Impedence is resistance and its present in may different places on the system. Your subwoofer driver itself has an impedance, likely of 4, 6 or 8 ohms, as the load it presents to the amplifier. Kind of the same thing as the load a muffler puts on an engine, make sure you use the right resistance or it won't run right...You can use a standard autoranging multimeter to check it, disconnected from the amp of course.
My guess is you either have a bad woofer and are looking to replace it with something generic, not the PSB one that costs way too much as a part, or you want to add separate woofers to the amp to make more bass. Fun stuff to play around with, just be sure you understand the math that allows you to make changes and how series wiring and parallel wiring changes impedance and that if you get it wrong, you will cook that little PSB Chinese amp.
In series, speakers wired from +to-to+to- add, so a 4ohm plus a 4 ohm is 8 ohms, which will actually decrease the output from your amp. If you put to 4ohm speakers in parallel which is ++ and -- they will add using this goofy formula-
R1 x R2 / R1 + R2 or 4x4=16/4+4=8 =2 ohms which might damage your amp...
10 years, 11 months ago
by
psmportland
Portland Oregon