Reference 475a
4-Channel full-range amplifier
| Unit of sale: |
Each |
| Model Number: |
REF475A |
Find dealer
4-Channel full-range amplifier with on-board electronic crossover and variable bass boost.
The RCA low-level inputs on the 475a have allow for connection to both a preamp level signal and direct connection to a high-level factory head unit.
The 475a comes outfitted with a variable 12dB per octave electronic crossover allowing you to optimize system tuning based on speaker location and accompanying loudspeaker components.
A variable bass boost circuit is provided to optimize the low frequency performance of your system.
Full range preamp outputs are provided facilitating multiple amplifier hookups without the need for costly Y-adapters or signal splitters.
The Reference 475a's high-output PWM MOSFET power supply ensures optimum power delivery into numerous impedances with low distortion.
Back to top
Audio Features/Specifications
| Number of Channels/Type | 4 Full-range channels |
| 4-Ohm Power Output | 75W x 4 less than 1% THD + N |
| 2-Ohm Power Output | 90W x 4 less than 1% THD + N (14.4V) |
| Bridged Power Output | 180W x 2 @ 4 ohms 14.4V |
| Dynamic Power Output | 117W @ 2 ohms |
| Class D Operation | No |
| Signal-to-noise Ratio (IHF-A) | 85dBA (ref 1W, 4 ohms) |
| Damping Factor | 6.3 @ 4 ohms |
| Frequency Response | 10Hz–100kHz |
| THD + N | 0.02% (front & rear channels); 0.06% (subwoofer channel) |
| Input Sensitivity | 100mV–6V |
Control and Connection Features
| Variable Electronic Crossover | Front & rear: Independent selectable low-pass or high-pass filters, 32Hz–320Hz, 12dB/octave. Both can be bypassed. |
| Subsonic Filter | No |
| Dynamic Bass Optimization (DBO) | No |
| Variable Bass Boost | 0dB ~ 6dB @ 50Hz |
| Remote Bass-Level Control Included | Yes |
| Input Connections | 4 x Line-level: Front L & R, Rear L & R |
| Speaker Connections | 4 |
| Signal Output Connections | Line-level (pass-thru) |
| Port for Future Accessory Products | Yes |
| Backlit Logo Badge and Dual LED Lightbars | No |
General Specifications
| Maximum Current Draw | 72A |
| Dimensions (H x W x D – Metric/English) | 360mm x 229mm x 68mm (14-3/16" x 9" x 2-11/16") |
Back to top
- Overview
- Documents
- Product updates
- Service center
Manuals
REF475a_OM_EN
Download
(1245 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Danish)
Download
(1583 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Finnish)
Download
(1581 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (French)
Download
(1560 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (German)
Download
(1588 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Italian)
Download
(1582 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Portuguese)
Download
(1555 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Russian)
Download
(1565 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Spanish)
Download
(1580 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Swedish)
Download
(1568 kb)
Owners Manual - Reference 475a 5350a 1300a 1600a (Dutch)
Download
(1586 kb)
Show additional language versions
Hide additional language versions
Specsheets
REF475a_PI_EN
Download
(665 kb)
Specification Sheet - Reference Amplifiers (French EU)
Download
(771 kb)
Specification Sheet - Reference Amplifiers (German)
Download
(1301 kb)