good monitor speaker for a large room


my room have a 20feet x 20feet whith cathedral top. I search for a monitor speaker whit rock bass my budget is between 1k$ to 3k$ used. Any sugestion please
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In my limited experience the Krell Resolution 3 is the most dynamic monitor i have personally auditioned and has very good bass. (updated nodel is the Krell Res 4) That being said it is still a monitor with limited extension and you have a large room, so it will sound as such. What are you trying to accomplish? Do you have a sub?
Revel M20. You will not need a subwoofer. Very highly reviewed. You can get them used here on Agon for a fair price.
Many reviewers use this as their reference monitor.