GRS is quite literally shorthand for "Great Replacement Speakers." For many years, we've taken pride in offering excellent replacement woofers, subwoofers, speakers for car audio, midrange and midbass, full range speakers, tweeters, and even ceiling speakers. In fact, our drivers are not only great for repairing or upgrading vintage hi-fi speakers, many enthusiasts use them in new speaker building projects as well. Outstanding performance, astonishing value. That's GRS.