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4. Input selection switch - This switch, is used to match the amplifier’s input to the source unit’s or DSP unit’s output.
If your source unit or DSP unit has a mono output you can select: Mono L or Mono R as your input connection,
if your source unit or DSP unit has a stereo output you need to select SUM for input now both RCA inputs of the
amplifier are active and the stereo signal will be converted into a mono signal by the amplifier.
5. EBC port - For connecting the included External Bass Control. A remote bass control so the bass can be adjusted
from the driver’s seat.
6. Subsonic filter control - This control is used to select the desired (high pass) subsonic filter frequency. The sub-
sonic filter protects the subwoofer(s) against too low frequencies that can dammage the subwoofer(s).
7. Low pass x-over frequency control - This control is used to select the desired low pass x-over frequency. The
frequency can be adjusted between 40Hz and 200Hz.
8. Speaker Terminals – Be sure to observe speaker polarity through the system. Failing to wire the speakers in
proper phase could result in a loss of bass response and/or poor
overall sound quality. Caution: MTX Xthunder amplifiers are not recommended for loads below 2 ohms stereo or 4
ohms bridged.
9. Fuse - For convenience, all MTX XTHUNDER amplifiers utilize ATC type fuses. For continued protection in the
event that a fuse blows, replace the fuse only with the same value.
Caution : The power fuse on the amp is for protecting the amp against overdrive. To protect the vehicle’s electrical
system, an additional fuse is required within 30cm of the battery on the 12V+ cable.
10. Power Terminal – This is the main power input for the amplifier and must be connected directly to the positive
terminal of the car battery for the amplifier to operate properly. Use caution when running this cable through the
vehicule. Try to avoid running this cable along side the input RCA cables, antenna cabling, or other sensitive equi-
pment as the large amount of current flowing through this cable can induce noise into your system. It is also very
important to have a tight connection to ensure maximum performance. We recommend to use 10mm2 or larger
power wire with the MTX XTHUNDER X500D amplifier.
11. Remote Terminal – The Amplifier can be turned on by applying 12 volts to this terminal. Typically this voltage is
supplied by a wire from the source unit marked “remote” or “electric antenna”.
12. Ground Terminal – A good quality ground is required for your Amplifier to operate at peak performance. A short
length of cable the same gauge as your power cable should be used to attach the ground terminal directly to the
chassis of the vehicle. Always scrape or sand any painted surfaces to expose bare metal where the ground wire
will attach.
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