Amazon.com: Polk Signature Elite ES30 Center Channel Speaker - Hi-Res Audio Certified and Dolby Atmos & DTS:X Compatible, 1" Tweeter & Two 5.25" Woofers, Dual Power Port for Effortless Bass, Elegant White-Washed :
JBL ES30 Bookshelf Speakers user reviews : 4.6 out of 5 - 2 reviews - audioreview.com
JBL 362728-001 6.5" Woofer for ES30 and Studio 180 Series 2 - Speaker Exchange
JBL ES30 Bookshelf Speakers; Excellent Pair. - The Music Room
Amazon.com: Polk Signature Elite ES30 Center Channel Speaker - Hi-Res Audio Certified and Dolby Atmos & DTS:X Compatible, 1" Tweeter & Two 5.25" Woofers, Dual Power Port for Effortless Bass, Elegant White-Washed :