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Inputs – Slave amplifiers
The S121 and S251 slave amplifiers accept a LINE IN via 2 x RCA connectors at the rear and the same signal can
be sent out to further amplifiers from the LINE OUT pair of RCA connectors. Since the amplifier is mono, all stereo
inputs are summed together.
Inputs – Mixer-amplifiers
A microphone can be connected to MIC1 channel by either 6.3mm jack or XLR to the front panel combo input. If
required, there is also a 6.3mm jack connection on the rear panel for MIC1 channel. A further microphone can be
connected to MIC2 channel via a 6.3mm jack on the rear panel.
Line inputs (e.g. CD, DVD, mp3 players) can be connected to LINE1 and LINE2 channels via pairs of RCA
connectors on the rear panel. Alternatively, for the USB/FM/AUX channel, a stereo 3.5mm socket on the front panel
can be used instead – ideal for portable mp3 players etc.
There is also a USB type A connector on the front panel for playback of digital audio files stored on a USB pen.
The overall mix can be connected to further amplifiers via the OUTPUT pair of RCA connectors.
Operation
With all volume levels and VOX control turned down, connect the amplifier to the mains supply (ensure correct
supply voltage) using a suitable IEC lead (as supplied) and switch POWER on.
HIGH and LOW EQ controls should be initially set to the vertical "12 o'clock" position.
If microphones are being used, turn up the MASTER control approximately half way and gradually increase MIC1
rotary level control whilst speaking into the microphone until the required volume is reached. Repeat for MIC2
volume control. Adjust HIGH and LOW EQ controls to alter the overall bass and treble response of both
microphones as needed.
For any line level devices connected to line input channels, adjust the LINE1 and LINE2 level controls in the same
way as for the microphone channels. Overall tone of the line inputs (including the USB/FM/AUX) can be adjusted
via the HIGH and LOW controls.
For the USB/FM/AUX channel, pressing MODE toggles between the USB device, FM tuner or AUX input as a
sound source. Turning the USB/FM/AUX level control increases the level of the playback through the amplifier
For the FM tuner, an initial channel search can be performed by pressing "CH –" followed by "PLAY/PAUSE" .
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