This is part-question, and part story- Over the weekend, I added an SVS 25-31PC Plus to my stereo system- Adcom amp, Adcom preamp, and PSB Stratus Gold speakers. I am currently running the Golds full-range, and setting the SVS crossover at 40Hz(it's lowest point). Gain on the SVS is set at about 8 o'clock(very low). No port blocks are in place, with the sub tune at 25Hz. Using a sound meter and a test disc, I got response at 20Hz, down by about 6 db compared to 25Hz. I currently have the subsonic filter set to 16Hz. This arrangement is an unqualified success. There is not even a hint of chestiness in vocals, I guess due to the low crossover point. Even though the Golds go down to 36Hz, the extra weight added by the sub is phenomenal. I am loving the sound. At the low crossover point, you cannot come close to localizing the sub. But I am curious about one thing- does anyone feel that adding a port block to lower the tune to 20Hz would make much of a difference? This is a music-only, 2 channel system, and is often played fairly loud. Does the lower tune substantially degrade the power handling capabilities of the sub? Room size is about 16x20 feet with 10 foot ceilings. BTW, the reason I run the Golds full range is that I have never come close to feeling that they were at their limits in the 8 years I've had them. Any thoughts appreciated. Thanks.