The Mackie SRM450 is an extremely versatile speaker. It has the advantage of built in amplifiers, together with thermal and overload protection. I run a hire firm, pa2hire.co.uk, and we like these for several reasons - for one, they are difficult to damage, you can't overdrive them very easily as the limiter kicks in. Secondly, they have excellent sonic characteristics. We also use d&b Q7 and HK concert touring (contour) speakers, these are far more expensive, but the Mackie SRM450's stand up surprisingly well - especially at moderate volumes. The more expensive speakers sound a little more hi fidelity, but you certainly pay for this. The dispersion pattern is wide, and very even. There is no tendency for beaming (high directionality at high frequencies). Of course the other nice thing is you can use these as powered monitors, side or front fills, drum fills, or front of house, so they really are multi-role. On the down side, some may find they are a little heavy. But quality is heavy, honestly! They are a bit lighter than some of the competition. They also have a tendency to cut out if pushed very hard for a prolonged period. This is the thermal cut-out on the amplifier, you can tell right away as the blue light goes out. It can happen if you feed too much bass into them, so it's a good idea to use the low-cut switch to help.
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