I own a pair of the Forte III's and I'm willing to bet they will sound good with just about any amp. Your Pass Labs XA-25 will be fine.
I have used the following amps with great success: Plinius SA REference, Luxman 590 AXII, Allnic T-1500, Conrad Johnson Classic Sixty SE, Class D Audio SDS-470C, Marantz 2215, 2252, 2270.
I have used the following amps with great success: Plinius SA REference, Luxman 590 AXII, Allnic T-1500, Conrad Johnson Classic Sixty SE, Class D Audio SDS-470C, Marantz 2215, 2252, 2270.