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Jeff Bagby Fusion - 8 Alchemy MTM Question

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  • Jeff Bagby Fusion - 8 Alchemy MTM Question

    Jeff,

    My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

    Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

    Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

    Thanks in advance for your input!

    Kevin
    Shaken, not stirred...

    Classix II
    OS MTM's
    Digger 8 sub
    Overnight Sensations Center Channel
    Sprite Build
    Wolf's PC Speakers
    Minions III with Voxel Sub

  • #2
    Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

    Originally posted by kevin007 View Post
    Jeff,

    My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

    Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

    Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

    Thanks in advance for your input!

    Kevin
    My recommendation is to build/buy a sub to pair with it, saves on distortion, gets louder and lower. Just my .02 .

    Comment


    • #3
      Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

      My son already has 5 subs. We are covered!

      Kevin
      Shaken, not stirred...

      Classix II
      OS MTM's
      Digger 8 sub
      Overnight Sensations Center Channel
      Sprite Build
      Wolf's PC Speakers
      Minions III with Voxel Sub

      Comment


      • #4
        Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

        007,
        If he's got 5 subs, why does he/you need to tune the mains lower? If you don't change the baffle dimensions significantly there is no need to change the crossover, typically.

        Comment


        • #5
          Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

          It's because of his love of the Dayton 8's. He really wants a pair of huge skull crushing speakers. I was just thinking that it would not take much to power the fusion 8 MTM because it was so sensitive. The Dayton 8's are not very sensitive so their power requirements are a lot more.

          Or maybe building a speaker within a cabinet would work? But I was just contemplating the options...

          Kevin

          Originally posted by dld View Post
          007,
          If he's got 5 subs, why does he/you need to tune the mains lower? If you don't change the baffle dimensions significantly there is no need to change the crossover, typically.
          Shaken, not stirred...

          Classix II
          OS MTM's
          Digger 8 sub
          Overnight Sensations Center Channel
          Sprite Build
          Wolf's PC Speakers
          Minions III with Voxel Sub

          Comment


          • #6
            Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

            Originally posted by kevin007 View Post
            Jeff,

            My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

            Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

            Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

            Thanks in advance for your input!

            Kevin
            Well, the Beta8 is capable of a bit more more extension. If you built the MTM in a tower that was 2 cu ft and tuned to 56Hz (could be achieved with 2 - 3" diameter ports x 4" long) then it would extend to an F3 of 51Hz and a F6 of 46 hz. If you keep the baffle the same width the original crossover will likely work fine. But you need to keep in mind that this woofer has an Xmax of 3mm, so pushing the bass for maximum extension may not be the best idea.

            If he really wants crushing sound, that still sounds really good, then get him a pair of the Tempest kits. They have very linear response, 98dB sensitivity, and a very easy 8 ohm minimum impedance to drive, and in a living room with a good amp and multiple subs will sound like a rock concert.

            Jeff
            Click here for Jeff Bagby's Loudspeaker Design Software

            Comment


            • #7
              Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

              Jeff,

              Does Erich still have the tempest kits? I see the Karma, Fusion, and Alpha kits but none of the tempest.

              My other idea was to build the cabinet into a larger cabinet. It would look like the giant Dayton 8's but the internal volume of the speaker cab would be the same as the kit.

              What do you think?

              Kevin

              Originally posted by Jeff B. View Post
              Well, the Beta8 is capable of a bit more more extension. If you built the MTM in a tower that was 2 cu ft and tuned to 56Hz (could be achieved with 2 - 3" diameter ports x 4" long) then it would extend to an F3 of 51Hz and a F6 of 46 hz. If you keep the baffle the same width the original crossover will likely work fine. But you need to keep in mind that this woofer has an Xmax of 3mm, so pushing the bass for maximum extension may not be the best idea.

              If he really wants crushing sound, that still sounds really good, then get him a pair of the Tempest kits. They have very linear response, 98dB sensitivity, and a very easy 8 ohm minimum impedance to drive, and in a living room with a good amp and multiple subs will sound like a rock concert.

              Jeff
              Shaken, not stirred...

              Classix II
              OS MTM's
              Digger 8 sub
              Overnight Sensations Center Channel
              Sprite Build
              Wolf's PC Speakers
              Minions III with Voxel Sub

              Comment


              • #8
                Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

                Originally posted by kevin007 View Post
                Jeff,

                Does Erich still have the tempest kits? I see the Karma, Fusion, and Alpha kits but none of the tempest.

                My other idea was to build the cabinet into a larger cabinet. It would look like the giant Dayton 8's but the internal volume of the speaker cab would be the same as the kit.

                What do you think?

                Kevin
                The Tempest is the Fusion-12:
                http://www.diysoundgroup.com/wavegui...ion12-kit.html

                Other than that, I guess I don't really understand this thread, so I am not sure how to assist any further. I reckon I have no idea what the "Dayton 8" is, or how it relates to the Alchemy MTM.

                Jeff
                Click here for Jeff Bagby's Loudspeaker Design Software

                Comment


                • #9
                  Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

                  It relates to the fusion in that they are both similar sizes and high output. Also here's a link for you http://www.angelfire.com/music5/audio0/

                  Comment


                  • #10
                    Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

                    Originally posted by blur View Post
                    It relates to the fusion in that they are both similar sizes and high output. Also here's a link for you http://www.angelfire.com/music5/audio0/
                    Thanks, I was unfamiliar with that speaker. It's bigger than the Alchemy and likely extends deeper in the bass too. The Alchemy will be several dB more sensitive though. It's all in Hoffman's trade-offs. The crossover in the Dayton 8 concerns me though, it indicates that there isn't much, if any, baffle step compensation. I would expect the two speakers have a different tonal balance.
                    Click here for Jeff Bagby's Loudspeaker Design Software

                    Comment

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