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Eden WTP-900 - Hypothetical Cabinet Configurations - Can I do this?

Discussion in 'Amps and Cabs [BG]' started by Evil Baby Jesus, Oct 7, 2018.


  1. I just bought a 2016 Eden WTP-900 to replace my
    Navigator + WT1250 that was stolen. I have an odd configuration of 3 cabinets:
    1 4ohm cab and 2 8ohm cabs
    I've been mixing and matching them in my WT1250 with no problem,
    but I understand the WTP-900 has lighted posts for specific configurations.
    This is copied from a 2016 post by seabreeze explaining the different options
    that light up when you press the "cycle" button on the back
    (I'm assuming it's accurate.. i don't have my amp yet!):

    8 = connect an 8ohm cab here
    4 = connect a 4ohm cab here
    X = do not connect a cab here

    In stereo mode:
    l:8+8
    r:8+8
    OR
    l:4+X
    r:4+x
    OR
    l:8+8
    r:4+X
    OR
    l:4+X
    r:8+8

    In bridge mode:
    l:8+X
    r:X+X
    OR
    l:4+X
    r:4+X
    OR
    l:8+8
    r:8+8


    Question 1: Can I run bridged like this?
    4 + X
    8 + 8
    It seems that in bridge mode, cabs within a channel draw in parallel
    (so 8+8 --> 4ohms), and cabs between L/R run in series, so 4L + 4R --> 8ohms.
    In that case, it should be just as happy with the configuration i proposed, right?

    Question 2: Can I run in stereo mode like this?
    8 + X
    8 + X
    OR
    4 + X
    8 + X
    This is most important for me, as this is the way I intend to use it most of the time.
    Since the channels are independent in stereo mode, and the connects are definitely
    set up in parallel in this case, and since the amp can handle a 4ohm load, I don't
    see why it would mind only having one 4ohm.

    Question 3: If i have it set to this in bridged mode:
    8 + X
    X + X
    What happens if i set it up this way with single 8ohm cabinet,
    but plug it into one of the other outputs? will it make a difference?

    Essentially I think I'm asking whether the cycle button actually does anything internally,
    or it is only to tell humans what configurations are ok?
    Many thanks to anyone who knows the answer!!
     
    Last edited: Oct 7, 2018
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    The only way you can use all 3 cabinets is in stereo mode, with your 4 ohm cabinet on one side and the 2 x 8 ohm cabinets daisy chained (parallel) on the other channel.
     
  3. Thanks for the reply, that answers one of my questions and I understand that's all that I can do officially according to the light configurations on the outputs of the WTP-900.

    But I'm really wondering if there are other "ok" configurations beyond what the lights allow.
    for example, in bridge mode, it seems that 4 in one side and 2x8 in the other side would result
    in the sample total impedance (8ohms). so the gist of my other question is whether you
    can outsmart the lights as long as the impedance is 8ohms in bridge mode?

    corollary: there's no problem with running in bridge mode with more than 8ohms, right?
    for example, I could run L8, R8 for a total of 16ohms (since I suspect impedance sums
    across channels in bridge mode). it wouldn't draw the full
    potential of the amp, but it wouldn't hurt it either?

    I'm in Davis CA also.
     
    agedhorse likes this.
  4. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Running cabinets in series if they are not identical can lead to unpredictable results because the electrical parameters can fight each other and really skew the results.

    With just 2 x 8 ohm cabinets, you would be better off IMO by placing one on each channel in stereo mode.
     
  5. Agreed, if i'm playing with 2x8ohm cabs, i'll want to run one per channel.
    but could i run it in bridge mode at 16ohms if i really wanted..?

    I understand that running different cabs in series can have weird results also.
    I have no real intention of doing so. i'm just trying to understand how it works.
     

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