Question 1

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?

Accepted Answer

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.

Question 2

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

Accepted Answer

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!

Question 3

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

Accepted Answer

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

Question 4

Is it possible to hook Bluetooth up to this amp?

Accepted Answer

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!

ASIN	B007TUSXEY
Best Sellers Rank	#120,366 in Electronics ( See Top 100 in Electronics ) #719 in Audio Component Amplifiers
Brand Name	Kinter
Customer Reviews	4.2 4.2 out of 5 stars (4,116)
Global Trade Identification Number	08850273109052
Included Components	Amplifier and instruction manual
Item Dimensions	4.87 x 1.62 x 4.62 inches
Item Weight	0.1 kg
Manufacturer	Kinter
Material Type	Aluminum
Maximum Output Power	36 watts
Maximum Supply Voltage	14.4 volts_of_direct_current
Minimum Supply Voltage	12 volts_of_direct_current
Model	MA170
Mounting Type	Table Top
Number of Channels	2
Number of Items	1
Number of Packs	1
Output Power	18 watts
Package Type Name	Retail package
Part Number	MA170
Specification Met	Yes
UPC	714439615932 600748147571 849649090955 609224910524
Unit Count	1 Count
Voltage	12 volts

Kinter MA170 12V 2 Channel Mini Digital Audio Power Amplifier for Car or Mp3 Without Power Supply

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