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  • matching speakers to amps

    K, i hope this will be the final question before we decide to buy our PA system.

    How do I go about comparing speakers and being able to match them with the amps. I have read some general guidelines for choosing the amps and speaker combinations but dont really remember them. Can someone explain this??
    <div class="signaturecontainer">My band's website:<br />
    www.running-blind.com<br />
    <br />
    pushing a 4x12 is like waking up one day and the clouds in the sky splitting, and suddenly you stand <br />
    triumphant on the hood of your Dodge Stratus and realize that YOU are a GUITARIST!<br />
    <br />
    &quot;i have read a step by step way to get the &quot;korn&quot; sound:<br />
    1. get a plastic bag<br />
    2. poo in it<br />
    3. wave it around your head while singing i'm a little teapot&quot;</div>

  • #2
    Since this is a relatively new area for you, you'd be well advised to pick your speakers and then check back here for advice on how much juice and which specific amp to use.

    To answer your question, a good rule of thumb would be to apply 1 X to 1.5X the rms rating of the speaker. The novice user should use 1x....the more advanced user (with limiters in place) can apply 1.5x (and beyond) rms speaker ratings.
    https://www.facebook.com/pages/Full-Steam/179028619290

    Comment


    • #3
      the speakers I am looking at are
      JBL MP225 - they have a continuous power rating of 500w, and a peak of 2000

      the subs are JBL MP255S, I cannot find the ratings for the subs on MF.com

      The amp for the mains we are looking at is a Mackie M2600...
      <div class="signaturecontainer">My band's website:<br />
      www.running-blind.com<br />
      <br />
      pushing a 4x12 is like waking up one day and the clouds in the sky splitting, and suddenly you stand <br />
      triumphant on the hood of your Dodge Stratus and realize that YOU are a GUITARIST!<br />
      <br />
      &quot;i have read a step by step way to get the &quot;korn&quot; sound:<br />
      1. get a plastic bag<br />
      2. poo in it<br />
      3. wave it around your head while singing i'm a little teapot&quot;</div>

      Comment


      • #4
        Originally posted by Themetallikid
        the speakers I am looking at are
        JBL MP225 - they have a continuous power rating of 500w, and a peak of 2000

        the subs are JBL MP255S, I cannot find the ratings for the subs on MF.com

        The amp for the mains we are looking at is a Mackie M2600...
        Read the last couple replies in the TRX thread. I wouldn't run over 500-600 watts through them.
        <div class="signaturecontainer"><a href="mailto:tlbonehead@yahoo.com">tlbonehead@yaho o.com</a><br />
        <a href="http://www.myspace.com/tbone_tommy" target="_blank">www.myspace.com/tbone_tommy</a><br />
        -For Sale: <br />
        -set of GFS Dream 90s- gold and black pearl- $40 shipped in the cont. US<br />
        -(2) Celestion G12M-70 16 ohm guitar speakers in good condition $40 ea. + shipping.<br />
        - Vox VT15 Valvetronix very clean - $85 + shipping<br />
        - Hughes Kettner Edition Tube 20 (the early Voxy sounding one) Sounds &amp; looks good. $250 + shipping. <b>SOLD</b><br />
        - Crate Palomino V8 - 10&quot; Celestion - Very clean - on Ebay (sold)</div>

        Comment


        • #5
          I'm not as knowledgable as some here, but the amp looks okay for those speakers to me. Seems to me 4x15 with one horn per side, isn't going to give the best sound you could get for the money though.

          Comment


          • #6
            how do you figure 4 x 15. What speakers would you recommend for around $600 each? using the amp I mentioned the Mackie M2600
            <div class="signaturecontainer">My band's website:<br />
            www.running-blind.com<br />
            <br />
            pushing a 4x12 is like waking up one day and the clouds in the sky splitting, and suddenly you stand <br />
            triumphant on the hood of your Dodge Stratus and realize that YOU are a GUITARIST!<br />
            <br />
            &quot;i have read a step by step way to get the &quot;korn&quot; sound:<br />
            1. get a plastic bag<br />
            2. poo in it<br />
            3. wave it around your head while singing i'm a little teapot&quot;</div>

            Comment


            • #7
              Originally posted by Themetallikid
              how do you figure 4 x 15. What speakers would you recommend for around $600 each? using the amp I mentioned the Mackie M2600


              2 x 15 in each main, and 2 x 15 in each sub. I'm going to leave specific recommendations to those with more knowledge. Personally, I prefer 3 ways to 2 x 15.

              Comment


              • #8
                Originally posted by GCDEF
                I'm not as knowledgable as some here, but the amp looks okay for those speakers to me. Seems to me 4x15 with one horn per side, isn't going to give the best sound you could get for the money though.
                415 is just the model. They are the high end MP single 15" 2-way cab. I believe they also have a 215 or something with lighter drivers.
                <div class="signaturecontainer"><a href="mailto:tlbonehead@yahoo.com">tlbonehead@yaho o.com</a><br />
                <a href="http://www.myspace.com/tbone_tommy" target="_blank">www.myspace.com/tbone_tommy</a><br />
                -For Sale: <br />
                -set of GFS Dream 90s- gold and black pearl- $40 shipped in the cont. US<br />
                -(2) Celestion G12M-70 16 ohm guitar speakers in good condition $40 ea. + shipping.<br />
                - Vox VT15 Valvetronix very clean - $85 + shipping<br />
                - Hughes Kettner Edition Tube 20 (the early Voxy sounding one) Sounds &amp; looks good. $250 + shipping. <b>SOLD</b><br />
                - Crate Palomino V8 - 10&quot; Celestion - Very clean - on Ebay (sold)</div>

                Comment


                • #9
                  Originally posted by tlbonehead
                  415 is just the model. They are the high end MP single 15" 2-way cab. I believe they also have a 215 or something with lighter drivers.


                  The model numbers he posted are for 2 x 15 mains and 2 x 15 subs.

                  http://www.zzounds.com/item--JBLMP225

                  http://www.americanmusical.com/item--i-JBL-MP255S--brand-133.html

                  Look at the frequency response on the mains.

                  Frequency Response: 42 Hz - 11 kHz (+/-3 dB)

                  Comment


                  • #10
                    Originally posted by GCDEF


                    The model numbers he posted are for 2 x 15 mains and 2 x 15 subs.

                    http://www.zzounds.com/item--JBLMP225

                    http://www.americanmusical.com/item--i-JBL-MP255S--brand-133.html

                    Look at the frequency response on the mains.

                    Frequency Response: 42 Hz - 11 kHz (+/-3 dB)
                    Oops,don't know where I got that he was referring to the MP415. Yes,I'm sure everyone here will agree that it would be a very poor choice for a setup. I'd get the subs with their higher end single woofer cab instead. The MP415 that I actually was eluding to.
                    <div class="signaturecontainer"><a href="mailto:tlbonehead@yahoo.com">tlbonehead@yaho o.com</a><br />
                    <a href="http://www.myspace.com/tbone_tommy" target="_blank">www.myspace.com/tbone_tommy</a><br />
                    -For Sale: <br />
                    -set of GFS Dream 90s- gold and black pearl- $40 shipped in the cont. US<br />
                    -(2) Celestion G12M-70 16 ohm guitar speakers in good condition $40 ea. + shipping.<br />
                    - Vox VT15 Valvetronix very clean - $85 + shipping<br />
                    - Hughes Kettner Edition Tube 20 (the early Voxy sounding one) Sounds &amp; looks good. $250 + shipping. <b>SOLD</b><br />
                    - Crate Palomino V8 - 10&quot; Celestion - Very clean - on Ebay (sold)</div>

                    Comment


                    • #11
                      Originally posted by Themetallikid
                      t

                      The amp for the mains we are looking at is a Mackie M2600...


                      Nothing wrong with the amp but DO be aware that it needs to plug into a 20 AMP SERVICE all by itself. Now you need a distro if you are running ANYTHING else.

                      You'd have a much better sounding system if you bought two smaller amps eg QSC RMX 1850s and bi-ampped your system
                      Don Boomer

                      Comment


                      • #12
                        Nothing wrong with the amp but DO be aware that it needs to plug into a 20 AMP SERVICE all by itself. Now you need a distro if you are running ANYTHING else.


                        You'd have a much better sounding system if you bought two smaller amps eg QSC RMX 1850s and bi-ampped your system


                        My last band used this setup. We used the Mackie M2600 to power the Foh speakers and subs, and then an OSC 1450 to pwoer the monitors. we would plug that into its own circuit and run the guitar/bass amps off a different circuit along with the smaller light setup we had. we never really blew any fuses.

                        How would running the two 1850's be better than the single 2600? Is it because the power is being used solely for the tops/bottoms? are the 1850's a single channel amp? We have a budget of $5000 and its a good deal to get the M2600 for 500, and the OSC1450 for 260.

                        I'd get the subs with their higher end single woofer cab instead. The MP415 that I actually was eluding to.


                        what makes it such a bad match? as opposed to the single woofer cabs your talking about?
                        <div class="signaturecontainer">My band's website:<br />
                        www.running-blind.com<br />
                        <br />
                        pushing a 4x12 is like waking up one day and the clouds in the sky splitting, and suddenly you stand <br />
                        triumphant on the hood of your Dodge Stratus and realize that YOU are a GUITARIST!<br />
                        <br />
                        &quot;i have read a step by step way to get the &quot;korn&quot; sound:<br />
                        1. get a plastic bag<br />
                        2. poo in it<br />
                        3. wave it around your head while singing i'm a little teapot&quot;</div>

                        Comment


                        • #13
                          1> 2600 is too much power for the speakers you plan to use.

                          2> Bi-amping the system will sound way better ... excuse me
                          WAY BETTER ond offer additional speaker protection. That way if (when) you clip something (usually the subs) the top boxes will remain clean.

                          3> I'd rethink the speaker combo you picked out. 2x15/horn top isn't the best match for a 2x15 sub. How about a better quality 12' and horn or 12/6/horn something?

                          4> someday you will have current issues trying to drive the Mackie ... count on it. You probably aren't getting the hearoom you've paid for in the amp if you can't feed it enough current. Not to mention safty and noise/hum problems.

                          5> having redunduncy with the amps may come in handy some day if something blows up.

                          If you're getting the 2600 for $500 I'm assuming it's used (or hot). I bought 4 QSC 1850s on Ebay for $350 each ... new (that was a deal!). I guess there's not a bunch of used ones out there as they are a pretty new model. They will drive a 2 ohm load and have extra cooling capacity. They're the real bargin in that whole rMX line ... which are all a bargin in my book.
                          Don Boomer

                          Comment


                          • #14
                            I'm not set on getting the Mackie, just trying to understand why other options are better. I understand the bi-amp route. Seems to make more sense as well.

                            so your suggesting a pair of single 15" with a horn? or single 12" with a horn? Are the subs good enough? or something better? Our budget for speakers is probably $700 max per speaker.
                            <div class="signaturecontainer">My band's website:<br />
                            www.running-blind.com<br />
                            <br />
                            pushing a 4x12 is like waking up one day and the clouds in the sky splitting, and suddenly you stand <br />
                            triumphant on the hood of your Dodge Stratus and realize that YOU are a GUITARIST!<br />
                            <br />
                            &quot;i have read a step by step way to get the &quot;korn&quot; sound:<br />
                            1. get a plastic bag<br />
                            2. poo in it<br />
                            3. wave it around your head while singing i'm a little teapot&quot;</div>

                            Comment


                            • #15
                              Hello MetalKid,
                              Read carefully: everybody is recomending that you do NOT buy the 2x15/horn mid-high cabinets. If you're getting subs, ( and that 2x15" sub is fine), then a QUALITY 12"/1" horn (or a quality 15"/horn) mid-high cab would be good.

                              Comment



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