MK Sound operation manual LFE-4FRONT PANEL, LFE-4REAR PANEL

Bass Management Controller

The LFE-4 consists of a series of five high-pass filters (one each for the L, C, R, LS, LR channels) that route high frequency information (above 80Hz) to their appropriate channel’s amplifier and speaker monitor. Each channel is also routed through a matching 80Hz low-pass filter. This low frequency information is then routed to a summing amplifier, which in turn sends this low frequency information, along with the LFE channel, to two dual subwoofer outputs.

This is done for two reasons. First, small loudspeakers cannot reproduce information below 80Hz. At least, not with any authority. This information is therefore summed together and redirected from the individual channels to a loudspeaker that can reproduce this low frequency information with clarity and power – a subwoofer. With the introduction of digital audio, it has become necessary for loudspeaker systems to be able to accurately reproduce audio that has a bandwidth of 20Hz to 20kHz with wide dynamics. A satellite/subwoofer system is the best way to accomplish this.

Secondly, most home theater receivers have some form of bass management in their processors. In order for work done in the studio to translate properly, the mixer must hear his mix exactly the way it will ultimately be played back. The LFE-4 together with a properly set-up and calibrated M&K monitor system allows the mixer to hear his work with more accuracy than might otherwise be possible.

The LFE channel is a discrete channel created by the mixer to supplement the low frequency content of the mix.

The subwoofer channel is the summed low frequency content from the five main channels plus the LFE channel. It is created by the processor in the encoder/decoder of your chosen format, or in this case, the LFE-4.

The LFE-4 correctly balances these channels so the mixer can accurately hear how the format processor will affect his mix.

The goal is to be able to accurately monitor multi-channel audio with a bandwidth of 20Hz to 20kHz containing extreme dynamics and have that audio translate accurately when played back on other systems.

Aproperly set-up and calibrated M&K monitoring system with an LFE-4 will allow the mixer to make quick and accurate decisions in a listening environment that he will find satisfying and enjoyable.

FIGURE 1: LFE-4 FRONT PANEL

LFE-4

Studio Bass Management Controller

Subwoofer Left Center Right Left Surround Right Surround

FIGURE 2: LFE-4 REAR PANEL

SIGNAL

CHASSIS

GND

GND

24 VAC

RIGHT SUR

RIGHT SUR

LEFT SUR

LEFT SUR

RIGHT

RIGHT

CENTER

CENTER

LEFT

LEFT

LFE IN

LFE IN

SUB OUT

SUB OUT

IN

IN

OUT

IN

OUT

IN

OUT

IN

OUT

IN

OUT

+0 dB

+10 dB

1

2

6