Why not put a jack in the headphone socket of your S900 if you want to hear the FBT's without the colorization from the built-ins?
Mind you, I never have been a fan of JBL's low end stuff. Those MR series are the worst junk I think they have ever put out, and I'm not so fond of the Eon's either. But trust me, JBL's reputation was built on the high end of their line, and no doubt about it, the SRX line is worth every penny! The most reliable, great sounding speakers I have ever used...
We've had a pair of the smallest ones (of the older SR line) in a marine environment on the beach in Florida at full concert level (or close to it!), just a 12" and a small horn/bullet with 400 watts + going into them for nearly TEN YEARS without a single driver issue and impeccable sound. Crystal clear, warm and robust. A pair of 18" subs under them (Yamaha's, Ian
)
You get what you pay for... (Those FBT's aren't cheap, either..!)