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Following on from the TC44B, TC44C and TC44Pro portable DACs for smartphones, DD HiFi unveils the TC44Pro E2, the fourth generation in its range. It features a male lightning connector and a balanced female 4.4mm jack. It features not one, but two CS43131 DACs for efficient digital/analog conversion of the audio signal, for clear, rich and precise reproduction. The TC44Pro E2 supports high sampling rates up to PCM 32 bit 384kHz and DSD256. The main new feature compared to the TC44Pro is that the TC44Pro E2 also incorporates two ES9603Q headphone drivers. This enables it to deliver more power while maintaining clear, rich sound reproduction.
This HiFi DD product features a Pentaconn-format 4.4mm jack socket with a lead-free soldered connection containing 3% silver for improved conductivity. The upper part is reinforced by a metal ring to protect the connector effectively.


An indicator LED identifies the sampling rate of the file being played. The indicator lights up blue for PCM format and green for DSD format.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Portable DAC | 
| Connectors | 1* Lightning male 1* 4.4mm balanced female jack | 
| DAC chips | 2* CS43131 | 
| Headphone drivers | 2* ES9603Q | 
| Output power | 2x 250mW @ 32 ohm | 
| SNR | >125dB (A-wt) | 
| Dynamic range | > 120dB (A-wt) | 
| THD+N | <0.0004% @ 1kHz | 
| Supported sample rates | PCM 32 bit 384kHz, native DSD up to DSD256 | 
| LED indicator | Blue : PCM Green : DSD | 
| Lightning cable length | 9cm | 
| General | |
|---|---|
| Dimensions | 60 x 20 x 10mm | 
| Weight | 20.7g | 
| Color | Silver | 
| Package | 1x Portable DAC DD TC44PRO E2 | 
| Input | Lightning | 
| Output | Jack 4.4mm | 
| DAC / ADC Chip | CS43131 | 
| Max sampling rate | DSD256 | 
| Max sampling rate | 384kHz | 
| Color | Silver | 
| Networking | No | 
| Remote Control | No |