Nobsound HiFi Tube Bluetooth Amplifier: Receiver with Optical/Coaxial & Flash-Drive Player, PRE-Out 2.1, 3.5mm Headphone, 6J1 Valve Preamp, Desktop Audio for Audiophiles

Parameters Brand: Nobsound Model: DA3 Audio input: Bluetooth / Stereo RCA / Coaxial / Optical / U-disk Audio output: Banana speaker jacks / Stereo RCA / 3.5mm headphone jack Tube model: 2 × 6J1 Rated output impedance: 4Ω Rated output power: 35W×2 @ 4Ω / 25W×2 @ 8Ω Frequency response: 60Hz–20KHz (±3dB) SNR: 70dB THD: 1% RCA input sensitivity: 500mV Max storage of U-disk: 128G Supported formats of U-disk: FLAC / APE / MP2 / MP3 / WMA / AAC / MP4 / M4A / WAV Input voltage: AC 110V / 220V IN Dimensions (W*D*H): 170*259*147mm / 6.69*10.20*5.79in Net weight: 3kg / 6.61lb Package weight: 3.5kg / 7.72lb Packing list * 1 × Tube Amplifier * 1 × Bluetooth Antenna

• Tube Amplifier — Dual 6J1 preamp stage adds smooth, natural warmth and detail; rated 35W×2 @4Ω / 25W×2 @8Ω to drive common bookshelf speakers, with discrete circuit, four 2200µF caps and a 90W transformer for clean power.
• Bluetooth Receiver — Fast, stable wireless pairing from phones, tablets, and laptops; one-touch input switching and clear status indicator make hopping between wireless and wired sources effortless.
• Optical/Coaxial — TV/console-friendly SPDIF inputs bypass noisy analog outs for clearer dialog and music; ideal for upgrading flat-panel audio without extra DACs or complicated wiring.
• Flash-Drive Player — Direct playback from USB drives up to 128G; supports FLAC/APE/WAV and more so you can enjoy bit-perfect local files without a computer.
• PRE-OUT 2.1 — Dedicated pre-out makes adding an active sub simple; blend low-end weight with your L/R speakers and fine-tune using independent bass/treble knobs for room-matched balance.