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

Product ID: 174949513

Details

Manufacturer
Douk Audio
Maximum Supply Voltage
24 Volts (DC)
Minimum Supply Voltage
12 Volts (DC)
Mounting Type
Surface Mount
Voltage
12 Volts (DC)

💻3.5mm AUX & RCA inputs

🔊100W max output power

🎚️B/M switch for subwoofer/full-range mode

Description

🎧 Elevate your sound game — small amp, massive impact!

POWERFUL 100 W OUTPUT - Drive passive full-range or subwoofer speakers with crystal-clear, noise-free sound.
DUAL AMP STEREO SETUP - Use two G4 units for independent left/right channels, eliminating interference and maximizing clarity.
UNIVERSAL COMPATIBILITY - Multiple input options (3.5mm AUX & RCA) ensure effortless connection to all your favorite audio devices.
COMPACT DURABLE DESIGN - Sleek aluminum chassis fits perfectly on your desk or HiFi setup, combining style with longevity.
VERSATILE B M MODE SWITCH - Seamlessly toggle between full-frequency and subwoofer modes to tailor your audio experience.

The Douk Audio G4 is a compact, mono Class D amplifier delivering up to 100W of clean power. Featuring a B/M switch for subwoofer or full-frequency modes, it supports passive speakers from 3 to 12 inches. With dual NE5532 op-amps and TI TPA3116 chip, it ensures noise-free, efficient amplification. Its versatile inputs and durable aluminum build make it an ideal upgrade for desktop and home HiFi systems seeking cinematic bass and crisp audio.

Specifications

ASIN	B081Q3VZ9V
Best Sellers Rank	#195,658 in Electronics ( See Top 100 in Electronics ) #1,148 in Audio Component Amplifiers
Brand Name	Douk Audio
Customer Reviews	4.2 4.2 out of 5 stars (179)
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 (DC)
Model	DZ078_US
Mounting Type	Surface Mount
Number of Channels	1
Output Power	100 Watts
Package Type Name	Box
Part Number	DZ078_US
Supply Current	4.74 Amps
Voltage	12 Volts (DC)

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