Budget Strategies forTightening up Bass?

Forget about wires, cables, footer, sorbothane, and all the other tweaks. The most important thing in a system is the room and speaker placement. Not that I'm a guru or close minded, but anyone who thinks a new power cord or speaker cables will solve an issue like bass response batter than speaker placement is an idiot.

The cables and tweaks can and do work, but not to that extent. They're worthless if everything isn't set up correctly IMO.

I know... I'm going to catch a lot of flack for that one.

If Stuartk can not move the speakers there is no reason to recommend that he do so...

"The most important thing in a system is the room and speaker placement."

Also match between amp and speakers.

The rest may help but cannot substitute for getting these two things both right first.

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I don't post here much because of the large variety of opinions, all of which cannot be right. But this one is so obvious to anyone who has successfully voiced large numbers of systems.

The single most important thing does have everything to with the room. It's locating the best place for the listening seat.

The "best place" is where the bass is smoothest, so that you are not unduly at the mercy of room resonances. All else (such as moving the speakers, changing amps, etc) is of lesser significance. Not that they aren't important, but working with the standing waves in the room - rather than against them - is foundational to the OP's quest.
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I'm not familiar with the Silverline 17.5. If it uses a ported box, you might try lowering the tuning frequency by lengthening the port and/or reducing its cross-sectional area. Or tightly stuff open-cell foam into it, transforming the system into a pressure-relief type of cabinet. Or seal the port entirely.

Duke
dealer/manufacturer