Personally to my ears when A/Bing both units the Mackie 150 would suit an Acoustic guitar/Vocal player better sonically for a monitor & you'll hear that if you do the same vs using it with a Arranger keyboard with full band frequency....I too wanted to love the Mackie 150 & I'm a Mackie man all the way using the Srm 450's as my PA & their Mixers also, but I had to go with the CM30's for my needs this time around I really enjoy them....go listen & make your own choice for your needs.