Without knowledge and use of extensive measuring equipment, how can one determine if the vertical plane problem is due to the room or the equipment? Every audiophile I know (OK, that's like 3 people) has the same issue. The horizontal soundstage and imaging are "easy" to dial in, but I've never been able to expand the sound along the vertical axis......
Measurements in your room aren't going to help you with this. If your speakers meet the criteria to create this soundstage (mentioned earlier), and Danny says this model will, that work has been done for you. Now, it's about room, position in the room, and equipment. If you have speakers that don't meet the criteria, they'll still sound great but never give you the realistic image no matter what you do. I have a pair of coaxial horn speakers that will never create a realistic image, but have a great center image, and sound wonderful.
Here's a link to a great resource. These imaging tests are the first I've tried that have the vertical (from speaker to ceiling) and the left/right pan BEHIND the speakers, rather than a simple left/right pan. There are many other interesting resources on this site as well. It does require a small donation however to download the files. https://www.audiocheck.net/audiotests_ledr.php
I worked quite a while with a pair of speakers capable of properly reproducing these tracks but didn't, until I made the appropriate position, and equipment changes for them to do it. Now, an orchestra is behind the speakers, with height to the ceiling, and the speakers are invisible. No sense of were the music is coming from. This type of imaging, and image specificity isn't important to everyone, of course, but once I heard some systems that did it, I wanted it in my system.
Mike, we might have to upgrade your front end gear.
And you shouldn't have anything using a wall wart.
I can change the vertical imaging and layering with DAC, computer, USB cable, etc.