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New mesa subway amps and cabs!

I stand corrected.
Do you think the WD800 will be as sensitive to tube rolling as the WA?
I've spent some time rolling tubes and can name 5 amps that changing the pre-amp tube(s) made no difference in tonality.

The WA was the most sensitive and in a good way.

The impact if V2 is folded into the output management circuitry (in some ways similar to the concept used in the D-800/800+) and V1 is a fairly traditional circuit that will exhibit some variation but the biggest impact is in the plate curve differences, which is why the 12AT7 is IMO a better choice for both tone and feel.

Not interested in a new amp......unless Mesa made a 800 watt small digital power amp for bass. I have good preamp pedals I use to shape my sound.

Ummm, we do. All of the Subway amps include an aux input that is exactly the same as the power amp input on a stand alone power amp. The preamp is available as a back-up if you find that you need it (or decide not to use your pedals for a gig or practice). Also, it should be noted that there is nothing digital about the Subway amps, nor any other class D amps for that matter (except for those that incorporate DSP within the signal processing path, such as the new Bergantino's, TC, etc.)

With a built-in backup preamp!

Yup, we think of everything ;)
 
Yes, it will if he's not very careful and doesn't exercise good judgement and common sense. Even with the 8 ohm cabinet, though running the amp in 2 ohm Mode will help by reducing the rated power to 300 watts from 400 watts.

The WD800 was the amp you were referring to when I asked you about 9 or 10 months ago if there was something coming along from Mesa that would be like my beloved Walkabout head but with more power, wasn’t it?
 
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The Power Amp Damping control sounds like it might be the kind of special sauce that I like for DB. If the input impedance was 5 MOhm I’d be sorely tempted!

Depending on the specific pickup, most piezos used for upright (with the exception of the smaller Underwood models) sound and feel the best around 1M. As the impedance goes up, the damping of the pickup can fall, making the bass feel somewhat sloppy.

Isn’t 2Ω mode the mode that outputs the most power, or is something else going on?

No, in 2 ohm mode the available power decreases because the rail to rail swing is reduced.