A common misconcpetion but the power rating of the speaker is not what the speakers need but rather what they can handle.
The power rating of a speaker is simply how much power it can handle, not what it needs as that is application dependent and the right power for a speaker is the power it needs to be loud enough without exceeding the capability of the speaker. That means that in any particular application a speaker may require more or less power than that same speaker does in a different application. A speaker cannot be underpowered, however a system can be underpowered for an application, which in turn can lead to pushing the system too hard and that is what can lead to failures.Generally, you want to have an amp that has a greater wattage per channel (at your speaker's ohms rating) than your speaker's RMS by at least 2 times the speaker's rating. In your case, an optimal amp would be one that puts out 500 watts per channel at 8 ohms. This allows you to operate with plenty of headroom, and in stereo. Off the top of my head, the first amp that comes to mind is the QSC GX5:
QSC - GX Series Amplifiers
This is an example of an amp that will power your speakers adequately and in stereo. Until then, don't try and run your speakers in stereo on your amp - underpowering them, believe it or not, can be bad for them!
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