Инструкции Пользователя для Mackie DLM12S

Owner’

s Manual

•  Check the polarity of the connections between the

   mixer and the subwoofers. You may have your
   positive and negative connections reversed at one
   end of one cable, causing one subwoofer to be
   out-of-phase with the other.

•  Poor bass performance may be the result of bad

   AC power. See the section titled ‘AC Power’ on
   the previous page for further details.

•  Is it loud and distorted? Make sure that you’re not

   overdriving a stage in the signal chain. Verify that
   all level controls are set properly.

•  Is the input connector plugged completely into

   the jack? Be sure all connections are secure.

•  Make sure all connections to the active

   subwoofers are good and sound.

•  Make sure none of the signal cables are routed

   near AC cables, power transformers, or other
   EMI-inducing devices.

•  Is there a light dimmer or other SCR-based device

   on the same AC circuit as the DLM12S? Use an
   AC line filter or plug the subwoofer into a

   different AC circuit.

•  Try disconnecting the cable connected to the

   input jack. If the noise disappears, it could be
   a “ground loop,” rather than a problem with the
   DLM12S subwoofer. Try some of the following
   troubleshooting ideas:

•  Use balanced connections throughout your system

   for the best noise rejection.

•  Whenever possible, plug all the audio equipment’s

   line cords into outlets which share a common
   ground. The distance between the outlets and the
   common ground should be as short as possible.

If you think your Mackie product has a problem,

please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs and other documentation. You may find the answer
to the problem without having to send your Mackie
product away.

•  Our favorite question: Is it plugged in? Make sure

   the AC outlet is live [check with a tester or lamp].

•  Our next favorite question: Is the power switch

   on? If not, try turning it on.

•  Make sure the line cord is securely seated in the

   line cord socket and plugged all the way into the
   AC outlet.

•  Is the power LED on the front panel glowing

   green? If not, make sure the AC outlet is live.
   If so, refer to “No sound” below.

•  The internal AC line fuse may be blown. This is

   not a user serviceable part. If you suspect the
   AC line fuse is blown, please see the "Repair"
   section next.

•  Is the input level control for the input source

   turned all the way down? Verify that all the volume
   controls in the system are properly adjusted.
   Look at the level meter to ensure that the mixer
   is receiving a signal.

•  Is the signal source working? Make sure the  

   connecting cables are in good repair and securely
   connected at both ends. Make sure the output
   volume (gain) control on the mixing console is
   turned up sufficiently to drive the inputs of the
   speaker.

•  Make sure the mixer does not have a mute on or a

   processor loop engaged. If you find something like
   this, make sure the volume/gain is turned down
   before disengaging the offending switch.

•  Has it shut down? Make sure there is at least

   six inches of free space behind each DLM

   subwoofer.