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Thread: Bi -amping Jbl 4435s with 5235

  1. #1
    rvito
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    Bi -amping Jbl 4435s with 5235

    Hi Folks. I just bought a real nice 5235 with 4430/4435 cards and I am going to try this on my 4435s, Krell Kct preamp , Fpb400cx and Ksa 300 amps. Any suggestions for set up, cables ? Thanks for any suggestions.

  2. #2
    Senior Member Ed Zeppeli's Avatar
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    Interested to hear your thoughts on the results as I have a a 5234A in the mail for my 4430s.

    I have my speakers set-up pretty well right now but thought I'd give it a shot.

    From what I understand, a good starting point for set-up is to position an SPL meter at the mid point between the low and high frequency drivers and equalize the output running a 1000 Hz sine wave. This should get you a proper balance between the drivers.

    Good luck,

    Warren

  3. #3
    rvito
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    also do I need to change my xlr cables pin configuration as pin 3 is + on the 5235 vs pin 2 on my Krell equipment ?

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    Senior Member Ed Zeppeli's Avatar
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    Quote Originally Posted by rvito View Post
    also do I need to change my xlr cables pin configuration as pin 3 is + on the 5235 vs pin 2 on my Krell equipment ?

    Definitely don't want to hook up standard cables then. Does the 5235 also have a terminal strip input or just XLR?

  5. #5
    rvito
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    both

  6. #6
    Senior Member martin2395's Avatar
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    You have an amazing high-end Krell setup and want to use the 5235?
    The UREI xover is only good for testing, otherwise it's garbage sonically.

    I went through the 5235, then a modified BSS FDS360 and now I settled on a Bryston 10B. Day and night difference between all 3.

  7. #7
    Senior Member Ed Zeppeli's Avatar
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    Here's a link to a thread on the pin-outs of the 5235 for your perusal.

    http://www.audioheritage.org/vbullet...ighlight=5234a

  8. #8
    Senior Member grumpy's Avatar
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    You can use a standard XLR cable -in- (absolute polarity will be inverted), but
    the output is not balanced; pins 1 and 2 are connected to ground. If your amp
    is ok (probably) with one leg of the balanced input shorted, then you could
    still used a standard XLR cable -out- and the now-inverted signal would be
    going to the negative pin input on the amp ... and now follow original polarity.

    Simple, yes?

    If it were me, I'd modify a standard cable or build one with a pin 2-3 crossover
    for the input, and go unbalanced off of the terminal lugs to the amp... easier to
    follow later and most balanced amps seem to indicate they'd be happier with
    the positive input being driven and the negative input grounded (if driving with
    an unbalanced signal)... might ask your krell dealer. Power amps on last.

  9. #9
    rvito
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    So could I take say the input xlr plug going to the 5235 and swap the wires on pins 2 and 3 and also do the same on the output xlr an leave end at the amp standard. please bear with me as i am kinda new at this

  10. #10
    Senior Member grumpy's Avatar
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    Yes.

  11. #11
    Senior Member Ed Zeppeli's Avatar
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    ...and don't forget to work that bi-amp switch back and forth a few times first to help make good contact.

  12. #12
    Dang. Amateur speakerdave's Avatar
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    Quote Originally Posted by martin2395 View Post
    You have an amazing high-end Krell setup and want to use the 5235?
    The UREI xover is only good for testing, otherwise it's garbage sonically.

    I went through the 5235, then a modified BSS FDS360 and now I settled on a Bryston 10B. Day and night difference between all 3.
    Interesting. What speakers are you using?
    "Audio is filled with dangerous amateurs." --- Tim de Paravicini

  13. #13
    Senior Member grumpy's Avatar
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    Mmm... Post #1 (4435)

  14. #14
    Senior Member Ed Zeppeli's Avatar
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    Different guy.

  15. #15
    Senior Member martin2395's Avatar
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    4343 with 2235/2123/2450/2405 and CC'ed 3155 crossovers with Audyn Caps + Mundorf Supreme and also Krell amplification.

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