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Sonifex RB-ADDA vs. Fiio K3 + 2
Tone/balance controller
Bass control
Wireless connection
None
None
High resolution audio formats
DSD
DSD
Analogue 3.5mm input (Aux)
0 ​
Analogue RCA stereo inputs
0 pair
Analogue RCA stereo outputs
0 pair
Balanced input (analogue) XLR
0 pair
Balanced input digital XLR (AES / EBU)
0 ​
Balanced output (analogue) XLR
0 pair
Balanced output 4.4mm Pentaconn
Balanced output digital XLR (AES / EBU)
0 ​
Digital coaxial input (S/PDIF)
1 ​
Digital coaxial output (S/PDIF)
1 ​
0 ​
Digital optical input (S/PDIF)
1 ​
Digital optical output (S/PDIF)
1 ​
0 ​
Firewire
No
No
Headphone output
Yes
Yes
Yes
Headphone output (3.5 mm)
2 ​
Headphone output (Jack plug 6.3 mm/1/4
0 ​
Output power per channel
720 mW
Pre output (full range)
No
Tele plug 6.3mm input
0 ​
USB
Yes
Yes
Type of USB connector
USB (Type C)
USB powered (only via USB)
Yes
Available colours
Black
Black, White, Silver
Black, Silver
Dimensions (WxHxD)
Depth
58 mm
60 mm
Height
22 mm
Width
70 mm
82 mm
Product weight
1.6 kg
0.82 kg
0.18 kg
Features
Suitable for PA use/Rack mount
Volume control
Display, Volume control
Built-in D/A converter
Yes
Yes
No
D/A audio
32 bit / 768 kHz
DAC (audio chip)
AKM AK4452
Can be used as a preamplifier (Preamp)
Yes
Yes
Release year
2011
2015
Battery operated
No
Yes
Separate power connector (mains)
No