A slight correction to my earlier post: The reference to a 0.5 ohm output impedance of the MC2301 applies to the 8 ohm output tap of the amp. If the 4 ohm tap is used instead (and that tap stands a good chance of being sonically preferable with this speaker in terms of amplifier loading), the output impedance would be about 0.27 ohms, bringing the tonal effects of impedance interaction somewhat closer to those of a solid state amp.
Sam -- thank you kindly!
Best regards,
-- Al