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Speedster CENTER channel build

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  • Speedster CENTER channel build

    First I want to thank Paul Carmody for releasing these builds and making them available to everyone.

    I built the Speedster TMM's earlier this year and I really love them. I spoke with Paul at IowaDIY and asked if a center channel was ever made or if he intended on making one. He said he would send me a design for it! He thought it was a 4 woofer (MMTMM) but that was the sunflower center and the speedster center was actually still a 2.5 way but in an MTM configuration. I'm kinda glad it was only 2 woofers because the woofers are a little more expensive and I was able to get the OVNS dipoles to round out the setup.

    The crossover is the exact same as the speedster TMM's (LOCATED HERE). Paul said you can increase the box size, go sealed etc if needed but this was his recommendation.



    I just got this information so I haven't gotten very far yet only an hour or so between the finalist Folded MLTL tower im doing. The build thread will be going up in the next few weeks once it's nearing completion. I actually didn't have much wood on hand so I worked with what scraps I had left I was able to get the sides, slots, back and baffle cut. It is a crazy easy box to build. Just rip a 5 inch board and make all the cuts to length then do the top and bottom at 12x17. just cut the top /bottom last incase your off by a hair. I stopped and got some Aqua coat waterbased clear grain filler (has great reviews and you don't need to match colors since it's clear) and BB ply cabinet grade at Woodcraft it was a 24x30 piece for $22 definitely a lot more than mdf! I was going to veneer the top and bottom in walnut then wrap a more fancy veneer around the middle portions. I'm not certain it's necessary to veneer the Baltic birch ply it looks pretty good but it does look like a extremely thin layer on top. I'm going to Kentucky DIY this weekend so it's likely nothing will be posted for a week or two however there was some interest in this center so I wanted to post something. It's getting cold here fast so I will need to be working inside.

    Cut list (3/4" stock)
    Dimension Quantity
    5"x12" (2) - Sides
    5"x8.75" (2) - Slot Port
    5"x14.5" (1) - Baffle
    5"x15.5" (1) - Back
    12"x17" (2) - Top / Bottom






    The woofers needed some extra material removed



    I used some veneer tamer and "pre-bent" all the veneer with clamps and wood scraps to make the veneering process.







    I cut this brace so I didn't snap the 2 sections or the baffle in half scraping the veneer on.



    I used some weight, clamps, boards even though its contact cement.












    Checking the seams!


    Used this on the finalist mid tunnels it's Teak. I have about 24inch x 64inch left it looks great!



    Taped the area where the router bit flush trim bearing will run to minimize and marks from it.



    For this finish I used a water based grain filler rubbed in with a cloth. It's a gel that dries clear so you don't have to match the color of the wood and only need one. It doesn't fill knots in only the grain it's not really strong enough for holes or chips. Then I sanded to 320-400 and apply varnish














    And the finished product



    Last edited by Mike220; 12-22-2014, 07:18 PM.
    My Build Thread's
    Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

  • #2
    Re: Speedster CENTER channel build

    like it. pretty neat and compact! Paul has got a really nice design. too bad i already have the OS center.

    Comment


    • #3
      Re: Speedster CENTER channel build

      Originally posted by ani_101 View Post
      like it. pretty neat and compact! Paul has got a really nice design. too bad i already have the OS center.
      Yeh that is another killer speaker I usually suggest that to anyone looking or a pair. With the woofers on sale right now I think it comes out to $166 at PE using the audyn caps (which I like) but they out out of stock on 2 of the coils for the woofers. Still, 166 bucks for a matching center is a steal especially with a ribbon tweeter. I will try to measure them when im done as well. If my cats would keep their grubby paws off my mic cables or jumping onto my mic stand. They really are anti-measuring!
      My Build Thread's
      Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

      Comment


      • #4
        Re: Speedster CENTER channel build

        This looks great! It is my goal to convert my 5 speedster build to a 2 TM / 2 TMM / 2 MTM design at some point.

        Comment


        • #5
          Re: Speedster CENTER channel build

          Just curious, are you going to omit the L4 (2.0 mH) coil in the crossover diagram? I wouldn't thing you would want a 2.5 arrangement in a MTM center. Would omitting this change any of the other values? I don't think it would, but posing the questions for those more experienced than myself.

          Comment


          • #6
            Re: Speedster CENTER channel build

            Oooooooo this is tempting...... keep it rolling, would love to hear impressions....
            Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

            Comment


            • #7
              Re: Speedster CENTER channel build

              Originally posted by joeybutts View Post
              Oooooooo this is tempting...... keep it rolling, would love to hear impressions....
              +1 I was just thinking about building a new center channel. This will work nicely.

              Comment


              • #8
                Re: Speedster CENTER channel build

                Originally posted by jtheisen521 View Post
                Just curious, are you going to omit the L4 (2.0 mH) coil in the crossover diagram? I wouldn't thing you would want a 2.5 arrangement in a MTM center. Would omitting this change any of the other values? I don't think it would, but posing the questions for those more experienced than myself.
                I dont see it being a problem being a 2.5 way. 2-way Mtm's never seemed to be the optimum center channels. I'll let Paul handle the technical reason why. I did come across Rjb's site that gives a good explanation about comb filterig.

                Originally posted by joeybutts View Post
                Oooooooo this is tempting...... keep it rolling, would love to hear impressions....
                Yeh this one should go quickly Its an easy build. The finishing i want to try something a little different so hopefully it ends up looking awesome. Its a really cheap build at $166 the woofers are $41 on sale right now. The ribbon i find to have excellent horizontal dispersion and vertical isnt as bad as people make ribbons out to be vs domes.
                My Build Thread's
                Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

                Comment


                • #9
                  Re: Speedster CENTER channel build

                  Mike, did Paul mention any specs on the sealed alignment? 12" is too deep for my mantle...I can make it work, just weighing options and at what costs....
                  Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

                  Comment


                  • #10
                    Re: Speedster CENTER channel build

                    [QUOTE=Mike220;2025182]I dont see it being a problem being a 2.5 way. 2-way Mtm's never seemed to be the optimum center channels. I'll let Paul handle the technical reason why. I did come across Rjb's site that gives a good explanation about comb filterig.

                    Assuming it will be run horizonally, wouldn't the 2.5 way setup cause anomilies in off axis response?

                    Comment


                    • #11
                      Re: Speedster CENTER channel build

                      Perhaps. I would only use the center for movies maybe some television where i would be sitting on axis plus or minus 5-6 feet to either side. As long as im in the sweet spot i dont care too much about it! Unless my movie patrons want to start chipping in time and funds that is!
                      My Build Thread's
                      Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

                      Comment


                      • #12
                        Re: Speedster CENTER channel build

                        To put it another way, if three people are sitting on a couch. It sounds great to the person on the left and in the center. But the guy sitting off axis on the .5 side is missing out on some of the upper midrange. Seems you would want it uniform in a horizontal placement.

                        Comment


                        • #13
                          Re: Speedster CENTER channel build

                          Originally posted by jtheisen521 View Post
                          To put it another way, if three people are sitting on a couch. It sounds great to the person on the left and in the center. But the guy sitting off axis on the .5 side is missing out on some of the upper midrange. Seems you would want it uniform in a horizontal placement.
                          I feel like Mike is trying to nicely say start a new thread to discuss this.
                          Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

                          Comment


                          • #14
                            Re: Speedster CENTER channel build

                            Originally posted by joeybutts View Post
                            I feel like Mike is trying to nicely say start a new thread to discuss this.
                            OK, sorry, I didn't mean to thread jack. I'm still learning and was interested in your opinions as I'm considering this build myself.

                            Comment


                            • #15
                              Re: Speedster CENTER channel build

                              Ill see if i can get some off-axis measurements when its completed. I dont think Paul would have released this if it would be that narrow of a sweet spot. He has experience designing multiple center channels.
                              My Build Thread's
                              Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

                              Comment

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