an amp with less power. I would suggest to go for a 800w or so, you then have some head room. The less power the amp can put out the less they will be boomy. Having 2 subs is a lot They won't be punchy but more of a boomy sound. But you will have a lot more power in the if you really like bassy music. and if you have a sedan you will need this.

    I can't really comment on many brands as every single one of my systems I've built have been using Pioneers gear. I currently have their new amps in my car and to me they work fine, but i also don't like to miss match my equipment. I've also spend a considerable of money with them one of my systems had 5,000w rms, 3000w of that was in 1 sub , so i know their gear is excellent and up for a good challenge.

    You will also have to take into account that you will need a head unit with RCA pre outs. plus you will need to get some RCAs. I would suggest to also upgrade your speakers and put an amp on them too. First thing i always do. Amp up your speakers then add a sub to it. Other wise your whole system will be bass and nothing else. although i would say you should have already thought of that if you're wanting to put a sub in your car

    Hope that sort of helps
    Jay
    GTAusMotive

    2008 Honda Civic Type R, Honda Accord Euro CL9
    1991 Honda Civic Gli, 1977 Honda Civic 2 Speed Hondamatic Auto, Mini-Me Ed Civic

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    • #3
      Just run 1 amp, running two will cost you more money coz you have to buy ANOTHER amp, and more wires.



      My advice is dont buy a 4 channel and bridge it, or a 2 channel amp, you wont get the power and frequencys you want.

      What you need is a Monoblock that is 2Ohm stable, (most monoblocks are, but just ask to make sure)

      This way you run both subs off ONE channel at 2Ohm impedence, it will increase the load and you can draw more 'boom' from your subs.
      More power = More Bass.

      This also means that you could buy a slightly lower powered amp than you would if you bought a 2channel/4channel amp but still get lots of power out of it.
      My 1994 Pulsar on MightyCarMods Forum

      My 1994 Gunmetal Silver N14 SSS Intro and Build on PGA

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      • #4
        i run 2 10" subs off a 300w 2 channel amp they can go loud enough to make my house shake when i was fiddling in the driveway
        "Is it weird this gave me a Rageboner?"

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        • #5
          Yeah i second this. I right now have 2 12 Xplodes, a Pioneer and Fusion AMP ( dont know what they are ), and a Pioneer deck. I wanna upgrade everything, Like run 2 Pioneer 12's off a single Pioneer AMP and a Touchscreen Pioneer deck. So any help in what direction or brand i should go, please point .

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          • #6
            just a personal preference, but i prefer to run two subs off a mono block with the subs linked in series. so if its a 2ch, bridge the channels, run to one sub the link that output to the next sub. in theory, higher the impedance the higher the SQ, lower the impedance the higher the SPL. so theoretically if you're running lower powered subs it would be best to run the monoblock in series with a sealed & divided box.

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            • #7
              The only correct answer is in fact 3, or 5. This entirely depends on your point of view.
              Originally posted by deadcell96
              It's like Underground 2 all over again.
              Originally posted by jmacman12
              ...but, but he's got such a good star rating!!

              Disclaimer: Under NO circumstance should anybody replicate any actions I did. Seriously. Don't.

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              • #8
                You can either run a single or double, a single is cheaper and easier though and easier to place and run wires to. You're best off with a 500Watt RMS amp. NEVER go by what the peak power is, only ever go by what the RMS is or you'll blow your sub. 500Watt is peak power usage, where as 250Watt is the rated power usage. 99% of the time when you buy an amp the power output advertised should be RMS, if it's not it's almost like false advertising. If you're running 2 x 250Watt RMS Subs, you need a 500Watt Monoblock amp. Any more power than that and you'll almost certainly void your warranty and can easily blow the subs.

                With most Monoblocks they come with the capacity to connect 2 subs, so you shouldn't have to connect more than one cable per terminal on the sub. The way Monoblocks work when they have 2 connectors and 2 subs connected is that the total power is divided by the number of speakers you have, so a 500Watt with 2 x 250Watt subs connected will give each sub 250Watts.

                Again, I can't stress enough, more than 500Watts RMS for your setup is completely pointless, anyone trying to sell you on more than that doesn't know what they're talking about. Here's a link to a really good quality 500Watt RMS amp. You pay for the quality, but just take a look at some of the diagrams and read through the instruction manual. If you have any doubts it should clear everything up for you.

                http://mobile.jlaudio.com/products_amps.php?amp_id=439
                Last edited by pau13z; 28-02-2011, 01:06 PM.

                Comment


                • #9
                  ive heard only good things about JL

                  the funny thing is RF's arnt as good as there talked up to be... i found they lacked precision when loud and a bit over priced.

                  if your on a budget for subs & amps id check our jay car there gear is really well priced and there subs hit pretty hard (if boxed correctly)

                  i wouldnt bother with 2 12" if it means sacrificing quality, better off buying 1 sub & decent amp & spending the same as you would on a pair.


                  brands to look at when buying subs & amps.

                  Jaycar - The best budget gear you will find in amplifiers
                  - There subs hit pretty hard for there price

                  Boston Acoustics - pro series & comp series subs some of the best ive heard.
                  - Z Ref Series are Phenomenal

                  Audison - The best amps on the face of the earth but they are $$$$$$$

                  Crossfire - There stuff is much like Kicker and MTX it's all American, it's all loud and big and can handle a flogging but delivers a more loud sound over precision.

                  MTX - See Above

                  Kicker - See Above

                  Focal - The infamous speaker creators are known for top quality component sets and are a good price for performance. There Utopia series are superb but about $1700 a set.

                  Rockford Fosgate - Much like MTX and other American places. Loud and good but lack precision in the search for volume.

                  Fusion - Average gear and well priced accordingly. There subs are not too bad. they have some really nasty products in the line up.(The Newer Full Range Series) i prefer there older gear to the newer. very nice HU's

                  JL Audio - There subs and splits are impressive and well priced.

                  Orion - Top subs and there amps are quite goodly too.

                  Cadence - Much like Hertz and only been in the country 6 mths they are making some nice gear and have a budget solution to suit all people. Nice looking gear and a good build quality indeed. Also do a flagship level range that is all very nice gear.

                  Sony, Pioneer, Kenwood - All make good HU for the price, speakers i find don't last to long if you give them a hammering all the time.... i got 6 months out of a pair of bottom of the line pioneer's once. xplod subs are loud & have some punch but lack precision, kenwood subs are not bad for the price, pioneer they make a decent sub but amps seem to be lacking a bit, i currently have 2 10" pioneer's & they have lasted almost 5 years.
                  Last edited by Wallie; 28-02-2011, 11:13 AM.
                  "Is it weird this gave me a Rageboner?"

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                  • #10
                    The best amps i ever bought were the Pioneer ICE amps. 1200w each and they never got hot, after a long drive they were still cold as. They did cost a bit as they were a direct import from the states. but seriously best amps ever.

                    Cadence have been in the country way longer than 6 months. I had a friend with a soft top mazda and he had full cadence gera in there. Man that stuff kicked. that was a good 4 years ago now. the only problem with cadence is they don't make a head unit to sell in aus. at least last time i looked they didn't.

                    If your going for pioneers stuff, go for the higher end. Its so much nicer. I have pioneers top of the range carbon kevlar speakers in my car. Even before a sub they sound amazing. But it cost me a bit of money for my whole set up. but now its done im not regretting it. but if cost is a factor, then go for the step down. their base stuff is ok but won't last the distance if you pump them all the time. and sound quality isn't as good.
                    Jay
                    GTAusMotive

                    2008 Honda Civic Type R, Honda Accord Euro CL9
                    1991 Honda Civic Gli, 1977 Honda Civic 2 Speed Hondamatic Auto, Mini-Me Ed Civic

                    Comment


                    • #11
                      There's a mix of correct info in here. Basically yes, get a 500W amp as you go off RMS power. A single amp is all you need, monoblock is easiest but bridging is possible too. Also it doesn't need to have 2 output terminals you can just twist the wires together well and preferably solder them.

                      However there's one thing to be aware of which is that you appear to have dual voice coil, 2ohm per coil subs. So you need to get it wired correctly and an amp rated correctly.

                      Most amplifiers won't run 1 ohm (although theres a jaycar one below that will), so you need to configure for either 2 ohms or 4 ohms.


                      So what you want to do is connect each sub itself in series (so wire through 1 input, then the output of 1 voice coil into the input of the other, then the output, out).. this gives you essentially a 4ohm subwoofer.

                      Then you can wire the two subwoofers in parallel, 2 inputs together, 2 outputs together, this then halves the 4ohms, to 2 ohms. Then you have a 2ohm load.

                      The advantage of that is most amplifiers are cheaper/easier to get 500W from at 2ohms than 4 ohms.


                      You could go many brands.. here's a few examples.. generally you're looking at 500W @ 2ohm in the specifications .. and for "RMS" not "Peak"

                      http://www.elite-electronics.com.au/...roducts_id=194
                      http://www.elite-electronics.com.au/...roducts_id=282
                      http://www.elite-electronics.com.au/...roducts_id=437
                      http://shoppingsecure.com.au/index.p...d&productId=40


                      You could also go down to your local stereo shop and ask them to help you out.. 2x250W is probably plenty.. i had 2x300 eclipse (few year old model) (admittedly I dialed out a 1000W amp into them :P) and it was just shy of making my ears hurt and not much point going louder than that :P So should beat OK.

                      General advise is expect to pay $150-$400.. anything cheaper for an Amp will be crap unless of course its second hand.. keep an eye on out mobile electronics australia or your local car club for some amps up for sale, plenty of money to save there, just check the specs!
                      Mitsubishi Legnum --- 2.5L V6 Twin Turbo AWD Wagon!

                      Comment


                      • #12
                        I still maintain you need 3..... or 5.
                        Originally posted by deadcell96
                        It's like Underground 2 all over again.
                        Originally posted by jmacman12
                        ...but, but he's got such a good star rating!!

                        Disclaimer: Under NO circumstance should anybody replicate any actions I did. Seriously. Don't.

                        Comment


                        • #13
                          I live in the states so the import cost won't be a problem.

                          Comment


                          • #14
                            if you were in aus id say check out http://www.ryda.com.au/ they have quiet a few brands & a bit cheaper than in shops.


                            yes cadence have been around a bit longer & still dont make a HU.. what i put up was a few years old (i posted on another forum) sorry should of mentioned that.. haha..

                            look up a brand Audiopipe there an american brand rather small but have a pretty good range of speakers & subs.. i had a pair of 6.5" 300w 3-ways & they took a fair amount of abuse til i sold them with the car. there 12" subs are 375W RMS, 750W

                            Last edited by Wallie; 28-02-2011, 01:29 PM.
                            "Is it weird this gave me a Rageboner?"

                            Comment


                            • #15
                              Originally posted by debater96 View Post
                              I live in the states so the import cost won't be a problem.
                              well I have a car audio shop and basically everything "LATHIAT" said is exactly correct. Have you bought the subs yet? I have a few amps thats would be perfect for your set up for a good price, and if you havent bought the subs yet I got those for cheap too.

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