| Composition | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Tuner | has a digital | has a digital |
| Cassette deck | | yes |
| CD players | yes | yes |
| MP3-players | no | no |
| Blu-ray player | no | no |
| Amplifier | yes | yes |
| Equalizer | yes | yes |
| Navigator | no | no |
| General characteristics | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Maximum power | 4x45 W | |
| Nominal and maximum power | | 4x22 W/4x47 W |
| Management changer | | CD |
| CD-changer interface is | no | custom |
| Supported carriers and formats | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Formats | CD-Audio | CD-Audio |
| Media | | cassette |
| Display | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Display type | multicolor | multicolor |
| Adjust backlight brightness | | yes, automatic |
| Cassette deck | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Auto tape | | yes |
| Noise reduction | | DolbyB |
| Auto reverse | | yes |
| To search for music on cassette | | yes |
| Skip pause on the tape | | yes |
| Management | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Multicolor lighting | yes | yes |
| Infrared remote | no | yes |
| Joystick on the steering wheel | no | no |
| Pause when speaking on the phone | yes | yes |
| Memory disk names | | yes |
| Interfaces | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Outputs | audio | audio |
| Connecting the ISO | | yes |
| Gold-plated connectors | yes | yes |
| Protection | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Detachable panel | yes | yes |
| Tuner | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Dynamic range | 93 dB | |
| Support band | FM, KW, MW, LW | FM, MW, LW |
| RDS | RDS | RDS |
| Additional information | KENWOOD KDC-2021SA | KENWOOD DPX-4020 |
| Signal/noise ratio | 96 dB | |
| Crosstalk | 85 dB | |
| Super-bass | | yes |
| Adjusting the voice | yes | yes |
| Disabling voices | | yes |
| Single-bit DAC architecture | yes | yes |
| CD-text | | yes |
| Resampling audio | 8 | 8 |
| Tone compensation | yes | yes |
| Dimensions (WxHxD) | 180x50x160 mm | 180x100x160 mm |
| Features | Playback of CD-R/RW discs. | Sleep timer (20/40/60 min). Possibility to change the button illumination. Calendar with memory. System of memorizing the audio settings. Playback of CD-R/RW discs. Tape counter. |
