Hello gfed - the 250A modules are not powered, while the 250ASP are powered. The 250ASP can power up to two 250A modules for 3 channels.
I like these a lot on my Apogees. All other speakers are also good, but for some reason, the Apogees and ICEpower are perfect together...
Thanks for all the help on my DIY ESL Transformers, and giving me the courage to fix the buzz on my Apogees!!