The low pass cut-off frequency thing is new to me... Sometimes I see my sub has tuended itself off after three minutes of no (or too low of a) signal. Wow, interesting... it's not because of the master volume, it's because there is no sound information below 40 Hz. This just occured to me; last night I saw the sub off and cranked the master volume to some rediculous number like -1 db and the sub stayed off. Back to -25 db and later the sub came on by itself when the "spaceship" rumble occured.
Truly low bass is actually rare, especially in music. That's why we all got along for so many years without dedicated subwoofers in our home audio systems. You need pipe organs or movie sound effects to get below 40Hz in most cases. As a result, it's inevitable that the "auto" power modes on subwoofers are frequently subject to "falling asleep." There are ways around this, actually. In my case, I switch all of my power amps (Model 7500, two Model 200's, and the LFM-1 amp) through switched high-current outlets on my power conditioner. A 12V signal from my processor turns them all on whenever it is on, then turns them all off when it is off.
I don't know what you traded your 990 for, Gonk, but it must be sweet. I'm still trippin' every time I hear my new stereo... the only thing different is the 990. How can it sound like I have more powerful amps and speakers is a mystery to me. All I can say is don't skimp on a preamp, it can make a huge difference!
I moved from the Model 990 to an Onkyo PR-SC885 a couple years back because I needed HDMI support for Blu-ray player testing (OPPO Digital). Frankly, my wife liked the Model 990 more, both sonically and functionally.
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