This is NOT OK! The power amp will eventually overheat and fail.
Here's another formula: To figure out the total impedance of two or more cabinets of equal value hooked up
in parallel, divide the impedance of one cabinet by the number of cabinets:
Impedance of one cabinet / number of cabinets = total impedance
(For an even more in-depth discussion of impedance and power rating issues, go to the SWR Website at
www.swrsound.com, click on "Support", then click on "Technical Articles," then click on "Plug and Play - Setup
Tips for Amps and Speakers"-an article by SWR founder Steve Rabe that ran in the August '92 issue of Bass
Player Magazine.)
WORKINGMAN'S 2X10C POWER DELIVERY CAPABILITIES (Power Ratings)
After determining how the extension cabinet you wish to use affects the total operating impedance, you need
to take into account the power handling capabilities of that speaker cabinet as compared to what the
Workingman's 2x10C can deliver at that operating impedance. Those ratings are as follows:
260 Watts @ 8 ohms (internal speaker system only)
400 Watts @ 4 ohms (internal system with one 8 ohm extension cabinet)
So if you use an 8 ohm extension speaker cabinet along with your internal speaker system, it will get up to
200 watts of power (400 watts split in half), and more during transient peaks. Make sure your extension
speaker cabinet can handle the power.
There is also the situation known as
underpowering
