The SDA brochure says...
For even greater dynamic range and lower distortion, the SRS loudspeakers may be connected for Bi-Amplification using the two sets of inputs provided on each loudspeaker. No electronic crossover is necessary. By permitting different amplifiers to reproduce the high and low frequencies separately, the SRS loudspeakers achieve their greatest sonic potential.
So, how do you get high frequencies to go to one amp and low to go to another when you only have 2 full frequency preouts? Do you need a preamp that supports this, or another piece of equipment that does the seperation?
Reason I am curious is that it seems like dual bridged amps are a headache and you need a special SDA cable to do it.