52
Appendix
1+1-
2-2+
Amplifier output
to load resistor
Bass module
sensing output
Neutrik Speakon
4 pole connector
(back shown)
16-18AWG twisted pair wire
18AWG twisted pair wire
Dual banana jack
Dual banana jack
GND
GND
3. Bass Amplifier Output Test Cable:
This cable is used to connect the B1 Bass Module output jack to the load resistors used in the
test procedures.
Parts needed:
1- Neutrik
®
Speakon
®
NL4FX X-Line/4 Pole connector.
4 - Dual banana jacks
2 - 10k ohm, 1/4 Watt resistors
16 or 18 AWG twisted pair wire, 6 feet
18 AWG twisted pair wire, 2 feet
The connector used is a Neutrik NL4FX Speakon X-Line / 4 Pole type. This connector has 4
terminals labeled 1+, 1-, 2+ and 2-. Terminals 1+ and 1- are used to connect to the load resis-
tors. Use 18 or 16 AWG wire for these terminals. Use twisted pair wires to avoid inducing noise
into the cable during use.
The 2+ and 2- terminals will be used to sense the loads connected to the Speakon connector
when used with the B1 Bass Module jack. This jack automatically senses the load on this jack to
properly tailor the EQ and output level for the connection of one or two bass modules. It does
this by sensing the resistive value across terminals 2+ and 2-. The bass modules have a 10k
ohm resistor across these terminals. When only one bass module is connected, the power stand
sees the 10k resistance and sets the EQ and output level accordingly. When two bass modules
are connected, it sees 5k and sets the EQ and output level accordingly. For the test cable, you
will use 18 AWG twisted pair wire to a dual banana jack.
It is also useful to have 3 spare banana jacks, one with a short across it and 2 with a 10k Ohm,
1/4 Watt resistor each to simulate a bass module connected to the terminals.
Amplifier Output Test Cable Wiring Diagram
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