Determine whether to use High Level, Low Level, and LFE/.1

High Level Input:

Using the High Level input is always the best option. Using the High Level Input, instead of the Low Level Input, and connecting to the speaker output terminals of your amplifier is one of the unique secrets of REL’s success. When using the High Level input, your REL is fed the same signal that your main speakers are receiving. When connecting to the High Level input on the REL from the amplifier, you capture the sonic signature of your main system, including the tonal balance and timing cues of the entire electronics chain. This is a very important point and together with REL’s Active Bass Controller (ABC), ensures far superior system integration of the sub-bass with the main system.

Low Level Input:

The Low level input is rarely recommended over the High Level input, however this connection method still produces amazing low end and seamless integration. Occasionally, some systems are not compatible with the High Level input or speaker outputs are unavailable. There are really only two scenarios when we recommend using the Low Level input rather than the High Level input.
1. The Low Level input is recommended when users do not have access to speaker outputs such as connecting directly to TV or computer.
2. The Low Level input is recommended when using a single REL with Monoblock Amplifiers. When integrating a REL Sub-Bass system with Monoblock amplifiers REL recommends using a stereo pair of RELs as left and right subwoofers.

LFE/.1 input:

The LFE/.1 input is only used when connecting your REL to a surround sound system. The LFE/.1 input can be used simultaneously with the High Level or Low Level input for seamless transition from Stereo to surround sound.