Primaluna Dialogue Premium HP Driving PSB Imagine T2s

As shown in Stereophile’s measurements the impedance of your speakers dips to around 2.4 ohms in the vicinity of 500 to 600 Hz, and rises to more than 8 ohms in the vicinity of 2 kHz. Also, Stereophile measured the effective output impedance of the Dialogue Premium (not the HP version) as being relatively high for some output taps and modes, and extremely high for others. The interaction of that kind of speaker impedance variation and those output impedance characteristics will tend to give greater emphasis, compared to your solid state Creek amplifier, to frequencies at which speaker impedance is high (i.e., especially around 2 kHz) and less emphasis to frequencies at which speaker impedance is low (i.e., especially around 500 to 600 Hz).

I would expect the degree of that difference to be somewhat less, however, with the Dialogue Premium HP, as it probably has lower effective output impedances than the non-HP version given the doubled quantity of power tubes.

Whether or not you would find that tonal difference to be preferable with the particular speakers in your particular room, and whether that difference would be overshadowed by differences in the intrinsic sonic characters of the Creek and PrimaLuna amps (which I would expect to be considerable), I of course can’t say. But in addition to the power and drive capability of an amp, and its intrinsic sonic character, the tonal effects of impedance interactions between amp and speaker are also a factor that should be taken into consideration IMO.

Good luck. Regards,
-- Al

+1 to Donjr’s comment. It is entirely possible that a great speaker used in combination with a great amp that has adequate power and drive capability will result in mediocre sonics, or worse. Per my earlier comment, that is especially possible if the amp has particularly high output impedance (which would also mean it has particularly low damping factor), as appears likely to be the case here based on Stereophile’s measurements of the non-HP version, and the speaker’s impedance ranges from low values to high values at various frequencies (as is the case here, even just within the midrange region).

At the same time, it is entirely possible that the result would be wonderful. But there’s no way to be sure without trying the specific combo.

Good luck. Regards,
-- Al