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Subwoofer Project, Dual 15" Eminator

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  • Subwoofer Project, Dual 15" Eminator

    To continue the speakers I've been building for our TV room (Home Theater, see other threads I've started) I recently built a dual 15" subwoofer cabinet, it's very large and will sit in the corner of the room which is currently empty and behind an end table. Got the wife's approval after some convincing =)

    The enclosure

    I built the enclosure to be 9.5 cubic feet minus ports, subs and bracing it's closer to 9.0. I also made the baffle removable so I can easily repurpose the enclosure for virtually whatever I want, even the ports and terminals are attached to the baffle so once it comes off any of many different configurations of speakers and ports can be used. It is built out of 3/4" maple plywood and heavily braced with 1/2" pine plywood internally. I think at some point I'll put a long excursion 18" in this as 9 cubit feel works very well.

    Outside dims are 48" tall, 24" wide and 18" deep.

    Once the front baffle is bolted on it is essentially 1.5" thick. I didn't have to use any sealing mechanism between the baffle and the enclosure, everything was flat and tight and once bolted up is completely air tight. The vertical corners feature a 1" roundover, visually it is the same as the PS2 speakers and center channel I already built. Stain is black Varathane with Minwax rattle can semigloss polyeurethane. The feet are large 1.5" rubber from Amazon.

    The ports are really nice 3" flare ports from Parts Express on clearance for only $4 each. I need to DATS the enclosure to be sure my port tuning is where I want it to be, but I calculated it to be 25hz, but these flare ports are tricky to get right as the length is arbitrary once you include the flared section.







    Subwoofers

    I recently came across Eminence's website where they are clearing out their "Eminator" subwoofer line, I picked up 4 15" for $34 each..shipped! Can't beat that price, they have inventory of 10 and 12" too, for the money they are really nice subs, used to sell for $100 each, stamped steel frame but reasonably sized motor, voice coil and decent xmax too. They are also very efficient at 94db each.





    Overall Cost

    This subwoofer cost me well under $200 to build complete, $68 for the subwoofers and $75 for the plywood. Amplification I'll be running this subwoofer off an Adcom GFA-555 (about 350w/channel) and out of the LFE output on my Denon AVR-X4200W reciever which also has Audyssey XT32 in room equalization.

    As you can see in room response is flat to 20hz, it modeled well to 30. And that is with no EQ.

    I think it is easily hitting 110-115db in room but I don't have a mic that reads that high, it easily hits 100db with a few watts and gets MUCH louder than that still.



    Finished product











    And compared to my 4 year old son =)



    Hope you enjoy the project!

    Sent from my iPhone using Tapatalk
    --
    Javad Shadzi
    Bay Area, CA

    2-Channel Stereo system in the works with Adcom components and 4-way towers

  • #2
    I couldn't convince my wife to let me have that sub, so you must be a really good negotiator . Not to mention very nice build and FR. Enjoyed your previous projects and this one does not disappoint either, very nice! Sent from my iPhone using Tapatalk
    Paul

    The "SB's" build page
    http://techtalk.parts-express.com/sh...-4-(pic-heavy)

    Comment


    • #3
      Oh and a video of them doing 5hz https://vimeo.com/162220919 Sent from my iPhone using Tapatalk
      --
      Javad Shadzi
      Bay Area, CA

      2-Channel Stereo system in the works with Adcom components and 4-way towers

      Comment


      • #4
        Originally posted by bullittstang
        I couldn't convince my wife to let me have that sub, so you must be a really good negotiator . Not to mention very nice build and FR. Enjoyed your previous projects and this one does not disappoint either, very nice! Sent from my iPhone using Tapatalk
        Thanks I appreciate that! And I'm a good negotiator but I have an awesome wife so I can't take too much credit =)
        --
        Javad Shadzi
        Bay Area, CA

        2-Channel Stereo system in the works with Adcom components and 4-way towers

        Comment


        • #5
          Nice build and at that a budget build! Once you get acclimated with them you should report back on how they are performing.... I could forsee a 10" or 12" build with this line for the garage..

          Comment


          • #6
            Originally posted by careyink
            Nice build and at that a budget build! Once you get acclimated with them you should report back on how they are performing.... I could forsee a 10" or 12" build with this line for the garage..
            Thanks! I have it installed in the living room and it's hitting about 120db easily, bass is low and tight, really liking it! Here it is hidden in the corner =)
            --
            Javad Shadzi
            Bay Area, CA

            2-Channel Stereo system in the works with Adcom components and 4-way towers

            Comment


            • #7
              You just turned that chair into a "massage" chair for relieving all the days stress and worries... one action movie (or Pop song) at a time! Looks good and you totally used a dead-space area, which is very smart.
              Paul

              The "SB's" build page
              http://techtalk.parts-express.com/sh...-4-(pic-heavy)

              Comment


              • #8
                Originally posted by bullittstang
                You just turned that chair into a "massage" chair for relieving all the days stress and worries... one action movie (or Pop song) at a time! Looks good and you totally used a dead-space area, which is very smart.
                Thanks bullittstang! =)
                --
                Javad Shadzi
                Bay Area, CA

                2-Channel Stereo system in the works with Adcom components and 4-way towers

                Comment


                • #9
                  Originally posted by JavadS
                  Thanks! I have it installed in the living room and it's hitting about 120db easily, bass is low and tight, really liking it! Here it is hidden in the corner =)
                  How is that picture frame still on the wall, do you have it nailed in place? :D
                  "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

                  http://www.diy-ny.com/

                  Comment


                  • #10
                    Originally posted by Face
                    How is that picture frame still on the wall, do you have it nailed in place? :D
                    Haha yea basically =)
                    --
                    Javad Shadzi
                    Bay Area, CA

                    2-Channel Stereo system in the works with Adcom components and 4-way towers

                    Comment


                    • #11
                      I'm happy to see your in room response. I have a pair myself along with a Crown XLS1000 to power them. I'm going to build them in two boxes large enough to double as speaker stands. I've recently moved and got the projector and screen up. Just ordered light control and I'm looking forward to building the subs...

                      Comment


                      • #12
                        Originally posted by generic View Post
                        I'm happy to see your in room response. I have a pair myself along with a Crown XLS1000 to power them. I'm going to build them in two boxes large enough to double as speaker stands. I've recently moved and got the projector and screen up. Just ordered light control and I'm looking forward to building the subs...

                        I look forward to your build. Please post it in a thread.
                        Sausage With Meat Sause, Please

                        Comment


                        • #13
                          Originally posted by generic
                          I'm happy to see your in room response. I have a pair myself along with a Crown XLS1000 to power them. I'm going to build them in two boxes large enough to double as speaker stands. I've recently moved and got the projector and screen up. Just ordered light control and I'm looking forward to building the subs...
                          Very cool keep me posted, very happy with how these turned out for the money. Sent from my iPhone using Tapatalk
                          --
                          Javad Shadzi
                          Bay Area, CA

                          2-Channel Stereo system in the works with Adcom components and 4-way towers

                          Comment


                          • #14
                            Time to wake this up from the dead. Yes, I know how long it's been. I moved again, but it was also delayed because I wasn't sure if I wanted to build such monsters, but I just went for it.

                            Only a iPhone and app was used for the measurements. I do have a real gig, but I haven't used it in years.

                            The end result was complete success. The 2nd sub is close behind. I have no ideal how long they will take to look pretty, but for now. It's listening time.

                            Boxes are 5.7 cubic feet tuned to 27hz.
                            Attached Files

                            Comment


                            • #15
                              First rule in Government spending. Why build one when you can build two for twice the price.

                              The YPAO subtracted 5.5db with a 2nd sub. Oddly, it changed the crossover from 80hz ingle to 100hz dual.

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