Not sure about 2.1, but here's a 2.0 system with a digital input.
Behringer MS40
I'm planning to buy them myself.
SPECIFICATIONS
Loudspeakers
Tweeter Ø 65 mm (
2 1/2"), 8 O
Woofer Ø 120 mm (
4 3/4"), 4 O
Audio inputs
Line 1 1/8" TRS stereo, impedance 20 kO
Line 2 2 RCA, impedance 20 kO
Digital inputs
Optical TOSLINK
Coaxial RCA
Converter 24-bit
Sample rate < 192 kHz
System specifications
Output power 2 x 20 W
Frequency response 50 Hz to 25 kHz
Power supply
Mains voltages
USA/Canada 120 V~, 60 Hz
Europe/U.K./Australia 230 V~, 50 Hz
China 220 V~, 50 Hz
Japan 100 V~, 50 - 60 Hz
General export model
120/230 V~, 50 - 60 Hz
Power consumption 90 W
Physical
Dimensions (H x W x D)
11" x 6 4/5" x 9 5/8"
279 mm x 173 mm x 245 mm
Weight
right: 10.78 lbs. (4.9 kg)
left: 7.04 lbs. (3.2 kg)