Hafler SR2300CE, SR2800 BIAMP/STEREO Switch, STEREO/MONO 70V 100V Switch, Protect, Load Switch

BIAMP/STEREO SWITCH

Turn amplifier off before operating this switch. This switch is located on the rear panel and selects either:

Stereo mode- 2 input signals and 2 output signals.

Biamp mode- 1 input signal and 2 output signals.

Biamp mode is useful if a mono signal needs to be distributed to speakers of differing impedance or power level. The load switch for each channel can be selected for the appropriate load, and the level controls can be adjusted individually for each channel. See diagrams

The Stereo/Biamp switch is defeated whenever the front panel Stereo/Mono switch is in the Mono position. In this case, the Stereo/mono switch overrides the Stereo/Biamp switch, and the amplifier operates in mono mode.

STEREO/MONO 70V 100V SWITCH

Turn amplifier off before operating this switch. This switch will override the Stereo/Biamp switch.

This Stereo/Mono 70V 100V switch is located on the front panel and selects either:

Stereo mode- 2 input signals and 2 output signals.

Mono, 70V, 100V mode- 1 input signal and 1 bridged output signal.

Mono mode uses the CH B input connector and level control only. The output load should be connected across the red ter- minals of the output connectors. Set both load switches equal to 1/2 the load value. For example, after connecting a 4Ω load across the red terminals, set both load switches to 2Ω. The rated power into the mono load will be double the rating for a stereo load. See diagram

70V and 100V Mono mode also use the CH B input connector and level control only. The 70V or 100V speaker array load should be connected across the red terminals of the output connectors. Set both load switches to the appropriate 70V or 100V value. The rated power into the mono load will be double the rating for a stereo load. See diagram

PROTECT

The red "Protect" LED on the front panel indicates that the NOMAD protection circuit has been activated, and is limiting the output power of the amplifier. Typically this may only occur when a transient signal corresponds to a “dip” in the speak- ers’ impedance curve, and will not cause significant clipping distortion. However, if the nominal speaker impedance is sig- nificantly lower than the Load Switch setting, excessive clip distortion can result, accompanied by continuous or prolonged illumination of the protect LED. In this situation the Load Switch should be changed to a lower value until the “protect” events occur infrequently. See “Load Switch” paragraph.

LOAD SWITCH

The Load Switch-located on the front panel-allows the amplifier’s power supply to be matched to the speaker load for more efficient, cooler running operation. The power output and thermal performance of the amplifier remains consistent with all the possible combination of the loads listed. In Stereo or Biamp mode the Load switches can be configured independently, and each channel will deliver the same consistent output power and thermal performance, regardless of how the other channel is configured. Use the following guide when selecting the Load Switch setting:

Nominal Speaker Impedance	Load Switch Setting
5Ω-8Ωor higher	8Ω
3Ω-5Ω	4Ω
2Ω-3Ωor lower	2Ω

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