The SB3 is good enough for me as a convenient complement to my G98, but Transporter is a higher end solution.

http://forums.slimdevices.com/forumdisplay.php?f=7

HD621, G98DH, G68ADV, Bc Acoustiqe ACT A3, 5200C DSP33, NuForce Reference 9 monoblocks, 2x SB3's, Velodyne DD-15 & DD-12 Subwoofers and a Meridian sub.