Apogee Electronics Quartet USB Specs

Interface
Max Sample Rate/Resolution192 kHz / 24-Bit
Display and Indicators2 x OLED
Connectivity
Host Connection1 x USB Type-A (MIDI I/O)
1 x Mini-USB (USB 2.0)
Analog I/O4 x Combo XLR / 1/4" Input
6 x 1/4" (6.3 mm) TRS Line Output
1 x 1/4" (6.3 mm) TRS Headphone Output
Phantom Power+48 V (Selectable on Individual Inputs)
Digital I/O1 x BNC / ADAT, S/MUX Input
MIDI I/ONone
Performance
Frequency ResponseA/D Converters:
20 Hz to 20 kHz ±0.2 dB (at 44.1 kHz) 
D/A Converters:
20 Hz to 20 kHz ±0.05 dB (at 44.1 kHz)
Gain RangeMic Inputs:
Up to 75 dB
Max Input LevelA/D Converters:
+20 dBu (+4 dBu) 
+6 dBV (-10 dBV) 
Hi-Z Inputs:
+14 dBu 
Line Inputs:
+20 dBu 
Mic Inputs:
+20 dBu
Max Output LevelD/A Converters:
+20 dBu (+4 dBu) 
+6 dBV (-10 dBv) 
Headphone Outputs:
+19 dBu
Dynamic RangeA/D Converters:
114 dBA 
D/A Converters:
123 dBA
ImpedanceA/D Converters:
5 kOhms 
Line Outputs:
90 Ohms 
Headphone Outputs:
30 Ohms 
Hi-Z Inputs:
>2 MOhms 
Mic Inputs:
3 kOhms
THD+NA/D Converters:
 -106 dB 
D/A Converters:
 -113 dB
EINMic Inputs:
128 dB
Digital Audio
Sample Rates192 kHz (AD/DA Conversion)
Bit Depth24-Bit
Compatibility
OS CompatibilityiOS 7
macOS 10.6.8
macOS 10.7.4 or Later
Windows 10
Processor RequirementMac:
1.5 GHz Intel
RAM Requirements2 GB (4 GB Recommended)
Mobile Device CompatibilityiPod Touch 5th Gen. 
iPhone 5 
iPad 4th Gen. 
iPad Mini
Required HardwareAvailable USB Port
Power
Power RequirementsAC/DC Power Adapter (Included)
AC/DC Power Adapter9 to 16 VDC (Included)
Packaging Info
Package Weight2.25 kg
Box Dimensions (LxWxH)12.4 x 8.4 x 5.7"