You are correct, the extra power between the two will not be noticeable. Adding the Outlaw 5000 will not make a noticeable difference either because as you know, you need 2 times the power to gain 3 dB of sound pressure and it is generally believed that you need 8-10 dB more spl to perceive twice as loud. Adding an Outlaw 5000 will mainly help if you have 4 ohm speakers.
If you hear distortions at -7, it is likely your source flac file. Try some high resolution files, not that 192/24 is necessary or better, but there is better chance they were made from better quality recordings.
Also, make sure you don't have Eco mode turned on. Add a couple of ACInfinity fans to help cool the unit instead. Eco mode limits the rail voltage and that will definitely limit power output if you had the volume as high as -7.
This is exactly what I wanted to know! I had wondered about Eco mode and others were saying to leave it on as it increases power as you need it and should extend the life of the amp? Sounds to me like I need to invest in an Emotiva XPA-5 Gen 3 to make a difference since it is 250w / 5ch, right?
I'm starting to wonder if it was distortion I heard at all or some kind of interference possibly. A few things to note. My left speaker which has a "sub" is only 6" roughly away from a couch/chair and one of my subs is only 1" to the right of it but the sub is forward facing.
Could this be a power issue?
The following items are all on the same breaker.
I have an APC H10 that powers both HSU VTF-15H's, Receiver, Xbox 1, Harmony Remote, 65" Samsung, Both Deftech 8060 Towers, and the 8080 center channel.
Likely on the same breaker but NOT on the APC unit is my HTPC that consists of 6 HDD's, over clocked 1080ti, 6700k, 12 fans, & many accessories.
I have never blown the breaker, but I have managed to over load/trip the APC unit 1 time when the subs hit at the end of the silent scene in Star Wars The Last Jedi.