L-ACOUSTICS MTD Manual V1.2 11/30/2004 26
amplifier inputs with the amplifier outputs then connected to the controller "Sense Return" input
Speakon connector (Ch A = 1+/1-, Ch B = 2+/2-). Since the amplifier is connected in a loop, LLC
sense return protection circuitry can monitor the signal applied to the loudspeakers and provide
thermal protection of speaker components plus voltage- and frequency-dependent cone excursion
limiting provided that the power amplifier has 32 dB gain
. The front panel of the LLC 115b-st is then
used as a patch panel with Ch A, B loudspeakers connected via the two 4-pin Speakon connectors
provided.
For the LLC 115b-2w controller, a single input signal is applied to the line input XLR on the front
panel. Rear panel LF and HF XLR outputs are connected to power amplifier input channels with the
amplifier outputs then connected to the controller “Sense Return” input speakon connector (LF =
1+/1-, HF = 2+/2-). As for the LLC 115b-st, protection circuitry monitors the signal applied to the
loudspeakers to provide thermal protection of speaker components plus voltage- and frequency-
dependent cone excursion limiting provided that the power amplifier has 32 dB gain
. The front panel
of the LLC 115b-2w is then used as a patch panel with loudspeaker connection via the 4-pin Speakon
connector provided.
4. MTD CONFIGURATIONS
The following section provides a number of block diagram representations of various MTD systems.
Examples of floor monitor, stereo FOH system with mono subwoofers and stereo FOH system with
stereo subwoofers packages are shown. Please refer to sections 4.1 - 4.3 for MTD108a examples,
sections 4.4 - 4.6 for MTD112b examples, sections 4.7 – 4.9 for MTD115b (passive) examples and
sections 4.10 – 4.12 for MTD115b (active) examples.
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