Anyone heard these or the other 6"  ceiling speakers by JA Audio?

I need something for the rear in a 7.1 but they may get a bit of music when the Amp put into "All Stereo" mode.
Also considering B&W CCM 616 but they might be a bit light.

Others to consider??

They have to be ceiling mount due to room layout.


This from Web:
 JA Audio NZ is the NZ distributor for JA Audio Home Theatre Acoustics, Silicon Valley, USA. Our mission is to provide the highest quality audio products at the most affordable prices.
The JA-G6 is designed with the latest technology Syncoaxial driver which lets the woofer and titanium tweeter work together precisely. The high-end crossover is adjustable for tweeter 3dB. This speaker is also magnetically shielded to prevent LCD/Plasma interference.
A white grill is included to cover the front of the speaker.

2-way Aluminum High Performance In-Ceiling Speaker
Tweeter: 19mm Titanium dome tweeter
Woofer: 6.5" Aluminum cone with a rubber surround
Crossover: Hi-End 18 dB, adjustable for tweeter 3dB
Frequency Response: 55 Hz - 20,000Hz (+/- 3dB)
Impedance: 4-8 Ohm switchable
Power Handling: 20~100 Watts
Efficiency: 88dB
Grill: White aluminum grille
Dimensions (Diameter x Depth):228mm x 68mm
Cutout: 194mm diameter, template provided