Mark_ii Posted April 27, 2012 Share Posted April 27, 2012 If I have an 8 ohm cab and a 4 ohm cab can I run them together through a dual channel amp e.g. the Genz Benz Shuttle Max. I know you can run 2 x 4 ohm loads on this amp but I'm not sure if it is ok to run 2 dissimilar loads on the 2 channels ? Any input and comments would be greatly appreciated. Many thanks, Quote Link to comment Share on other sites More sharing options...
Lozz196 Posted April 27, 2012 Share Posted April 27, 2012 I`m sure I`ve read on here that if you do this, the load will be about 5.6 ohms, so in theory that should be ok. However I`m not sure if I`d do it myself, as I don`t really understand the full techie stuff and would be worried about messing things up - but am sure someone will be along soon to provide accurate info. Quote Link to comment Share on other sites More sharing options...
xgsjx Posted April 27, 2012 Share Posted April 27, 2012 (edited) Yes. According to the website, you can run a 4Ω cab on amp A & an 8Ω cab on amp B. Bear in mind that the 8Ω cab is gonna get 375 watts & the 4Ω 600w. Edited to check: It is the S Max 12 you have? Edited April 27, 2012 by xgsjx Quote Link to comment Share on other sites More sharing options...
flyfisher Posted April 27, 2012 Share Posted April 27, 2012 [quote name='Lozz196' timestamp='1335517844' post='1632391'] I`m sure I`ve read on here that if you do this, the load will be about 5.6 ohms, so in theory that should be ok. [/quote] I'm not familiar with that amp but if it's two separate power amps (channels) then I can't see a problem as it's just like having two separate amps only they're in one box. I don't understand the 5.6 ohms thing though because the two speakers would not interact with each other. One channel would be driving into 8 ohms and the other into 4 ohms, with the power implications that [b]xgsjx[/b] described above. Quote Link to comment Share on other sites More sharing options...
xgsjx Posted April 27, 2012 Share Posted April 27, 2012 I think a 4Ω & 8Ω load combined is 3.2Ω. It wouldn't apply to that amp though, unless you put both cabs on the one channel (such as all on amp A) & then you would risk damaging your amp. Quote Link to comment Share on other sites More sharing options...
icastle Posted April 27, 2012 Share Posted April 27, 2012 [quote name='xgsjx' timestamp='1335527067' post='1632606'] I think a 4Ω & 8Ω load combined is 3.2Ω. [/quote] Closer It's actually 2.67Ω Quote Link to comment Share on other sites More sharing options...
leftybassman392 Posted April 27, 2012 Share Posted April 27, 2012 [quote name='icastle' timestamp='1335547011' post='1633053'] Closer It's actually 2.67Ω [/quote] Yup. For parallel connections you get 1/8+1/4 = 3/8 , then turn the result upside down to get 8/3 = .... For future reference, the formula for 2 parallel connections is [i]1/R[sub]1 [/sub]+ 1/R[sub]2[/sub] = 1/R[sub]n[/sub][/i] where R[sub]1[/sub] and R[sub]2[/sub] are the the individual values and R[sub]n[/sub] is the resulting net impedance. Quote Link to comment Share on other sites More sharing options...
Lozz196 Posted April 28, 2012 Share Posted April 28, 2012 So it was 2.6 I was remembering - I knew there was a third digit but that one completely escaped me. Quote Link to comment Share on other sites More sharing options...
leftybassman392 Posted April 28, 2012 Share Posted April 28, 2012 [quote name='Lozz196' timestamp='1335579440' post='1633439'] So it was 2.6 I was remembering - I knew there was a third digit but that one completely escaped me. [/quote] To be totally and unnecessarily pedantic, it's actually 2.6 recurring. That means you write down as many 6's as you can be bothered with, then top it off with a 7. It means (quite literally) almost nothing in the real world, but I thought I'd say it anyway. Quote Link to comment Share on other sites More sharing options...
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