Hi Edward:
The XMP100 and the new OMSUB200S Outdoor Subwoofer are a good match. The 4-ohm woofer will demand higher output from the XMP100 versus an 8-ohm woofer. The XMP100 also features Auto turn on as well. It's worth trying with our 30-day evaluation. If it does not have enough output, then you will want to exchange for one of our larger subwoofer Power amps have bigger Subwoofer amplifiers
TL/5224