Sunn 200S clone

Discussion in 'Bass Central' started by MisterT, Dec 14, 2012.

  1. MisterT


    Nov 13, 2007
    Hey All,
    I just recently built a Sunn 200S cab per Conrad Sundholm plans.
    I had 2 older Eminence square back 15's and installed them.
    Using my 67' Fender Bassman head the cab sounded good at 3-4.
    When I take it up to 5-6 the speakers began to make an awful blapping sound. Contacted Conrad and was told the old speakers will not work in this folded horn 2-15 he recommended the Eminence CB 15's. I bought 2 new ones and installed them.
    Same blapping sound at 5-6 volume. This just sucks!
    I went back over the cab plans detail by detail and discovered I had mounted the port boards with the the angled piece to the back of the bottom edges of the speaker baffles. The plans show them mounted just below the baffle edges.
    Could this error cause all this bad blapping! I even added more insulation thinking this might increase the internal pressure on the speakers. No improvement!
    I can't get it out of my mind that the internal volume is too much and the speakers are becoming unloaded and causing the blapping sound.
    Can anyone help or tell me who I might contact?
    Sorry to be so wordy!!
    Take care and stay low!
    PawleeP likes this.
  2. edbass


    Nov 8, 2004
    Do a search on the Sunn Discussion Page.

    There have been more than a couple multiple page threads about 200S and 2000S clone cab projects, including ones built using Conrad Sundholm's plans.
    I'm certain that the builders would be happy to share their experiences and any advice they may have.
    PawleeP likes this.
  3. PawleeP


    Oct 8, 2012
    Cool, I read that the legend cb158 works ok in the 200s type cabs, not sure if vent/shelf opening(s) need to be modified to be smaller or not.. the legend allegedly rolls off the upper mids/highs pretty sharply though.. would love to test mine < Dean Markley 200s clone>. out with some of these anyway, because it came with Force 15's (not sure if that was from factory or not, however; they are a matching set) or maybe a set of k140's will fall out of the sky...
    Last edited: May 31, 2015