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iFi micro iDSD Signature DAC/Headphone Amplifier

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Based around two Burr-Brown DAC chips in a custom ‘interleaved’ configuration, the digital engine has four pairs of differential signals – two pairs per channel. This means

  • a lower noise floor
  • improved channel separation
  • finer musical detail and micro-dynamics

The micro iDSD Signature handles up to PCM 768, DSD 512, 2xDXD and MQA. All this is done natively. Both PCM and DSD remain ‘bit-perfect’.

Precision personified

Extensive jitter-eradication technologies are applied to the digital engine, including iFi’s GMT (Global Master Timing) femto-precision clock and the intelligent memory buffer.

The micro iDSD Signature also comes with iFi’s GTO (Gibbs Transient Optimized) digital filter installed. And exclusive firmware available on our website means you can change digital filters as you wish.

Circuit training

With up to 4100mW of power the micro iDSD Signature can drive all manner of headphones with aplomb, from highly sensitive in-ear monitors to current hungry planar headphones.

The signal path has been refined to maximise sonic texture. High spec components featuring class-leading qualities such as low ESR (Equivalent Series Resistance), high stability and low distortion mean top-notch sound quality and maximum musical enjoyment.

Add in the direct-coupled nature of the circuit – no coupling capacitor is present – and the micro iDSD Signature definitely runs rings around the competition.

Versatile sonic tailoring

One size no longer fits all when it comes to quality listening.

The digital stage of the micro iDSD Signature features a variety of filter settings:

  • ‘Standard’, ‘Minimum Phase’ and ‘Bit-Perfect’ for PCM files
  • ‘Standard Bandwidth’, ‘Extended Bandwidth’ and ‘Extreme Bandwidth’ for DSD

The amp stage also has three settings to adjust power and gain. As well as ‘Normal’, you get

  • ‘Turbo’  to ramp up the level of drive for current-hungry headphones
  • ‘Eco’ to dial down the power to suit high-sensitivity in-ear monitors and/or to extend battery life

Complete this with our iEMatch technology that adjusts output level and our XBass+ and 3D+ signature sonic tweaks, and the micro iDSD Signature is flexible to the max.

Get connected

The micro iDSD Signature features two digital audio inputs – USB Type-A and an S/PDIF socket that accepts both electrical, via a 3.5mm connector, and optical signals – adapter supplied.

It also houses a pair of RCA analogue outputs to connect to a pair of powered speakers or a power amp and passive speakers, to act as a DAC and preamplifier.

There is a 6.3mm output for headphones that have a standard single-ended connector (headphones with a 3.5mm jack can be connected using an adapter) and a 4.4mm Pentaconn output for headphones offering balanced connection.

Both headphone outputs utilise our ‘S-Balanced’ output circuitry. This delivers the sonic benefits of balanced connections with all headphone/earphone types – even those with single-ended connectors – cutting crosstalk and associated distortion in half.

Headphone Amplifier Output Power: 4,100mW

Specs:

In/Out

Digital Inputs USB 3.0 type A “OTG” Socket (USB2.0 compatible/with iPurifier® technology built-in)
S/PDIF (3.5m coaxial/optical)
Output Balanced: 4.4mm
SE: 6.3mm/RCA

DAC

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 DSD,
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

Headphone Power Output

Turbo Mode Power (max) 10.0V/4,100 mW
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

Spec

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"
Weight 295 g (0.65 Ibs)

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