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Ohm of SWR Megoliath Driver (oem) ??

Discussion in 'Amps and Cabs [BG]' started by Joseph Sheldon, Oct 10, 2009.


  1. If this is buried some place here in another thread I apologies. I need to know soon a.s.a.p. there are some Eminence drivers for sale on EBay and I would like to pick them up to replace at least one if not two drivers. O.K. so I bought the 8/10" Megoliath used for $400 and it looked perfect. We it's not, I got my Mesa Titan back from Mesa (it was getting repaired) and I plugged it using two Speakons one for the top 4/10's and one for the bottom 4/10's to have an 4 ohm tottal load on the head since each section on the SWR is 8 Ohms. Well my head started shutting down for a few seconds and coming back. I thought mesa screwed up. Not the case, I put my Titan on top of my Mesa 4/12" neo and I haven’t has a problem since. The logical issue with the SWR is 1 or more drivers are toasted causing a dead short or a 0 ohm load and the head was going into protection mode as it should. So I have a multi-meter and I'm going to the studio today to find out which driver is a turd but I would like to get some of the eminence drivers that are cheap right now. Long story longer are the drivers 8 or 16 ohm??? I think the SWR OEM is 16 but I want to be sure....Thanks for any help:help:
     
  2. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
  3. I know but it's my back-up cab and I think they are eminence delta's but I just need the ohm please.
     
  4. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Since you're going to use a meter to test for a dead driver why not use it to measure a good one? DCR will be about .7 times the impedance.
     
  5. If each section of 4 drivers works out to 8 ohms they can't be 16 ohms each. They will be either 8(wired series-parallel) or 32(all wired in parallel).
     
  6. Well I went to my studio today and pulled the drivers out and used a multi meter on each to make sure nothing was cooked. My multi meter indicated all drivers with a resistance reading of 4.8 to 5.6 ohms. They all responded the same way on the meter and all drivers were marked 8 ohm. Now I have been told the amp see’s something different that a multi meter and the readings on the meter will usually be a bit lower. I checked each driver, all the same readings. Lower than the spec but all the same. I then tested the cab as a whole. It’s supposed to be a 4 Ohm load when ran together and it read 3.2 to 3.6 it jumps around a little but that what it read so it is a little lower than the spec. I think my Mesa which has a switch on the back of it for 4/8 or 2 ohm operation didn’t like the 3.4 load when switched to 4/8. I have 2 Titan heads so I’m leaving the one on top of my Mesa 4/12 where it had no issue shutting down. When my other head comes back from the repair department in two weeks from Mesa I will switch that head to 2 Ohms and see how it goes…thanks everyone I’ll let you know what happens if you care.
     

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