Klipsch R-100SW 10" Subwoofer

First, I compared the new 150 watts (max 300 watts) sub Klipsch R-100 SW model to my excellent working condition 30 years old (22x14x18 inches) Kenwood 150 watts sub. I used a Sony AVR 4K model to hook it up. Second, I listened carefully how the sound is produced by Klipsch R-100 SW in the past 6 days to avoid buyer’s remorse. Both subs’ configurations have not changed drastically. Except electrical connection, there are 5 controls in Klipsch namely: 1. Gain (called volume in Kenwood); 2. Low Pass (called Crossover Frequency in K); 3. Auto “On” option (same as in K); 4. Phase - means 0 or 180 degrees physical placement of sub if you use 2 subs watching TV or hearing music = who does that to the entry level sub? (not applicable to Kenwood); and 5.) Line for RCA stereo cable (same as in Kenwood). Other than the subtle differences of Volume Knob placement in Kenwood’s front, LED display, and weight…the critical differences are in Crossover. At factory suggested Klipsch R-100 crossover setting of 80 hz and the volume was at the middle, the walls and floors vibrated. How much more to its 120 hz max crossover frequency? Kenwood has 200 hz max crossover. Kenwood has another knob called Crossover Slope that can be switched to 24 dB or 12dB which is absent in Klipsch R-100. It is a crucial difference in the reproduction of sound. My set-up in Kenwood crossover frequency is at 125 hz and at 12 dB crossover slope which is pleasing to all listeners for all the years. At Klipsch setting of 80 hz crossover, I was SHOCK how horrendous the sound reproduction of a song “Come Together” by Beatles. I refused to believe and I repeated playing the song again with the same bad results. The sound was, “as if a 3 storey building was swaying wildly due to hurricane”. With that encounter, I set Klipsch RS-100 to 40 Hz, its lowest frequency level to avoid the repeat of bad sounds. It seems Klipsch R-100 SW tried to compensate the absence of Crossover Slope by having a lowest 40 hz crossover frequency but still not enough. At 40 hz frequency setting, playing “Come Together”, the bad sound reproduction is still audible but manageable. The streamed music/concerts and TV surround sounds sounded normal. Still at 40 hz lowest frequency crossover level, it has a tendency to be “boomy”. In contrast, Kenwood’s lowest crossover frequency is 60 hz only. I will keep Klipsch R-100 SW costing $280 at time of writing coz my next choice is Polk HTS 10 for $399. One star deduction for the absence of Owners’ Operating manual and inconsistent fidelity sound reproduction. One star deduction for absence of specialized RCA cable. I initially thought it was defective and wanted to return it coz it did NOT produce any sound when I used ordinary RCA cable.