6. Troubleshooting
• Because they are line-array speakers these speakers will naturally achieve high gain-before-feedback ratios. Unfortunately,
this does not mean that they well never feed back. Be prepared!
• A pair of prototype SA-12s was subjected to a fifteen-month stint in a world-class nightclub with name acts playing through
them while being driven by a 1200 W/Ch amplifier. The system experienced three or four driver failures over this period
(out of a total of 24 drivers). Each time, one of the drivers became intermittent. The point of failure was always the joint
between the tinsel lead and the voice coil. No other failures were seen and there was never a burnt voice coil. Under
normal use therefore, it is unlikely that you should ever experience a failed driver.
Drivers are arranged in series-parallel. Each group of three starting at the top is in series, and all the groups are then
paralleled. If one driver opens up, three will stop working.
For Experienced Professional Personnel Only: If you suspect a failed driver, here is a simple method for finding it. Remove
the grille and apply a low frequency continuous tone at low level (just loud enough to hear when you’re standing next to
the speaker) to the suspect loudspeaker. Gently press in on the cones of each of the speakers in the group where you
suspect a problem. The failed driver can then be identified as the one that changes the sound of the group when you press
on it. If the driver is completely open, you will need to remove the drivers in the failed group, one at a time, and
temporarily short its leads. If the other drivers start to work, you’ve found the failed driver. Never short the leads on more
than one driver at a time. Never drive the speakers with a high level signal while performing this test, as there is a risk of
shock and damage to the amplifier.
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