mmats smt4090 amp

1. There is a toggle switch that can be set on either AP, HP, or LP. What do these settings mean?

2. On the bottom of the amp, it diagrams the connection settings. It shows if you're going to use this as a 4 channel amp, it is operating in 2 ohms. Does this mean I need to match this with 2 ohm speakers?

3. In the power connections for the amp, there is a battery (-), battery (+), and remote. What is the remote for?

4. Any recommendation for size of wire to use in this installation.

Thank you!!

The switch is for the internal crossover.  AP = All Pass,  this allows all frequencies to get to the speakers.   HP = High Pass, this allows all frequencies above the crossover point to reach your speakers.  LP = Low Pass, this allows all frequencies below the crossover point to reach your speakers.  If you let us know what speakers you are planning to connect to the amp, we can tell you where to set these switches.  There should be a know or another switch to determine the crossover point.  Do you see such a control?

The amp is capable of running 2 Ohms per channel minimum.  It can run 8 or 4 ohms per channel.  2 Ohms is the lowest it can safely run.  2 Ohms per channel is the same as a 4 Ohm mono load.  You can run the front 2 channels on your doors and or rear deck speakers, and use the other 2 channels to run your woofers. 

The remote wire is what tells the amp to turn on and off with your radio.   If you are connecting it to your factory radio, you should connect this terminal to a wire that is controlled with the accessory position of your key.  If you tell us what kind of vehicle you have, we can tell you which wire to use for this.   If you have an aftermarket radio, this terminal is to be connected to the Blue/White wire of your radio.  If it has no Blue/White wire, but it does have a Blue wire, connect it to that one.

Does the amp have fuses mounted to the end of it?  If so, how many and what is the current rating of the fuses? 

You will want to run the crossovers in the HP mode.  If the crossover points are infinitely adjustable, around 80Hz should be a good starting point for both.   If your radio has adjustable crossovers built in, you may want to use those and set the amp's crossovers set to AP