AVSL 178.736 PH SERIES - Manual (Page 5)

178.734UK 178.736UK User Manual
Operation
To check an input, ensure that Low and High EQ controls (3, 4) are set to the vertical (12 o’clock)
position and the Delay and Level controls (5, 6) are turned fully down.
Also, turn down the USB/SD and AUX input level controls (13, 12).
Turn the Master volume control (11) down and set all Graphic EQ sliders (16) to the halfway position.
Switch the mains power on, turn up the Master volume control (11) part way and gradually increase
the Channel output level (6) for the microphone or line input source whilst checking the output
through the connected speakers.
Alternatively, a USB pen drive or SD card with compressed audio tracks stored can be connected to
the USB/SD Audio Player for checking playback through the speakers.
More details can be found in the “USB/SD player” section of this manual.
Once the sound has been checked through the speakers, increase the Master volume to the required
level, ensuring that the LED level meter (15) doesn’t continually reach into the red (+6dB).
The red +6dB level meter LED should only ever light briefly on the loudest peaks of the sound (e.g.
bass drum beat) and if it lights for anything longer than momentarily, the Channel or Master levels
must be reduced until it stops lighting.
Adjust the channel output level controls to balance the mix of inputs and if required, adjust the tone
of any channel by boosting or cutting the Low and High controls (3, 4) – vertical position is neutral.
Furthermore, tone adjustment for the overall mix is available via the master Graphic Equalizer.
This section is home to 5 sliders which range from 100Hz to 10kHz centre frequencies.
They can be otherwise considered from left to right as Low, Lo-mid, Mid, Hi-mid and High EQ.
Halfway up the slider is neutral, top position is 12dB boost and bottom is 12dB cut of that frequency.
The PH series PA heads have a built-in Delay section for producing echo effects for vocals or line
level inputs. Each channel has a rotary control for Delay level (5), which varies the amount of the
input fed to the Delay Section. Turn the master Delay control (7) up part way and then gradually
increase the channel Delay level (5) to hear the effect.
The Delay effect can be adjusted to have longer or shorter delay time intervals by adjusting the Time
control (8) and the number of repeats for the echo effect can be adjusted via the Repeat control (9)
The AUX IN control (12) adjusts the volume level of the AUX IN inputs (10)
The AUX IN inputs (rear panel for PH4150) are suitable for any line level source.
(these 2 x RCA inputs are summed to mono as the amplifier is single channel)
The REC outputs (14) are 2 x RCA connectors which carry the main mix output, suitable for recording
or linking onto another amplifier.
The USB/SD control (13) varies the level of the USB/SD player to the main mix.
When not in use, remove USB or SD media, turn down the Master volume control and switch off.
Disconnect from the mains if not in use for long periods.