You should absolutely consider spikes, or better yet, outriggers. (oregondv.com) This should really help you achieve what you are looking for.
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Getting your speakers situated and leveled with spikes is essential. You can't hear whatever bass your speakers are capable of without them. Getting the speaker positions balanced between optimum soundstage and just-right room boundary bass reinforcement is essential. A high current amplifier certainly helps, as does turning the amp on for awhile to charge up the capacitors fully before playing music. For better bass also consider Transparent or MIT cable, though there are several that do bass well.
I'm anti spike having spiked for many years. I use Vibrapods under my floorstanding speakers (Silverline Preludes), although not my sub (REL Q150e)...it sits on felt pads just to keep it from scratching my floor. I might be nearly alone in this, but it all sounds great in my room with my impeccable taste , amazing ears, and humble demeanor.
Matching speaker bass output to room size and positioning of the speakers within the room boundaries should be your first priorities. Once optimized you can move to room treatments if warranted. Changing cables should be at the bottom of your "to do" list since (IMHO) 90% of the bass quantity and quality will be determined by the other factors.
The benefits of proper positioning and bass traps FAR outweigh any possible benefits of spikes (or cables??). And how can anyone recommend spikes when the OP hasn't even mentioned the floor the speakers are sitting on.
I went to a friends to listen to his system for the 1st time a while ago, and even though his speakers were the model smaller than mine the bass blew me away. I got what he had - GIK corners and 244 walls. Realtraps is another brand, and there are several others.
07-24-12: PhasecorrectTake your original tower speaker boxes, stuff them with wadded up newspaper, and stick them in the corners. That's the most affordable version I know of. I first read that recommendation in a magazine interview with the guys who founded and run Shakti. It's what I use in my HT 7.2 rig with dual-ported Mirage M5si's. Cleaned up the bass quite noticeably.