The SMSL AO300 PRO is an all-in-one amp/DAC that pairs a Cirrus Logic CS43131 DAC with an Infineon Class D speaker amp rated 165W x 2 into 4Ω, and takes HDMI eARC, USB, optical, coaxial, RCA and LDAC Bluetooth sources. It's for desk or TV systems running passive speakers, a subwoofer and headphones from one remote.
Who the SMSL AO300 PRO is for
TV sound through passive speakers: HDMI eARC carries the TV's audio (set the TV to PCM stereo), and with CEC switched on the TV remote also handles volume and power.
Bookshelf speakers at a desk: SMSL rates it at 165W x 2 into 4Ω and 85W x 2 into 8Ω, plenty for passive bookshelf speakers at nearfield or small-room distances, and the subwoofer output makes it a 2.1 system.
Computer, phone and disc sources: USB handles PCM up to 768kHz/32-bit, DSD256 and MQA, Bluetooth receives LDAC, aptX HD, aptX, AAC and SBC, and optical and coaxial take up to 192kHz/24-bit.
Turntable owners: The RCA line input (280mV, 22kΩ) takes a turntable once a phono stage, built in or external, sits between them.
Tone tweakers: Bass and treble adjust by ±9dB, alongside EQ presets and five DAC filters, one of them non-oversampling.
Skip it if: you need surround decoding, a stereo pre-out for powered speakers or a rated headphone amp: it is a two-channel (2.1) design whose outputs are speaker terminals, a subwoofer out and two headphone jacks, and SMSL's spec sheet gives no headphone power figure.
SMSL AO300 PRO key specs
DAC chip: Cirrus Logic CS43131 (XMOS XU-316 USB)
Amplifier: Infineon MA5332MS Class D
Output power: 165W x 2 @ 4Ω; 85W x 2 @ 8Ω
THD+N / SNR: 0.003% / 107dB
Inputs: HDMI eARC (CEC), USB, optical, coaxial, RCA line, Bluetooth
Size and weight: 219 × 42 × 185mm; 1.5kg (3.3lb); built-in power supply
Genuine SMSL stock. Free shipping on every order, 45-day returns.
SMSL AO300 PRO vs similar options
vs FiiO K13 R2R: No speaker amp, but rated 2,400mW per channel at 32Ω balanced for headphones, with XLR and RCA preamp outputs for powered speakers; choose the AO300 PRO for passive speakers and HDMI eARC.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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