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  • #31
    I'm trying to decide on speaker purchasing right now. I was all set to buy a couple of DLs, until I got to thinking about those Selenium 12s. I could build a really nice 3ft^3 box for one of those...
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    • #32
      Unles you're going to try to build some kind of ultralight box, I'd go with the Seleniums.

      I'm considering a 1x12 with one of those to compliment my DL cab.

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      • #33
        My 2x15 isn't ported and it's farting. It has brand new speakers. Would it benefit from being ported, and if so, how should I go about doing so?
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        • #34
          Here's an interesting question: If I'm building two cabs to compliment one another, is there a way to custom match the boxes in terms of sound and response?
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          • #35
            Originally posted by zenfascist
            My 2x15 isn't ported and it's farting. It has brand new speakers. Would it benefit from being ported, and if so, how should I go about doing so?


            If it's farting because the speakers are bottoming out or overextending, porting will only make the problem worse.


            Right now the air pressure in the cab is trying hold the speakers in place against the force of the motor. If the cab is ported, that pressure will no longer exist and the speakers will be able to move more freely.


            I'd suggest that you figure out where the distortion is coming from before doing anything.

            What sort of speakers are they?

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            • #36
              Originally posted by Crescent Seven
              Here's an interesting question: If I'm building two cabs to compliment one another, is there a way to custom match the boxes in terms of sound and response?
              C7



              You can use ISD to see what the response of the two cabs would beand see where the overlap is. Assuming the cab efficiencies are matched(see below), you will get a 3 dB increase in the range where the two cabs' responses overlap.

              You can also use the speaker sensitivities to determine the correct number of drivers for each enclosure.

              Suppose you build a 1x15 cab for a Peavey Scorpion and then want to add a 2x10 loaded with Eminence Deltas to compliment it. The Peavey is a very efficient driver(99dB) and will be very loud on its own. The Delta 10 is only 95 dB, so you will need to have a cab loaded with two Deltas to match the level of the Scorpion.

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              • #37
                Thanks for the questions, guys. You just reminded me that I need to do a sealed versus ported discussion and a bit about dB increases with both additional speakers and additional watts.




                Sealed Versus Ported



                This is far better than I could do and really gets into more information than most people want, but it's worth reading nonetheless.

                There is a chart near the bottom of the page with the pros and cons of each design.

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                • #38
                  Increasing Power


                  The equation for the decibel increase for an increase in power is

                  10 * log(p1/p2)

                  Where P1 and P2 represent the power values.

                  For instance, if I want to calculate the volume difference that I'll get when I go from 100 watts to 200 watts, it would look like this:

                  10 * log(200/100) = 3.01

                  When you double power, you get a 3 dB increase in volume.

                  3 dB is an apparent increase, but to double the perceived output, there must be a 6 to 10 dB increase.

                  To get 10 dB, you'd need to increase the power by a factor of ten.

                  10 * log(1000/100) = 10

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                  • #39
                    Adding Speakers


                    Every time you double the number of drivers that you have, you will increase the output by 3 dB.

                    So, if you have an Aguilar GS112 and you believe their specs, you'll have a cab that is 102 dB sensitive.

                    If you add another one, you'll get up to 105 dB.

                    Add two more and you're up to 108 dB.

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                    • #40
                      So, if you have your 4 Aguilar GS112s and an Eden WT405, here's what you'd get.

                      1 GS112 with the WT405(250 Watts at 8 ohms) would result in doubling the power over the rated 1 Watt, 8 times. Given that there is a 3 dB increase every time you double power, you'd get a 24 dB increase over the rated 102 dB, resulting in an output of 126 dB.

                      2 GS112s would get you another 3 dB, resulting in 129 dB.

                      4 GS112s would gain another 3 dB still, resulting in a 132 dB output.



                      On the other hand, you could just go with a bigger amp.

                      Same cabs with a Genz Benz GBE1200.

                      1 GS112 and a GBE1200(550 watts at 8 ohms) would result in a 27 dB increase over the 1w/1m rating of 102 dB, resulting in 129 dB.

                      2 GS112s, 132 dB
                      4 GS112s, 135 dB

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                      • #41
                        They're Eminence Delta speakers.
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                        • #42
                          Originally posted by zenfascist
                          They're Eminence Delta speakers.



                          Damn, those are 400 Watt RMS speakers, they should not be breaking up in a sealed box.


                          What are you driving them with?

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                          • #43
                            Originally posted by burdizzos



                            Damn, those are 400 Watt RMS speakers, they should not be breaking up in a sealed box.


                            What are you driving them with?

                            An article that I read says that sealed boxes cause the speakers to break up at high volumes and that ported cabinets always sound cleaner.
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                            • #44
                              There are no hard and fast rules on that.

                              Typically, sealed boxes handle more power. However in a sealed box the speaker can be at its maximum travel at resonant frequency which will produce distortion.


                              Ported enclosures, on the other hand, have a sort of built in protection for the speaker at the tuned frequency. The trouble is that as the input goes below the tuned frequency, the driver is uncontrolled and can suffer severe damage.


                              Still, I'm curious where the distortion is coming from.

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                              • #45
                                It's not even distortion, it's that they're just, well...farting. It sounds like they're bottoming out, even with the bass turned down pretty low. The cabinet was built in the 60s or 70s, so maybe it's just constructed poorly. I'm driving them with a Traynor YBA 200 (200 tube watts). Should I just trade it in for something better, or would it be worth trying to fix? What sort of problems should I look for?

                                Thanks for all your help, burdizzos. :thu:
                                <div class="signaturecontainer"><font size="1">Official member of the HCBF DeezNuts Club</font> <br />
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                                <br />
                                <font size="1">Come on dudes lets all just smoke some crop and watch The Magic School Bus. Ms. Frizzle is the shizzle. - DanTolen</font><br />
                                <br />
                                <font size="1"> Playing with a pick is like throttling yourself with a belt and blowing hot air on your balls with a hairdryer while you masturbate - sometimes it's just the only way to get the job done. - FreestyleIntruder</font></div>

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