Question: This states it's a 2x4w amp. But at 12v and 2 amps it seems it should be more around 24-36 watts, and back says "100 watts". Thoughts?

The specs rate this amp at 18w per channel into 4 ohm speakers using a 12v 2amp power supply. They don't say if that is RMS or peak power. Forget AxV=W, even the led bulbs burn power. I'd expect 10-15w into some inexpensive speakers that aren't pushed to hard.

Can I use it as a preamplifier? I was thinking to connect the output to a poweramplifer step after this one.

No, the outputs are already amplified. They would blow the inputs to your Poweramp...if the inputs are rca connector and standard audio output.Guess I would ask why you would want to do this... Although some power amps do allow stereo output for input.... You would have to check the spec on your power amp to see if it allows amplified inputs.... They will usually be speaker terminal inputs for speaker wire. While this amp is nice, one should not expect it to shake your auto!

What size plug does this use and what is the polarity? Wiring to 12v auto batter not 110v home.

According to the manual the plug is described as: DC plug size: 2.1 mm x 5.5 mm DC input polarity: Center positive

Is it possible to hook Bluetooth up to this amp?

Indeed. I have $5 Bluetooth receiver I picked up at Autozone one day feeding it via a 3.5mm strereo (headphone) to RCA cord. It's pushing two 5.25 Pyle marine speakers in a splash down, DIY, mobile unit made from an old cooler. Sound is clean, especially after some tweaking with a good amp/equalizer app on my phone. Fishing is always better with tunes!

Item Dimensions	4.29 x 3.5 x 2.01 inches
Number of Channels	2
Package Type	Retail package
Minimum Supply Voltage	12 Volts (DC)
Mounting Type	Table Top
Voltage	12 Volts

MA170 - NO PSU

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