Polk Audio RTi6 RTi8 RTi10 Tweeter Speaker # RD0690-1 / RD0690-3 Pre-Owned Polk Audio RTi6 RTi8 RTi10 Tweeter Speaker # RD0690-1 / RD0690-3. This sale is for 1 (one) tweeter speaker removed from a working bookshelf speaker. The tweeter speaker comes tested and working as shown in the photos and video. The cone of the tweeter has a dent in it as shown. Please view all the photos and the video to judge the condition for yourself. This was taken from a working Polk Audio RTi6 bookshelf speaker. Other speakers and parts can be found in our store so be sure to check them out. Ships insured. For more great items please see our store at: - https://www.ebay.com/str/JAG-VENDING