Hello.
What would you be trying to achieve by getting a second sub? Your REL probably has enough output for your room size, for music. I used a Storm III in a 30x18x9 for music and it was ok. But I grew interested in acoustics and got myself a measuring mic and card, and realized how much the room was effecting the response. I now have two 12" Rythmik subs, each set up differently, and placed asymetrically, and it sounds so much better than with the single REL. My goal was to smooth the room response, and I did.
But bottom line, depends on what you are trying to solve. 1 sub is better than none, 2 is better, 3 would be even better. Note that when using multiple subs, each sub doesn't need to be as powerful/expensive as when you are using a single sub.
I hope this helps.
What would you be trying to achieve by getting a second sub? Your REL probably has enough output for your room size, for music. I used a Storm III in a 30x18x9 for music and it was ok. But I grew interested in acoustics and got myself a measuring mic and card, and realized how much the room was effecting the response. I now have two 12" Rythmik subs, each set up differently, and placed asymetrically, and it sounds so much better than with the single REL. My goal was to smooth the room response, and I did.
But bottom line, depends on what you are trying to solve. 1 sub is better than none, 2 is better, 3 would be even better. Note that when using multiple subs, each sub doesn't need to be as powerful/expensive as when you are using a single sub.
I hope this helps.