| Composition | RetroSound Redondo RS M4 | JVC KD-R426 |
| Tuner | | has a digital |
| CD players | | yes |
| MP3-players | | yes |
| DVD-player | | no |
| Blu-ray player | | no |
| Amplifier | | yes |
| Equalizer | | yes |
| Navigator | | no |
| TV tuner | | no |
| General characteristics | RetroSound Redondo RS M4 | JVC KD-R426 |
| Display Color | Variable | |
| EQ Bands | 3 | |
| Preamp Outputs | 6-channel | |
| Preamp Voltage | 2.85 volts | |
| RMS Power Bandwidth | Not givenHz | |
| Screen Size | - | |
| Steering Wheel Control Compatible | No | |
| Sub Preamp Outputs | Yes | |
| Switchable Rear Preamp Outputs | No | |
| Video Screen | No | |
| Maximum power | | 4x50 W |
| Size | | 1 DIN |
| CD-changer interface is | | no |
| Color | | black |
| Power | RetroSound Redondo RS M4 | JVC KD-R426 |
| Peak Output | 45 watts | |
| RMS Power (Manufacturer) | 25 watts | |
| Supported carriers and formats | RetroSound Redondo RS M4 | JVC KD-R426 |
| Formats | | CD Audio, MP3, WMA |
| Media | | CD-R, CD-RW |
| Display | RetroSound Redondo RS M4 | JVC KD-R426 |
| Display type | | monochrome |
| Management | RetroSound Redondo RS M4 | JVC KD-R426 |
| Infrared remote | | yes |
| Joystick on the steering wheel | | no |
| Search for a folder/file | | yes |
| Auto plants | | yes |
| Compatibility | RetroSound Redondo RS M4 | JVC KD-R426 |
| Alexa Voice Control | N | |
| Android Auto | No | |
| Android Control | Yes | |
| Bluetooth Compatible | Built-in | |
| CarPlay | No | |
| Siri Control | No | |
| Wireless Remote | No | |
| Interfaces | RetroSound Redondo RS M4 | JVC KD-R426 |
| Audio/video Input | - | |
| AUX Input | Mini (rear) x 2 | |
| Backup Camera Input | No | |
| Memory Card Slot | USB memory | |
| Second Camera Input | No | |
| USB Input | Rear (2) | |
| Inputs | | USB |
| Audio input on the front panel | | yes |
| Outputs | | Subwoofer PreAmp |
| Bluetooth Support | | no |
| Supported formats | RetroSound Redondo RS M4 | JVC KD-R426 |
| High-res Playback | N | |
| Music File Playback | MP3, WMA, FLAC | |
| Protection | RetroSound Redondo RS M4 | JVC KD-R426 |
| Detachable panel | | yes |
| Tuner | RetroSound Redondo RS M4 | JVC KD-R426 |
| Support band | | FM, MW |
| HD Radio | No | |
| Tuner with long reception | | yes |
| Satellite Radio Ready | SiriusXM | |
| Number of preset FM/AM | | 18 / 6 |
| European Tuning | Yes | |
| FM Sensitivity | 12.5 dBf | |
| Radio Data System | Yes | |
| Additional information | RetroSound Redondo RS M4 | JVC KD-R426 |
| Adjusting the voice | | yes |
| The number of bit DAC | | 24 |
| ID3 tag support | | yes |
| Navigation | - | |
| CD-text | | yes |
| Seek/Scan | Seek | |
| Tone compensation | | yes |
| Dimensions (WxHxD) | | 182x52x160 mm |
