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HoldOuts: An All RS TMM 2.5-way

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  • HoldOuts: An All RS TMM 2.5-way

    Based on the shielded RS150's, I used to call these the Legacies, as in the last of their kind. But since the new RS150's are a drop in replacement, keeping the design alive, I'm calling them the holdouts.





    The crossover is a symmetrical, acoustic Butterworth 3rd order, crossed with the RS28F's at 1.4kHz.






    The cabinet is 3/4 MDF all around at 40 liters internally. I used the iron-on method with Better Bonds heatlock glue raw walnut veneer. The RS150's modeled the best in Unibox of all the reasonably priced 8-ohm 5 1/4 midwoofers I could find. With a port is 6" x 3", I'm able to get an F3 of about 30Hz.




    How do they sound? Well I voiced them actively over 3 months of Winter, logging many hours of listening and tweaking. I used a wide variety of material and musical genres, standard and hi-res digital formats, as well as vinyl and even cassette tape sources. Throughout the process, a new source or material would reveal problem or issue, that I would address in subsequent tweaking. Previously, I've also received feedback that my voicing tend toward "polite" or "laid-back", so I made a conscious attempt at a more balanced sound.

    I'm extremely pleased with the results. I'm already a fan of the RS28A and Usher 9950-20 tweeters, so I new I would like the fabric dome. I didn't know how much! I would say its sound is somewhere between the clean and lean sound of the RS28A and the super warm and smooth sound of the 9950, with the best characteristics of each.

    The RS150 is one hell of a 5 1/4" midwoofer, very clean without any fatigue-producing harshness or false detail. I'm getting great bass performance paired up in this tower configuration. A full symphony, with even a large chorus or organ thrown in, is reproduced with authority.

    UPDATE:

    An alternative XO for a flatter response can be seen here:

    http://techtalk.parts-express.com/sh...26#post1886326
    Attached Files
    Last edited by jclin4; 02-01-2013, 07:34 AM.

  • #2
    Re: HoldOuts: An All RS TMM 2.5-way

    very nice.
    " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

    Quote Originally Posted by hongrn. Oct 2014
    Do you realize that being an American is like winning the biggest jackpot ever??

    http://www.midwestaudioclub.com/spot...owell-simpson/
    http://s413.photobucket.com/albums/pp216/arlis/

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    • #3
      Re: HoldOuts: An All RS TMM 2.5-way

      I'm sorry those cabinets are terrible, you should probably just send them to me for disposal.

      Nice work, sir. Very nice. I wish I had the fortitude to attempt a veneered finish.
      Don't listen to me - I have not sold any $150,000 speakers.

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      • #4
        Re: HoldOuts: An All RS TMM 2.5-way

        Nice cabinets. They look bigger in the photos than they actually are. The veneer has a lot of character. I'm in the process of building some large cabinets that will have a beveled baffle like yours. Did you veneer the bevel first or the adjacent faces?

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        • #5
          Re: HoldOuts: An All RS TMM 2.5-way

          Great job! Well-executed build all-around.
          Isn't it about time we started answering rhetorical questions?

          Paul Carmody's DIY Audio Projects
          Twitter: @undefinition1

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          • #6
            Re: HoldOuts: An All RS TMM 2.5-way

            J, very nice build indeed. Veneer looks great, nice clean lines and Im realey digging the feet on those bad boys. Please explain a little more of your "Tweeking" process if you dont mind. Thanks, R.K.

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            • #7
              Re: HoldOuts: An All RS TMM 2.5-way

              They look very nice congrats on the build.

              Take it easy
              Jay
              "I like Brewski's threads, they always end up being hybrid beer/speaker threads based on the name of his newest creation." - Greywarden

              Breakfast Stout - HiVi RT2 II/Aurasound NS6
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              • #8
                Re: HoldOuts: An All RS TMM 2.5-way

                Beautiful work and super informative thread

                Cheers

                Will

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                • #9
                  Re: HoldOuts: An All RS TMM 2.5-way

                  Thanks guys for the compliments!

                  Originally posted by Leroy R View Post
                  Nice cabinets. They look bigger in the photos than they actually are. The veneer has a lot of character. I'm in the process of building some large cabinets that will have a beveled baffle like yours. Did you veneer the bevel first or the adjacent faces?

                  Comment


                  • #10
                    Re: HoldOuts: An All RS TMM 2.5-way

                    Oh, and I can't resist...some more pics :p



                    Attached Files

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                    • #11
                      Re: HoldOuts: An All RS TMM 2.5-way

                      Those look fantastic! I'm really coming around to the small towers (not for me but for other people).

                      if I can swing it I think I may save up to build these for my grandmother for Christmas.
                      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

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                      • #12
                        Re: HoldOuts: An All RS TMM 2.5-way

                        Those are very nice indeed. Well done, sir!


                        Mark
                        You go your way, I'll go mine. I don't care if we get there on time.

                        ~Pink Floyd

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                        • #13
                          Re: HoldOuts: An All RS TMM 2.5-way

                          Originally posted by Randall Kepley View Post
                          J, very nice build indeed. Veneer looks great, nice clean lines and Im realey digging the feet on those bad boys. Please explain a little more of your "Tweeking" process if you dont mind. Thanks, R.K.
                          Thanks!

                          Here is a bit more info on the outrigger feet:

                          http://techtalk.parts-express.com/sh...52&postcount=4

                          Regarding tweaking or voicing, at a high level...basically it is just brute force trial and error.

                          But practically speaking, for me it is fine tuning the high-pass portion of the crossover. The low-pass is harder to "tweak", unless you have a deep inventory of inductors on hand. I do not...due to cost constraints. For the high-pass, switching out capacitors and resistors is easier and requires less investment.

                          In this project, I initially had just a [paralleled small value inductor and resistor] in series with the tweeter for padding. No matter what values I substituted for the resistor, I would hear blare from forte brass musical passages. It wasn't until I put in an L-pad (still with a paralleled small coil on the series resistor) that everything fell into place....then it was just a matter of trying out different values and combos for the series and parallel resistors until it sound right. ;)

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                          • #14
                            Re: HoldOuts: An All RS TMM 2.5-way

                            Originally posted by jclin4 View Post
                            Thanks!

                            Here is a bit more info on the outrigger feet:

                            http://techtalk.parts-express.com/sh...52&postcount=4

                            Regarding tweaking or voicing, at a high level...basically it is just brute force trial and error.

                            But practically speaking, for me it is fine tuning the high-pass portion of the crossover. The low-pass is harder to "tweak", unless you have a deep inventory of inductors on hand. I do not...due to cost constraints. For the high-pass, switching out capacitors and resistors is easier and requires less investment.
                            One thing I have found is it behooves a designer to pay close attention to buyout crossovers. I have stocked a wide variety of coils through buying various cheap speakers and buyout crossovers.

                            Ken McCullough is selling a lot of coils at a great price in the classified right now.

                            Seriously, your cabinets need to be disposed of - send them to me
                            Don't listen to me - I have not sold any $150,000 speakers.

                            Comment


                            • #15
                              Re: HoldOuts: An All RS TMM 2.5-way

                              Beautiful build j !! But I have a question...

                              Originally posted by jclin4 View Post
                              In this project, I initially had just a [paralleled small value inductor and resistor] in series with the tweeter for padding. No matter what values I substituted for the resistor, I would hear blare from forte brass musical passages. It wasn't until I put in an L-pad (still with a paralleled small coil on the series resistor) that everything fell into place....then it was just a matter of trying out different values and combos for the series and parallel resistors until it sound right. ;)
                              You bypassed/paralleled the series 2.7 ohm resistor with the .05mH coil? Wouldn't the fact that the DCR of the coil being like basically a dead short negate the resistor being there in the first place? Then when you placed the parallel resistor across the tweet that became the actual padding component.
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