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.

I have a spare pair of 1290s. I have bi-wired and bi-amped them without an external crossover. I used the internal bi-amp switch and I thought they sounded great. Maybe they could sound better with an external crossover but I never felt the need to try one. Even though I have the 1290s as a spare set, I will probably never get rid of these speakers. I would maybe trade them in for a nice pair of 1590s.

I may try bi-amping w/out the crossover just for the heck of it until I can pick up an external one. However, dont you risk damaging the speakers or at least ruining the sound by sending the full frequency to all the speakers? From what I gather, selecting the bi-amp switch in the back disables the internal crossover, which is why you need an external one to properly bi-amp them.

ADS actually made an electronic crossover for the 1230/1530/2030, called the C2000 Biamp Control. As per an ADS bulletin, it can also be modified quite easily to work with the 1290/1590. I have owned several of them over the years, as I own a pair of 1530's and 1590's. The main difference I noticed in biamping was additional bass output, and not much else. I now use Velodyne 1500R subs with each pair, and find this preferable to the added expense of an extra amp and cabling. Occasionally a C2000 will appear here on the 'Gon and on Ebay. If you should consider this, and want to know how to make the mods to work with your speaker, I have the info on how to do it.

There is also an electronic crossover that Bryston makes that could also work quite well. It has adjustable crossover points and should match up well.

A real must-do, tho, is to make sure you use identical amps-it will make balancing everything a much easier task. I also tried a pair of PA-1's, and wasn't impressed at all with them. The bass wasn't that great, and power seemed to be limited if you like to play them loud.

And last of all, good luck! You have a great speaker!!!