AVSL 178.736 PH SERIES User Manual
Page 4
178.734UK 178.736UK User Manual
Setting Up
Connect speakers via the 2 outputs on the rear panel (20) using good quality speaker leads with
6.3mm jack connectors and twin core cable, recommended no smaller than 2 x 0.5mm² CSA.
When connecting speakers to the outputs, ensure that the combined load is no lower than 4 Ohms
(4Ω). To make sure of this, check the manufacturer’s information.
If connecting more than one speaker, observe the following calculation method.
Most PA and sound reinforcement speakers are 8Ω, so we consider that 1/8 + 1/8 = 1/4
Therefore, when connecting 2 x 8Ω speakers to the PH series PA head, the resulting total load is 4Ω.
The amplifier output is mono, so each speaker will receive half of the rated output.
With the power switch (18) in the Off position, connect the IEC inlet (19) to the mains using the
power lead provided, ensuring that the correct voltage is selected (29)
Connect a microphone via the balanced XLR input (1) or a line input into the unbalanced jack or RCA
connectors (2) for each channel to be used.
Wiring for balanced mic and unbalanced line inputs are shown below.