What can a 800 watts amp play - SPL Dynamics Z2X-820 Car Audio Amplifier

Look for a 4-channel amp that pushes 50 watts RMS @ 4 ohm.
Make sure the amp is CEA-2006 compliant.
Ignore peak or max watts as these are arbitrary numbers.

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All sound equipment has to operate without overloads in any given place. The power source should always be examined at commercial gigs and worked out with other performers along with management. The only fix is to do these checks up front and make safe arrangements.

yes, but you would not get the same performance as you would if you gave them the suggested power. I have found that it is always better to use a more powerful amp than your subs are rated for (as long as it is clean, high quality, low distortion power). I have had the best luck with name brand amps (kicker,rockford fosgate,phoenix gold,etc...). I hope this will be helpful to you.

If you are referring to the Kicker L5 solo-baric subwoofer, then an 800 watt peak amp will not blow even one of those subs. The L5 is capable of handling 1000 watts peak and 500 wrms. An 800 watt peak amp will usually have around 400 wrms. Underpowering the subwoofer will not hurt the amp or the sub(s).

Does your fuse blow when volume turned up, or does it blow straight away when turned on? What watt is your subs and amp?

Make shure your running thick guage wire like 2-0 guage wire to get correct power to it also and check on amp the ohm's it can handle to make shure your not running to makny ohms.

make sure you ground wires arent shared, meaning run each ground wire from each amp to its own grounding point

sounds like your over working your amp 800 watt on a 2000 watt sub. might wanna upgrade your amp

Swap the wires from one speaker to the other to see if it is the speaker or the Amp/wires. 

its says 800 watt and you say 20 watt bass amp?? Is this for a car or a guitar??