I have Forte IVs driven by an Elekit 300b tube amp, and they're absolutely balanced and dynamic at any volume. When driven by the Rogue Sphinx Class D hybrid they are more treble forward, so systems matching is critical. I demoed the Fortes and Cornwalls with PrimaLuna integrateds and that was also an excellent match for the Klipshes.
One thing that was an issue was choice of speaker cable - when trying to drive these with a cable made from Mogami wire I found that the Fortes sounded etched, thin, and too bright. Using a run of 12 gauge Belden OFC speaker cable provides a full, balanced sound. I assume this is the combined capacitance/inductance values of Mogami not playing well with my system.