it can also measure the audio spectrum output from the head directly. I say likely better because it wasn't in yet and we couldn't measure it and that is what I was told. We unplugged the rca's from the amp and plugged them into the rta (a newer digital one, not the suitcase audiocontrols I have seen) and then measured it's output with pink noise, and the denon had a noticeably more solid bottom end than the Pioneer, and you could phisically see BBE's effect on the signal (looked like a happy-face), though I think BBE does some phasing things too. I'm not trying to piss you off Adam and say the 860 sucks, I don't think it does, I am just not sure if the Eclipse is better- though having to give up my xm radio is likely the deal breaker if there is no obvious difference in sound