Avsl 172.132UK User Manual - Page 3

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Operation

Connect speaker cabinets to channel outputs using good quality Speakon

connection or 4mm plugs (21, 22) and ensure that the combined load on each channel is no lower than 2Ω.

For speaker loads connected in parallel...

Therefore...

The rear panel has a MODE switch (10), which determines the way that the amplifier operates, indicated by LEDs above

the switch. The standard operating mode is STEREO, with each input feeding its relevant speaker output.

PARALLEL mode sums both inputs together in mono so that each amplifier channel receives a mix of both inputs.

Also, both channels can be combined to drive a single load at higher power by selecting BRIDGE mode. In this mode,

the input is on channel 1 and the output is from the OUT 1 speaker connections as indicated on the rear panel (Speakon

connection should be wired to pins 1+ and 2-) WARNING – The minimum load for BRIDGE mode is 4Ω.

Below the MODE switch is a SENSITIVITY switch (11), which has 3 settings for different input levels.

The standard setting is 1.0V and further settings for 1.4V and 2.0V higher level inputs will reduce the input sensitivity.

When set to ON, the LF PROCESSING switch (18) provides a 2dB boost around 100Hz for enhanced bass response.

If using the H3200 amplifier with a subwoofer cabinet, switching the CROSSOVER switch (19) to 120Hz will filter out

higher frequencies to enable the amplifier to focus all of its energy on the sub-frequencies. The normal setting is OFF.

Connect each signal input from mixer or other line level source via XLR or 6.3mm jack connectors to the combo

connectors (9, 12) on the rear panel using good quality signal leads. Depending on the output level of the mixer, select

the appropriate sensitivity on the rear panel. Wiring connections for balanced or unbalanced inputs are as follows...

Connector type

Signal hot +

6.3mm jack

Tip

XLR

Pin 2

Each channel input also has a corresponding XLR line output (17, 20) for linking onto further equipment, as necessary.

XLR inputs and outputs for each channel are wired in parallel, allowing signal to be carried forward to further amplifiers.

Connect the amplifier to a mains supply (15), ensuring the IEC lead is earthed, in good condition and connected securely.

With Channel 1 + 2 controls (2, 6) turned fully down, switch on the power to the amplifier (7). This unit has a "soft-start"

function which makes some checks before engaging power to the amplifiers, which may take a few seconds.

With mixer (or other signal source) levels turned down, gradually increase the amplifier's channel level controls to the

required level (normally full) and then gradually increase the signal level from the mixer or sound source until sound can

be heard through the speakers and then continue increasing up to the required level.

The LED indicators for each channel (3, 5) are as shown opposite.

In normal operation, the POW indicators will be on and the SIG indicators will

light when an input signal is present.

If the input signal is overloading the amplifier, this "clips" above the available power limit.

When this happens, the CLIP indicators will light.

It is acceptable for CLIP indicators to flash very briefly in response to loud peaks in the audio signal.

However, if they light for any longer than a brief instant or very frequently, the input level should be reduced or channel

level controls on the front panel should be turned down until the regular clipping is eliminated.

If the internal protection circuitry detects a fault in the speakers or amp, the channel(s) will enter protect mode and PRO

will illuminate on the front panel to show this. Switch the amplifier off and check the entire system (including speaker

leads) before powering up again. If still in Protect Mode, seek advice from qualified service personnel.

1/speaker impedance + 1/speaker impedance... = 1/TOTAL impedance.

8Ω + 8Ω =

4Ω + 4Ω =

8Ω + 8Ω + 8Ω + 8Ω = 2Ω total

Signal cold -

Ground (GND)

Ring

Sleeve

Pin 3

Pin 1

leads (13, 14) or alternatively with bare wire

4Ω total

2Ω total

Unbalanced wiring

Ring + Sleeve combined

Pin 3 + Pin 1 combined

PRO

Protect mode

CLIP

Signal clipping (overload)

SIG

Signal present

POW

Power on

172.132UK User Manual