Next PROAUDIO X12, Руководство пользователя

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NEXT X Series - User Manual
www.next-proaudio.com
- 12 -
V201805
POWER CABLE SELECTING
Selecting a cable consists of calculating the correct cable section (size) in relation to the load
impedance and the required cable length. A small cable section will increase its serial resistance,
which will induce power-loss and response variations (damping factor).
The following table indicates, for 3 common sizes, a cable length with a maximum serial
resistance equal to 4% of the load impedance (damping factor = 25):
Cable section
Maximum Length related to load impedance
8Ω 4Ω
1.5mm² [16AWG] 12m [40 ft] 6m [20 ft]
2.5mm² [14AWG] 20m [64 ft] 10m [32 ft]
4mm² [12AWG] 32m [104 ft] 16m [52 ft]
TROUBLESHOOTING
Simple troubleshooting does not require sophisticated measurement equipment and can be
easily undertaken by users. The technique should be to segment the system in order to identify the
faulty system component: signal source, controller, amplifier, loudspeaker or cable? Most installations
are multi-channel, it is often the case that one channel works and others do not. Trying different
combinations of system elements can usually help to isolate and locate the fault.
Some cabinet faults can be quite easily identified and corrected by the user. A simple sweep with
a sine wave generator can be very helpful though it MUST be made at a fairly low level to prevent
damage to the speakers. A sine wave sweep can help find:
•
Vibrations due to loose screws.
•
Air-leak noises: check that no screws are missing, particularly where the accessories attach
to the cabinet.
•
Vibrations due to a front grille badly positioned on the quick release fixings.
•
Foreign object that has fallen into the cabinet after repair or through the ports.
•
Internal connection wires or absorbing material touching the loudspeaker diaphragm: check
by removing the bass loudspeaker.
•
Loudspeaker not connected or phase reversed following a previous inspection, test or repair.
Do not attempt to service your X Series unit beyond what is described in this manual. All
other service or repair of this product should be carried only by qualified personnel.