I guess the old adage applies here; - - - "you get what you pay for".
There is simply so much information and tech available on the REL website, I'll admit that I'm somewhat shocked that you didn't research before buying. That virtually applies to any and all audio gear. ESPECIALLY a product that you have no reasonable way of auditioning or at least talk to a knowledgeable sales tech, who could easily walk you through the pros and cons before you buy. REL offers so much more than just adding another low frequency octave. REL is arguably, the "best of the breed".