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Post by browndog on Jul 27, 2008 14:22:44 GMT -7
I have an openback Z cab with 2 12s - wired at 4 ohms. I have a combo amp with one 16 ohm speaker and the amp has an impedance switch - 4, 8 or 16; it also has an extension speaker jack. If I want to use the combo amp (and its 16 ohm speaker) and plug my 2 12 Z cab in to the amp's extension jack, where should I set the impedance switch so that the combo's speaker and the speakers in the Z cab can both be used without harm - 4, 8 or 16 ohms?
Thanks. With tone and oneness, Mike
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Post by T-R☼CK ♫ on Jul 27, 2008 14:38:24 GMT -7
It sounds to me like you should: Disconnect the amp's speaker and use the 4 ohm setting on your amp. OR, since you didn't mention the brand, and it DOES have an impedance switch, assuming the switch applies to the extension jack only....Use both and set the switch for 4 ohms. However.....I am not responsible for any smoke that may come from the back of your rig.... ;D Don't you just love a smart assed reply??..Honestly, without knowing the particulars of your amp, I would let my ears be the judge there. Try it with the switch set at 4 ohms. If there is no discernable difference in the highs/lows/breakup etc...You should be good. Lawd knows, in my youth I pushed Ohm's law to the max and beyond w/out any permanent damage to my stuff.
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Post by benttop (Steve) on Jul 27, 2008 15:07:43 GMT -7
Yeah, assuming your extension speaker jack is in parallel, you would be putting a 4 ohm load in parallel with a 16 ohm load, resulting in a 3.2 ohm load. The best you can do is use the 4 ohm tap and keep an eye on how warm your output tranny is getting. That's not an ideal setup from the impedance standpoint. But there is something else. You'll be sending 4/5ths of the power to the 4 ohm load and 1/5 to the 16 ohm load. I doubt you'll even hear the combo speaker.
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Post by T-R☼CK ♫ on Jul 27, 2008 15:54:50 GMT -7
As usual....What Steve said....
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Post by browndog on Jul 27, 2008 18:14:00 GMT -7
Thanks guys.
With tone and oneness, Mike.
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