Update Mar. 3: I am updating the overall rating to 4 out of 5 stars for the following reasons:1. Warranty Policy - 3/5 stars - While the service techs/customer support were quick to diagnose the issue, the warranty policy had them ship me the woofer kit/component of the subwoofer only and I had to replace the woofer in the sub myself. While not difficult to do, this is not what I had expected from a subwoofer at this price level.2. Customer Support - 4/5 stars - While there were some delays, the folks I worked with were very knowledgeable, and despite some staff shortages on their end, were able to process my warranty claim relatively quickly and with minimal challenges.3. Product Quality - 5/5 - Once I got the sub working, even at -7dB on my a/v receiver and the gain at about 60%, the sub sounds smooth and the bass response is fantastic. Looking forward to fiddling with the gain and settings a bit more to get to the right balance of bass tone/tune and rumble.Update Feb. 26: Based on a push test, this sub has a damaged woofer, so it was actually DOA. Klipsch support worked with me last week to get a replacement sub ordered. I have updated this review rating to 3 based on that interaction, and will update it again once I receive the replacement and can test it out.Original Review: I had super high hopes for this high end sub. However, since day 1, something hasn't sounded right. The sub rumbles when there is no to little music/sound and it's a very rough almost sputtering sound. I thought it was port chuffing, but I don't think that's the case anymore. The only way to avoid the sound is to turn the sub gain lower than the midpoint. I was able to drive a less premium Klipsch sub harder in the same setup. Currently trying to work with Klipsch product support, but they have not been super responsive.