Tony....I did a bit of research on the Crown Xti amps, and the findings are interesting.
It performs A/D conversion at the input, and then rather extensive digital signal processing (DSP). Included is a crossover, a four band equalizer, subharmonic synthsizer, delay, limiter, and gain(digital). After that it does a conversion back to analog which drives a conventional linear power amp. The power supply is a switching type, which some audiophiles don't like. (It has obvious advantages for touring bands, as it will work with a wide range of AC input voltages). As best I can tell there is no provision to bypass the DSP and run the power amp directly. I have never heard this Crown amp, and its sound may be excellent.
The CarverPro ZR1600, which I endorse (and own), takes the opposite approach. It also has various less extensive signal processing features, but implemented by analog circuitry. The processed analog signal drives a digital power amplifier. All the signal processing can be bypassed. The power supply is a conventional design. I have heard the ZR1600, and IMHO its sound is excellent.
Two amps, with similar apearance and aimed at the same customers, but quite different in design concept.
Enjoy playing with the DSP, and tell us what you think.