I don't own Merlins, but respect them a lot and have a couple of friends with Merlins.
My suggestion would be that you look for an amplifier with a fairly high output impedance, as at least to my ears the Merlins are overdamped in the bass region. A high output impedance means the same thing as a low damping factor. Single-ended triode amps and OTL tube amps are good candidates. Such amps will "warm up" the bass a bit, improving the overall tonal balance. As a welcome side effect, such amps also tend to sound very good, especially when they employ little or no negative feedback. I have heard the Merlins sound very good on OTL amps with a 4 ohm output impedance (corresponding to an 8-ohm damping factor of only 2).
Duke
My suggestion would be that you look for an amplifier with a fairly high output impedance, as at least to my ears the Merlins are overdamped in the bass region. A high output impedance means the same thing as a low damping factor. Single-ended triode amps and OTL tube amps are good candidates. Such amps will "warm up" the bass a bit, improving the overall tonal balance. As a welcome side effect, such amps also tend to sound very good, especially when they employ little or no negative feedback. I have heard the Merlins sound very good on OTL amps with a 4 ohm output impedance (corresponding to an 8-ohm damping factor of only 2).
Duke