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  1. #1

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    Default X-over modification Question

    My speakers have an external, high level X-over. I also have schematics and some decent soldering skill. How difficult would it be to modify the X-over from handling high level to line level inputs and output the same?

    Should I just start over with the schematics and build from scratch? My concern is the output impedence causing a screw up in the X-over and popping parts. My EE is getting rusty so I'm looking for input from someonw whose done something like this or can use the schematic to give me an idea of mods needed.

    The X-over is the external portion of the belows. I believe I have the rev 1, but I can't be sure untill I get back home.

    I'm hoping this is just a case of adding RCA plugs and a resistor...

    Purpose: Active bi-amping
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    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin

  2. #2

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    The inductance coils, and capacitor values are set to work with the impeadance
    of your drivers to achive their cross over freq. If you try coping this to make a line level crossover to place inbetween your pre. and your amp the frequency(s) are going to be way off due to impeance mismatch (going from 4 or 8 ohms on the speakers to 10k+ohms on the electronics. at least thats what I seem to recall from my 4 months of electronic classes.
    Speakers:SDA2a, sub:Atlantic Technologies 172 PBM
    Pre:B&K PRO-10MC(2ch)
    Amps:Parasound HCA 1000a
    SourcesOppo DV-970HD, Xbox360, Kenwood KT-5300
    Cables:Philips/RCA/Monster

    Life's short, Listen to SDA's
    Life is short live Sui Juris
    Where did SOPA go?

  3. #3

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    That's my concern. However, the high ohm levels would be on each side of the crossover. How that affects the circuit beyond limting current flow, well, I left Pspice in my other computer and I am not pulling out my circuits book if I can help it.
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin

  4. #4

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    Just a follow up, tried this out. High's make it through, mids and bass are barely audible.
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin

  5. #5

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    whats speakers are you playing with, the maggies? or a diy project
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  6. #6

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    The maggies external X-over.
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin

  7. #7

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    Quote Originally Posted by jdhdiggs
    How difficult would it be to modify the X-over from handling high level to line level inputs and output the same?

    Purpose: Active bi-amping
    You should call or write the speaker manufacturer. In addition the the bi-amping modification, they might also be able to provide other performance enhancement tips.

  8. #8

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    Did you try searching the MUG (Magnepan User's Group) forum or posting there? Check out the tweaks section.

    http://www.integracoustics.com/MUG/MUG/

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