Sign in   |  Join   |  Help

Search

  • Re: A Beovox MS150 Project

    The cabinets seem solid and everything seems intact. This pair of MS150's just suffered through a long period of storage where they weren't in use. But I also think they weren't in use because maybe there was a rattle in the cabinet. Maybe loose inductors on the crossover PCB (judging by the fact several have been re-glued). I don't think the 8 inch driver can be saved. The center pole is solid enough where I can't move it by hand but it is loose. It really needs someone with
    Posted to The Workbench (Forum) by sonavor on Mon, Apr 16 2012
  • Re: A Beovox MS150 Project

    I have the crossover for the cabinet removed and ready to recap. There are a couple of inductors that are not as secure as the should be so I will reapply some tacky glue where the original glue came off. As I showed in earlier pictures of this project, it looks like someone has worked on the speakers before. There were some spots I could tell were new glue instead of the original. The back of one of the inductors has a chip in it. That inductor is firmly in place though and appears to have original
    Posted to The Workbench (Forum) by sonavor on Mon, Apr 16 2012
  • Re: A Beovox MS150 Project

    The 8 inch and 10 inch driver refoams are finished and came out as good as the first 10 inch driver. I glued the dust caps back on already. I was trying to decide if I wanted to quickly put the drivers back into the cabinets now and see what they sounded like (which meant I would also have to open one of my S120.2 cabinets to borrow the 8 inch driver)....but decided against it. The speaker trim pieces still needed cleaning, the crossovers still have to be recapped and I want to clean up the cabinets
    Posted to The Workbench (Forum) by sonavor on Mon, Apr 16 2012
  • Re: A Beovox MS150 Project

    Managed to get the second 10 inch driver shimmed and the surround glued to the frame. So both the 8 and 10 inch drivers will be ready to test tomorrow. I shimmed this second 10 inch driver a little tighter than the first. I was able to re-use the long 005 gauge shim from the first one but I used 004 gauge shims for the second layer (instead of 003 gauge).
    Posted to The Workbench (Forum) by sonavor on Sun, Apr 15 2012
  • Re: A Beovox MS150 Project

    Tonight I shimmed and glued down the surround on the good 8 inch driver. The width of the channel where the voice coil travels measured about 1.5 mm. The diameter of the center pole is 7.5 cm. I cut two 23 cm long x 6 cm wide strips of my remaining 005 gauge acetate. I fit both strips into the channel. Then I put smaller 005 gauge acetate strips between the two long strips to make the fit tighter. I could still move the cone but it was pretty snug. I felt that was a good shim. As I already knew,
    Posted to The Workbench (Forum) by sonavor on Sun, Apr 15 2012
  • Re: A Beovox MS150 Project

    Good suggestions Søren. I examined the driver again and took these photos. The center pole is definately going to determine if this can be fixed. I used a tripod to fix the camera directly over two opposite sides of the voice coil channel and I can now see that the center pole is not exactly centered. It is centered enough to allow the voice coil to be removed but as the pictures show, the gap is not the same all the way around. Ideally the center pole part would be pulled and re-aligned into
    Posted to The Workbench (Forum) by sonavor on Fri, Apr 13 2012
  • Re: A Beovox MS150 Project

    Here is a picture of the voice coil assembly separation from the other side (the inside of the tube). It looks repairable to me. The gap/channel where the voice coil moves is a lot wider on this 8 inch driver than on the 10 inch driver I just finished the surround on. I think there would be enough room add material to repair the voice coil assembly and still slide in and out of the channel. The question is still about the integrity of the center pole and if it needs anything done to it.
    Posted to The Workbench (Forum) by sonavor on Fri, Apr 13 2012
  • Re: A Beovox MS150 Project

    Here is a picture of the straightened center pole and the voice coil removed. The upper ring area of the voice coil (above where the wire windings are) is pulled away. The question now is can this driver be repaired. I would think the voice coil could be repaired and re-attached to the spider and cone. I'm not sure about the center pole that I was able to rock back into place. Why was it loose? Since I can only move it with pliers would it function okay as a woofer if the other pieces were repaired
    Posted to The Workbench (Forum) by sonavor on Fri, Apr 13 2012
  • Re: A Beovox MS150 Project

    Update on the bad 8 inch driver.... Tonight I took apart the 8 inch driver with the frozen cone. First I cut away the spider from the frame and un-soldered to two leads from the cone to the frame connection points. The cone and voice coil assembly still wouldn't budge. So I pulled the spider and cone from the voice coil. I checked the gap between the center pole (doughnut in this driver's case) and the voice coil with my acetate sheets. They wouldn't go all the way around as I was sure
    Posted to The Workbench (Forum) by sonavor on Fri, Apr 13 2012
  • Re: A Beovox MS150 Project

    Thanks Søren. Today I removed the shims. What a great feeling to try out the movement and see that the travel feels perfect. I hooked the driver to a signal generator and pumped it with a 0.4v sine wave from 20 Hz to around 160 Hz. It sounded just as I expected it to. I must say using the shims worked as well as advertised and I feel more secure in the repair having seen the cone evenly spaced around the pole. I still have the other 10 inch driver and the remaining good 8 inch driver to finish
    Posted to The Workbench (Forum) by sonavor on Fri, Apr 13 2012
Page 3 of 299 (2983 items) < Previous 1 2 3 4 5 Next > ... Last ยป | More Search Options
Beoworld Security Certificate

SSL