Spatial M4 TS vs Magnepan LRS

I’ve owned Magnepan 1.7is, and the Spatial M4 Turbos S’. The Spatials are the far superior speakers IMO. I’ve also owned the M4 Triode Masters which can easily compete with some $6K speakers I’ve heard. The Magnepans sounded like the $2K speakers they are. They have good microdynamics, especially in the upper bass (and only if you crank them), and good imaging depth, otherwise nothing special.

The Spatials are also quite easy to drive.

I'd say the TMs are approximately 10% better. Occasionally he has "demo" pairs for a discount.

I did notice some weird frequency peaks with the TM's running off the 8 ohm taps of my Rogue CM-II. With some recordings that are very familiar, I was hearing background noise that I know is supposed to be too low in level to be audible. So I question the flatness of the TM's impedance curve.

I ran the Turbo S' for a short time off the 8 ohm taps, and I don't recall hearing anything unusual, though I don't recall if I used some of the same recordings. I was surprised by how neutral they sounded running off the 8 ohm taps. 

For my needs, if I were to purchase Spatials again, I don't know that I'd bother with the TM version unless I was running a low power SET amp. And the only difference I could tell between the TM and Tubo S compression drivers is that the TM driver has a diaphragm that's also open to the rear, while the Tubo S' is capped at the rear. So the TM is a true di-pole speaker, and the Turbo-s is only half di-pole, with only the woofers emitting sound to the rear.