4x10/2x15 Mono/Stereo Electric Cab Wiring HELP!!!

Discussion in 'Amps and Cabs [BG]' started by IngloriousOz, Jan 15, 2009.

  1. IngloriousOz

    IngloriousOz Supporting Member

    Jun 1, 2006
    SLC, Utah
    Please help me sanity check this before a potentially costly wiring mistake!

    I purchased this cab a bit ago, it came with a nifty 2 1/4" jack plate with a mono/stereo switch. Unfortunately the switch was defective so I installed this 3 1/4" plate instead.

    The plate is setup so that I should be able to chain the bottom 1/4" into either of the top two...giving me a total 8 Ohm load. 16 ohms from the top 4 speakers and 16 ohms from the bottom. I tried to color trace the wiring via Microsoft Paint so please forgive me!

    -The 215s are eminence kappa 15a's (each 8ohms-wired in series)
    -The 410s are eminence delta 10b's (each 16ohms-series parallel)

    Here's the fun part...with my digital multimeter im getting a reading of 11.5Ω from all three 1/4" jacks tested from a 3 foot 16g speaker cable (should be closer to 16Ω right??). And when I hook it up as a single mono cab i'm getting about 5.4Ω-5.6Ω reading from either of the top 2 (should be closer to 8Ω right??) I know the multimeter is never going to show me 16Ω and 8Ω exactly but i've always understood it would be about 2Ω's off at most?

    I've phase checked the top and bottom half of this huge single cab and all the speakers are functional. Im pretty sure my wiring is correct, are the low Ω number readings due to the additional speaker cabling?

    Please help!
  2. Most 16Ohm Speakers will read 12.6 Ohms or so if they are good while most 8Ohm Speakers will read 6.6 or so if they are good.
    What I would do is Ohm test each speaker individually and see what the read and then do the math and see if it matches the readings that you are getting.I havent seen a series parellel done like the 4x10 cab before im not sure that it is right.
  3. IngloriousOz

    IngloriousOz Supporting Member

    Jun 1, 2006
    SLC, Utah
    Could you give me the good word on how to accurately test each speaker individually?

    Which part of the wiring on that 410 seems funky?

    Thanks for the help!
  4. LesS

    LesS Guest

    Mar 3, 2006
    no longer a member
    The wiring looks good to me.
    A 11.5 reading is fine for an 16 ohm speaker load, and a 5.4 to 5.6 reading is fine for an 8 ohm speaker load.

    When you phase checked, did all six speakers move in the same direction?

    If they did, I think you're ready to go.
  5. IngloriousOz

    IngloriousOz Supporting Member

    Jun 1, 2006
    SLC, Utah
    They all did move together on the phase check, thanks for the heads up. That makes NO sense to me though on the 11.5 via 16 ohm reading...I was expecting 14 or 15 reading

    anyone can show me how to run the test on the speakers individually with the same multimeter? Do they need to be disconnected from the circuit?

    Thanks everyone
  6. Yes you have to have 1 wire or both disconnected then you set your DMM (meter) to the Ohm setting and read the Ohms of each speaker.
  7. just outta curiosity what kind of cab is that?
  8. IngloriousOz

    IngloriousOz Supporting Member

    Jun 1, 2006
    SLC, Utah