Check the listing for details. MTX Thunder 5.25" With Fast Ring. Condition: New. Listed at 116.96 USD. This bundle features an MTX Audio THUNDER52 Thunder Series 5.25" 2-Way Coaxial Speaker Pair and a RKFR5 Roadkill Fast Rings 5" & 5.25" kit. The THUNDER52 speakers offer clear response with a built-in tweeter and rich bass from the polypropylene cone, handling up to 45 watts RMS power. These speakers excel in lower frequencies, playing down to 55Hz for impressive bass response without needing a subwoofer. The polypropylene woofer and pivoting tweeter enhance audio imaging, while features like extended low-frequency reproduction and concave cone design deliver a full sound and improved off-axis response. With a 15° pivoting tweeter and Spider Plateau Venting for reliability, the THUNDER52 speakers ensure a top-notch audio experience. The RKFR5 Fast Rings kit optimizes speaker performance by.