Merlins are funny animals. I've had VSM SE's for 5+ years. They can be incredibly convincing - A prominent L.A. area high end dealer came to my home to set up a new 'table and was astonished by the VSM SE's driven by Cary 300B SET's. Subject to ultimate volume limitations, the dynamics from this set up are absolutely startling and vocal reproduction is about as good as it gets.
However, whether using the low power Carys, medium power Cary 845 SETs, medium powered SS Krells, or high power Odyssey SS amps, (yes, I admit that over the years my amp collection has gotten a bit out of hand!) the Merlins always sound a bit thin through the mid bass. Though reasonably neutral, the tonal balance is just a bit lean and the bass alignment highly damped (especially for a ported design).
My guess is that a sub probably isn't the answer - the issue (I'd hesitate to call it a problem) is higher up the frequency ladder. In short, the Merlin SE's are terrific if your taste doesn't demand a warmer tonal balance. Hope these observations help.
However, whether using the low power Carys, medium power Cary 845 SETs, medium powered SS Krells, or high power Odyssey SS amps, (yes, I admit that over the years my amp collection has gotten a bit out of hand!) the Merlins always sound a bit thin through the mid bass. Though reasonably neutral, the tonal balance is just a bit lean and the bass alignment highly damped (especially for a ported design).
My guess is that a sub probably isn't the answer - the issue (I'd hesitate to call it a problem) is higher up the frequency ladder. In short, the Merlin SE's are terrific if your taste doesn't demand a warmer tonal balance. Hope these observations help.