Goldenear Triton One bass setting

On my Triton Ones, my left channel is set at 11 o' clock and the right one at 12 o' clock.  The reason is the left channel is very close to the back wall where the right channel is much further away.  Best bet is to play a bass track on repeat and start at the 11 position and adjust up or down until the bass is to your satisfaction.  There is no wrong way.

https://www.audiocheck.net/audiotests_subwooferkicktest.php

Like the test says, the tracks with deeper bass should sound the same loudness as the ones with less bass, only difference should be extension.

Is there a CD that has good frequency tracks and use a sound meter on my iPhone to measure to get a flat response?

You will never come close to a flat response in your listening room, nor would you want it. If you are looking for bass tracks to adjust your woofers on the Triton Ones, here are my recommendations on what I used on both my Triton Ones and Triton References for the tightest and cleanest bass and the proper level:

Dead Can Dance, "Spiritchaser" Listen to the first song
Kim Simmonds & Savoy Brown, "The Devil To Pay" first song Ain’t Got Nobody
Stanley Clark, "Journey To Love" First song, Silly Putty
Bob James & Earl Klugh, "Cool" First song
Grand Funk Railroad, "Closer To Home" Sins A Good Mans Brother
The Who, "Live At Leeds" Magic Bus

I'm sure others have their favorites as well.

Why would you have one speaker closer to the back wall than the other? Please explain this.