Sounds like
@krichard2496 probably has all the same measurements
@amirm would do. Perhaps he'd be kind enough to share those in the separate thread when I post the A/B recordings. I have a Pro Tools setup and BlueCat frequency analyser plugin, so maybe I'll play around and see if there is any objective data I can glean between the two as well. Stay tuned..
The conventionally measured specs of the MM-6 will be fairly similar to the MM-5.
The differences between our products are potentially measureable, we don't claim they are not, but we don't know of any practical way to show them in a fully completed product. We estimate that some of the capacitor and resistor differences are on the order of -140dB to -170dB, as shown in the late Cyril Bateman's excellent set of articles in Electronics World in 2002 and 2003. Jan Didden of Linear Audio has an excellent repository.
https://linearaudio.nl/cyril-batemans-capacitor-sound-articles
As you can imagine, these differences are throughly submerged in noise. We believe the human ear is so discerning that it can hear far into the noise floor. Therefore, practical listening tests and iterative changes in the product development cycle are critical to the final product.
Our internal testing regimen is varied including a large assortment of analog test gear. We don't have a clean way to visually present it. However, as Amir noted, his measurements (basic though they are) do largely agree with our quoted specifications.
We would challenge Amir to develop a SINAD test that weights the harmonics at N^4, that is, each harmonic is raised in the summation to the 4th power. This was proposed by Shorter in 1949 and is commented on in RDH4 (1953). We believe that this would go a long way to unifying the subjectivist and objectivist assessments.
As 72 years have passed, we won't be holding our breath, however.