Maggies will never deliver "oomph" type bass. NEVER. It does not matter what they are connected to.
Having said that, your amp is plenty powerful ( 600+ wpc @ 4 ohms ), but the bass is somewhat lean or on the "highly controlled" side of neutral. Combine that with a speaker that is not known or capable of "thundering bass" and you've got a system that will be lacking in bottom end authority. Once you understand that, it may make some decisions a little easier for you to navigate. The amp can be modified and help some of this out, but it won't solve the lack of displacement that the Maggies themselves aren't capable of.
Before spending any money though, i really would work with speaker placement. Dipolar panels can produce very natural and satisfying bass, so long as one doesn't expect "slam" out of them. Most of the problems typically come from less than optimal speaker placement. Due to the radiation pattern of these speakers, it is very easy to actually increase bass cancellation at low frequencies. Most people don't want to place them properly in a "shared room" as such a design is not real room friendly in terms of "traffic patterns". This speaker DOES have a lot to offer, but there are a few more trade-offs involved that one must deal with in order to get the full benefits of the design.
Since your amp is a true voltage source and your speakers are lower than average impedance, you really need to pay attention to the proper selection of speaker cabling. The use of a low impedance speaker cable will increase current flow between the source ( amp ) and the load ( speaker ). Large volumetric displacement of air and high levels of current are what give you very tight, high output bass with good control.
On the other hand, you can use a speaker cable that is very high in inductance. This will roll-off the top end and shift the tonal balance to something warmer. The problem with doing so is that you tend to lose high frequency articulation, air, separation of instruments, etc...
My one suggestion out of all of this is to get the parts that you already have working as good as is possible within the room that you have. After you've achieved that, and if you're still not satisfied, you might want to think about supplementing the bass or correcting other areas that you're not happy with. If you don't do this, you'll end up introducing more variables into the equation, making it harder to figure out exactly what is going on in the big picture. Keep it simple until you can understand exactly what it is your dealing with and need to do. Sean
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