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on Sale - $55/pr (drivers & XO)

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  • Re: on Sale - $55/pr (drivers & XO)

    A tweeter that has 6 ohms and can play what the crossover is set at.

    I got the DIY ITCH! I have found my next project! I have decided to build the Modula MT (Nat P speakers but the upgraded version in both parts and X-over for even better sound).

    I shall let the tweeter break in and see how they sound then. I hardly have 2 hours in them.

    Comment


    • Re: on Sale - $55/pr (drivers & XO)

      Nick,

      I am not thinking of using the same crossover again. I would just like a compatible tweeter of a little higher quality and maybe crossed over a little lower. I would also like to do a build with less emphasis on the budget and more emphasis on quality components in the cross over.

      Scott

      Comment


      • Re: on Sale - $55/pr (drivers & XO)

        Why not pick a build with higher quality drivers to start. As many have commented, it doesn't make much sense to spend $30 in copper for a $15 driver.

        Also, there is significant difference of opinion about how much audible difference there is/is not in XO components once you're at lest at the Dayton/Bennic - Jantzen level.

        Originally posted by MLS View Post
        Nick,

        I am not thinking of using the same crossover again. I would just like a compatible tweeter of a little higher quality and maybe crossed over a little lower. I would also like to do a build with less emphasis on the budget and more emphasis on quality components in the cross over.

        Scott
        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

        Comment


        • Re: on Sale - $55/pr (drivers & XO)

          Originally posted by nick650 View Post
          A tweeter that has 6 ohms and can play what the crossover is set at.
          I don't think that'll work.

          I shall let the tweeter break in and see how they sound then. I hardly have 2 hours in them.
          Let 'em play while you're out and about. I set mine out in the garage, cranked them up to a decent volume, and left them playing while I was at work.

          Comment


          • Re: on Sale - $55/pr (drivers & XO)

            Originally posted by MLS View Post
            Nick,

            I am not thinking of using the same crossover again. I would just like a compatible tweeter of a little higher quality and maybe crossed over a little lower. I would also like to do a build with less emphasis on the budget and more emphasis on quality components in the cross over.

            Scott

            See that is what I did. I upgraded the resistors to the Dayton audio grade and then the mills for the woofers. I also did a 18 AWG for the woofer coil series, a cross-cap for the tweeter as my improvement. I also plan to change out the electrolytic caps for some decent caps like the Dayton Audio caps so that my circuit is more true to what it should be. There isn't much you really can do to improve what is here. This was created with budget in mind (while sounding the best as possible and every time I play them my jaw drops) and changing out parts will require modification to the X-over. Try out the Modula/Nat P tower if budget isn't a factor since that will eat your budget and sound the next level then trying to create a whole new X-over with different parts.

            Comment


            • Re: on Sale - $55/pr (drivers & XO)

              Here's a closer view of a driver inserted into the relief I routed into the baffle. If the driver looks like it's been around the block, it has. I've handled it a lot in coming up with a pattern for the router. The fit isn't perfect, but it's very close -- driver press-fits into the relief tightly enough to hold it in for the photo.



              I think I mentioned before that I'm thinking of trimming the driver flange with plastic laminate. I cut the relief deep enough to accommodate the trim, the flange, and a gasket behind the driver. The gasket that comes with the driver is minimal, to say the least. But then, they didn't make these to be flush mounted.

              Here's a photo showing the trim piece I made which would cover the black flange, and the glue smudges left over from fitting the rubber surround at the factory.



              Try to visualize how the trim would look on a black baffle, if you can. There will be four allen head cap screws in the holes also. The final trim pieces should match the opening better too. I'm not certain I'll use these yet.

              In the next photo I'm wet sanding the enclosure after it has been sealed with fiberglass resin diluted with acetone, and body filler has been applied to defects. This has been the most difficult part of this build -- the resin has been very slow to cure and will clog sandpaper almost instantly. That's the reason for the wet sanding process -- that's the only way I've been able to sand them.



              I'm currently building the crossovers. Here's a drawing that shows the layout. The board is sized to allow insertion through the driver openings.



              This last drawing is a mirrored copy that shows how the components are wired together under the board, to complete the circuitry.

              Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
              Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
              Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
              Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
              Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
              NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

              Comment


              • Re: on Sale - $55/pr (drivers & XO)

                Very nice! I would upgrade the 2.0 Mh to a coil if possible. It is about $3.3 more but WELL worth it since ALL the parts Chris has chosen is on a budget. Not saying the parts he chose is bad, its just a good idea to upgrade the parts to get that extra little kick out of them (worth doing, worth over doing).

                Comment


                • Re: on Sale - $55/pr (drivers & XO)

                  what grit are you using on the epoxy? when it was gumming on me I used 80 on a orbital sander. Once the shine was off it sanded ok with 100/120

                  Comment


                  • Re: on Sale - $55/pr (drivers & XO)

                    Originally posted by Mikers View Post
                    what grit are you using on the epoxy? when it was gumming on me I used 80 on a orbital sander. Once the shine was off it sanded ok with 100/120
                    I haven't gone as low as 80 grit, but I've tried several different grits, ranging from 100 up through 220. It's giving me a lot more grief than a previous build where I also used fiberglass polyester resin. I think I somehow didn't get enough catalyst in the mix, although I was careful to measure everything. It's also possible that the acetone used to thin the resin changes the catalyst to resin ratio, i.e., more catalyst is required. It'll harden eventually...
                    Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
                    Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
                    Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
                    Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
                    Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
                    NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

                    Comment


                    • Re: on Sale - $55/pr (drivers & XO)

                      Originally posted by nick650 View Post
                      Very nice! I would upgrade the 2.0 Mh to a coil if possible. It is about $3.3 more but WELL worth it since ALL the parts Chris has chosen is on a budget. Not saying the parts he chose is bad, its just a good idea to upgrade the parts to get that extra little kick out of them (worth doing, worth over doing).
                      I've already started soldering -- is there a consensus amongst the builders here that the air coil produces a worthwhile benefit? I've noticed some discussion lately, but this string is so long, I hate to go back and read everything again.
                      Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
                      Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
                      Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
                      Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
                      Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
                      NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

                      Comment


                      • Re: on Sale - $55/pr (drivers & XO)

                        It's unlikely to matter with this driver set. Many would say that's its unlikely to matter at all.


                        Originally posted by Soundslike View Post
                        I've already started soldering -- is there a consensus amongst the builders here that the air coil produces a worthwhile benefit? I've noticed some discussion lately, but this string is so long, I hate to go back and read everything again.
                        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

                        Comment


                        • Re: on Sale - $55/pr (drivers & XO)

                          Originally posted by fastbike1 View Post
                          It's unlikely to matter with this driver set. Many would say that's its unlikely to matter at all.
                          101% correct !

                          The XO is modeled with the coil's DCR taken into account. Mess with that, and you're changing the voicing. Most newbies don't understand this. I know a 40-year audiophile who doesn't. He modded a crossover by using something like 8 gauge inductors. They look like a stack of 25 CDs.

                          Iron cores CAN saturate, but you'd be melting the coils out of the little woofer's long before that could happen.

                          chris

                          Comment


                          • Re: on Sale - $55/pr (drivers & XO)

                            He modded a crossover by using something like 8 gauge inductors. They look like a stack of 25 CDs.- Chris Roemer
                            Now that's funny!

                            Thanks Fastbike and Chris for clearing up the issue.
                            Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
                            Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
                            Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
                            Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
                            Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
                            NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

                            Comment


                            • Re: on Sale - $55/pr (drivers & XO)

                              Here's a photo or two of the finished crossovers:





                              And here's how they're wired on the underside:



                              The boards are made from 1/4" hardboard (Masonite), all components are secured solely with hot-melt glue (and the underside wire connections), 18 gauge "hook-up" stranded wire was use where necessary (black and red, where the component leads weren't long enough to make connections), and heat-shrink tubing (blue) was used to insulate bare wires in close proximity to other bare wires.
                              Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
                              Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
                              Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
                              Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
                              Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
                              NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

                              Comment


                              • Re: on Sale - $55/pr (drivers & XO)

                                Wow, those look nice.

                                Comment

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