The Sunboxsub (SBS) - a quick peek at its construction progress

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  • Patrick Sun
    Super Senior Member
    • Aug 2000
    • 1380

    The Sunboxsub (SBS) - a quick peek at its construction progress

    Here's a few shots of the construction process/progress. I don't have much time to go into detail right now, but maybe a picture is worth a thousand words...

    Photo 1

    Photo 2

    Photo 3

    Photo 4

    Photo 5

    Photo 6

    Photo 7

    All that remains is the glue/clamp/caulk portion, and putting on the legs and bottom plate.




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  • Lex
    Moderator Emeritus
    • Apr 2001
    • 27461

    #2
    Heck of a nice job so far Patrick. What driver does it use? That is an ominous cabinet! Dimensions?

    Lex
    Doug
    "I'm out there Jerry, and I'm loving every minute of it!" - Kramer

    Comment

    • JonMarsh
      Mad Max Moderator
      • Aug 2000
      • 15261

      #3
      This is for your original SVS driver, which was upgraded recently?

      When do you expect to have it finished, Pat? It looks pretty nice to me!

      BTW, if you're ever looking for a good cheap measurement mic, check out the Behringer ECM8000; I just got in a pair of them for "portable/location" work; about $40 each, and they ought to cost 5 to 10 times that.




      Regards,

      Jon




      Earth First!
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      the AudioWorx
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      Resistance is not futile, it is Volts divided by Amperes...
      Just ask Mr. Ohm....

      Comment

      • Patrick Sun
        Super Senior Member
        • Aug 2000
        • 1380

        #4
        Actually, I've never owned a SVS sub, but every SVS owner upgrading their subs to the new SVS driver, they were selling the original drivers for $40 plus shipping, so I've snagged a few of those original SVS drivers.

        The outside dimension is 18"x18"x40.5". The sides are single layer of MDF with bracing from 2x2's in the panel joints, and single layers of MDF inside the enclosure in both vertical and horizontal directions. The top and bottom are double layered MDF. There's a closed off section for the amp so it is isolated from the thumping inside the enclosure.

        I've been debating on whether I need more horizontal braces (like every 6", or is 12" spacing enough)? Internal volume will hover around 4-4.5 ft^3 depending on how much more bracing I throw into the box. The flared port is a 4" Precision Port 19" long from end-to-end (I have leftover section from a previous project which is where I got the extra inch of tubing I needed (otherwise, the port kit gives you only 18" end-to-end for an effective port length of 17"), and is supposed to tune to around 20Hz.

        Also, SVS only uses a 2" clearance for their bottom endcap and the base plate. I'm thinking of going with 3.5" of clearance. My base plate will be double layered MDF with the same 3/4" roundover on the edges of my top and bottom sides for its exposed side.

        Functional completion date could be in a couple of days. I just need to route out some 1.25" wide holes for the dowel legs, and drill some wood screws through the bottom of the base plate to the leg, and from the bottom endcap to the legs to keep the legs from going anywhere. Then it's just a matter of glue-n-clamp the encosure nice and tight.

        That's an awfully attractive mic. One of these days in the future, I might have reason to delve into getting a measurement setup (need a house with more space than my current house).




        PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
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        Comment

        • JonMarsh
          Mad Max Moderator
          • Aug 2000
          • 15261

          #5
          Hi Pat,

          Word I hear is that the end cap spacing influences frequency response in the area from around 100 Hz up- you may want to experiment with that before finalizing the construction.

          -Jon




          Earth First!
          _______________________________
          We'll screw up the other planets later....
          the AudioWorx
          Natalie P
          M8ta
          Modula Neo DCC
          Modula MT XE
          Modula Xtreme
          Isiris
          Wavecor Ardent

          SMJ
          Minerva Monitor
          Calliope
          Ardent D

          In Development...
          Isiris Mk II updates- in final test stage!
          Obi-Wan
          Saint-Saƫns Symphonique/AKA SMJ-40
          Modula PWB
          Calliope CC Supreme
          Natalie P Ultra
          Natalie P Supreme
          Janus BP1 Sub


          Resistance is not futile, it is Volts divided by Amperes...
          Just ask Mr. Ohm....

          Comment

          • Patrick Sun
            Super Senior Member
            • Aug 2000
            • 1380

            #6
            I guess it'll be easier to start with a long dowel and cut it down to size later if needed.




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            Comment

            • Patrick Sun
              Super Senior Member
              • Aug 2000
              • 1380

              #7
              No pix (they are still in the digicam), but here's an update anyway:

              I have glued up all but the front panel. The inside edge bracing has been caulked/glued and installed inside the backside of the enclosure (for all possible edges. Once I glue up the front panel, I can finish off the rest of the bracing (it'll be a chore since I'll have to go through the port/driver hole openings to install the remaining braces with the final panel glued in place).

              Once this is done, I will glue the outer top and bottom outside panels, and install the port, and driver. Then install the plate amp, the legs, and base plate.

              I'm probably a couple nights away from being operational.

              I did not quite grasp the enormity of the this 40" tall box until I put the box in its normal vertical orientation temporarily as I moved stuff around to get the clamps in position. Yowie! This is going to be a heavy sub.




              PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
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              • Patrick Sun
                Super Senior Member
                • Aug 2000
                • 1380

                #8
                Here's a quick shot of the in-progress enclosure:

                Photo 8

                I just have to do 6 main things to finish up the enclosure:

                1. drill screw holes for the bottom panel for the legs.
                2. glue the outer bottom panel to the rest of the enclosure.
                3. drill screw holes into the legs/dowels
                4. screw in the driver
                5. screw the legs to the base plate and the bottom panel.
                6. screw in the plate amp and the port




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                Comment

                • Patrick Sun
                  Super Senior Member
                  • Aug 2000
                  • 1380

                  #9
                  Okay, I've finally finished the SBS (sans cosmetics).

                  Photo 9

                  Slapping in the driver, amp, and port didn't take too long. It was all the other small details that took me a week working nights while also playing in a couple of softball games and eating out once this week that slowd me up a bit.

                  But I've got it hooked up and it's pounding away on Rush's Moving Pictures. At first it sounded strange, but then I adjusted the phase and the bass finally sounded normal to me. I haven't calibrated it (no need since it's not really mine, nor is it staying in my house/room) but going by ear, I went with 2/3 of the plate amp's power, and use the receiver's subout trim to lower it by 3dB. I set the plate amp's low pass around 90-100Hz (due to my receiver's LF cutoff when the sub's on). It sounds balanced now to me at the moment, though it's not in the best location in my room.




                  PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
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                  Comment

                  • JonMarsh
                    Mad Max Moderator
                    • Aug 2000
                    • 15261

                    #10
                    Another tube sub without the tube! :B

                    Of course, it's a lot easier to mount the plate amp that way!

                    I bet your friend will enjoy the sub quite a bit.

                    I've thought of doing a similar size cabinet, but laid down, for my two BPD1203's, in a sealed Linkwitz alignment. The weight is scaring me a little, though. Do you know how much your box came in at?

                    -Jon




                    Earth First!
                    _______________________________
                    We'll screw up the other planets later....
                    the AudioWorx
                    Natalie P
                    M8ta
                    Modula Neo DCC
                    Modula MT XE
                    Modula Xtreme
                    Isiris
                    Wavecor Ardent

                    SMJ
                    Minerva Monitor
                    Calliope
                    Ardent D

                    In Development...
                    Isiris Mk II updates- in final test stage!
                    Obi-Wan
                    Saint-Saƫns Symphonique/AKA SMJ-40
                    Modula PWB
                    Calliope CC Supreme
                    Natalie P Ultra
                    Natalie P Supreme
                    Janus BP1 Sub


                    Resistance is not futile, it is Volts divided by Amperes...
                    Just ask Mr. Ohm....

                    Comment

                    • Patrick Sun
                      Super Senior Member
                      • Aug 2000
                      • 1380

                      #11
                      Without the driver or the plate amp or the base plate installed, I was able to carry that box from the garage to my living room, but I'd guess...70 pounds or more?

                      I've calibrated the sub as well as I can using my SPL meter and Avia DVD. I have the plate amp's output at only 1/3 (with the knob line pointing to the second "r' in the "crossover" for the next knob over). My receiver's subout level is -7dB or -6dB.

                      It's been retuned to 17Hz, and the plate amp has the bass boost removed, and a Fc of 16Hz.

                      The dts version of "The Haunting" kills this sub. One the really tough bass passages, it goes pop pop poppity pop. It handles the pod race from The Phantom Menace AC-3 LD well, and Toy Story 2's intro doesn't make it go pop, but there's one instance when the gang is in the ventilation ducts around the 1 hour mark that makes the sub go pop.

                      Maybe I'm expecting too much from the driver on a select sub-killer DVDs.

                      Next up for testing: dts Jurassic Park LD, and U-571 DVD and das boot DVD.




                      PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
                      PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs

                      Comment

                      • Lex
                        Moderator Emeritus
                        • Apr 2001
                        • 27461

                        #12
                        I don't know what could be popping, as solid as that thing looks! Great job on it, even with a pop. Hope you are able to figure it out. Have you tried a different amp?

                        Lex
                        Doug
                        "I'm out there Jerry, and I'm loving every minute of it!" - Kramer

                        Comment

                        • Patrick Sun
                          Super Senior Member
                          • Aug 2000
                          • 1380

                          #13
                          It's the driver that's popping when it gets a dose of super-low sub-20Hz frequencies at high levels. But if you haven't heard/felt the dts Haunting, it's kind of hard to explain. Otherwise, it's a decently robust sub driver.




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                          Comment

                          • JonMarsh
                            Mad Max Moderator
                            • Aug 2000
                            • 15261

                            #14
                            That disk must have some high level stuff below the tuning of the sub, and the driver may be hitting the mechanical stops, such as the backplate. It is wisest to use a ported sub with an HP filter set a little ways below the box tuning. What's odd is that you say it's OK with TPM Pod race, which supposedly has some below 10Hz stuff.

                            Without putting a scope on the plate amp, I wouldn't rule out clipping, though.

                            -Jon




                            Earth First!
                            _______________________________
                            We'll screw up the other planets later....
                            the AudioWorx
                            Natalie P
                            M8ta
                            Modula Neo DCC
                            Modula MT XE
                            Modula Xtreme
                            Isiris
                            Wavecor Ardent

                            SMJ
                            Minerva Monitor
                            Calliope
                            Ardent D

                            In Development...
                            Isiris Mk II updates- in final test stage!
                            Obi-Wan
                            Saint-Saƫns Symphonique/AKA SMJ-40
                            Modula PWB
                            Calliope CC Supreme
                            Natalie P Ultra
                            Natalie P Supreme
                            Janus BP1 Sub


                            Resistance is not futile, it is Volts divided by Amperes...
                            Just ask Mr. Ohm....

                            Comment

                            • Patrick Sun
                              Super Senior Member
                              • Aug 2000
                              • 1380

                              #15
                              The dts version of The Haunting is known as the sub-killer because it has such strong sub-20Hz material. Most 12" drivers don't survive it when the DVD is played at moderately high levels. Don't believe me, go buy the dts Haunting DVD and go have some fun. I can even tell you where all the bass chaos occurs. I have no idea what the sound mastering engineer was thinking when they released the dts track for this DVD. It may be the nature of the waveforms in that the Haunting has a lot of sharp transients in the low end that probably over-drives the Xmax of the driver.

                              TPM's bass compresses the air in the room quite nicely, I can feel it in my ears when I was playing the Pod race. Perhaps the amplitude of the sub-20Hz bass material from the Pod race isn't as high as it is on the dts Haunting. And yes, the driver made it through the Pod race at acceptable SPLs. I will try out the depth charges from U-571 and Das Boot soon.




                              PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
                              PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs

                              Comment

                              • Patrick Sun
                                Super Senior Member
                                • Aug 2000
                                • 1380

                                #16
                                I re-tuned the port for 18Hz, and tested out the Pod Race, and it survived. Then I tested out U-571's dts track when the depth charges get dropped on the sub, and that was nice and bassy. I have the rumble filter Fc set to around 21Hz on the plate amp just to give it a little more protection down low, with just a hint of bass boost in the 31-35Hz range. I think I'll stick with this setup for now.




                                PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
                                PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs

                                Comment

                                • Patrick Sun
                                  Super Senior Member
                                  • Aug 2000
                                  • 1380

                                  #17
                                  Finally moved the SBS over to my friend's house last night. Hoo boy! Being able to corner load this baby in a dedicated HT room was sweet. I guesstimate the room dimensions to be 12'x10'x36' (not sure). We were standing behind the 2nd row of seats (on a platform behind the 1st row of seats) and the bass was truly cool to feel in that room. My friend had never heard the dts LD of Jurassic Park with all the dinosaur stomping on chapter 26 since his sub was a small sub without enough oomph to fill in that last octave or two. Well, with the SBS, he was getting that dinosaur in full force in his room.

                                  When we sat in the second row seats, the platform was vibrating, providing a nice foot massage in the bassy scenes. I told him that he'd have to brace that platform better with the SBS in the house.

                                  His wife called to the HT room and was complaining about all the thumping upstairs in their living room. I need to have my friend sign a liability waiver stating that I'm not responsible for any structural damage to his house nor his marriage. Heh.




                                  PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
                                  PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs

                                  Comment

                                  • JonMarsh
                                    Mad Max Moderator
                                    • Aug 2000
                                    • 15261

                                    #18
                                    Yeah, liability issues for structural damage to a marriage is a major insurance problem for audio constructors, especially subwoofers! :B

                                    :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL: :LOL:

                                    Hope your premiums are paid up, Pat!

                                    -Jon




                                    Earth First!
                                    _______________________________
                                    We'll screw up the other planets later....
                                    the AudioWorx
                                    Natalie P
                                    M8ta
                                    Modula Neo DCC
                                    Modula MT XE
                                    Modula Xtreme
                                    Isiris
                                    Wavecor Ardent

                                    SMJ
                                    Minerva Monitor
                                    Calliope
                                    Ardent D

                                    In Development...
                                    Isiris Mk II updates- in final test stage!
                                    Obi-Wan
                                    Saint-Saƫns Symphonique/AKA SMJ-40
                                    Modula PWB
                                    Calliope CC Supreme
                                    Natalie P Ultra
                                    Natalie P Supreme
                                    Janus BP1 Sub


                                    Resistance is not futile, it is Volts divided by Amperes...
                                    Just ask Mr. Ohm....

                                    Comment

                                    • Patrick Sun
                                      Super Senior Member
                                      • Aug 2000
                                      • 1380

                                      #19
                                      I need my friend to pay for some chiropractic sessions ffor my back because the SBS was one heavy sub that had to be carry around his house down to the basement.




                                      PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
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