After extensive testing last night with Avia and True RTA 5.1, I think I have nailed the problem with MY 990. I am not saying this is a production wide problem, just that this is the response of MY unit. If Outlaw tech support would just be a little more open minded and a little less evasive on the problem....they might learn something by reading this.

First of all I have bass management issues on analog two channel inputs with speakers set to small. Tech support actually is advising against large setting with L/R+sub. I think the problems with the L/R +Sub setting are the same as the problems encountered with the small speaker setting.....full output subwoofer signal.

From my testing with Avia and True RTA5.1, when changing crossover points THERE IS NO MEASURABLE DIFFERENCE IN SUB RESPONSE with speakers set to small on two channel analog inputs using modes of Stereo, Bypass & Upsample. Only the L/R response changes. The freq. reproduction of the sub is limited ONLY by the response of the driver in your sub. It is a full range signal no matter what (mine dropped off at around 1khz). This is a fact in my unit and contradicts what I was told yesterday; namely that bass management is applied in Stereo and Upsample but not in Bypass. Outlaw said in bypass with speakers small, a copy of the L/R is sent full range to the sub. Bass management (with proper crossovers)are applied in Stereo and Bypass. This is definately not happening. True, there is some management being applied (as I will go into below) but it has ZERO effect on the Sub signal in ANY MODE.

There is some management of the L/R speakers. When set to small, the crossover for the L/R is actually reversed from what is presented on the screen. 40hz is 200hz, 200hz is 40hz. I confirmed this with the RTA. Regardless of the setting, the sub is playing (in my case) up to 1khz. If the same is true in large speaker setting, there is your muddy double bass problem. Full range to the fronts and FULL RANGE to the sub. I encountered this problem with the large setting and L/R+Sub.

There are a couple of questions being begged here. If, as Outlaw states, the 990 bass management is "working as it was designed", one must question the intention of the designer. I cannot envision a scenario where multiple global crossovers are used for multiple speakers that a full range signal to the sub would be beneficial.
Secondly, if the bass management for analog sources in "Bypass" mode simply copies a full range signal of the left and right speakers and sends it to the sub (as was told to me by Outlaw yeaterday), what is happening on the sub signal in 7.1 "bypass"? I bet it is a full range copy just like 2.1 channel "bypass" (too tired to confirm this).
Lastly, Steve at Outlaw told me "all home theater processors digitize the analog inputs". While this may well be true (I have no idea if every single one does), one must question the accuracy of statments like "Pure analog mode" and "pure bypass" listed on the product information sheet.
Pure analog from a redbook cd does not reproduce a .1 channel to my knowledge, let alone a full range copy of the L/R it.
My unit will be going back to Outlaw for a couple of reasons.

1. It does not work the way it should regardless of what Outlaw says. There is no effective way to integrate a subwoofer and listen to CD material on an analog connection. I would rather return the Outlaw than throw away my subwoofer.
2. I can't take the chance of waiting until after my trial period is up to see if it will be fixed.
3. They won't extend my trial period.