You should check out MJ Acoustics Subwoofers. They are very similar to REL, the company was founded by former REL employees, and work very well with full range speakers. They retail around 35% less than the comprable REL Subwoofer and are even less expensive in the US where they do not sell as well as they do in the UK. I have owned them all and my MJ Acoustics Reference I MK III is very very good. It is as musical as my former REL Stadium III for half the price.
