I'm done testing.
First I popped in Dream Theater - Black Clouds & Silver Linings (original CD of course) and listened to the track called "The Best of Times". I did this with my normal setup (bi-amping) and it sounded great of course.
Next I spent a good 10 minutes trying to get all the speaker wires bi-wired on the back of the AVR, this was quite tricky
. Turned on the AVR, switched to normal amp distribution (no bi-amping), played the same song and it sounded so flat when the acoustic guitar kicked in
There is a world of difference, at least with my setup.
I reversed the setup and I'm back to bi-amping and straight away when the acoustic guitar kicks in it runs shivers down my spine as that track always does, it sounds so warm and detailed.
I'm surprised as I expected to hear very much the same audio quality without bi-amping. Especially considering the threads I stumbled upon last night where passive bi-amping is called nothing more than placebo.
In all three tests I had the volume at -30db, used the STRAIGHT setting on the AVR and had the bi-amp setting adjusted accordingly of course.
The speaker-wire I'm using is this kind with tinned silver threads for the tweeters:
Perhaps that makes a small difference somehow? I got the wires marked "Low pass" hooked up to the Front L/R terminals and to the tweeters of the speakers. Likewise I have the "High pass" wires connected to the Extra speaker terminals and to the woofers of the speakers.
So I guess there's no getting around having 5 of the 7 amps driving 4ohm speakers, as passive bi-amping clearly works for me, and I already paid for the JBL L Center
Hopefully there won't be a problem, but I'll keep an eye on the heat generated by the AVR, just in case.