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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AD18 Audio HiFi Stereo Amplifier with Bluetooth 4.2 Supports Apt-X,USB DSP Full Digital Power Amplifier 2.1 Small 80Wx2 Class D Amplifier with Subwoofer Output

Product ID: 56513326

Details

Item dimensions L x W x H
6.77 x 2.01 x
Manufacturer
SMSL
Maximum Supply Voltage
24 Volts
Mounting Type
Coaxial Plug
Voltage
220 Volts (AC)

📶Bluetooth 4.2 with apt-X & NFC pairing

🔊80W x 2 powerful stereo output

🎚️6 digital & analog inputs + DSP EQ

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Description

🎧 Elevate your sound game — power, precision, and wireless freedom in one sleek amp!

UNMATCHED CONNECTIVITY - Six versatile inputs including USB, coaxial, optical, analog, and Bluetooth 4.2 with apt-X for seamless multi-device integration.
COMPACT STYLISH DESIGN - Sleek, space-saving chassis with a clear display and remote control—perfect for modern desks and living spaces craving premium audio.
DUAL INDEPENDENT CIRCUITS - Separate headphone and speaker amps ensure pristine audio quality whether you’re rocking headphones or filling the room.
CUSTOMIZABLE SOUND EXPERIENCE - Built-in digital equalizer with bass, treble controls, and SMSL’s patented SDB sound enhancement for dynamic, immersive listening.
POWERFUL CLASS D AMPLIFICATION - Delivers a robust 80 watts per channel at 4 ohms, driving bookshelf speakers and subwoofers with crystal-clear, distortion-free sound.

The S.M.S.L AD18 is a compact, full digital Class D stereo amplifier delivering 80W per channel with six input options including USB, coaxial, optical, analog, and Bluetooth 4.2 with apt-X and NFC. Featuring dual independent circuits for speakers and headphones, a subwoofer output, and a versatile DSP equalizer with patented sound enhancement, it offers audiophile-grade sound quality and connectivity in a stylish, space-efficient design ideal for desktop or home audio setups.

Specifications

ASIN	B071JN7GXN
Best Sellers Rank	#130,287 in Electronics ( See Top 100 in Electronics ) #822 in Audio Component Amplifiers
Brand Name	S.M.S.L
Customer Reviews	4.3 4.3 out of 5 stars (985)
Global Trade Identification Number	00790996171746, 06970141852605
Included Components	amplifier
Item Dimensions	6.77 x 2.01 x 3.35 inches
Item Weight	1.3 Pounds
Manufacturer	SMSL
Maximum Supply Voltage	24 Volts
Model	AD18
Mounting Type	Coaxial,Plug Mount
Number of Channels	2
Output Power	80 Watts
Package Type Name	box
Part Number	AD18 - Bluetooth
Specification Met	CE, FCC
UPC	651312006145 790996171746 619191169320 612032784676
Unit Count	1.0 Count
Voltage	220 Volts (AC)
Warranty Description	1 year

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