User Manual
Overload Protecon
All REL Sub-Bass Systems are designed as true sub bass speakers. They are designed to reproduce those
exceponally deep notes that are felt as well as heard. This it will aempt to do at whatever volume level you
set. If set too high no damage should result because the built-in electronics will limit the cone movement.
This electronic control is called Set-Safe™. It constantly and instantaneously monitors the output from the
power amplier and is totally transparent in operaon unl required. This means it has absolutely no eect
on the sound quality of your REL unl an overload is detected.
Ordinarily an overload would cause the power amplier to go into clipping with resultant loss of control over
the drive unit. This can cause drive unit damage, and always sounds nasty. Set-Safe™ detects the point of
incipient clipping and gently so-clips the waveform of the signal to ensure actual clipping does not occur.
This is a necessarily simplied descripon of what actually happens, but in eect, Set-Safe™ controls the
amplier and ensures there is minimum risk of amplier and driver damage caused by over-driving.
A thermal overload device is ed to all 212/SX Sub-Bass Systems. If the unit is deliberately over-driven
this device will sense the temperature rise and cut the output; recovery me is approximately ve minutes.
If this happens, it is a warning that the unit is being over-driven and the volume level control should be
reduced to a safe level.
Although everything possible has been done to minimize risk of thermal overload failure, there can be
no defense against those individuals who deliberately abuse the device. Such damage is NOT covered by
warranty. Please remember your REL is there to supplement your main system, not overwhelm it!
Power Saving Eciency
All REL Sub-Bass System designs ulize a true ON/OFF switch that aords the owner the ability to turn
o their unit completely, without having to unplug the A/C mains cord. When a REL Sub-Bass System is
switched o using the ON/OFF switch on the rear panel it draws ZERO power.
In addion to the ecient power-at-idle exhibited by all REL models, the 212/SX also features an automac
standby mode that is enabled when the power mode switch on the rear of the unit is set to the STANDBY
posion. In this mode, the input signal is constantly monitored for audio acvity. If no audio informaon is
detected over a period of 30 minutes, the unit will enter a low power standby mode in which less power is
consumed. When input signal acvity is detected, the unit resumes normal operaon. By using the standby
mode, you can ensure that there is no unnecessary power draw when the unit is not in use.
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