Or if you want something fancy have someone cut out a large block of hardwood at an angle.
Hey, you can even do carvings and finish it up nicely with some stains.

This post has been edited by VagueConcerns: Nov 7 2015, 09:36 AM

I don't know anyone at your area.
For a solid block of hardwood, and for that purpose, you wouldn't have to worry about any resonance. You would isolate it from the block of wood as you normally would when placing it directly on a desk or floor. You would treat it as a new floor.

Even if you don't isolate it and place it directly, I wouldn't worry about having a 2 inch thick piece of hardwood resonating, especially since it's not only much smaller than the cabinet, it is also not in direct attachment to the speaker driver. If anything, the cabinet vibrations themselves are the main problem if it's violent enough to vibrate the block, not the block itself.

I don't think the soundcard has an amplifier fit for speakers, nor do the speakers have their own amplifiers judging from the ones I saw. They're just ordinary +/- wiring for amplified signals, not for line-level connectors. The subwoofer's plate amplifier is the one that's powering the satellites, as per usual. If you have a separate amplifier that you can feed with the sound card, then yes you can power the satellites independently from the subwoofer.