Two recommendations are to turn off your computer and refrigerator for serious listening. They are both free, and will make a huge difference. If you still have room problems, experiment seriously with speaker placement, or replacement. To buy an electronic device to cure your system's shortcomings is just plain wasting money. You don't mention what you have for equipment, but I suspect you're trying to make the Silk Purse out of the proverbial sow's ear. Just my opinion of course, but I'd rather buy music than another pice of equipment to get in the way of the original signal. But I'm just an old-school guy who enjoys his system without tone controls of any kind.
Best of luck in your search for more enjoyment from your Hi-fi.
Best of luck in your search for more enjoyment from your Hi-fi.