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HIDIZS SD2 Review - Felix L P

Feb 27, 2024

By MyftiuRoland

The sound from the Hidizs SD2 slightly enhances the bass and isn't as bad as plugging the headphones directly into the computer

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Comparison
Model	S9 PRO PLUS	S9 PRO
Product Type	Split Style	Split Style
DAC Chip	ESS9038Q2M	ESS9038Q2M
Headphone Jack	3.5mm+4.4mm	3.5mm+2.5mm
Physical Button	2	0
Sampling Rate Indicator Light	6	6
RGB LED Light	×	×
MQA	×	×
PCM 32bit/192kHz	√	√
PCM 32bit/384kHz	√	√
PCM 32bit/768kHz	√	√
DSD 64	√	√
DSD 128	√	√
DSD 256	√	√
DSD 512	√	√
ASIO	√	√
PC Drive	√	√
Switching Filter	√	×
SNR	3.5mm PO:123dB(@32Ω) 4.4mm BAL:120dB(@32Ω)	3.5mm PO:120dB(@32Ω) 2.5mm BAL:119dB(@32Ω)
Channel Separation	3.5mm PO:75dB(@32Ω) 4.4mm BAL:115dB(@32Ω)	3.5mm PO:80dB(@32Ω) 2.5mm BAL:118dB(@32Ω)
THD+N	3.5mm:0.0019%@32Ω 4.4mm:0.0008%@32Ω	3.5mm:0.0006%@32Ω 2.5mm:0.0012%@32Ω
Output Power	3.5mm PO:138mW@32Ω 4.4mm BAL:180mW@32Ω	3.5mm PO:100mW@32Ω 2.5mm BAL:200mW@32Ω
Frequency Response	20Hz-40kHz	20Hz-50kHz
Recommended Earphone Resistance Range		8-300Ω
Headphone with mic	Compatible	Compatible
Transmission interface	Type-C	Type-C
Power System	No need to charge. Plug and play	No need to charge. Plug and play
Shell Material	Aluminum alloy	Aluminum alloy
Color	Black, Silver, Blue	Black, Silver
Dimensions	55×25×11mm	59×18×8mm
Net weight	17g	11g
Supported System	Android, Windows, Mac OS, iPad OS, Harmony OS (Please note: a Lightning to Type-C cable with OTG function has to be purchased separately to support iOS)	Windows, Mac OS, iPad OS, Android, iOS (Please note: For iOS users, the Lightning OTG cable has to be purchased separately)
What's in the box	Hidizs S9 PRO PLUS x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 User manual x 1 Warranty card x 1	Hidizs S9 PRO DAC & AMP x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 Rear clip x 1 User manual x 1 Warranty card x 1

Comparison
Model	S9 PRO PLUS	S9 PRO
Product Type	Split Style	Split Style
DAC Chip	ESS9038Q2M	ESS9038Q2M
Headphone Jack	3.5mm+4.4mm	3.5mm+2.5mm
Physical Button	2	0
RGB LED Light	×	×
MQA	×	×
PCM 32bit/192kHz	√	√
PCM 32bit/384kHz	√	√
PCM 32bit/768kHz	√	√
DSD 64	√	√
DSD 128	√	√
DSD 256	√	√
DSD 512	√	√
ASIO	√	√
PC Drive	√	√
Switching Filter	√	×
SNR	3.5mm PO:123dB(@32Ω) 4.4mm BAL:120dB(@32Ω)	3.5mm PO:120dB(@32Ω) 2.5mm BAL:119dB(@32Ω)
Channel Separation	3.5mm PO:75dB(@32Ω) 4.4mm BAL:115dB(@32Ω)	3.5mm PO:80dB(@32Ω) 2.5mm BAL:118dB(@32Ω)
THD+N	3.5mm:0.0019%@32Ω 4.4mm:0.0008%@32Ω	3.5mm:0.0006%@32Ω 2.5mm:0.0012%@32Ω
Output Power	3.5mm PO:138mW@32Ω 4.4mm BAL:180mW@32Ω	3.5mm PO:100mW@32Ω 2.5mm BAL:200mW@32Ω
Frequency Response	20Hz-40kHz	20Hz-50kHz
Headphone with mic	Compatible	Compatible
Transmission interface	Type-C	Type-C
Power System	No need to charge. Plug and play	No need to charge. Plug and play
Shell Material	Aluminum alloy	Aluminum alloy
Color	Black, Silver, Blue	Black, Silver
Dimensions	55×25×11mm	59×18×8mm
Net weight	17g	11g
Supported System	Android, Windows, Mac OS, iPad OS, Harmony OS (Please note: a Lightning to Type-C cable with OTG function has to be purchased separately to support iOS)	Windows, Mac OS, iPad OS, Android, iOS (Please note: For iOS users, the Lightning OTG cable has to be purchased separately)
What's in the box	Hidizs S9 PRO PLUS x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 User manual x 1 Warranty card x 1	Hidizs S9 PRO DAC & AMP x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 Rear clip x 1 User manual x 1 Warranty card x 1

Comparison
Model	S9 PRO PLUS	S9 PRO
Product Type	Split Style	Split Style
DAC Chip	ESS9038Q2M	ESS9038Q2M
Headphone Jack	3.5mm+4.4mm	3.5mm+2.5mm
Physical Button	2	0
RGB LED Light	×	×
MQA	×	×
PCM 32bit/192kHz	√	√
PCM 32bit/384kHz	√	√
PCM 32bit/768kHz	√	√
DSD 64	√	√
DSD 128	√	√
DSD 256	√	√
DSD 512	√	√
ASIO	√	√
PC Drive	√	√
Switching Filter	√	×
SNR	3.5mm PO:123dB(@32Ω) 4.4mm BAL:120dB(@32Ω)	3.5mm PO:120dB(@32Ω) 2.5mm BAL:119dB(@32Ω)
Channel Separation	3.5mm PO:75dB(@32Ω) 4.4mm BAL:115dB(@32Ω)	3.5mm PO:80dB(@32Ω) 2.5mm BAL:118dB(@32Ω)
THD+N	3.5mm:0.0019%@32Ω 4.4mm:0.0008%@32Ω	3.5mm:0.0006%@32Ω 2.5mm:0.0012%@32Ω
Output Power	3.5mm PO:138mW@32Ω 4.4mm BAL:180mW@32Ω	3.5mm PO:100mW@32Ω 2.5mm BAL:200mW@32Ω
Frequency Response	20Hz-40kHz	20Hz-50kHz
Headphone with mic	Compatible	Compatible
Transmission interface	Type-C	Type-C
Power System	No need to charge. Plug and play	No need to charge. Plug and play
Shell Material	Aluminum alloy	Aluminum alloy
Color	Black, Silver, Blue	Black, Silver
Dimensions	55×25×11mm	59×18×8mm
Net weight	17g	11g
Supported System	Android, Windows, Mac OS, iPad OS, Harmony OS (Please note: a Lightning to Type-C cable with OTG function has to be purchased separately to support iOS)	Windows, Mac OS, iPad OS, Android, iOS (Please note: For iOS users, the Lightning OTG cable has to be purchased separately)
Packing List	Hidizs S9 PRO PLUS x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 User manual x 1 Warranty card x 1	Hidizs S9 PRO DAC & AMP x 1 Type-C to Type-C cable x 1 Type-C to USB-A adapter x 1 Rear clip x 1 User manual x 1 Warranty card x 1

HIDIZS SD2 Review - Felix L P

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