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  • Modeling Help

    Can anyone assist me in modeling a SEAS prestige H1208? Madisound recommends a vented box of 1.0 cubic foot with a 2" diameter vent by 6" long for an F3 of 35Hz. According to Unibox, that will not work. Port noise is astronomical. I may not be entering something correctly though. Can anyone take a look at this and verify? Im looking for it to play up to 500-700hz or so. It definitly looks like a beast of a driver with a nice Xmax of 14mm.

    http://www.madisoundspeakerstore.com...m-cone-woofer/

  • #2
    Re: Modeling Help

    You are correct that a 2" diameter port in that alignment will have high peak velocity. It would probably cause port compression and change the FR of the alignment. It may or may not be audible as far as port noise/chuffing.

    A 3" vent diameter 13.5" long will help bring the velocity more in line when modelled at 125 watts. The other thing I would mention is that the 14mm xmax is peak to peak. It is 7mm one way.

    Originally posted by ameuba10 View Post
    Can anyone assist me in modeling a SEAS prestige H1208? Madisound recommends a vented box of 1.0 cubic foot with a 2" diameter vent by 6" long for an F3 of 35Hz. According to Unibox, that will not work. Port noise is astronomical. I may not be entering something correctly though. Can anyone take a look at this and verify? Im looking for it to play up to 500-700hz or so. It definitly looks like a beast of a driver with a nice Xmax of 14mm.

    http://www.madisoundspeakerstore.com...m-cone-woofer/
    Loren Jones

    http://techtalk.parts-express.com/sh...-sound-drivers

    http://techtalk.parts-express.com/sh...for-live-sound

    Comment


    • #3
      Re: Modeling Help

      Originally posted by lorenmjones View Post
      You are correct that a 2" diameter port in that alignment will have high peak velocity. It would probably cause port compression and change the FR of the alignment. It may or may not be audible as far as port noise/chuffing.

      A 3" vent diameter 13.5" long will help bring the velocity more in line when modelled at 125 watts. The other thing I would mention is that the 14mm xmax is peak to peak. It is 7mm one way.
      Ok so a 1cuft enclosure with a 3" vent, 13.5" long will tune the box to what, and have an f3 of what?

      Comment


      • #4
        Re: Modeling Help

        The 2 inch port worked fine for me. What's your design SPL?
        Attached Files
        John H

        Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

        Comment


        • #5
          Re: Modeling Help

          Fb of 35, F3 at 35. That smallish box with this driver and that tuning does give a bit of a hump in the response above tuning but it isn't much.

          I would mention that this driver looks pretty good in 60 liters with Fb around 24 (EBS type alignment). It has adequate xmax to take the 125w thermal power rating and it digs very deep with F3 around 23.

          Click image for larger version

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          Jholander, I think ameuba10 and I were both modelling at higher power. I was at 125w, the rated thermal limit of the driver. But your point is well taken. If you cut the power by 6db to something more realistic for home listening then you have no problems with vent velocity.

          Originally posted by ameuba10 View Post
          Ok so a 1cuft enclosure with a 3" vent, 13.5" long will tune the box to what, and have an f3 of what?
          Loren Jones

          http://techtalk.parts-express.com/sh...-sound-drivers

          http://techtalk.parts-express.com/sh...for-live-sound

          Comment


          • #6
            Re: Modeling Help

            Although I would love for these to dig down to 23hz, I just dont have the space for it. Im honestly pushing it now at 1cuft. Im currently looking at putting them in PE premade "1cuft MTM" cabs along with an aura whisper in an 8" waveguide that dave has been so graciously testing out for me. I still believe an f3 of 35 is pleasing. How well do these model in a .5cuft enclosure? I tried that and had difficulty with port length. Again, it may and probably is, due to inexperience on my part.

            Comment


            • #7
              Re: Modeling Help

              Lowering the FB can also decrease the port velocity if you're playing around in unibox
              John H

              Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

              Comment


              • #8
                Re: Modeling Help

                So how well do they model in .5cuft?

                Comment


                • #9
                  Re: Modeling Help

                  IMO seems a waste to go much smaller that 1 cube, might consider a smaller driver. .5 cubes is F3 of 46...
                  John H

                  Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

                  Comment


                  • #10
                    Re: Modeling Help

                    Both in the mid 30s. Xmax @ about 70w down in that range. 2"vent shows 135 fps (which I think is over Mach 0.10). 3x14 should work. 2-1/2" would also be a good option.

                    Comment


                    • #11
                      Re: Modeling Help

                      Originally posted by Chris Roemer View Post
                      Both in the mid 30s. Xmax @ about 70w down in that range. 2"vent shows 135 fps (which I think is over Mach 0.10). 3x14 should work. 2-1/2" would also be a good option.
                      I can achieve mid 30's in .5cuft? If so, that'll be the route I take for sure

                      Comment


                      • #12
                        Re: Modeling Help

                        No, THIS is the 1.0 cf thread.

                        Comment


                        • #13
                          Re: Modeling Help

                          Originally posted by Chris Roemer View Post
                          No, THIS is the 1.0 cf thread.
                          I dont know if that was sarcasm, but i was mislead when you said "both."

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                          • #14
                            Re: Modeling Help

                            Non intended. I meant both Fb and F3.

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