The SMSL A300 is a stereo Class D power amplifier rated 165W x 2 into 4Ω that can be bridged into one 330W channel, with two RCA inputs, Bluetooth 5.0, a USB input and a subwoofer pre-out. It suits desk and living-room systems with passive speakers, with or without a powered subwoofer.
Who the SMSL A300 is for
Passive speakers: Its Infineon digital amplifier chip is rated 165W x 2 into 4Ω or 85W x 2 into 8Ω, with 0.004% THD+N and 103dB SNR.
One large speaker: BTL mode bridges the A300 into a single 330W channel for 4–8Ω loads, and a BTL-R output passes the right channel on to a second amp.
2.1 systems: A subwoofer pre-out feeds a powered sub, and high-pass mode (50Hz cutoff) takes the deep bass out of the main speakers.
Phone, computer and line sources: It takes Bluetooth 5.0, USB audio from a computer and two RCA line inputs, switched from the front panel or the remote.
Skip it if: you need optical or coaxial inputs or a headphone jack; the A300 has none of them, and SMSL rates its USB input at 48kHz.
SMSL A300 key specs
Amplifier: Infineon MA5332MS digital (Class D) chip; NJRC NJW1194 volume control
Output power, stereo: 165W x 2 (4Ω), 85W x 2 (8Ω)
Output power, BTL: 330W x 1 (4–8Ω)
Inputs: 2 x RCA line, Bluetooth 5.0, USB from a computer (48kHz)
Outputs: Speaker terminals, subwoofer pre-out, BTL right-channel RCA out
Power: Built-in supply, AC 100–240V; 40W at normal volume
Size and weight: 210.5 × 41 × 198mm (W × H × D); 1.3kg; black
Genuine SMSL stock. Free shipping on every order, 45-day returns.
SMSL A300 vs similar options
vs SMSL A200: Adds optical and coaxial digital inputs and costs $10 less; pick the A300 for 165W x 2 into 4Ω and its 330W BTL bridge mode.
vs SMSL AO200 MKII: Adds XLR balanced inputs on the same MA5332MS amp chip for $24 more; pick the A300 to save money when your sources use RCA, USB or Bluetooth.
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.
Choosing a selection results in a full page refresh.
