Tascam US-4x4HR USB2 Audio Interface

The four-channel US-4x4HR is a member of the Tascam US-HR series of high-resolution USB audio interfaces and an enhanced version of the popular Tascam US-4x4.

It provides four mic/line inputs, two of which can alternatively be used for direct input of a guitar or bass, four balanced line outputs, two headphones connectors, and MIDI I/O to your Windows or Mac computer or your iPhone or iPad*.

This interface is ideal for multitrack recording of two instruments and two vocalists, for instance, or multi-media production with high demands on simple operation and studio-quality sound.

The included loopback function and support for Open Broadcaster Software (OBS Studio), however, makes it also an excellent choice for two-channel podcast creation and live streaming.

Product Features 

• 4 analogue mic/line inputs
• Individual XLR or TRS balanced connectors
• Ultra-low noise -128dB ultra-HDDA mic preamps
• Switchable 48-Volt phantom power on XLR inputs
• 4 audio outputs as well as MIDI interface for Windows, Mac or iOS
• Two headphones outputs delivering 45 mW per channel

Product Specifications 

Audio Resolution

• Sampling frequencies:  44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
• Quantization bit depth:  24-bit

Analogue Inputs

• Mic inputs (balanced):  XLR-3-31 equivalent (1: GND, 2: HOT, 3: COLD)
  • Input impedance:  2.2 kΩ
  • Rated input level:  –7 dBu (0.346 Vrms)
  • Maximum input level:  +9 dBu (2.183 Vrms)
  • Gain range:  56 dB
• Instrument inputs (unbalanced, MIC/LINE INST switch set to INST):  6.3-mm standard TS stereo jacks (Tip: HOT, Sleeve: GND)
  • Input impedance:  ≥1 MΩ
  • Rated input level:  –6 dBV (0.501 Vrms)
  • Maximum input level:  +10 dBV (3.162 Vrms)
  • Gain range:  56 dB
• Line inputs (balanced, MIC/LINE INST switch set to MIC/LINE) :  6.3-mm standard TRS stereo jack (Tip: HOT, Ring: COLD, Sleeve: GND)
  • Input impedance:  10 kΩ
  • Rated input level:  +4 dBu (1.228 Vrms)
  • Maximum input level:  +20 dBu (7.75 Vrms)
  • Gain range:  56 dB

Analogue Outputs

• Line outputs (balanced):  6.3-mm standard TRS stereo jacks (Tip: HOT, Ring: COLD, Sleeve: GND)
  • Output impedance:  210 Ω
  • Rated output level:  +4 dBu (1.228 Vrms)
  • Maximum output level:  +20 dBu (7.746 Vrms)
• Headphone output (PHONES) :  6.3-mm standard stereo jack
  • Maximum output power:  45 mW + 45 mW or higher (THD+N 0.1% or less, into 32 Ω load)

Control Inputs/Outputs

• MIDI IN connector:  5-pin DIN
  • Format:  MIDI standard
• MIDI OUT connector:  5-pin DIN
  • Format:  MIDI standard
• USB:  4-pin USB, Type C
  • Transfer rate:  USB 2.0 High Speed (480 MBit/s)

Audio Performance

• Mic amp EIN (equivalent input noise):  ≤−128 dBu (150 Ω termination, GAIN knob at maximum)
• Frequency response, MIC/LINE input
  • 44.1 kHz / 48 kHz:  20 Hz – 20 kHz, +0 dB/−0.4 dB (JEITA)
  • 88.2 kHz / 96 kHz:  20 Hz – 40 kHz, +0 dB/−0.4 dB (JEITA)
• Frequency response, LINE output
  • 44.1 kHz / 48 kHz:  20 Hz – 20 kHz, +0.2 dB/−0.1 dB (JEITA)
  • 88.2 kHz / 96 kHz:  20 Hz – 40 kHz, +0.2 dB/−0.4 dB (JEITA)
• S/N ratio:  
  • 110 dB (MIC input, GAIN knob at minimum, 20-kHz SPCL LPF, A-weighted)
  • 108 dB (LINE input, GAIN knob at minimum, 20-kHz SPCL LPF, A-weighted)
  • 110 dB (LINE output, LINE OUT knob at maximum, 20-kHz SPCL LPF, A-weighted)
• Distortion (THD+N):  
  • 0.0013 % (MIC IN, 1 kHz sine wave, −5 dBFS input, GAIN knob at minimum, 20 kHz SPCL LPF)
  • 0.0011 % (LINE IN, 1 kHz sine wave, −5 dBFS input, GAIN knob at minimum, 20 kHz SPCL LPF)
  • 0.0012 % (LINE OUT, 1 kHz sine wave, −4 dBFS input, LINE OUT knob at maximum, 20 kHz SPCL LPF)
• Crosstalk attenuation:  
  • ≥95 dB (MIC/LINE input to LINE output, 1 kHz sine wave, GAIN knob at minimum)

Computer System Requirements

• Windows
  • Computer hardware requirements:  Windows computer with a USB 2.0 port
  • CPU/processor speed:  2 GHz or faster dual core processor (x86)
  • Memory:  2 GB or more
  • Supported audio drivers:  ASIO2.0, WDM, MIDI

^{Important: Operation of this unit was confirmed using standard computers that meet the above requirements. This does not guarantee operation with all computers that meet the above requirements. Even computers that meet the same system requirements might have processing capabilities that differ according to their settings and other operating conditions}

• macOS
  • CPU/processor speed:  2 GHz or faster dual core processor
  • Memory:  2 GB or more
  • Supported audio drivers:  Core Audio, Core MIDI
• iOS
  • Supported audio drivers:  Core Audio

^{Important: To connect an iOS device that has a Lightning connector, a genuine Apple Lightning to USB Camera Adapter (sold separately) is necessary.}

Power Supply and Other Specifications

• Power Supply
  • When used with a computer:  USB bus power or dedicated AC adapter below
  • When used with an iOS device:  Dedicated AC adapter (Tascam PS-P1220E, DC 12 V)
• Power consumption:  2.25 W
• External dimensions (W × H × D, including protrusions):  296 mm × 65 mm × 160 mm
• Weight:  1.6 kg
• Operating temperature range:  5–35 °C

Manufacturer: Tascam