New Fuse Makes Stereos Sound Fantastic

This magic doesn't come cheap, though.

These fuses cost $30 each (for the shorter version) and $40 for longer ones. They're available in a slew of amperages -- in both regular and slow-blow versions.

I know that sounds expensive -- but not when you hear the difference they can make.

Know What You Own: RadioShack operates in the electronic services retail industry, and some of the other stocks that it competes with include Best Buy (BBY Quote), Circuit City (CC Quote)CC and even Wal-Mart (WMT Quote). These stocks were recently trading at $41.21, $3.84 and $49.89, respectively. For more on the value of knowing what you own, visit TheStreet.com's Investing A-to-Z section.