Recent content by Uwe Riemer

  1. U

    B&C DCX464 vs DCX 354

    Since you asked so nicely: The 354 HF sounds a little bit like the BMS, which is absolutely not my cup of tea But the big difference which interestingly nobody seems to notice : 464 bands overlap, which makes passive crossover design pretty easy 354 bands underlap even without crossover
  2. U

    DIY a 40-20hz sub?

    20-40Hz is M-force territory the other question is integration into the system without creating tons of group delay
  3. U

    B&C DCX464 vs DCX 354

    464 is the best driver I have used so far for high SPL/Bandwidth 354 is not the same in a smaller package, it sounds very different
  4. U

    subwoofer advise

    Some thoughts: BP designs may look good in Sim, but what happens if the driver gets hot. The more SPL you try to extract from the enclosure design the more the response can change with drive level. Hornresp gives the option to simulate Power Compression. BR designs on the other hand are pretty...
  5. U

    B&C ME464

    I have no experience with the horns above, but to me the Limmer 250M looks like a solution being right in the middle regarding size. Could provide enough loading down low to cross over to your 2x15" section and still have good HF dispersion. If it wasn´t Covid time, I would try out myself.
  6. U

    60 Degree DIY Mid Hi - AKA PM60

    No delay needed to get good phase tracking.
  7. U

    Port obstruction

    Scrap wood is a lot of work to calculate volume, guess how I know. I´ve used milk ( comes in 1 liter handily ) and hard foam board like used for house insulation. Davids remark is important. Shortening the unused driver or connecting it to an amp without signal, probably slightly different...
  8. U

    Port obstruction

    Yes
  9. U

    Port obstruction

    internal standing waves
  10. U

    Port obstruction

    IMO you should reduce the volume for 12" drivers even further, something between 55 and 60 liter. I understand, that this might be difficult to achieve with your actual enclosure. Experimenting with damping material in different positions will show, if the 300Hz are
  11. U

    Port obstruction

    So you basically ended with a tuning similar to the suggested B&C design, which is probably a compromise for using the 12" fullrange, where it might be better to have at least some low end. For Top only application you are still waisting potential low/mid output. So whenever you find yourself...
  12. U

    Port obstruction

    In general general statements are wrong;)
  13. U

    Port obstruction

    Higher tuning by shortening the ports will help a little bit, but reducing the box volume would be way more effective in the frequency range from 80 to 150 Hz. But hey, if you only do light Jazz with the speaker.... Might be a good idea with this HF driver anyways
  14. U

    Port obstruction

  15. U

    Port obstruction

    Why do you need a "rule of thumb" when you have the enclosure at hand. Some high power ( up to the maximum intended power level ) long sine sweeps with the High Pass, you would like to use in the system, in place should reveal problems in the pass band by adding noise. Just low pass the signal...