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Conflicting Ohms Concern

BJMtz

BJMtz

Oct 18, 2010
540
404
Columbus, OH
#1
A trip back home for Thanksgiving resulted in my parents forcing me to clear their house of all my old music gear. Part of this gear in an older Fender Bassman 100 combo amp. It’s the solid state tilt-back combo. I have no need for it so I think I’m going to fix it up then donate it to a school or something. The 15” woofer is busted and here’s where the problem is: the manual says both the power amp output and the woofer are 4 ohms but when I took the speaker out it says it is 8 ohms. I haven’t tested the speaker with a meter yet but that is my next step. Is there a way to test to output to see if it in fact is 4 ohms? I plan on buying a new speaker and I assume I could get an 8 ohm and be safe but I would like to get a 4 ohm in there if possible.
 
#2
Don't worry about the old speaker too much. Concentrate on finding a 4 ohm driver that will work well in the cabinet. How much cabinet volume is there to work with?
There are plenty of folks here who can help you determine which is the best driver for your amp, cab and budget.
Thanks for considering giving the amp to a school music program. They will really appreciate it.
 
#3
The Bassman 100 does not have an output jack for an extension speaker, correct? In that case you would want to get a 4 ohm driver to get the most out of the amp. The other option would be to use another 8 ohm driver and add a jack for an external speaker.

4 ohm 15" drivers don't seem to be as common as 8 ohms. Without the benefit of having cabinet dimensions, here are some candidates:
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#5
abarson said:
The Bassman 100 does not have an output jack for an extension speaker, correct? In that case you would want to get a 4 ohm driver to get the most out of the amp. The other option would be to use another 8 ohm driver and add a jack for an external speaker.

4 ohm 15" drivers don't seem to be as common as 8 ohms. Without the benefit of having cabinet dimensions, here are some candidates:
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Click to expand...

Correct, no output jack. Adding one in is an enticing option, I don't think it would be too difficult to do but I would definitely need some assistance in that.
The CA154 is actually one that I was looking at for it.
 

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