What should I upgrade?

You want it all.., like the rest of us.

That's a fairly large room. I would think, that to add some dynamics and bass to rock music, you either have to get larger panels like the 3.6's or add a sub. I would think that adding a sub would give you more slam and dynamics, than getting larger panels. It's tough adding a sub to the Maggies and having them blend right. Many people here suggest 2 subs to better balance out room modes, and cancel out standing bass waves. But, I would try one first to see how you like it.

Your current amp is fine power wise, 300watts into 4 ohms. However, if down the the line, you want some more refinement, ease, fluidity, bigger soundstage and lower noise floor, then you may want to upgrade to Monoblocks.

I love the Bel Canto gear, though. I've owned the DAC3, and I would think that a pair of Bel Canto Ref 1000 Monoblocks are in your future. I still have a pair now, and I think they're great.

Let the addiction begin..,

Rich

I don't own nor have I heard any of the gear in this thread. But I DO own some Martin Logans and love them.

My semi-educated suggestion would be to treat your room with bass traps in all four corners (I use Auralex) to reduce the boom and clean up your transients which are actually mid range frequencies. Your room is an echo chamber. You have to soak up the bad stuff before you venture into refined bass response. You'll be amazed at the difference and have a good starting point for "real" bass.

Then audition a Fathom (or a SVS PB13 for less money) to give you the best of both worlds. Clean and powerful.

I have an SVS PC13 that was $1500 new and blends well with my panels.

FWIW from a mid-fi enthusiast.

Brewed

Sorry I forgot to mention I have a pitched roof. on one sid it starts at 8ft and goes to 12ft. there are also 7 exposed wood beams that run along the ceiling. Where would I place bass traps and/or acoustic panels?

I believe that a pitched roof with beams on the ceiling will actually help break up any unwanted bass modes.

Before we worry about bass traps, perhaps we should get some bass first ; )

Rich

You need one Jl Audio F 113 or two of the smaller F 112 which are magnificent subwoofers.

Your room is huge, and the Maggies 1.6 are really too small for this size room 3.6 would be better,

More power couldn't hurt either it depends on how loud you play and how far away from the speaker you are.

The JL audio subs are really fast and blend well with these types of speakers, one of my customers had this subwoofer with a pair of $45,000.00 Scaena loudspeakers and the woofer could blend with this speaker which is really fast as well.