REF475a_001
 
 

Reference 475a

4-Channel full-range amplifier

Unit of sale: Each
Model Number: REF475A

Find dealer

Product details

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

Full specs

Audio Features/Specifications

Number of Channels/Type4 Full-range channels
4-Ohm Power Output75W x 4 less than 1% THD + N
2-Ohm Power Output90W x 4 less than 1% THD + N (14.4V)
Bridged Power Output180W x 2 @ 4 ohms 14.4V
Dynamic Power Output117W @ 2 ohms
Class D OperationNo
Signal-to-noise Ratio (IHF-A)85dBA (ref 1W, 4 ohms)
Damping Factor6.3 @ 4 ohms
Frequency Response10Hz–100kHz
THD + N0.02% (front & rear channels); 0.06% (subwoofer channel)
Input Sensitivity100mV–6V

Control and Connection Features

Variable Electronic CrossoverFront & rear: Independent selectable low-pass or high-pass filters, 32Hz–320Hz, 12dB/octave. Both can be bypassed.
Subsonic FilterNo
Dynamic Bass Optimization (DBO)No
Variable Bass Boost0dB ~ 6dB @ 50Hz
Remote Bass-Level Control IncludedYes
Input Connections4 x Line-level: Front L & R, Rear L & R
Speaker Connections4
Signal Output ConnectionsLine-level (pass-thru)
Port for Future Accessory ProductsYes
Backlit Logo Badge and Dual LED LightbarsNo

General Specifications

Maximum Current Draw72A
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

Specific product service

  • Documents

Manuals

REF475a_OM_EN

Download (1245 kb)

Show additional language versions

Specsheets

REF475a_PI_EN

Download (665 kb)