Hi Caesar, like you told me a couple of years ago, the treble of the Krell's leave something to be desired. The biggest difference with MBL 9011 amplification was surprisingly in the bass. With MBL the the mid bass speed and articulation improved drastically, Sound staging also improved. Initially after getting MBL amplification i left my Statement subwoofers disconnected,enjoying the newfound fidelity, and finding the integration of the subs difficult.
After a couple of month the old itch returned, and I tried again. The best integration was achieved with the 101's running without active crossover, but with the internal 12 inch driver disconnected, the passive crossover in the 101's is still great for integration with the "smooth" settings perfect in my setup. The subwoofer towers are actively crost over at 100hz 24 dB with a very specific delay time/ fase setting, it took a long time to get right !
The improvements are better bass integration, compared to the original two 12 inch drivers. 16 12 inch drivers go deeper and faster when driven correctly , and they load the room better than the original down firing subs.
The imaging and sound staging also improved drastically, if it is because the main amplification has a lighter load with separate amplification on the sub's, or because of less movement In the main speakers is unclear.
There is a lot of room information in those deepest bass tones, that you don't hear with a regular setup.
Thank you - I am starting to remember the conversation... I am surprised, though, that you have held on to the Krells...
As for woofers and subs, what you are saying makes a lot of sense. Because the MBL 101 is so inefficient, you really need to throw a lot of current / "power" at it, like I do, with 4 heavy duty amps to get them to perform at full potential. But I really commend your creativity and patience for disconnecting the woofers. It's awesome that you were able to successfully integrate those bass towers!!!!! Wow, just Wow!!!!!