![]() Other features include one set of RCA analog outputs and an S/PDIF digital out (up to 192 KHz in PCM only). ![]() In addition, the LED will inform the listener when the unit is waiting for a connection, or when the battery is either low or recharging. For example, Green indicates 44/48 kHz, White for DXD 352/384 kHz, Blue for DSD 2.8/3.1 MHz, and so on. There is a small multi-colored LED on top of the chassis, which changes color according to the sampling rate being processed. Two digital filters, selectable via a switch, allow the listener to fine tune, with switch up recommended for listening (Minimum Phase), and switch down recommended for measurement (Standard). Oh, the USB input is the latest and greatest 3.0 version, though USB 2.0 is compatible. Apple camera connection kit (30 pin) or Lightning adaptor cable, and OTG cable for Android devices. One will need the necessary connection kit or cable for use with a smart device, e.g. The iDSD works equally well as a DAC for a smart device, such as an iPhone/iPad or Android, and of course with a laptop/computer. Now iFi-audio has taken the bull by the horns and uped the ante by producing the Nano iDSD, capable of playing all hi-res files: PCM (up to 32 bit/384 kHz), quad DSD (6.2 MHz), and DXD (384 kHz). Geek Out 1000 is capable of playing single and double rate DSD (64/128). However, neither the Herus nor the Loki is powered by a battery like the iDSD, and the Loki requires a host PCM DAC. As far as I know, besides the Nano iDSD, only the Resonessence Labs Herus, Geek Out 1000 and Schiit Loki DSD Companion of the smallest DACs available are DSD capable. There has been a recent onslaught of inexpensive, tiny and portable high-resolution USB DACs on the audio market - spearheaded by the Audioquest Dragonfly - but only a few can play DSD files. The narrative flows better this way because I initially wrote this as one long review. So, for readers who are unaware or have little knowledge of the company up to now, or even for readers who already know about iFi-audio, I suggest reading the first page and the top of page 2 of Part I for company background info and setup/associated equipment before continuing to Parts II and III, or either Part II or III. I realized when I was partitioning this massive review into three parts, that not everyone would read all the parts since, for instance, some may not be interested in a tube buffer/preamp like the iTube discussed in Part I. This is the third and last part of my iFi-audio Micro and Nano components review.
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