Three different equalization/bandpass filtering modes tailor the frequency response of the MTD115b to suit different applications (selected via front panel switch). In MONITOR mode, high pass filtering is set at 45 Hz and a modest low frequency shelf is applied to provide an equalization contour suitable for floor monitor applications. In FRONT mode, a 45 Hz high pass filter is employed and increased low frequency shelving provides an equalization contour that is more suitable for FOH use. In X- OVER mode, a 100 Hz high pass filter is applied since the MTD115b is intended to be used with additional subwoofers.
For subwoofer drive, the second front panel switch allows for selection of bandpass filtering and equalization that is optimized for either SB115, SB118 or SB218 subwoofers. The processed subwoofer signal output is then available on the XLR connectors provided on the front or rear panels of the controller.
Note: The SB118 setting should be employed when using the LLC 115b-st or LLC 115b-2w controller for dV- SUB processing (bandpass filtering and equalization are compatible)
For the LLC 115b-st, two input signals (Ch A, B) are applied to the line input XLR connectors on the front panel of the controller. Rear panel XLR line outputs (Ch A, B) are connected to the power 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.