iFi audio Go Bar Ultraportable DAC Headphone Amp Instruction Manual

June 11, 2024
iFi Audio

Go Bar Ultraportable DAC Headphone Amp
Instruction Manual

Go Bar Ultraportable DAC Headphone Amp

Thank you for purchasing the bar from the GO series. The bar is a balanced USB audio DAC amplifier.
Audio format, frequency and sound effects LED
The LED colour scheme indicates the current sampling frequency and audio format received by the GO bar from the music source. Sound effect modes are also indicated.

LED Mode
White 44.1/48kHz
White 88.2/96kHz
White 176.4/192kHz
White 352.8/384kHz
White DSD 64/128
White DSD 256

Sound effects

LED Status
Blue XSpace
Orange XBass

Tip: Sonically-hindering DSP is NOT used for XBass+ nor XSpace systems. They use the highest-quality discrete components and operate purely in the analogue domain. Hence all the clarity and resolution of the original music is retained.

 MQA and Digital filter LED

MQA:

Green| MQA
Blue| MQA Studio
Magenta MQB| Original Sample Rate

Digital Filter for PCM Playback:

LED Mode
Cyan BP
White GTO
Red STD
Yellow MIN
Off DSD playback

iFi audio Go Bar Ultraportable DAC Headphone Amp - MQA and Digital filter
LED

iEMatch switch

With the iEMatch, even the most sensitive In-Ear-Monitors (IEMs) can be matched to the GO bar.
iEMatch

3.5 = 3.5mm headphones
off = off
4.4 =  4.4mm headphone

Tip: The Go bar and the earphone will not be damaged if iEMatch is adjusted incorrectly, but the attenuation level will not be correct.

Volume control and gain
The increase or decrease of the volume is synchronised with the volume of the mobile phone/computer.
Press the + and – volume buttons together for ≥ 2s to switch to turbo mode (volume +6dB). Turbo mode is indicated by 6 LEDs lighting up at the same time for 1s. Normal mode is indicated by only the top 2 LEDs lighting up for 1s.

Settings and Digital filter mode

This button cycles between (Please refer to item 1): Off > XSpace > XBass > XSpace + XBass (short click)+ Digital filter (long press ≥2s)
Digital filter
To enter filter selection mode, press and hold the button for ≥2s, the MQA LED will flash, then press the volume +- buttons (4) to select the filter, a short press on the set button (5) will select and exit the filter mode, see item (2) for the LED colour of the digital filter mode.
The following 4 digital filters are available:

‘BP’ (Cyan) Bit-Perfect: no digital filtering, no pre or post  ringing
‘STD’ (Red) Standard, modest filtering, modest pre and  post ringing
‘MIN’ (Yellow) Minimum phase, slow roll-off, minimum pre  and post ringing
GTO’ (White) Gibbs Transient-Optimized: upsampled to  352/384kHz, minimum

filtering, no preringing, minimum post ringing

S-Balanced 3.5mm headphone output
For connecting 3.5mm headphones.

Balanced 4.4mm headphone output

For connecting balanced 4.4mm headphones.

USB-C input

The USB-C socket plays up to 32-bit 384kHz, has full MQA decoding, and native DSD up to DSD256.
Tip: When the phone battery is low ( 30%), the Go bar on older iPhones (6S or before) may < not be able to operate.

Specications

input: USB-C
Formats:
PCM 44.1/48/88.2/96/176.4/192/352.8/384kHz
DSD 2.8/3.1/5.6/6.1/11.3/12.3MHz
DXD 352.8/384kHz
MQA Full Decoder
DAC: Bit-Perfect DSD & DXD DAC by Cirrus Logic

Headphone Outputs:

Balanced: 4.4mm
UnBAL: 3.5mm

Power Output:

Balanced: 475mW@32Ω; 7.2V@600Ω
UnBAL: 300mW@32Ω; 3.8V@600Ω

*Output Impedance:
**

Balanced: 475mW@32Ω; 7.2V@600Ω
UnBAL: 300mW@32Ω; 3.8V@600Ω

SNR:

Balanced: <1Ω
UnBAL: <1Ω

DNR:

Balanced: 132dBA
UnBAL: 108dBA

THD + N:

Balanced: 109dB(A)
UnBAL: 108dB(A)
Balanced: <0.002% (6.5mW/2.0V @ 600Ω)
--- ---
UnBAL: <0.09% (100mW/1.27V @ 16Ω)
Frequency Response: 20Hz – 45kHz (-3dB)
Power: <4W max.
Dimensions: 65 x 22 x 13.2 mm (2.6″ x 0.9″ x 0.5”)
Net weight: 28.5g (1.0 oz)
Warranty period:  12 months
  • With iWatch engaged: <3.6Ω
  • Speciation are subject to change without notice.

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References

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