Mangerbox

mangerbox_3This is my implementation of a loudspeaker with the unique and famous Manger MSW driver. Unlike with conventional loudspeaker drivers with rigid membranes, the Manger MSW is a bending-wave driver. The movement of the voice coil at the center of the highly flexible membrane induces a wave that travels radially towards the edge of the membrane. This is similar to the surface waves that result from throwing a stone into a pond. The Manger MSW has a flat frequency response from 300 Hz and higher, so it’s highly suitable for a very high-quality FAST (full range and subwoofer technology) loudspeaker system. I designed this small floor-standing loudspeaker around a Manger MSW WO-5 and a Visaton TIW 200 XS woofer mounted on the side of the enclosure. Both the MSW and the woofer are driven by a dedicated power amplifier using DSP filters. The crossover-frequency between the MSW and the woofer is about 300 Hz. Detailed notes and measurements taken during the development of the Mangerbox are available in a separate PDF document.mangerbox_1 mangerbox_2 mangerbox_plan

10 thoughts on “Mangerbox

  1. Albert Frans wrote on 07. April 2014:

    When will the PDF documents be available? The speakers look very nice. I own the 103B Mangers now for about 20 years now and would like to switch to much smaller speakers like yours.

    Greetings,

    Albert

  2. matthias wrote on 07. April 2014:

    Hi Albert

    You just reminded me of this. I can’t give a reliable date for the PDF, but I might be able to come up with a first version in the next few weeks. Is there anything particular your’re interested in?

    • Albert Frans wrote on 07. April 2014:

      Hi Mathias,

      Just like your speakers, mine are also active, using the miniDSP for the crossover and filters which are the same developed by HIFIAkademie for the Manger Box 109.
      My power amplifiers are at the moment the wellknown DIY
      SymAsym.
      What I’m curious about is the amount and type of filters you’re using for such a small speaker. And of course the stuffing used inside of the Manger and TIV 200XS compartment.
      Why did’nt you fix the “Trennwand” at an angle like Manger did for their 109 model?

      Cheers,
      Albert

      • matthias wrote on 12. April 2014:

        Hi Albert, the angled separator would make sense to reduce the standing wave (resonance) developing along vertical axis of the woofer box. However, I decided not to do this, because it would’ve been even more difficult to mount the woofer from the inside (which was cumbersome enough). Next time I’d probably mount the woofer from the outside, and an angled separator would be easy. For the MSW part it is much more important to minimise the sound reflection from the back wall. An angled back might help, but would either result in a smaller volume of the MSW chamber (not good) or require a larger and unattractive enclosure (also not good), so I just used acoustic foam to kill the sound reflection from the back. Just take a look at the PDF documentation, which is now available.

  3. Albert Frans wrote on 28. April 2014:

    Impressive!
    For me, these are the most beautiful Manger speakers I’ve seen up to now. There are a couple of things I would like to know before building these babies. I guess the Manger Zaehschaum and acoustic foam isn’t available anymore. Do you perhaps have an alternative acoustic dampening of the Manger and the woofer chamber.
    Is the Mangerbox made of 18/19 mm or 22/25 mm MDF?
    Abacus uses the cheap 20 cm, 4 Ohm Visaton woofers in their Manger speakers. I think I will experiment with these in your enclosures and mount them on the outside.
    Tip: take a look at http://www.abacus-electronics.de, click on Produkte>Bauvorschlaege>optimale Ausfraesung fuer Manger Wandler. The front bafffle must be at least 22 or 25 mm I guess.
    Well that’s it for the moment Mathias.

    cheers,
    Albert

  4. matthias wrote on 09. May 2014:

    Hi Frans

    Sorry for the slow response. When I built the Mangerbox I experimented with the Manger Zähschaum and the classical acoustic foam (“Noppenschaumstoff”). I found hardly any difference of the measured performance, and I could not hear a difference. I ended up using the Zähschaum just because I had it, and it “was made for the MSW”.

    The box is made from 22mm birch ply.

    Thanks for the Abacus link, looks interesting. Note that I tried 3rd and 4th order filters with the Mangerbox, but my ears clearly preferred the 2nd order filter.

    Matthias

  5. Albert Frans wrote on 14. May 2014:

    Hi Matthias,

    About the DSP settings for the MSW filters.
    Did you apply high or low shelving filters at 4180 and 2165 Hz for the MSW and why?

    greetings,
    Albert

    • matthias wrote on 03. June 2014:

      Hi Albert

      The shelving filters attenuate the high frequency range to get an overall flat frequency response.

      Cheers
      Matthias

  6. BMF wrote on 27. December 2014:

    How much do the components cost to build this speaker?
    What is the purpose of the star overlaying the driver?
    Thanks

    • matthias wrote on 28. December 2014:

      Hi BMF

      Do you want to buy a pair of these?

      A Manger driver is about 900 Euros. Prices for HiFi Akademie amplifiers and filters are available on hifiakademie.de (prices depend on the degree of DIY you are putting in). My enclosures were made by a professional carpenter, so they were expensive. Add some bits and pieces like plugs, cables, damping materials (but NO PASSIVE X-OVER FILTER PARTS!).

      The star is part of the Manger driver. It reduces reflections of bending waves at the edge of the driver, so that bending waves travelling from the center to the edge don’t get reflected back to the center.

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