I do not like your idea of Bowers 805 D3, certainly not with the luxman amp.
bowers specs below: only 88db 1w 1m, that's low efficiency needing more power.
yes those speakers with McIntosh MC275
yes those speakers with Carver Crimson 275
but,
they will need a pair of powered subs, they are bass limited,
42Hz to 28kHz
(+/-3dB from reference axis)
and, I don't like ports.
Description
2-way vented-box system
Drive units
1x ø25mm (1 in) Diamond dome high-frequency
1x ø165mm (6.5 in) Continuum™ cone bass midrange
Frequency range
34Hz to 35kHz
Frequency response (+/-3dB from reference axis)
42Hz to 28kHz
Sensitivity (1m on axis at 2.83Vrms)
88dB
Harmonic distortion
2nd and 3rd harmonics (90dB, 1m on axis)
<1 % 70Hz - 20kHz
<0.6% 120Hz - 20kHz
Nominal impedance (min)
8Ω (minimum 4.6Ω)
Recommended amplifier power
50W - 120W into 8Ω on unclipped programme
....................................
I would find full range non-ported speakers to use with a tube amp, efficiency 90db or above, then look for tube amp 35-45-75 wpc.
or, for smaller speakers, non-ported mains, still 90db efficiency, with less bass, combined with a pair of self-powered subs.
