High Efficiency Speaker Asylum

RE: will a DE250/clone or BMS4550 safely run on a 511 @500-800 with 2nd order passive crossover?

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tomservo

M

In Reply to: RE: will a DE250/clone or BMS4550 safely run on a 511 @500-800 with 2nd order passive crossover? posted by freddyi on January 14, 2016 at 21:32:10

Yes, i used a 4550 rebuilding an A-7 about 12 years ago and the result was you get about an octave more hf and greater sensitivity. Also, by moving the 511 back about 2 inches and using an purpose built crossover, one could get flat response and a Synergy horn like response (little or no crossover phase shift). At home levels a 2nd order should be fine.
I have pictures, schematic and measurements somewhere as i was going to try to write a "how to" something.
Best
Ton

Edits: 01/15/16

Follow Ups:

RE: will a DE250/clone or BMS4550 safely run on a 511 @500-800 with 2nd order passive crossover? - freddyi 00:33:36 01/16/16 (5)
that's way cool to get that level of coherence - wonder how low a really cheap DE250 clone such as Dayton can be pushed on a 511? - I might try one at low power and look for distortion - hopefully it'll distort before bottoming

I've got a Frazer CAT40 which sounds like its alignment is good but never can see a square wave

Karlson Evangelist
- The Dayton D250P recommended... - Cougar 22:12:22 01/16/16 (4)
  Lowest xover point is 1Kz. They like 1.2Kz, sounds better.
  - RE: The Dayton D250P recommended... - freddyi 15:48:44 01/17/16 (3)
    thanks Cougar - so even with a long, relatively slow horn as a 511, they aren't happy below 1K - - I have some D250P - probably use one first on a K-tube which provides no gain - hope it can handle 1K6 xover in that state. What waveguides and highpass have you used with D250P?
    Karlson Evangelist
    
    Edits: 01/17/16
    - I used the Dayton D250P with.... - Cougar 17:58:45 01/17/16 (2)
      the QSC horn from Parts Express. I had it Xover over at 1.2Khz and 1.5kkz. Worked well at both xover points.
      I currently getting ready to use them in a 2 way system with the QSC and the MCM 55-2963's. Those woofers are supposed to be close copies of the JBL 2226's Everyone raves about their upper mid bass production.
      
      Edits: 01/17/16
      - RE: I used the Dayton D250P with.... - freddyi 18:21:14 01/17/16 (1)
        
        In Reply to: RE: I used the Dayton D250P with.... posted by Cougar on January 17, 2016 at 17:58:45
        
        thanks - I've got that QSC - are you going with an Econowave xover for the new project? great looking cone on those MCM ! - wonder what qts. fs and vas they exhibit?
        Karlson Evangelist
        
        Edits: 01/17/16 01/17/16
        
        Qts is.... - Cougar 20:52:40 01/17/16 (0)
        
        In Reply to: RE: I used the Dayton D250P with.... posted by freddyi on January 17, 2016 at 18:21:14
        
        .39, fs = 32, and Vas = 286 liters
        
        Yes, I will be using an Econowave Xover with these. should come out nice. :)

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