Not possible as there are no audio output connections on the soundbar. What you can do is connect the signal input to the amplifier then connect the output of the amp to the input of the soundbar.
The lack of volume given to the central channel, that is distributed to the L and R, is a little frustrating, if the volume is down you realy can´t listen clearly, that´s strange, cause the other channels appear to be most clear, better...maybe its the bru-ray player, or the tv optical conection, a simple equalization can solve that. If the volume is up, it´s perfect. Sounds like a Jbl Es30, and its not bad :) . SOORRY FOR THE BIG POST! :)
The major frustration (a surprise realy, cause the remote control does part of it´s job) , is that a great sound system like this doesn´t have a front panel! So you can´t see the source, the volume etc...
I liked the kick of it, its very diferent from a SONY HT I have, the JBL one have a clean kick from a drum bass or a "explosion".. It does not have a "crescendo" or a "mix it up" that turns into a just heavy noise, if you know what I mean, that the common and more popular ones, like my Sony, have.. The wireless subwoofer also has a button that cut from 40Hz to 200Hz, at you choice, a Phase control and a pairing button..and a volume button, and its active..
shame that doesn´t have a hdmi port, for HD MASTER sounds u must use the Optical port. The 3D surround processing is... cool... not like a real 5.1 at all, as expected, but realy creates a resonance from the lateral that makes you feel the sound coming by your side or back, its interesting.. the subwoofer is a pro, besides the strange "dirtorced" aspect, have a real clearness listening over the Hz spectrum... You can listen the Bass from a drum a little heavyer that the bass, for example...
Amazing the aspect quality/size.. I am a musician and it´s absolutely true that JBL has the best internal components overall.. the speakers sounds like a 4" or 6" speaker, I turned on and find the volume, the bass/mid/high balance excelent, and, the best for me, the sound don´t loose the gain, the quality itself when turning the volume up, and I mean UP, is great, no distortion at all...