User's Manual

Ambient Control
No.25 has an array of ambient lights on each side, outboard of the feet. The intensity of these
lights can be controlled with the 4 position AMBITET CONTROL switch. Starting with the
switch in the far counter clockwise position, the lights are off, as the switch in moved to the next
three positions, the intensity will increase. The ambient lights can be triggered off for theater
viewing with a common 12VDC trigger. 0V at AMBIENT TRIG keeps the lights ON, +12V at
this trigger input turns them OFF.
Remote Control Battery Installation
No.25’s Remote Control Unit requires two AAA batteries. These are not installed but are
supplied. To install or replace batteries in the Remote Control Unit, first remove the bottom
aluminum cover by using the supplied 2.5mm Hex key to loosen the two visible screws. With the
bottom cover removed, you will see a battery holder, which will accept two AAA batteries.
Follow the images on the holder for proper orientation of the batteries. After installing the
batteries, test the unit by setting the SECURITY switch to UNLOCK and turning one of the
knobs. If the batteries are installed properly, you will see one of the red LEDs on the remote
control’s front panel illuminate. Replace the bottom cover and tighten the two screws using the
supplied Hex key. Battery life can be extended if the SECURITY toggle switch is left in the
LOCK position when the Remote Control is not in use.
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Connecting Up [major heading]
Always switch off your system before disconnecting any wires.
To increase the versatility of connecting up, the No.25 models have three separate inputs. A high-
level input socket, a .1/LFE input consisting of both RCA and XLR connectors, and a low-level
input that includes two RCA sockets for stereo input. This is to facilitate use with both two-
channel stereo systems and AV surround sound systems.
The high-level, unbalanced, dual-channel (stereo) input is via a Neutrik® Speakon® connector is
designed to accept the stereo (two-channel) signals from the speaker terminals of your receiver,
integrated amplifier or basic amplifier. This has the advantage of ensuring that your subwoofer
receives exactly the same signal as the main speakers, which means that the character of the bass
from the main system is carried forward into the Sub-Bass System.
This is a very important point and together with REL’s Natural RollOff™ circuitry, ensures far
superior system integration of the Sub-Bass System with the main system.
To engage the Neutrik® Speakon® plug, insert fully into socket and rotate clockwise until
locked.
To remove the Neutrik® Speakon® plug, grip body of plug, place thumb on chrome lever, move
lever backwards, rotate plug anticlockwise quarter turn and withdraw.
There are two RCA sockets for low-level connection to the output of a stereo preamplifier or
receiver. Another single RCA socket connects to the .1/LFE output of a home cinema processor.
HIGH LEVEL and .1/LFE inputs can be used simultaneously. The benefits are two-fold when
used with a home cinema processor. The low-level input reproduces the .1/LFE channel and the