Hello. i just unpacked my unit, and when i plug it in, the led display does not come on, how do i get it to activate? is my unit broken?

I believe your unit may be broken.

Speakers a and c work but b and d do not. not even the same channel, any ideas ??

Kenneth's answer isn't correct. The subwoofer connects through the RCA port on the lower right. I'm not sure why only half of your speakers are working.

Is this unit a blue-tooth receiver or a blue-tooth transmitter?

think of it as an audio receiver through a Bluetooth or aux connection - your phone would connect to it over Bluetooth (or a stereo 3.5mm cable if your phone has a headphone jack) and send Spotify or other music to this device, which would send the audio out through speaker wires.

ASIN	B097C6BLHY
Best Sellers Rank	#89,093 in Electronics ( See Top 100 in Electronics ) #570 in Audio Component Amplifiers
Brand	Facmogu
Date First Available	June 16, 2021
Item Weight	2.12 pounds
Item model number	A18301-MG-US
Manufacturer	Facmogu
Material	Plastic, Metal
Maximum Supply Voltage	12 Volts (DC)
Minimum Supply Voltage	12 Volts (DC)
Mounting Type	Surface Mount
Number of Channels	4
Output Power	800 Watts
Package Dimensions	10.71 x 8.19 x 2.64 inches
Package Type Name	box
Specification Met	Internal/Unspecified Industry Standards
Voltage	12 Volts

Facmogu S-299 4.1CH Bluetooth Power Amplifier with Active Subwoofer Output (NOT Passive Subwoofer), Max 800W RMS 40Wx4 Subwoofer Amplifier Hi-Fi Integrated Mini Speaker Amp Audio Sub Bass Amp

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