so you would consider the pb-2000 not a "higher" model sub?
"Higher" is a relative term. It is higher than the PB-1000 (which is a great subwoofer for its price), but it is lower compared with the
PC12-Plus and the
PC13-Ultra. At its price point, the PB-2000 is a very good subwoofer.
The point was, with the differences in electronics, you are unlikely to hear much, if any, difference (if one bypasses all special processing), whereas a better subwoofer is much more likely to make a real difference in the performance you get. Most people, in my opinion, spend far too much on electronics, and far too little on speakers (which includes subwoofers), if actual sound quality is the goal. Speakers, including subwoofers, make vastly more difference in the sound you get than electronics generally do. For the electronics to be a big deal, either one is comparing with garbage, or one has speakers that require massive power. Otherwise, the electronics will have
relatively minimal effect on the sound. The new automatic setups can be different from each other and make a noticeable difference, but they cannot make up for substandard speakers or magically get more output from one's subwoofers. Also, the better the speakers you buy, the less likely you will feel the need to ever upgrade, and that can save money in the long run. In the case of receivers and processors, they are always coming out with new features that may entice you to replace whatever you buy now, which means that receivers and processors are not good long-term investments, whereas speakers never have to be replaced as long as they continue to work and one is satisfied with them.