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  • Ohms question

    Ok...so I think that I am getting a hold on how all of this works....

    I am definitely buying 2 KDC-W3011's no question...and I want to stay low in the price, so i think im going with a MD 2622...

    The problem...

    The Amp runs at 2 ohms, and the subs require 4 ohms...

    Now I know that ohms are resistance, and that less ohms means more power, so more power from the amp to the subs will not be good I don't think...I DO NOT WANT TO BLOW ANYTHING...AT ALL ...So I know that resistors can increase the number of ohms, but I would like to make this as simple as possible...

    any help would be greatly appreciated...

  • #2
    amp can run at 4ohms. if u have 2 subs, hook them in parallel so they will be 2 ohms.

    Comment


    • #3
      Originally posted by rgarjr View Post
      amp can run at 4ohms. if u have 2 subs, hook them in parallel so they will be 2 ohms.
      wait so you can set the amp to run at 4 ohms.... and i meant that each sub is 4 ohms, not that both subs together would equal 4 ohms....

      sorry if i misunderstand you, but i (very amateur at this) am seeing what you are saying as if they are both on the same signal, then they would only need 2 ohms (if the subs were each 2 ohms)...but the subs are each 4 ohm subs....

      Thanks for your help...a lot.....I hate when i post and no one even posts back...

      Comment


      • #4
        oh...well stupid me decided to reply without doing research, so now I understand what you are talking about with it decreasing the ohms, because it will be a 2 ohm load....gottcha...but because my amp is a 2 channel, and I will be running only one channel to both subs, would it be bad to bridge the connection...sorry if it is a stupid question...just want to get the most out of what I buy


        Thanks again

        Comment


        • #5
          i understand what you are saying... parallel will make a load of 2 ohms....thanks....

          One more question....If the amp is 2 channels, but I am only using one signal (because the subs will be parallel) would it be ok to bridge the connection between the amp and the first sub....if not, what would be the best way to get the most power out of my subs...should I go for another mono amp, and have a higher wattage....


          thanks....

          Comment


          • #6
            Crutchfield has a nice section that spells this out pretty well:
            http://www.crutchfield.com/learn/lea...rs_wiring.html
            xb_mini

            Comment


            • #7
              the amp says it's only stable at 2ohms in stero. meaning you shouldn't bridge the amp down to one channel. I don't think you have even thought of doing this but the subs look like they might be able to handel it. As far as both the subs and amps saying they will handel 1200watts peak. don't expect to hear anything close to that.

              I personally have never herd of the MDsound name. But i have been out of the game for some time. For the price i know power acoustik has been around for much longer and they have always had alright amps that hit pretty hard. the ov2-1250 would be my choice for a model in that price range. It is rated to output a higher wattage and there are rating of it bridged as well. But with higher wattage you have the chance of blowing a speaker... so it's your call.

              Comment


              • #8
                It looks like your subs are 400w RMS a piece. When looking at speakers and amps, you want to know the RMS power. This is the level that the amp and subs can sustain. The 1200w you saw was peak level, which would probably never be reached on a generic amp.

                I know that you wanted to save money on your amp, but you would be better off if you got a better quality amp with less advertised power(but more actual power). This mono amp is rated at 800w RMS at 2 ohms, but 2400 peak. It's $300, but it is an investment that should last longer than your subs if you take care of it.
                xb_mini

                Comment


                • #9
                  Even though you have 2 subs, you can still use a mono amp. You will get more out of your amp this way.

                  2 ohm stable means that you can go as low as 2 ohms. I don't think I have ever seen an amp that can't do 4 ohms(higher is easier).
                  xb_mini

                  Comment


                  • #10
                    Originally posted by daveczrn View Post
                    I personally have never herd of the MDsound name.
                    Ya neither have I...but I read some reviews on the product, and people were saying how they were shaky at first cause of the no namer title, but it is a hell of an amp for the cheap price..so....

                    and...ok...so I should look for another amp....

                    And ya i def need to stay in the $100 range....so those other amps are out of the question...

                    has anyone heard of Lanzar audio....they have some way over rated ratings, but I would like to know how good they really are...

                    Thanks for everyones help btw

                    Comment


                    • #11
                      is there a way to tone down RMS for an amp...cause what if I got this


                      http://www.woofersetc.com/index.cfm?...product_id=484

                      it says that at 4 ohms, with each channel, it puts out 500 RMS, but the subs are each only 400 RMS...will this extra 100 RMS make a difference....is it hard to fix....

                      Thanks

                      Comment


                      • #12
                        have you bought anything yet? what's your total budget (for both subs AND amp)? and where are you planning to buy from?

                        the prices range quite a bit for those subs. overstock.com (the first google result) sells them for $129 each, while sonicelectronix.com sells them for $39 each. that kind of savings will leave with more money for a better amplifier

                        there's no point in buying nice subs only to power them with a garbage amplifier. take everything into consideration when planning your install, don't cheap out on 1 component and think it won't matter. don't limit the amount of money that you can spend on just the amp, limit the amount of money you can spend on the entire system. in other words; if you spend 75% of your budget on subs then you won't have enough money leftover to buy an amp good enough to power them adequately and efficiently.

                        consider using 1 sub instead of 2 if that saves you enough money to get a better amp. you'll get better sound out of a single sub with a good amp then you will out of 2 subs and a garbage amp. stay away from the typical garbage brands like Lanzar, Legacy, Pyle, Pyramid, etc.

                        remember, you can't go by peak/max wattage ratings. only pay attention to RMS ratings (if the manufacurer doesn't state the RMS output then don't even consider buying the amp). and even if they do, if it's a crap company then you still can't expect the amp to produce it's RMS rating either. only buy reputible brands, if money is very tight then check out eBay or craigslist for used/refurb amps.

                        the only site I could find that lists the RMS output for that MD2622 amp states 120w x2 @4ohms, 150w x2 @2ohms, or 300w x1 @4ohms. those specs are shady at best. normally, when you cut the impedance in half you double the amplifier power output. with that amp you only gain 30 more watts? hmmm...

                        I use a Kicker ZX400.1 400w RMS mono amp to power a single 10" Infinity kappa (that amp can handle more than that, but I'm long since out of high school and have no need for earth shaking bass anymore. I used to use it to power two 12" MTX Blue Thunder Legends and it handled them with ease). Kicker is one of the few amplifier manufacturers that actually under-rates their power output specs. my ZX400.1 was "tested" at the factory and came with a certificate stating that it will produce 429w RMS (that's 29w more than it's rated for ). I bought the amp on eBay for about $100. I'm not saying you need to buy this amp, byt I use one myself so I can recommend it for it's price, size, and quality. it is half the size, more effeicient, and will output more power than the MD2622 amp you were looking at.

                        whatever you decide, good luck
                        F150 Truckputer [1.0] (coming soon!)
                        Fusion Carputer [2.0]
                        Fusion Carputer [1.0]

                        Comment


                        • #13
                          I completely understand your point about the price, but I think it would be worth the extra money, even if you went with a less powerful amp.
                          xb_mini

                          Comment


                          • #14
                            Everything that FusionFanatic said was beautiful.
                            xb_mini

                            Comment


                            • #15
                              Originally posted by FusionFanatic View Post
                              have you bought anything yet? what's your total budget (for both subs AND amp)? and where are you planning to buy from?

                              the prices range quite a bit for those subs. overstock.com (the first google result) sells them for $129 each, while sonicelectronix.com sells them for $39 each. that kind of savings will leave with more money for a better amplifier

                              there's no point in buying nice subs only to power them with a garbage amplifier. take everything into consideration when planning your install, don't cheap out on 1 component and think it won't matter. don't limit the amount of money that you can spend on just the amp, limit the amount of money you can spend on the entire system. in other words; if you spend 75% of your budget on subs then you won't have enough money leftover to buy an amp good enough to power them adequately and efficiently.

                              consider using 1 sub instead of 2 if that saves you enough money to get a better amp. you'll get better sound out of a single sub with a good amp then you will out of 2 subs and a garbage amp. stay away from the typical garbage brands like Lanzar, Legacy, Pyle, Pyramid, etc.

                              remember, you can't go by peak/max wattage ratings. only pay attention to RMS ratings (if the manufacurer doesn't state the RMS output then don't even consider buying the amp). and even if they do, if it's a crap company then you still can't expect the amp to produce it's RMS rating either. only buy reputible brands, if money is very tight then check out eBay or craigslist for used/refurb amps.

                              the only site I could find that lists the RMS output for that MD2622 amp states 120w x2 @4ohms, 150w x2 @2ohms, or 300w x1 @4ohms. those specs are shady at best. normally, when you cut the impedance in half you double the amplifier power output. with that amp you only gain 30 more watts? hmmm...

                              I use a Kicker ZX400.1 400w RMS mono amp to power a single 10" Infinity kappa (that amp can handle more than that, but I'm long since out of high school and have no need for earth shaking bass anymore. I used to use it to power two 12" MTX Blue Thunder Legends and it handled them with ease). Kicker is one of the few amplifier manufacturers that actually under-rates their power output specs. my ZX400.1 was "tested" at the factory and came with a certificate stating that it will produce 429w RMS (that's 29w more than it's rated for ). I bought the amp on eBay for about $100. I'm not saying you need to buy this amp, byt I use one myself so I can recommend it for it's price, size, and quality. it is half the size, more effeicient, and will output more power than the MD2622 amp you were looking at.

                              whatever you decide, good luck
                              YES!...thankyou....if there is a rating members feature on this forums then please point me to it so that I can give you the best one possible....buying those subs cheap would be great, because I am planning on trying to stay around $500...$600 absolute max...That will definitely clear some space for a higher quality amp...I also really would like to use a xovision 7" touchscreen H/U, which is $200 from walmart (usually $268), plus I would like 2 of the kenwood subs, and the wires would cost a good bit also....

                              I have not bought anything for the system yet, and probably will not for a good while...months maybe...but I would like to just have a shopping list of exactly what to buy from where and how much so that when I do get everything, there will be minimal issues, and I can focus on the install and box building....

                              Many people say that a system should be heard not seen...i say why not both...

                              I am planning on buying a rather eye appealing "wall" for say, and will probably go with a sealed box for each sub....but I plan on mounting them inverted because I love the way they look and think that the KDC-W3011's would look sick inverted, and with the great ratings from customers, and very low cost, I figure that I cannot go wrong....

                              Thank you all so much...Words cannot describe how godly smart you guys are...

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