Fosi Audio Q4 is designed with PC-USB/optical inputs and coaxial and RCA/3.5MM headphone outputs can fit with most home audio system.(Q4 do not support Microphone). RCA output can be connected to amplifier or powered speakers on your desktop; Built-in Hi-Fi headphone amp chip can drive most 16 Ohm to 200 Ohm headphones
Easy to set up, no special software, app, or driver to install, a true plug-and-play digital audio adapter
160mW RMS(32 ohms, 20 Hz - 20 KHz, 0.01% THD), with bass and treble control can be used as preamp or volume controller for your PC/MAC/Computer
Mini Compact D/A converter, stream bit-perfect 24bit/192KHz HD with low jitter, with output protect circuit, safe for your expensive audio system
Come with 5V USB power supply cable, optical cable, USB type B cable and 18-month warranty; Full metallic shell to ensure high quality
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| Q4 | N2 | PH04 | P2 | T20 | DA2120D |
| Type | DAC+Headphone Amp | Portable Headphone Amp | Headphone Amp | Headphone Amp +Preamp | Bluetooth Tube 2.0 CH Amp | Bluetooth DAC 2.1 CH Amp with Remote Control |
| MAX Power Output | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | 330mW@16 Ohm | 40mW@100 Ohm | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | 50W x 2 | 100W x 2 |
| Input | USB + Optical + Coaxial | 3.5mm AUX | 3.5mm AUX | AUX + RCA | Bluetooth + RCA | Bluetooth 5.0 + 3.5mm AUX + PC-USB + Optical + Coaxial |
| Output | RCA + 3.5mm Headphone | 3.5mm AUX | 3.5mm Headphone | 3.5 mm + 6.35 mm | Passive Speakers + Headphone | Passive/Active speakers + Passive Subwoofer + Headphone |
| Treble & Bass Control | | x | x | x | | |
| THD | 0.01% | ≤ 0.005% | - | ≤0.03% | ≤ 0.04% | ≤0.001% |
| SNR | ≥105dB | ≤ 0.005% | - | ≥ 95db | ≥ 98dB | ≥90dB |
| Terminating Impedance | 16-200 Ohm | 16-600 Ohm | 15-150 Ohm | - | 2-8 Ohm | 4-8 Ohm |
| Power Adapter | - | Battery capacity: 2200mA | - | 12V/1.5A | 24V/4.5A | 24V/4.5A |
| Work Voltage | DC 5V | - | DC 12V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |
