Universal Audio Apollo Twin X Quad Heritage Edition

SYSTEM
I/O Complement
Microphone Inputs: Two
High Impedance (Hi-Z) Instrument Inputs: One
Analog Line Inputs: Two
Analog Line Outputs (DC coupled): Two (four including Monitor outputs)
Analog Monitor Outputs (DC coupled): Two (one stereo pair)
Headphone Output: One stereo
Digital Input One (ADAT or S/PDIF, selectable)
Thunderbolt 3 Port: One

A/D – D/A Conversion
Simultaneous A/D conversion: Two channels
Simultaneous D/A conversion: Six channels
Supported Sample Rates (kHz): 44.1, 48, 88.2, 96, 176.4, 192
Bit Depth Per Sample: 24
Analog Round-Trip Latency: 1.1 milliseconds @ 96 kHz sample rate
Analog Round-Trip Latency through four UA legacy plug-ins (included) via Console software: 1.1 milliseconds @ 96 kHz sample rate (no additional latency via Realtime UAD Processing)

ANALOG I/O
Microphone Inputs 1 & 2
Frequency Response: 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range: 123 dB (A–weighted)
Total Harmonic Distortion + Noise: -115 dB (1 kHz @ -1 dBFS)
Maximum Input Level (PAD on): 25.6 dBu
Default Input Impedance: 5.4K Ohms (variable via Unison plug-ins)
Gain Range: +10 dB to +65 dB
Pad Attenuation (switchable per input): 20 dB (variable via Unison plug-ins)
Phantom Power: +48V (switchable per mic input)
Connector Type: XLR Female, pin 2 positive (Combo XLR/TRS)

Hi-Z Input
Frequency Response: 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range: 121 dB (A–weighted)
Total Harmonic Distortion + Noise: -108 dB (1 kHz @ -1 dBFS)
Maximum Input Level (at minimum gain): 12.2 dBu
Default Input Impedance: 1M Ohms (variable via Unison plug-ins)
Gain Range: +10 dB to +65 dB
Connector Type: ¼” Female TS Unbalanced

Line Inputs 1 & 2
Frequency Response: 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range: 122 dB (A–weighted)
Total Harmonic Distortion + Noise: -114 dB (1 kHz @ -1 dBFS)
Maximum Input Level (at minimum gain): 20.2 dBu
Input Impedance: 10K Ohms
Gain Range: +10 dB to +65 dB
Connector Type: ¼” Female TRS Balanced

Line Outputs 1 & 2
Frequency Response: 20 Hz – 20 kHz, ±0.05 dB
Dynamic Range: 126 dB (A–weighted)
Total Harmonic Distortion + Noise: -117 dB (1 kHz @ -1 dBFS)
Maximum Output Level: 20.2 dBu
Output Impedance: 100 Ohms
Connector Type: ¼” Female TRS Balanced

Monitor Outputs L & R
Frequency Response: 20 Hz – 20 kHz, ±0.1 dB
Dynamic Range: 127 dB (A–weighted)
Total Harmonic Distortion + Noise: -117 dB
Maximum Output Level: 20.2 dBu
Output Impedance: 100 Ohms
Connector Type: ¼” Female TRS Balanced

Stereo Headphone Output
Frequency Response: 20 Hz – 20 kHz, ±0.1 dB
Dynamic Range: 124 dB (A–weighted)
Total Harmonic Distortion + Noise: -98 dB (1 kHz @ -1 dBFS)
Maximum Output Power (into 300 ohm load): 96 mW RMS
Connector Type: ¼” Female TRS Stereo

DIGITAL INPUT
Connector Type: Optical TOSLINK JIS F05
- S/PDIF
Format: IEC 958
Supported Sample Rates (kHz): 44.1, 48, 88.2, 96
Input Channels Two (Stereo L/R)
- ADAT
Format: ADAT Digital Lightpipe with S/MUX
Supported Sample Rates (kHz): 44.1, 48, 88.2, 96, 176.4, 192
ADAT Input Channels @ 44.1 kHz, 48 kHz: Channels 1 – 8
ADAT Input Channels @ 88.2 kHz, 96 kHz: Channels 1 – 4
ADAT Input Channels @ 176.4 kHz, 192 kHz: Channels 1 – 2

Clock Synchronization Sources
Internal, ADAT, S/PDIF: Conditional per selected digital input type

ELECTRICAL
Power Supply: External AC-to-DC Power Supply, Level VI compliant
AC Input Connector Type: IEC C8, non-polarized
AC Requirements: 100V – 240V AC, 50 – 60 Hz
DC Connector Type: Male plug, 2.1 mm x 5.5 mm, center positive
DC Requirements: 12 VDC, ±5%
Maximum Power Consumption: 15 Watts (when portable host computer not charging)

ENVIRONMENTAL
Ambient Temperature Range: 32º to 104º F (0º to 40º C)

MECHANICAL
Dimensions
Width: 6.31” (16.03 cm)
Height: 2.60” (6.6 cm)
Depth, Chassis Only: 5.86” (14.88 cm)
Depth, Including Knob & Jack Protrusions: 6.20” (15.75 cm)
Shipping Box (Length x Width x Height): 8” x 8” x 5.5” (20.32 cm x 20.32 cm x 13.97 cm)
Weight (bare unit): 2.35 pounds (1.07 kg)