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Planar Speaker Asylum

Has anyone used the active crossover kits from Elliot Sound Products to biamp their Magnepans?

174.28.196.50

I am considering the active crossover designs and circuit boards from Elliot Sound to biamp my MG-3a's and was wondering if anyone else has tried their crossovers and what your experience was with them.
Any construction tips or recommendations would also be of interest, such as enclosure used, etc.
Would appreciate your thoughts. thanks!

Edits: 08/25/15

Follow Ups:

Check out Marchand... - MWE 18:19:40 08/25/15 (0)
..especially since you're in the US. XM9 boards can be had for $70 each (and, I believe, can be ordered with different slopes), and they have good little PS10 power supplies. You would still need to put things in some sort of enclosure, bur probably likewise with the Elliots. You might also consider doing what I did with my 3.6s- active XM9 modules on the bass panel, and a passive line-level (single low-value capacitor in front of the mid/tweet amp, input impedances permitting) first-order M/T high-pass, replacing the external speaker-level capacitor bank.
Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

Edits: 08/25/15
RE: YES!! ... - andyr 17:06:21 08/25/15 (4)
I've been running my Frankenpans (and before that, MG-IIIas) 3-way active for about 15 years with Rod Elliot's active crossover PCBs.

If you just want to actively bi -amp, I think you need to buy only 1x P09 PCB to deliver 2-way stereo? Then you need a PS - Rod offers his P05, although I personally did not use his 'wall-wart' transformer concept but bought a 160VA toroid instead. :-)) (I believe in over-speccing the power transformer!)

Although the P09 is nominally a PCB designed for 12 or 24 dB slopes, it's easy to mod it slightly, to produce the 18dB LP on the bass panels.

Re. a case - currently, the P09 boards are in a custom-made case which also holds 3x amplifier modules (and their PSes). As you'll probably be building the XO+PS in a box by itself, you might like to consider the cases available from www.Modushop.biz in Italy - I use them all the time now, for a variety of hifi items. Andrea can do the drilling, engraving for you, if you supply him with a '.dxf' file (which you can output from MS Visio).

I have some of the op-amps I used, spare, if you're interested. PM me if you want to follow this up.

Good luck - I don't think you'll regret going active! :-))

Andy
- RE: YES!! ... - pictureguy 01:10:48 08/27/15 (3)
  Any way to torture the crossover into producing a 6db/octave slope?
  I would LOVE to duplicate as closly as possible the crosover now in my 1.6s
  
  12db low pass and 6db high pass crossing at 600hz. The 'knee' frequency is apparently lower for the low pass and higher for the high pass.
  Too much is never enough
  - RE: "Any way to torture the crossover into producing a 6db/octave slope?" ... - andyr 18:55:21 08/27/15 (0)
    Yes - it's easy!
    
    PM me so we can start an email conversation. (I already have the stock 1.6 XO modelled in lspCAD. I even have a spare P09 board or two!! :-)) )
    
    Regards,
    
    Andy
  - RE: YES!! ... - Roger Gustavsson 01:29:57 08/27/15 (1)
    Some ways of doing it: http://www.integracoustics.com/MUG/MUG/tweaks/davey/mg1.6xo.htm
    
    No need for an active leg for the high pass section. In most power amplifiers there is already a capacitor in the input stage for high pass filtering. You can replace that capacitor with a smaller/suitable value.
    - RE: YES!! ... - pictureguy 09:36:21 08/27/15 (0)
      The PLLXO is my 'default' idea. I believe my preamp will drive the 6 feet or so of cable to the crossover which would be located AT each amp behind the speaker. Maybe 18" cables from Cross-2-Amp. I should be able to live with the insertion loss.
      I've got a couple ALTOIDS tins which will make fine 'cases' for the crossovers.
      Preamp is essentially 100ohms OUTPUT impedance while the amp claims 33kohms INPUT.
      Maybe the Decimated Radio Shack stores near me will have a project circuit board, but I WILL send away for other parts.
      And a new Hakko iron.
      
      Too much is never enough
      http://www.amazon.com/Hakko-FX888D-23BY-Digital-Soldering-FX (Open in New Window)

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