Is it possible to power this from the back instead of the front—without voiding the warranty/soldering?

Yes,there are 2 wires in the package,the black and red (2 color)wire is for connect with DC12V.it should be plug at the back of wall plate,and then conenct with DC12V power supply.

Is it possible to add on more speakers with the same Amplifier

Adding more speakers affects the output power

Can a subwoofer be connected to these?

No, the subwoofer is a special subwoofer amplifier output.

The power supply adapter plugging into the front: Is there another option to supply power to this unit in the back somewhere instead of the front?

Dear Consumer This amplifier has two ways of connecting to the power supply: Our package comes with a 3A power adapter, and a 12V DC power cable If you want to connect to the power supply from the rear panel of the amplifier, you can use our 12V DC cable to connect, please refer to the manual for details after receiving the product!

Material	Polypropylene
Model Name	HCS5022+16BT
Speaker Type	Coaxial
Special Feature	Wireless, Bluetooth, Amplifier
Recommended Uses For Product	For Surround Sound Systems
Compatible Devices	Laptop, Tablet, Smartphone
Subwoofer Diameter	5.25 Inches
Surround Sound Channel Configuration	2
Colour	blue
Included Components	1x in-wall compatible with bluetooth audio receiver wall plate, 1X AC adapter, 2 x speaker wires, 2X in ceiling speakers, 2X screws
Age Range (Description)	Adult
Impedance	8 Ohm
Is Waterproof	FALSE
Brand Name	Herdio
Colour Name	blue
Product Dimensions	18.49 x 14.91 x 7.19 cm; 2.34 kg
Manufacturer	Herdio
Item Weight	2 kg 340 g

Herdio 5.25 Inch Bluetooth Ceiling Speakers with Wall Mount Control Amplifier Receiver System for Home Living Room Bedroom Bathroom Office (A Pair)

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