| Composition | KENWOOD Z 638 | JVC KD-R426 |
| Tuner | has a digital | has a digital |
| CD players | yes | yes |
| MP3-players | yes | yes |
| DVD-player | no | no |
| Blu-ray player | no | no |
| Amplifier | yes | yes |
| Equalizer | yes | yes |
| Navigator | no | no |
| TV tuner | no | no |
| General characteristics | KENWOOD Z 638 | JVC KD-R426 |
| Maximum power | 4x50 W | 4x50 W |
| Size | 1 DIN | 1 DIN |
| CD-changer interface is | custom | no |
| Management changer | CD | |
| Color | silver | black |
| Supported carriers and formats | KENWOOD Z 638 | JVC KD-R426 |
| Formats | CD Audio, MP3 | CD Audio, MP3, WMA |
| Media | CD-R, CD-RW | CD-R, CD-RW |
| Display | KENWOOD Z 638 | JVC KD-R426 |
| Display type | multicolor | monochrome |
| Management | KENWOOD Z 638 | JVC KD-R426 |
| Infrared remote | yes | yes |
| Joystick on the steering wheel | no | no |
| Multicolor lighting | yes | |
| Search for a folder/file | | yes |
| Auto plants | | yes |
| Pause when speaking on the phone | yes | |
| Memory disk names | yes | |
| Interfaces | KENWOOD Z 638 | JVC KD-R426 |
| Inputs | | USB |
| Audio input on the front panel | no | yes |
| Outputs | audio | Subwoofer PreAmp |
| Bluetooth Support | no | no |
| Gold-plated connectors | yes | |
| Protection | KENWOOD Z 638 | JVC KD-R426 |
| Detachable panel | yes | yes |
| Tuner | KENWOOD Z 638 | JVC KD-R426 |
| Support band | FM, MW, LW | FM, MW |
| Tuner with long reception | | yes |
| Number of preset FM/AM | 18 / 6 | 18 / 6 |
| RDS | RDS RDS PTY | |
| Additional information | KENWOOD Z 638 | JVC KD-R426 |
| Adjusting the voice | yes | yes |
| The number of bit DAC | | 24 |
| ID3 tag support | no | yes |
| CD-text | yes | yes |
| Single-bit DAC architecture | yes | |
| Tone compensation | yes | yes |
| Dimensions (WxHxD) | 180x50x160 mm | 182x52x160 mm |
| Resampling audio | 8 | |
| Features | Display 3DFL. Sleep timer (20/40/60 min). Possibility to change the button illumination. Calendar with memory. | |
