Can anybody tell me definitively--no guessing please--that the aux input is stereo? Is it only inputting one channel (left or right), or summing them?

The system is just giving you a mono signal the subwoofer output on your receiver is just a mono signal unless you have a right and left output. I have never heard of right and left output before for a subwoofer, but I guess there is always a possibility.

Is this a good choice for a center channel speaker?

It may work for you, depending on your speaker, the amp on other speakers, the other speakers, your set up (assuming you have something to feed a distinct center channel) and your room. I wouldn't. How many volume controls do you want to get up and mess with? If you're trying for a home theater setup, you'll be happier with Amazon's entry level Onkyo 5.2 system at $329. Use the speakers you have and upgrade as you can afford. On the other hand if this is a dorm room, go for it.

I have a powered subwoofer but need to combine left and right channels with a cross. will this conflict with my powered sub?

probably not a good fit with a powered sub unless you are replacing the amp in that sub.

can it handle a 12 inch sub 200watts?

It can drive the speaker, but how well will depend on the efficiency of the speaker and not just the size and watts it can handle.

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Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W

Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W

Product ID: 353867969

Details

Manufacturer
Douk Audio
Maximum supply voltage
24 Volts (DC)
Minimum supply voltage
12 Volts
Mounting type
Freestanding
Voltage
12 Volts (DC)

🔊100W peak power output

🔌3.5mm AUX & RCA inputs for versatile connectivity

🎚️B/M switch for full-frequency or subwoofer mode

Description

🎵 Compact power, cinematic impact — your sound’s new secret weapon!

COMPACT STYLISH - Sleek aluminum chassis fits perfectly on your desk or home HiFi system without sacrificing power or durability.
POWERFUL 100 W OUTPUT - Drive passive 3-10 inch full-frequency or 4-12 inch subwoofers with crystal-clear sound and zero audible noise.
STEREO UPGRADE READY - Pair two G4 amps to independently power left and right channels, eliminating interference and delivering immersive 2.1 surround sound.
DUAL MODE FLEXIBILITY - Easily switch between full-frequency and subwoofer modes to tailor your audio setup with the B/M switch.
UNIVERSAL COMPATIBILITY - Supports 3.5mm AUX and RCA inputs, making it seamless to connect with a wide range of audio devices and elevate your sound experience.

The Douk Audio G4 is a compact, mono digital power amplifier delivering 100W of clean, noise-free output. Featuring a versatile B/M switch, it supports both full-frequency and subwoofer modes, compatible with 3.5mm AUX and RCA inputs. Its durable aluminum design and ability to pair two units for stereo output make it an ideal upgrade for any HiFi or desktop audio system seeking immersive, cinema-quality sound.

Specifications

Asin	B081Q3VZ9V
Brand Name	Douk Audio
Customer Reviews	4.3 4.3 out of 5 stars (165) 4.3 out of 5 stars
Included Components	1G4 Mono Amplifier; 119V Power Supply; 1*Manual
Item Weight	240 Grams
Manufacturer	Douk Audio
Material Type	aluminum
Maximum Output Power	100 watts
Maximum Supply Voltage	24 Volts (DC)
Minimum Supply Voltage	12 Volts
Model	DZ078_US
Mounting Type	Freestanding
Number Of Channels	1
Number Of Items	1
Number Of Packs	1
Output Power	100 Watts
Package Type Name	box
Part Number	DZ078_US
Specification Met	Technical Specifications Met
Supply Current	4.74 Amps
Unit Count	1 Count
Voltage	12 Volts (DC)

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