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Digger8 Sub - diggity dig it all the way to 20Hz

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  • #76
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    I designed the Digger8 with 3 goals to achieve simultaneously: dig deep, compact as possible including minimizing floor space area, and low cost. There are plenty of ways to get 2 of the 3 while conceding on one of those so if that's ok for you, the design can certainly be modified to accommodate that. But getting all 3 of those was what t couldn't find in an existing design be it diy or commercial. If cost is not an issue, I would forego the PR and go with a larger driver in a more compact enclosure with a nice amp that has EQ, but that design would cost considerably more, but retains the size and extension attributes. I looked into various PRs including CSS, TC and Seas and had good experience with AE many years ago, but I knew of their typical lead times. The others were just to high in cost for me and the projects goals. But feel free to adjust to suit your needs and budget. I can help if needed.
    Kevin, I think the damage to the PR cone came from the weights hitting the brace while the cone still had a lot of momentum. I don't think having the weights is what caused it. If there were sufficient space behind the weights, I don't think the cone would have been damaged (though there's the potential for the surround to tear). You can sand/cut the brace a bit to provide more travel. I had to do that with mine also, but that was due to a poorly made enclosure that didn't fit together right.
    Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
    Digger8 - Small compact 8" sub with F3 = 20Hz
    Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
    Jeffrey - Tang Band W5-704D + Beston RT003C
    Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

    Comment


    • #77
      Re: Digger8 Sub - diggity dig it all the way to 20Hz

      Originally posted by jsr View Post
      Kevin, I think the damage to the PR cone came from the weights hitting the brace while the cone still had a lot of momentum. I don't think having the weights is what caused it. If there were sufficient space behind the weights, I don't think the cone would have been damaged (though there's the potential for the surround to tear). You can sand/cut the brace a bit to provide more travel. I had to do that with mine also, but that was due to a poorly made enclosure that didn't fit together right.
      Ya that is exactly right. The washers hang on the back and they hit the brace. I think IMHO that the AE PR will work better since it wont have anything hanging on the back of it. If the brace wasn't directly behind it, then it wouldn't be an issue.

      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


      • #78
        Re: Digger8 Sub - diggity dig it all the way to 20Hz

        The CSS PR won't have weights hanging off the back either. Not as esthetic as the AE, but will functionally be the same. Jeff Bagby's "tutorial" thread on modeling PRs in WBCD used the CSS PR.
        I was so much older then, I'm younger than that now.
        OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
        Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
        Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
        Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
        LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

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        • #79
          Re: Digger8 Sub - diggity dig it all the way to 20Hz

          Originally posted by fastbike1 View Post
          The CSS PR won't have weights hanging off the back either. Not as esthetic as the AE, but will functionally be the same. Jeff Bagby's "tutorial" thread on modeling PRs in WBCD used the CSS PR.
          jsr, if you could model the CSS PR or let me know how I could do it that would be awesome! Thank you!

          I found these specs in case they help:

          http://www.creativesound.ca/pdf/APRG.pdf

          I figure model the CSS as a possible replacement while we wait for the AE PR's and if they delay as much has been suggested, at least then we have another option even if it does break the budget :(

          Comment


          • #80
            Re: Digger8 Sub - diggity dig it all the way to 20Hz

            I am working on one of mine that takitaj sent me as a flat pack. I honestly don't see how the weights in these are going to hit the brace. I guess I will find out when they are finished.

            Comment


            • #81
              Re: Digger8 Sub - diggity dig it all the way to 20Hz

              Originally posted by johngalt47 View Post
              I am working on one of mine that takitaj sent me as a flat pack. I honestly don't see how the weights in these are going to hit the brace. I guess I will find out when they are finished.
              As far as I can remember from this thread/Kevin's thread, the Dayton requires a lot of additional weights to be added to the back whereas the AE PR12-970 already has the right weighting.

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              • #82
                Re: Digger8 Sub - diggity dig it all the way to 20Hz

                Originally posted by Benji View Post
                As far as I can remember from this thread/Kevin's thread, the Dayton requires a lot of additional weights to be added to the back whereas the AE PR12-970 already has the right weighting.
                I added about 565 grams of washers on mine.

                Comment


                • #83
                  Re: Digger8 Sub - diggity dig it all the way to 20Hz

                  Originally posted by Benji View Post
                  jsr, if you could model the CSS PR or let me know how I could do it that would be awesome! Thank you!

                  I found these specs in case they help:

                  http://www.creativesound.ca/pdf/APRG.pdf

                  I figure model the CSS as a possible replacement while we wait for the AE PR's and if they delay as much has been suggested, at least then we have another option even if it does break the budget :(
                  With the CSS 12", 650g of added mass will get a F3 of 20.7Hz with a HPF at 18Hz. The PR will not exceed its Xmax, but the active driver will at 200W below 20Hz.

                  I used 575g of added mass with the Dayton 12" PR. The Dayton's cone has a mass of 200g, so a total of 775g moving mass. According to the CSS data sheet, the CSS has a lighter cone at 94g, for a total moving mass of 744g, so about the same as the Dayton. But the CSS has much more excursion, to the point that it will allow the active driver to exceed Xmax. But the JBL and Infinity both have a pretty healthy Xmechanical.
                  Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
                  Digger8 - Small compact 8" sub with F3 = 20Hz
                  Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
                  Jeffrey - Tang Band W5-704D + Beston RT003C
                  Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

                  Comment


                  • #84
                    Re: Digger8 Sub - diggity dig it all the way to 20Hz

                    AWESOME jsr! Thank you for doing that for us, gives us another option at least! Can't wait to experience the Digger8!

                    Comment


                    • #85
                      Re: Digger8 Sub - diggity dig it all the way to 20Hz

                      NP. Hope you guys can finish your builds soon and enjoy the Digger.
                      Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
                      Digger8 - Small compact 8" sub with F3 = 20Hz
                      Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
                      Jeffrey - Tang Band W5-704D + Beston RT003C
                      Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

                      Comment


                      • #86
                        Re: Digger8 Sub - diggity dig it all the way to 20Hz

                        Built Digger8 and Overnight Sensations for 2.1 PC system. Infinity 860W with Yung 200w (no boost) amp. Ordered AE PR in December; hoping to see it in another couple of months. In the meantime, I fashioned an external port: 3" x 42" This gives Fb = F3 ~24Hz. Hole for port will disappear when the PR opening is cut. Had to put an elbow in it to tuck it in the corner under the wet bar where the computer is sitting. Pretty amazing bass for an 8" sub. I have a few photos of the build I'll try to "dig" up!

                        Click image for larger version

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                        • #87
                          Re: Digger8 Sub - diggity dig it all the way to 20Hz

                          I almost say... keep the the long PVC port.

                          Got an email from AE saying my PR is on the build table! Originally ordered on October 24th.

                          Comment


                          • #88
                            Re: Digger8 Sub - diggity dig it all the way to 20Hz

                            Originally posted by engr_dave View Post
                            Built Digger8 and Overnight Sensations for 2.1 PC system. Infinity 860W with Yung 200w (no boost) amp. Ordered AE PR in December; hoping to see it in another couple of months. In the meantime, I fashioned an external port: 3" x 42" This gives Fb = F3 ~24Hz. Hole for port will disappear when the PR opening is cut. Had to put an elbow in it to tuck it in the corner under the wet bar where the computer is sitting. Pretty amazing bass for an 8" sub. I have a few photos of the build I'll try to "dig" up!

                            [ATTACH=CONFIG]44330[/ATTACH]
                            Up periscope! :p Awesome. Nice wine shelf - did you build it by any chance?

                            I've got two Infinity 8's waiting for boxes. Plan was to use them for two 2.1 systems, but now I'm thinking they might end up as stands for my mains in my HT. Amazing how low these little subs model in such small boxes. Can't wait to hear one (or two )

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                            • #89
                              Re: Digger8 Sub - diggity dig it all the way to 20Hz

                              Haha, I have sub that's like that with a port sticking out. The port is actually extendable so i can adjust tuning.
                              Glad to see your guys' builds are coming to fruition.
                              I've been looking into another design that's smaller, roughly about 0.6-0.7cf with an 8in reaching almost as deep as the Digger8, but requires a Bash amp for the EQ boost. Any interest?
                              Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
                              Digger8 - Small compact 8" sub with F3 = 20Hz
                              Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
                              Jeffrey - Tang Band W5-704D + Beston RT003C
                              Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

                              Comment


                              • #90
                                Re: Digger8 Sub - diggity dig it all the way to 20Hz

                                Originally posted by JCSquats View Post
                                I almost say... keep the the long PVC port.

                                Got an email from AE saying my PR is on the build table! Originally ordered on October 24th.
                                Me too! Yay!

                                Originally posted by AE Email
                                Hello Benji,

                                Your PR12-970 is now on the build table being assembled. I will contact you after it has been tested, packaged and is ready to ship. Have a nice day.

                                Comment

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