Probably the internal fuse or the amp blown. If these are the MK1 they are notoriously unreliable and you can't even change the fuse without stripping the thing down. Sound OK when working but don't expect them to keep working if you want to drive them hard. I know of some people who have changed them to passive and put a crossover in them (I suppose it at least means you have a speaker but defeats the object of active) There are plenty of independents who fix these as they are so problematic but if you can get a pair of decent speakers. The MKII is supposed to be much better but still has some issues with reliability.
SOURCE: hi; My mackie srm450 is not giving bass anymore
FIrst of all this is not a repair site per se. We help by providing information that you may require to repair something.
For your specific problem, there can be many causes. The speaker itself can be defective, the amp may be blown or the crossover could be malfunctioning. Without seeing the actual unit, I cannot possibly know which is the case. These are decent units and rarely fail in this manner. In my experience, the likely problem is the speaker itself. You can contact Mackie directly for a replacement. If you have an ohmmeter, disconnect one of the speaker wires and measure across the speaker terminals. You should read either 6 or 3.6 ohms. If you read infinity, the coil is open and the speaker must be replaced. If you feel that you cannot attempt this repair, please update this with your location so I can suggest a repair facility close by.
Thanks,
Dan
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