Were is the subwoofer connection?

Coax/opti1 is supposed to be a sub out also. I've heard earlier models did not function this way, but recently purchased units through Amazon should work. You'll need a 3.5 aux to rca cable for it to function I believe. I hooked up a powered sub to mine using the high level speaker inputs on the sub.

What is the rated power output per channel at 8ohms, and the THD%?

The rated power output is 45w+45w @8ohm, THD + N = 0.04%

When using the sub-out with a powered sub can the sub volume or levels be controlled via this unit?

Yes, and no. The SMSL's sub output level is variable, and raises/lowers in sync with the amps volume position, but you still have to set the master volume (for the sub) on the powered sub itself. I've got mine parked at about the 11 o'clock position, but results will vary depending on your setup. You will also need to find the crossover sweet spot on the subs low pass filter control.

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SMSL AD18 80 Watt x 2 Wireless Bluetooth Amplifier For Speaker

SMSL AD18 80 Watt x 2 Wireless Bluetooth Amplifier For Speaker

Product ID: 159118426

Details

Item dimensions L x W x H
17.2 x 5.1 x
Manufacturer
SMSL
Maximum Supply Voltage
24 Volts
Minimum Supply Voltage
24 Volts
Voltage
220 Volts (AC)

📱Bluetooth aptX + NFC pairing

🔊80W x 2 stereo power

🎛️±8dB bass & treble EQ

Description

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

SLEEK SMART DISPLAY - 1.44-inch adjustable brightness color screen keeps you in control with style and clarity.
TAILOR YOUR SOUNDSCAPE - Precision bass and treble adjustments let you customize audio to match your vibe and space.
VERSATILE MULTI INPUT HUB - Supports USB, coaxial, optical, analog, and headphone outputs for ultimate compatibility.
POWERHOUSE IN A COMPACT FRAME - Delivers crisp 80W x 2 output to energize your passive speakers and subwoofer with room-filling sound.
SEAMLESS WIRELESS CONNECTIVITY - Advanced Bluetooth with aptX and NFC for instant, lag-free streaming from any device.

The SMSL AD18 is a compact yet powerful Class D digital amplifier delivering 80W per channel with versatile inputs including USB, coaxial, optical, analog, and Bluetooth (aptX + NFC). Featuring a 1.44-inch color display with adjustable brightness, independent headphone amp, and ±8dB bass/treble EQ, it offers high-fidelity sound customization in a sleek aluminum chassis. Perfect for professionals seeking premium sound quality and seamless connectivity in a minimalist footprint.

Specifications

ASIN	B071JN7GXN
Best Sellers Rank	#1,372,416 in Electronics ( See Top 100 in Electronics ) #1,873 in Hi-Fi Amplifiers
Brand Name	IS.M.S.LI
Customer Reviews	4.4 4.4 out of 5 stars (888)
Global Trade Identification Number	00790996171746, 06970141852605
Item Dimensions	17.2 x 5.1 x 8.5 Centimeters
Item Weight	590 g
Manufacturer	SMSL Manufacturers
Maximum Output Power	160 watts
Maximum Supply Voltage	24 Volts
Minimum Supply Voltage	24 Volts
Model Number	AD18
Mounting Type	Tabletop
Number of Channels	2
Number of Items	1
Number of Packs	1
Output Power	80 Watts
Part Number	AD18 - Bluetooth
Specification Met	CE, FCC, RoHS
UPC	651312006145 790996171746 619191169320 612032784676
Unit Count	1 Count
Voltage	220 Volts (AC)

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