Planar Speaker Asylum

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Planar Speaker Asylum

The Line Array I want to build will have....

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In Reply to: RE: Yes, I would have tried them too... posted by Satie on July 12, 2016 at 19:37:51

4 Neo8's and 6 Silver Flute 6.5 drivers. This configuration gives me the perfect level match with these drivers. The Xover with be a 1kz 1st Order Butterworth. Sensitivity should be around 98-100db.

Thank You for the suggestions and info. I really appreciate it.

Follow Ups:

RE: The Line Array I want to build will have.... - josh358 07:44:31 08/08/16 (0)
How well do you find that the cones match the sound of the Neo8's?
RE: The Line Array I want to build will have.... - Satie 06:27:16 07/13/16 (4)
As audiofred noted, the output of the array only adds up at the bottom frequencies. You will not get 98db sensitivity, it will be over 91db but not by much. Adding further drivers to a line of 6 drivers or more will increase sensitivity slightly but more significantly will give you the option of crossing over at a lower freq.

Fortunately for you, the silver flute woofers will not add up that way either, so what you would obtain by a line of 6 will not be much more than what you get from the single driver - within the spec operating range. However, you will obtain much deeper bass extension and power handling..

Most significantly, by increasing the length of the Neo8 array you get more coherent line array performance, less of a resonance peak (8 or 9 drivers will eradicate it completely) and the option of crossing over closer to 200 hz, thereby hitting the holy grail of midranges - covering the entire fundamental and 1st harmonic range of female voice violin and the bulk of the non-bass instruments. This would also allow you to use 1st order filters.
- RE: The Line Array I want to build will have.... - Satie 06:45:46 07/13/16 (3)
  PS Unless I missed it, you did not mention a tweeter The Neo8 does not disperse well enough into the top octave. It's FR also rolls off at 14khz. though it still has substantial output at 20khz. You will need at least a single ribbon tweeter in the middle of your array of neo8 or beside the array at the center. .
  - I do have a pair o BG Neo 3PDR's if needed.... - Cougar 07:49:30 07/13/16 (2)
    for this project. It would be good to use them and not let them just sit used.
    
    I'm just puzzled that the BG NEO8's would need a tweeter. The line arrays Danny Ritchie LS9 design and some others have done with the Neo 8's don't use a tweeter in their designs. Maybe they used some sort of correction circuit in their xovers to help bump up those areas that roll off?
    
    As far as the 1st xover point that can be adjusted. It's just a starting point that I choose since Danny Ritchie used a Xover at 1khz in his LS9 from what I read. But I was wanting do something lower.
    
    I have one of those Virtual Crossover Box that I can change values on the fly and add components to it to help tweak any xover design I want to try. I has been a good tool to use and have saved me a lot of time and money in doing some xovers. :)
    
    I will be using some software my buddy is sending me to take measurements once it's up and running and make the xover adjustments as need to help out any rough spots. I will be using Erse caps and Coils since I have got good results with them and they don't break the bank like the other expensive caps and coils.
    
    Thank You for the info and advice. I really appreciate it.
    - RE: I do have a pair o BG Neo 3PDR's if needed.... - Satie 15:27:18 07/15/16 (0)
      Another thought, you can try using some commercial line array designs as a guide to driver placement if you are not doing full length lines. The Infinity RS2b is one to look at with the short mid and tweeter arrays besides each other. Another planar short line array is the VMPS RM30 and RM40 with the tweeter placed up top. I actually don't have an example of a commercial short array design with a center mounted tweeter in line with the mids so there is likely a good reason for that, most likely that most of what you hear from the array comes from the center drivers. So those can't carry different frequencies than the rest of the array.. .
    - RE: I do have a pair o BG Neo 3PDR's if needed.... - Satie 14:32:44 07/13/16 (0)
      The version of the Neo8 that does not need a tweeter is the PDR version as audiofred had used in his project. It has an acoustic lens that improves dispersion at the expense of low end extension and power handling. I think the LS9 was using that but I don;t know that with certainty.

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