Hola. The Monolith IIIx are great speaker, but if I were you, I will change them for the new Summits. The Summits are IMHO the best product of ML. The dynamics, and size of the instruments, the air between them, the stage, the micro details are breath taking. Your Monilith panels are the size of the CLSs and also you have a 12" woofer. But this new Summits offers more than that. You have 2 power digital amps of 200 W/each driving 2 woofers of 10" built in...You can control better your low frequency room resonance...you have controls at 25 Hz and 50 Hz +-10 dBs. Also, the sensitivity of the Summits panels are 92dBs, so now you can use small power amps (because they sound better than the big amps) even with Levinson to drive then easy. Go for them, you won´t regret it!!! Listen carfully both with the same music material, and make up your mind which you like most...trust your ears. Happy listening,
Pura vida,
Roberto.