High Efficiency Speaker Asylum

BMS 4592 ND might be good to 300 Hz....

73.242.169.18

Ivan303

In Reply to: RE: BD-Design Orphean posted by Don Reid on July 25, 2023 at 08:10:04

But would your Tuba be good to 300Hz?

I have two Table Tuba 'Longs' doing Sub work for my Edgar Horns but doubt they would be ideal all the way up to 300Hz?

"Reality cannot exist because it cannot keep up with the lies on the Internet."

Follow Ups:

RE: BMS 4592 ND might be good to 300 Hz.... - Johno 17:38:05 07/25/23 (6)
If you look at the attached URL under download they sho curves and what the response looks like at 110db with a passive crossover, and the driver roll off at around 700Hz. At 300Hz it appears to be 15db down, so some sort of EQ would be required to fill that hole.

Cheers
- https://www.bmsspeakers.com/index.php-69.html?id=bms_4592nd (Open in New Window)
- RE: BMS 4592 ND might be good to 300 Hz.... - tomservo 16:00:18 08/01/23 (0)
  Remember the horn length is a major controller of how low the horn will load the driver. Figure it has to be 1/4 wl minimum and efficient operation begins about 1/2wl.
  
  I have use this driver in products and also the B&C coax driver which is actually easier to make an ideal crossover between mid and high with than the BMS coax. Both can get down to 300Hz but takes a big exponential (curved wall) horn.
- Worse than that.... - Ivan303 06:53:39 07/26/23 (4)
  On the chart I downloaded it doesn't even show 300 Hz, has an impedance peak at 350 Hz and the graph stops at 400 Hz at about 8dB down from the 110dB marked on the chart?
  But...
  They claim 300Hz to 7000 Hz for the mid compression driver.
  They don't say what SIZE horn only 90 deg x 60 deg.?
  Would Bert's HUGE horn make a difference?
  
  "Reality cannot exist because it cannot keep up with the lies on the Internet."
  - BMS 4592 ND data sheet (Open in New Window)
  Edits: 07/26/23 07/26/23
  - RE: Worse than that.... - Retsel 14:06:06 07/27/23 (1)
    It has to the horn design - both a lower expansion of the throat, and size of the mouth, or else Cut-Throat would not get 115 db out of them, and a cutoff at 270 hz.
    
    Retsel
    - Certainly would be my guess... - Ivan303 17:46:28 07/27/23 (0)
      As their specifications say 300Hz and the graph shows nothing after 400Hz and that down 15dB (if the y axis is 2dB per line?)
      
      "Reality cannot exist because it cannot keep up with the lies on the Internet."
  - RE: Worse than that.... - Johno 16:46:00 07/26/23 (0)
    Attached image.
    Cheers
  - RE: Worse than that.... - Cut-Throat 16:36:27 07/26/23 (0)
    I have no problem crossing this driver with my Orphean Horn to 270 Hz... Bert Of Oris says that you can go as low as 242 Hz., if you want to.

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