7
10. Channel 1 speaker binding post: this connector accepts speaker cable as well as 4 mm banana plugs.
Remove the protective cover from the middle of the red/black binding post in case you want to use banana
plugs.
For bridge mode applications, you MUST use the red binding posts only: channel 1 red plug is
bridge mode positive speaker connector.
11. With this switch, you can acivate/deactivate the integrated subwoofer filter circuitry. Standard crossover
frequency is lowpass at 100 Hz. The position marked ‘AP’ has been optimized for use with optionally available
APart-audio passive subwoofers.
12. Mode switch : enables to switch to normal 2 channel stereo operation, 2 channel mixed (mono) operation or
single channel bridge mode. In case of bridge mode, only the channel 1 volume control is used. This is indicated
by the bridge led on the front panel.
13. Channel 2 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 2. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector.
14. Channel 1 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 1. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector. In case of bridge operation of channel 1 and 2, use this connector and
leave channel 2 input unused.
What is bridge mode ?
In bridge mode, you can unite the power of 2 small amplifiers into 1 giant amp.
The resulting power usually is more than double the power of both amplifiers used
individually with the same load. There is a simple reason for this power boost:
because the speaker load is wired to the channel’s positive (hot) connectors, the
amplifiers ‘feel’ half of the actual speaker’s impedance. This means that, despite
the fact that you connect for example an 8 ohm speaker, the amp thinks there is a 4
ohm load, resulting in higher power output per amplifier, and since both amplifiers
work in bridge mode, this increased power is doubled. As a result, the minimum load
impedance in bridge mode is limited to 8 ohms, because every amplifier only ‘feels’
half of this impedance. Set the speaker impedance selector of channel 1 to the 4-8
ohms position for 8 ohms(or higher) loads in bridge mode.
