Noslepums, just curious if you measured actual impedance, or resistance. If just resistance, you can have dips below that. Also you might get away with using non-inductive resistors in series with drivers, if they have enough power handling for your needs. You will lose some volume, but may not be much, depending on the value of the resistor. Some will say this may not sound good, but Harman Kardon used these on a Citation amp, I believe. Speaker companies do it also, for various reasons. Others do this, and it is quite common for A/V receivers to do this also.
