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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S.M.S.L AD18 مضخم صوت هاي فاي ستيريو مع بلوتوث 4.2 يدعم Apt-X، USB DSP مضخم طاقة رقمي كامل 2.1 مضخم صوت صغير 80Wx2 فئة D مع مخرج مضخم صوت

Product ID: 257769623

Details

Item dimensions L x W x H
17.2 x 5.1 x
Manufacturer
S.M.S.L
Maximum supply voltage
24 Volts
Minimum supply voltage
4.8 Volts
Voltage
220 Volts (AC)

📶Bluetooth 4.2 with apt-X & NFC pairing

🔊80W x 2 stereo power output

🎚️±8dB bass & treble digital EQ

S$335

Duties & taxes included

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Description

🎧 Elevate your sound game — compact power meets wireless freedom!

TAILOR YOUR SOUNDSCAPE - Advanced DSP with patented SDB tech and ±8dB bass & treble controls for a personalized audio experience.
VERSATILE MULTI INPUT HUB - Six input options including USB, coaxial, optical, analog, and Bluetooth to connect all your favorite sources.
DUAL INDEPENDENT AMPLIFIERS - Separate circuits for speakers and headphones guarantee pristine sound quality without compromise.
POWERHOUSE IN A COMPACT FRAME - Delivers crisp 80W x 2 stereo output in a sleek aluminum chassis, perfect for your desktop or living room setup.
SEAMLESS WIRELESS CONNECTIVITY - Bluetooth 4.2 with apt-X and NFC ensures effortless, high-fidelity streaming from all your smart devices.

The S.M.S.L AD18 is a full digital Class D stereo amplifier delivering 80W per channel with advanced DSP and patented SDB sound enhancement. Featuring Bluetooth 4.2 with apt-X and NFC for seamless wireless streaming, it supports six input types including USB, coaxial, and optical. Its dual independent amplifier circuits provide dedicated outputs for speakers and headphones, while ±8dB bass and treble EQ adjustments let you customize your audio. Encased in a sleek aluminum housing, the AD18 is a compact powerhouse designed for audiophiles seeking high-fidelity sound in a versatile, stylish package.

Specifications

ASIN	B071JN7GXN
Brand Name	IS.M.S.LI
Customer Reviews	4.4 4.4 out of 5 stars (887)
Global Trade Identification Number	00790996171746, 06970141852605
Item Dimensions	17.2 x 5.1 x 8.5 centimeters
Item Type Name	SMSL AD18 HIFI Audio Stereo Power Amplifier with Bluetooth Subwoofer Output
Item Weight	1.3 Pounds
Manufacturer	S.M.S.L
Material Type	Aluminum
Maximum Output Power	80 watts
Maximum Supply Voltage	24 Volts
Minimum Supply Voltage	4.8 Volts
Model	AD18
Mounting Type	Floor Standing
Number of Channels	2
Number of Items	1
Operating Temperature	15 Degrees Celsius
Output Power	80 Watts
Package Type Name	Cardboard
Part Number	AD18 - Bluetooth
Specification Met	CE, FCC
UPC	651312006145 790996171746 619191169320 612032784676
Voltage	220 Volts (AC)

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