Bi-amping ADS L-1590 or L-1290

Abruceaudino, I have a pair of 1590's and had them biamped using an inexpensive rane crossover set at 350 hz.
Behind the low frequency connectors, move the switch to the left, for biamp operation. For what it's worth, I have a pair of pa1 amps. They do sound real good, but they are 25 year old technology and small. The speakers sound better with better amplification.

If you go without the crossover, the biamp switch gives you direct woofer input, but the midrange and tweeter are still protected by the crossover.
I had tried mine biwired, and the woofer does play some of the highs,sounding a little bright for me.
Mine are not being used at the moment either, but I have had them since '85, and when i hook them up they still sound great.( Still have the owners manual. for crossover info etc.)