What load does this amplifier run at?

It is a monoblock rated at 1 ohm, so it is meant for subwoofers wired to a 1-ohm final load. Check your subs' voice coils to confirm you can reach that impedance.

How much space does it need?

The chassis measures about 5 by 19 by 11 inches. Plan a flat mounting area with room for airflow around the heatsink.

Will my stock electrical system support it?

An amp of this rating draws heavy current. Most builds at this level need an upgraded alternator, a large battery and short, thick power cable.

Is it only for subwoofers?

Yes, it is a mono bass amplifier. It is not intended for full-range speakers, which need a multi-channel amp.

What should I check before buying?

Confirm your subwoofers' impedance, your enclosure's power handling and your wiring and charging capacity. The amp's rating should match the subs, not exceed what they handle.