L-ACOUSTICS MTD Manual V1.2 11/30/2004 23
2.5 CONNECTORS AND CABLES
MTD108a, MTD112b and MTD115b are all supplied with dual NL4 Speakon connectors. The two
Speakon connectors are internally wired in parallel, allowing for loop through connection and parallel
operation of multiple MTD enclosures. For passive enclosures (MTD108a, MTD112b), Speakon
wiring is 1+ / 1- for normal operation (positive polarity). For the MTD115b in active mode, speakon
connector wiring is as follows:
1+ = LF+
1 - = LF -
2+ = HF+
2 - = HF –
In order to preserve high damping factor (essential to the sonic qualities of the system and to prevent
overshoot of cone displacement which can result in mechanical damage), it is desirable to keep
loudspeaker cables as short as possible and with a gauge offering low resistance per unit length. The
following chart provides information regarding the minimum wire cross-section versus length:
Table 15: Maximum Recommended Length for Damping Factor > 20
Cross Section Gauge 8 ohms 4 ohms
Metric (mm2) Imperial Metric Imperial Metric Imperial
2.5 13 30 m 100 ft 15 m 45 ft
4 11 50 m 150 ft 25 m 75 ft
6 8 75 m 225 ft 37 m 110 ft
10 6 120 m 360 ft 60 m 180 ft
As standard, L-ACOUSTICS F-CABLE (SP7, SP25) and F-LINK CABLE (SP.7) loudspeaker cables are 4
conductor cables with 4 mm
2
conductor cross-section (11 gauge). SP25 cables can be used for 25
meter cable runs to power a 4 ohm load (2 x MTD108a, MTD112b or MTD115b enclosures in
parallel) while maintaining a damping factor greater than 20.
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