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  • #1

    WWMTMWW..thoughts, advice?

    All,

    I'm kicking around an idea for a new build. I'd like to build a WWMTMWW with 831735's, 832873's, and tweeter choices being Usher 9930, Seas 27TDFC, and CSS LD25x (trying to go with home stock drivers). I'm curious as to how doable everyone thinks this is.. especially in terms of the mid crossing to the tweeter and tweeter sensitivity. I'm thinking the 9930's are probably the worst choice here.. but wanted to get others' input. Due to WAF, these will not be going into the living room, but rather the man cave (bonus room) and pull 90% music duty. Hoping to go vented and let those HDS's dig. It will not be active.. for the sake of simplicity of set-up (or re-set-up in the event I eventually win the argument and they go into the living room). As usual (cuz I just get lost), Zach C. will be the brains of the X-over. I'm looking for serious SPL while maintaining clarity.. What say you all???
    Chris
    Tags: None
  • #2
    Re: WWMTMWW..thoughts, advice?

    the other drivers i have not heard, but the seas is a really nice tweeter. sounds like a great project. i'm still working on pete's schumakubin mk2 WWTMWW. they are big. i will be following this for sure.

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    • #3
      Re: WWMTMWW..thoughts, advice?

      Ask your crossover designer.
      I'm not deaf, I'm just not listening!

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      • #4
        Re: WWMTMWW..thoughts, advice?

        Don't overlook the SB26 and SB29.
        “I cried because I had no shoes until I met a man who had no feet”

        If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

        Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

        Comment

        • #5
          Re: WWMTMWW..thoughts, advice?

          I have used all three tweeters, and all of them are excellent. The Usher 9930 can cross over a little lower than the other two, so your crossover point will make a difference if it is lower than 2 kHz.
          Click here for Jeff Bagby's Loudspeaker Design Software

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          • #6
            Re: WWMTMWW..thoughts, advice?

            Originally posted by dcibel View Post
            Ask your crossover designer.
            Thanks for your positive and helpful response, much appreciated. He actually recommended I make this post to get others' ideas.

            To the others thus far, thank you (without sarcasm) for your responses.

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            • #7
              Re: WWMTMWW..thoughts, advice?

              Originally posted by thekorvers View Post
              Don't overlook the SB26 and SB29.
              Aww.. just did a google search.. I see that Madisound has these. SB29 93db and looks as though it could cross fairly low??

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              • #8
                Re: WWMTMWW..thoughts, advice?

                Originally posted by cwad8505 View Post
                Aww.. just did a google search.. I see that Madisound has these. SB29 93db and looks as though it could cross fairly low??
                If high SPL is your goal, I'd cross a little above 2K. Maybe as high as 2.5k.

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                • #9
                  Re: WWMTMWW..thoughts, advice?

                  Couldn't find your woofer or mids by the numbers you posted? Tweeter choice and Xo point will be dependant on midranges.

                  High SPL?......two RS52 domes with an offset SB29RDC (the small one).

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                  • #10
                    Re: WWMTMWW..thoughts, advice?

                    High SPL is the goal. Thanks for the rec on the SB29RDC, they have been ordered. Mayhem.. these were the Peerless buyouts from 2(?) years ago. I'm working on obtaining and posting measurements for these 2.
                    Chris

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                    • #11
                      Re: WWMTMWW..thoughts, advice?

                      For music, I'd assume no sub? You'll have to decide if you need to go big and low (like, almost 4 cf to reach below 35Hz), or smaller with (slightly) more output. The big box Xmaxes out at 120w. At more like 2.2 cf, they can take 180w, but F3 rises into the mid 40s. That's only about twice as loud down to around 60Hz, about the same at 50, with the bigger box nearly twice as loud down in the 30s. They both exceed Xmax at those levels before 30Hz.

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                      • #12
                        Re: WWMTMWW..thoughts, advice?

                        Originally posted by Chris Roemer View Post
                        For music, I'd assume no sub? You'll have to decide if you need to go big and low (like, almost 4 cf to reach below 35Hz), or smaller with (slightly) more output. The big box Xmaxes out at 120w. At more like 2.2 cf, they can take 180w, but F3 rises into the mid 40s. That's only about twice as loud down to around 60Hz, about the same at 50, with the bigger box nearly twice as loud down in the 30s. They both exceed Xmax at those levels before 30Hz.
                        I don't know if my parameters are different from yours, but in 4.0 cu ft, 4 Peerless 831735's hit xmax of 6mm @ 50 W in. SPL is + 114 dB at that point. f3 is indeed + 35 Hz.
                        “I cried because I had no shoes until I met a man who had no feet”

                        If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

                        Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

                        Comment

                        • #13
                          Re: WWMTMWW..thoughts, advice?

                          WinISD alpha is lookin' at <4mm excursion @ 50w with 4 drivers in 4cf tuned to 35Hz. 109dB/50w, 113dB/120w.
                          120w just bumps 6mm right at 50Hz, and then at 30 and below.
                          Qts 0.43, Vas 0.90, Fs 38, SPL 86, Sd 22 sq.in.

                          Comment

                          • #14
                            Re: WWMTMWW..thoughts, advice?

                            Originally posted by Chris Roemer View Post
                            WinISD alpha is lookin' at <4mm excursion @ 50w with 4 drivers in 4cf tuned to 35Hz. 109dB/50w, 113dB/120w.
                            120w just bumps 6mm right at 50Hz, and then at 30 and below.
                            Qts 0.43, Vas 0.90, Fs 38, SPL 86, Sd 22 sq.in.
                            This is really weird.

                            I have 6.3 mm excursion @ 50 W, 4 drivers in 4.0 ft3, fb 35 Hz, 113 dB/50 W.

                            Qts 0.43, Vas 0.9 ft3, Fs 38 Hz, SPL 86.5 dB, Sd 137 cm2 (= 21.2 inch2)

                            My version of WinISD is 0.50a7

                            One of us must be missing something or one of the calculations is corrupted. I must clear my head and come back to this after a while to see if I have missed something.
                            “I cried because I had no shoes until I met a man who had no feet”

                            If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

                            Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

                            Comment

                            • #15
                              Re: WWMTMWW..thoughts, advice?

                              I have figured out what the problem is:

                              WinISD has a calculation error when the Sd is changed in the parameter section of the alignment window!

                              I have probably done a few thousand alignments in WinISD in the past and have saved hundreds of them. Some time ago I discovered some wrong Sd parameters in a few of my driver files.

                              I changed the Sd parameter to the proper quantity in the driver file in the Editor. I then changed it in the parameter section of the alignment window of the related alignments, expecting the (mis) alignments to be corrected.

                              Even though the alignments substantially changed in respect to cone excursion, SPL etc, the values apparently are way off. WinISD is miscalculating these. The only way to get a correct alignment is to discard the original and do a new one with the corrected driver file.

                              I had wondered recently why in some of my alignments the SPL was way off from the specified sensitivity when plugging in 1 W for the signal. They should be the same. Now I know why.

                              I just proved this by creating 2 driver files for the same driver, but with different Sd's, doing the same alignment for both and then correcting the alignment for the incorrect one. The 2 alignments are completely different!

                              I guess I will now have to go over all my saved alignments with a fine tooth comb.

                              For those of you using WinISD this is good to know. Test it yourself. For everyone else sorry to have sidetracked this thread.
                              “I cried because I had no shoes until I met a man who had no feet”

                              If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

                              Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

                              Comment

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