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i dont think you will get a big improovement

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angeloitacare

In Reply to: RE: Questions regarding Community M200A compression drivers posted by PK on August 07, 2007 at 10:27:22

hello Peter

i understand that to go the way Avantgarde goes with the community and the beyma is a winning and attractive design, and you want improove your system, and think replace the bms could give better results. however : the bms does best exactly what the community does : the midrange. the weak part of your system is the mid-bass, and high frequency section. i would make a rectangular tractrix mid-bass horn , wich is not so expensive,and use a Ciare 8.5 Nd MR, wich you can get cheap at great plains audio, disconnect the tweeter of the bms. the jbl 2405 ore beyma copy do a very good job, you can use it above 7khz. you will not spend a lot , but improovement of yous system will be considerable. cutoff at 300hz is the worst, as you have the most music information at this frequency region. the best is to use a midbass channel that covers between 150hz and 1khz.

best Angelo

Follow Ups:

RE: i dont think you will get a big improovement - PK 04:28:17 08/10/07 (2)
Hi Angelo,

Thanks for your reply. I have already disconnected the tweeter section of the BMS coax and replaced it with a vintage Fostex T828 slot tweeter. This was clearly an improvement although I had to pad the BMS mid somewhat down. I have also thought about the "midbass approach" and actually bought a pair of 8" Fane Studio 8M second hand for that purpose that I incidently stumbled across. However, building a, say 150 Hz, mid horn is no simple task - at least not to me:-)

Kind regards
Peter
- RE: i dont think you will get a big improovement - angeloitacare 08:52:54 08/10/07 (1)
  hello Peter
  
  than you are in the right direction. i bought a pair of jbl2405's, as they are a economic and good alternative to fostex tweeters, and also i have the original jbl crossover plan, so i can just utilise it for the tweeter network. i found also a fane studio8m, so my combination will be similar to yours. but i will replace the orphean horn completely.
  i dont think, if you made you big basshorn, you will have much trouble to make a square mid-bass horn, it is not expensive. if you want to use a community driver, just write them, i did it, they do export without any problem.
  
  best angelo
  - RE: i dont think you will get a big improovement - PK 09:49:51 08/10/07 (0)
    Hi Angelo,
    
    The problem regarding the Community drivers may not be to get them (although I have heard that the M200A version has been discontinued) - but if I can't take them lower than 400 Hz (note my original post), then I doubt that my bass horns will sound good that far up in frequency.
    
    Regarding making a pair of mid bass horns: To me it really is no simple task; I only drew the bass horns I have, I did not make them!
    
    BTW: Do you have the Mk II version of the crossovers for the Orpheans?
    
    Kind regards
    Peter

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