Resolution Audio's Hi-Fi Sounds Decidedly Good

XS/Extra Sources: The XS box is a lot more than a few extra inputs. XS adds a moving coil phono preamp, a moving magnet phono preamp, a FM/AM tuner with RDS, five digital inputs, including USB for PC/Mac, two analog inputs, fixed and variable analog outputs, a headphone amplifier, the Opus 21 system bus for direct connection to the Opus 21 CD player and s30 amplifier. It also houses the system remote control.

Put all these together and you have a very sophisticated hi-fi system that takes up very little space.

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The Resolution Audio Opus 21 system comes with very few wires. That's because the components plug directly into each other. There is a proprietary system bus on the top and/or bottom of each enclosure that connects everything together when you stack the boxes. The power supply box does have one AC cord and one connector cord (to the CD player).

The flexibility of the Opus 21 system is amazing. I was able to plug in every kind of component I could find (analog or digital) -- and still have room for more.

Opus 21 can also be a mix-and-match affair. You can buy only the CD/PS-Power Supply combo and attach to your current system. Or, the CD, PS and S30 amp and just add speakers. Or the CD, PS and XS/Extra Source box and use your own amplifier and speakers. Or go for the "Full Monty" -- CD/PS/S30/XS -- and sit back and enjoy.