Cab Ohm question...urgent help..thank you

  • Thread starter Thread starter suhrimmetal
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suhrimmetal

suhrimmetal

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Just recieved my Bog 4x12 and 20th Anniversary XTC. I measured the Ohm's on the cab using a voltmeter and speaker cable and it came out right around 13.5ohms. Does this mean my cab is 16ohm?? I just want to make sure I run my amp at the right impedance as well...Amp at 16 or 8ohm?? Any help would be appreciated. Thank you

Cory
 
suhrimmetal":8ckd18fa said:
Just recieved my Bog 4x12 and 20th Anniversary XTC. I measured the Ohm's on the cab using a voltmeter and speaker cable and it came out right around 13.5ohms. Does this mean my cab is 16ohm?? I just want to make sure I run my amp at the right impedance as well...Amp at 16 or 8ohm?? Any help would be appreciated. Thank you

Cory
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Multimeters aren't very accurate at such small resistances. Your cab is 16 ohms.

How are you liking the amp?
 
Thank you bro... I seriously JUST got my new rig and ohm'd it out...I will fire her up here shortly but I will let her breathe tonite at rehearsal and see how she sounds. Won't have much time to play with her tonite, but very soon...the affair has begun.
 
Your fine. My cab reads 6.8 ohms. It always seems to be lower. There is a plus/minus tolerance with the speakers as well.
 
over the years I have found that cabs/speakers rated at 16 ohms will measure more than 8 and less than 16, 8 ohm will measure more than 4 and less than 8, and 4 ohm will measure more than 2 and less than 4. I guess that's where the term "nominal" comes into play.
 
With the DMM, you are measuring resistance. This takes into account the loss in wiring, connections and cables. This is different than impedance, but close enough of a measurement to make sure you have it wired correctly. For a 16 ohm cab, you will normally see 13.6 to 14. For an 8 ohm cab, around 6.8 to 7.2 on 412's. For 212 cabs, you will see 15's and high 7's.

If you are installing used or vintage speakers, check them individually at the terminals before wiring them up. Over time, it changes.

Steve
 
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