ifi Micro iDSD Signature Transportable USB DAC and Headphone Amp User Manual

 Single-ended 6.3mm output

For connecting single-ended 6.3mm headphones. With single-ended 3.5mm headphones, connect with a 3.5mm to 6.3mm adapter.
Tip: With a new pair of IEMs/Headphones, ALWAYS start with the volume no higher than 9 o’clock and with the Power Mode set to ‘Eco’.

Balanced 4.4mm analog output

Connect balanced 4.4mm headphones.
Tip: As the micro iDSD Signature is balanced, we recommend the 4.4mm output.

XBass+®

XBass+® (On/Off ) was uniquely designed to extend bass response to suit different headphones. It is a pure analog signal circuit.

3D+®

The 3D+® (on/off ) recreates a holographic sound field. It is a pure analog signal processing circuit designed for listening to headphones as if one was listening to speakers.  This addresses the ‘music inside the head’ sensation, which makes for unsettling listening.
Tip: Sonically-hindering DSP is NOT used in our XBass+ or 3D+ technologies. They use the highest-quality discrete components and operate purely in the analog domain.  This means all the clarity and resolution of the original music is retained.

Audio Format LED (kHz)

The LED color scheme indicates the audio format and sampling frequency received by the micro iDSD Signature from the music source.

ON/OFF and Analogue Volume Control

The analog volume control in the micro iDSD Signature is superior to any digital volume control.
Warning: Due to the high power of the micro iDSD Signature, always start off at a low volume level so that there is no risk of damage to your headphones or your hearing. iFi audio is not responsible for any hearing or equipment damage from misuse.

Tip: For Apple iOS and Android devices, please use battery power, otherwise you may receive error messages from your device.
Tip: For connection to Apple devices, an Apple Lightning to a USB Camera Adapter is required. For connection to Android devices, a USB On-The-Go (OTG) cable and appropriate OS support are required.
For more information, please refer to www.ifi-audio.com.

S/PDIF 3.5mm Coaxial/Optical input

When USB is not used, connect to a Coaxial/Optical cable (through a Toslink Mini-Plug).
Tip: a Toslink Mini-Plug to Toslink adaptor is included for connecting a Toslink optical cable.
Tip: The S/PDIF standard supports PCM only up to 192kHz.

RCA analog output

This is an analog output.

USB3.0 ‘Type A’ input port

For data transfer only. Connect your phone to the micro iDSD Signature with a Lightning to a USB Camera Adapter (Apple) or USB On-The-Go (OTG) cable (Android).  When using other audio sources, please connect with a USB cable.
Tip: It is preferable to use a USB 3.0 over using a USB 2.0 port on the PC.
Tip: The micro iDSD Signature comes with a pre-installed firmware v5.30 optimized for MQA. This version also handles up to PCM384/DSD256.
Tip: For firmware optimized to run PCM768/DSD5 12(non-MQA) please install firmware v5.20.
Tip: For all downloads: www.ifi-audio.com/downloads/

Power Mode

There are 3 different types of power output levels to drive different headphones from the ultra-sensitive in-ear monitors to the most demanding over-ear headphones.
Approximate listening time (in Battery mode with typical headphones):

Digital Filter

The following are user-selectable:
DSD: Extreme/Extended/ Standard Range (analogue) filters
PCM: Bit-Perfect/Minimum-Phase/Standard (digital) filters
DXD: Bit-Perfect Processing (fixed) analog filter
Tip: For PCM we recommend ‘Bit-Perfect’ for listening and ‘Standard’ for measurements. For DSD, select Extreme/Extended/Standard to find the one that sounds best for listening and ‘Standard Range’ for measurements.

iEMatch® switch

With the iEMatch®, even the most sensitive In-Ear-Monitors (IEMs) can be matched to the micro iDSD Signature.

USB-C (5V) battery charge input

For charging only. Due to the very high-powered nature of the micro iDSD Signature, a full recharge with a standard or high-powered charger would take ~ 12 hours and ~ 3 hours respectively.

LED for Battery Status

*Battery LED will flash when it is charging.
Technologies

• Octa-DSD512/PCM768 and 2X DXD.
• Dual-Core Native DSD/PCM Burr-Brown® chipset.
•  Fully balanced 4.4mm output with (4,100mW).
• Performance boosting Direct-Drive® and Headamp Turbo®.
• Zero Jitter/Femto clock system upgraded for lower phase-noise/jitter.
• Digital engine upgraded with iFi custom ultra-low noise Op-Amp Ov2028
• Analog section upgraded with iFi custom ultra-low noise Op-Amp Ov2627.
• Ultra-low impedance OS-CON polymer capacitors and Panasonic audio grade ECPU film capacitors.
• Performance-tuned 3D+® and XBass+®.
•  Turbo/Normal/Eco modes.

Specifications

Digital Inputs:| USB 3.0 type A “OTG” Socket(USB2.0compatible/ with iPurifier® technology built-in )/ S-PDIF (3.5mm coaxial/optical)
---|---
Output:
Balanced:| 4.4mm
S-E:| 6.3mm/RCA
DAC section|
DAC:| Bit-Perfect DSD & DXD, PCM DAC by Dual-core Burr-Brown
Clock:| Ultra-low jitter GMT Femtosecond Clock
Formats:| DSD512/256/128/64, Octa/Quad/Double/Single-Speed SD DXD (768/705.6/384/352.8kHz),Double/Single- Speed DXD PCM (768/705.6/384/352.8/192/176.4/96/88.2/48/44.1kHz)

MQA

Filters:
DSD| Extreme/Extended/Standard Bandwidth
PCM| Bit-Perfect/Minimum-Phase/Standard
DXD| Bit-Perfect Processing
Line Output
Dynamic Range (Line):| >117db(A)
THD & N (0dBFS Line):| <0.003%
Output Voltage (Line):| >2V
Output Impedance:| <240Ω
Jitter (correlated):| Below AP2 test set limit
Headamp Section Headphone  ower Output Turbo  mode

|
Power (max)
        Power (continuous)| >1,560 mW @ 64 Ohm

166 mW @ 600 Ohm
Normal mode|
Power (max)| 5.5V/1,900 mW
 Power (continuous)

| >100 mW @ 300 Ohm

950 mW @ 32 Ohm
Eco mode
Power (max)| 2.0V/500 mW @ 8 Ohm
 Power (continuous)| >250 mW @ 16 Ohm
Dynamic Range (HP):| >115dB(A) (Eco Mode, 2V Out)
THD &N (HP 500mW/16R)| < 0.008%
Output Voltage (HP):| >10V (Turbo Mode)
Output Impedance:| <1Ω (iEMatch not engaged)
Maximum Output Power:| 4,100 mW @ 16 Ohm Load
Continuous Output Power:| 1,000 mW @ 64 Ohm Load
Battery:| Lithium-polymer 4800mAh
Power System:| Charging via USB-C, BC V1.2 compliant up to1500mA charging current
Dimensions:| 172 x 67 x 27 mm

6.8″ x 2.6″ x 1.1″

Weights:| 295 g (0.65 Ibs)
Warranty period:| 12months

ifi-audio.com
Ver1.0

References

• iFi audio | the Award-Winning Audio Technology Company
• Download Hub | Software and firmware for your iFi audio devices

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