Tell us about yourself!
Conventional knowledge would dictate that the speakers should be at a higher wattage yes, here is the trick though. You don't always run your amp at 100% of it's power output for several reasons. basically you should always leave yourself a margin of error or a fail safe. Let's put this into a practical application. 900W sub 1000W amp. So if you run your amp at 800W (80%) roughly chances of damage are low and your sub will also run at 800W which means that you will never push the sub beyond what it is capable of.The opposite config would see a sub at 1200W and amp at 1000W so what are you gonna do? run that amp at maxW. That's how you blow stuff up. sub will be fine but you'll kill the amp. its just my formula.Which costs more? new amp? new speaker?
The rule of thumb is that you can run more than one speaker depending on the impedance of the amplifier. you can run an 8Ohm speaker on a 4Ohm stable but not the other way round. you can also run 2X8Ohm speakers on a 4Ohm stable without damage to the amplifier. My normal trick is to make sure that the speakers however are underpowered for the amplifier whether in terms of PMPO or RMS so that there is never too much load on the Amplifier. Otherwise as an alternative I choose to never run the AMP at more than 80% Output.
Well done, If I were you though I would have gone one better and bought an external HDD casing. One can always use extra storage