The PS Audio speakers look intriguing but not sure they’re a good fit for your amp given Stereophile’s measurements, just fyi…
PS Audio specifies the Aspen FR5's voltage sensitivity as 83.5dB/2.83V/m; my estimate was slightly lower, at 82.6dB(B)/2.83V/m, the same as my Rogers LS3/5a. The Aspen FR5's nominal impedance is specified as 6 ohms, with a minimum value of 5.6 ohms. The impedance magnitude (fig.1, solid trace) was higher than 6 ohms over almost the entire audioband; the minimum impedance was 5.89 ohms at 144Hz. This suggests that the FR5 will be an easy load for the partnering amplifier. However, the electrical phase angle (fig.1, dotted trace) is high in several frequency regions; as a result, the effective resistance, or EPDR (footnote 1), drops below 4 ohms from 39Hz to 46Hz, from 78Hz to 139Hz, and from 2.78kHz to 3.75kHz. The minimum EPDR values are 3.5 ohms at 43Hz, 2.6 ohms at 96Hz, and 2.78 ohms at 2.8kHz. The Aspen FR5 needs to be partnered with an amplifier that doesn't have a problem driving low impedances, and this will be exacerbated by the speaker's low sensitivity.