PORTABLE · CS43131 × 2

Snowsky RETRO NANO

A portable DAC and headphone amplifier with two CS43131 DAC chips, a 3.5 mm and a 4.4 mm balanced output, a built-in mic and a 10-band EQ in Contour. About 28.3 g.

Manufacturer page

POWER AT 32 Ω220mW4.4 mm balanced

OUTPUT IMPEDANCE<0.3Ω3.5 mm; 4.4 mm <0.3 Ω

SNR≥128dBA-weighted, UAC decoding

PRICENo price yet

OUTPUTS3.5 mm · 4.4 mm balanced

DAC CHIPCS43131 × 2

PARAMETRIC EQ10 bandspeak, shelves, low and high pass

Works with Contour

Numbers are the manufacturer's stated figures unless marked as measured; sources linked below.

Outputs and power

4.4 mm balanced

130mWat 16 Ω per channel

Spec sheet: 130 mW, THD+N <1%, L+R≥130mW+130mW, UAC decoding

220mWat 32 Ω per channel

Spec sheet: 220 mW, THD+N <1%, L+R≥220mW+220mW, UAC decoding

55mWat 300 Ω per channel

Spec sheet: 55 mW, THD+N <1%, L+R≥55mW+55mW, UAC decoding

Output impedance <0.3 Ω

3.5 mm

120mWat 16 Ω per channel

Spec sheet: 120 mW, THD+N <1%, L+R≥120mW+120mW, UAC decoding

100mWat 32 Ω per channel

Spec sheet: 100 mW, THD+N <1%, L+R≥100mW+100mW, UAC decoding

10mWat 300 Ω per channel

Spec sheet: 10 mW, THD+N <1%, L+R≥10mW 10mW, UAC decoding

Output impedance <0.3 Ω

SNR≥125 dB (3.5 mm), ≥128 dB

THD+N<0.0018%

Crosstalk≥75 dB (3.5 mm), ≥124 dB (4.4 mm balanced)

Frequency response20 Hz~40 kHz: attenuation＜3 dB; 20 Hz~20 kHz: attenuation＜0.1 dB

Not stated: supply voltage.

Is it enough for your headphones?

Snowsky rates the RETRO NANO at 220 mW into 32 Ω from the 4.4 mm balanced output. Below is how much of that is left to spare for each kind of headphones when you listen loud, with peaks at 110 dB. A figure marked est. is worked out from that rating.

Sensitive IEMsMulti-driver sets that hiss on strong sources

needs 0.6 mW130 mW at 16 Ω+23 dB

Most IEMsTypical in-ears, 16 to 50 Ω

needs 3.2 mW220 mW at 32 Ω+18 dB

Easy-to-drive headphonesClosed and portable, 32 Ω

needs 16 mW220 mW at 32 Ω+11 dB

Hard-to-drive headphones300 Ω, HD 600 class, hungry for voltage

needs 20 mW55 mW at 300 Ω+4 dB

Most planarsPlanar magnetic, low impedance, need current

needs 50 mW220 mW at 32 Ω+6 dB

Demanding planarsThe hardest loads, desktop territory

needs 251 mWest. 149 mW at 60 Ω2 dB short

The device

From Snowsky's spec sheet unless marked

InputUSB-C, Bluetooth 5.1

FormatsPCM up to 96 kHz/16-bit

DAC chipCS43131 × 2

Volume60 levels on the device, separate from the phone volume; physical buttonsfiio.com

AppFiiO control works in both BT mode and USB decoding modeFiiO FAQ 11: control in FiiO Control

MicSupports Bluetooth voice calls, built-in omnidirectional microphone; supports in-line control for CTIA mic

BuildBlue/White

Parametric EQ10 bands: peak, low shelf, high shelf, low pass and high pass, ±12 dB, Q 0.25 to 8Works with ContourFiiO FAQ 17: PEQ for RETRO NANO

SizeAbout 55.1 × 37.5 × 13.7 mm

WeightAbout 28.3 g

The parameters page, the product page Basic specifications and FAQ item 16 say CS43131*2; one product page paragraph says 'two DAC chips ES9068AS'. The same page carries a note about the JM21's 3GB RAM, so that block looks copied from other products. Catalog shows CS43131 × 2.

The product page shows a banner 'Asynchronous USB DAC Supports 384 kHz/32-bit'; the parameters table, the Basic specifications ('Driver-free up to PCM 96k') and FAQ items 8 and 16 say 96 kHz/16-bit (UAC1.0). Catalog shows 96 kHz/16-bit.

Devices with the same DAC chip

CS43131 · 26 devices use it

JCALLYJM30L31.25 mW$26.9931.25 mW · $26.99

JCALLYJM3031.25 mW~$2731.25 mW · ~$27

FiiOKA11200 mWNoSGM8262$29.99200 mW · $29.99PEQ No · Amp SGM8262

JCALLYJM20MAX195 mWSGM8262$29.99195 mW · $29.99Amp SGM8262

TRNWorks with ContourBlack Pearl320 mWWorks with Contour10 bands$31.44320 mW · $31.44PEQ Yes, 10 bands

JCALLYJM2031.25 mW~$31.6431.25 mW · ~$31.64

FiiOKA2≥153 mWNo$34.59≥153 mW · $34.59PEQ No

JCALLYJM20 PRO31.25 mWYes8 bands~$35.4631.25 mW · ~$35.46PEQ Yes, 8 bands

TANCHJIMSPACE LITE98 mW$39.9998 mW · $39.99

SnowskyWorks with ContourMelody>250 mW0.736 ΩMeasuredWorks with Contour10 bands$39.99>250 mW · 0.736 Ω · $39.99PEQ Yes, 10 bands

JCALLYJM30PRO31.25 mW~$46.4931.25 mW · ~$46.49

JCALLYSP3031.25 mW~$54.6131.25 mW · ~$54.61

TANCHJIMWorks with ContourSPACE IIWorks with Contour10 bandsPEQ Yes, 10 bands

All 26 in the finder

More like this

More portable DAC amps

PEQ on Android: Contour EQ supports this dongle

Contour EQ is a free, open-source Android app that reads and writes the PEQ stored inside the SnowSky RETRO NANO.

SnowSky RETRO NANO EQ app for Android

Sources

Checked 14 Nov 2026

FiiO product page: RETRO NANO

fiio.com · the product page

Used for power, output impedance, noise and distortion, the DAC chip, input, parametric EQ and brand

FiiO RETRO NANO parameters

fiio.com · the spec sheet

Used for power, output impedance, output voltage, noise and distortion, frequency response, formats, the DAC chip, input, outputs, controls, the app, microphone, size, weight, build, bluetooth, gain, battery and display

FiiO RETRO NANO FAQ index

fiio.com

FiiO FAQ 11: control in FiiO Control

fiio.com

Used for the app

FiiO FAQ 17: PEQ for RETRO NANO

fiio.com

Used for parametric EQ

FiiO FAQ 16: hardware and decoding

fiio.com

Used for formats and the DAC chip

FiiO FAQ 8: USB DAC in PC mode

fiio.com

Used for formats and usb audio class