Unbless you are building a wall...I would never give up my back seat. I built "The Pace-Maker" which won IASCA Enhanced SPL Nationals in 91,92,93 & 94.
bandpass box is a quick way to get a nice bass sound. First I would need to know what type of vehicle this is being installed in to come up with the corre3ct dimensions for a custom box.
Things to check: Is the wire between the amp and the subs heavy enough to pass 167 amps? 2000 * 12 = 166.66666 amps. Max volts on the subs are 10 volts....close enough. Are you sure you're using the line out on the head unit? You may be over driving the amp if it's anything else.If the head unit doesn't have line out connectors then you'll need to get an attenuator for each channel. Do you have caps on the 12 v power in wires? They'll keep the headlights from dimming and the alternator will last longer if you do.