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Rear Panel
Operation
Connect speaker cabinets to channel outputs using good quality leads and ensuring that the combined load on
each channel is no lower than 4Ω (for speaker loads connected from one to another, 8Ω + 8Ω = 4Ω).
Connect the left and right signal input from mixer or other line level source via the combo connectors on the rear
panel using good quality 6.3mm jack or XLR leads.
If the signal is to be cascaded onto other amplifiers, connect these via the XLR line level outputs.
Connect the amplifier to the mains outlet, making sure that the IEC lead is in good condition and connected
securely.
For extra protection of speakers and amplifier, the CLIP LIMITER may be switched in to help prevent overload.
In some extreme cases, the operation of the clip limiter can be obtrusive. In these cases, disable the clip limiter and
use a dedicated compressor/limiter to control the high dynamics.
If the amplifier is not driving sub cabinets or is driving cabinets which cannot produce very low frequencies, the High
Pass Filters (HPF) may be switched in to avoid excessively low frequencies, which will not be able to be reproduced
and thus dissipate as heat, reducing efficiency. Settings for 30Hz and 50Hz are available.
Select the GAIN level of the input signals (standard is 26dB may also be used to curtail the input level)
Select the mode in which the amplifier is to be used…
PARALLEL sums both left and right input signals together and feeds the mono signal to both amplifier
outputs. This is useful when driving sub cabinets (which, in arrays, benefit from working together in mono)
and when each channel is powering speakers in different areas (avoiding one area hearing only left output
and the other only right)
STEREO is the normal mode of operation where each input is delivered to each output independently
BRIDGE mode couples both amplifier sections together to deliver the full rated power to a single output.
The minimum impedance is 8Ω in this mode. An LED (“BM”) shows when this mode is engaged
The GROUND LIFT switch disconnects signal ground (or “earth”) from mains ground. In certain cases, it may help
to alleviate mains hum otherwise, leave ground connected to mains ground.
9. Mains inlet - IEC 15. CLIP LIMITER switch
10. CH2 output 16. GAIN input level selector
11. Bridge mono output 17. MODE switch (Parallel/Stereo/Bridge)
12. CH1 output 18. CH1 and CH2 High Pass Filters (HPF)
13. Cooling vent 19. GROUND LIFT switch
14. Combo signal inputs (XLR or jack) 20. Signal line outputs (XLR)
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