If wanting American assembled, the Ascend Acoustics Sierra Tower with RAAL upgrade, one of the best out there <$5000, and it’s 90dB sensitive (Soul Supreme is 91.5dB, the Prana is 89.5dB), so unless you sit far, it’ll get loud enough.
I know you have tubes, but Zu’s only exist as a compromise for people with tubes, focusing on easy loads and that’s it:
https://www.stereophile.com/content/zu-audio-soul-supreme-loudspeaker-measurements
Poor imaging/soundstage, poor vertical dispersion, and the treble is “loose”.
Don’t know much about the Prana, but you are bound to have midrange leakage out of that port.
I know you have tubes, but Zu’s only exist as a compromise for people with tubes, focusing on easy loads and that’s it:
https://www.stereophile.com/content/zu-audio-soul-supreme-loudspeaker-measurements
Poor imaging/soundstage, poor vertical dispersion, and the treble is “loose”.
Don’t know much about the Prana, but you are bound to have midrange leakage out of that port.