Chapman,
I own the AES Sixpacs. They are great amps and sound fantastic with my 8 ohm + speakers, but I have found that they lose dynamics and transient attack on lower impedance speakers.
I haven't heard a Chapman, but these are built like tanks, and sound excellent when driven within their limits. Depending on that impedance curve though, I might recommend a high current SS amp.
I own the AES Sixpacs. They are great amps and sound fantastic with my 8 ohm + speakers, but I have found that they lose dynamics and transient attack on lower impedance speakers.
I haven't heard a Chapman, but these are built like tanks, and sound excellent when driven within their limits. Depending on that impedance curve though, I might recommend a high current SS amp.