Bridged Operation; Noise Gate Option - Bose ENTERO 8100 Manuel De L'installateur

12.3 Bridged Operation

13. Noise Gate option

Channels can be used in BRIDGE mode. Channel 1 and 2 and channel 3and 4 can be used as an
independent channel pair.
ENTERO 8100/4700
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Switch the amplifier off. The input signal should be wired to the first channel of the channel pair in the
regular mode and wired to the second channel in inverse mode (the positive pole to the negative pin
and the negative pole to the positive pin).
The amplified signal is available at the positive pins of both channels of the channel pair (positive pin
of channel 1 and positive pin of channel 2). Be careful to make these connections in the proper way.
The load impedance for the bridged operation is between 4 and 16 Ohm for the ENTERO
between 8 and 16 Ohm for the ENTERO
If EQ cards are required, see chapter 10.5; each channel needs its own EQ card.
ENTERO 4250/4500
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Switch the amplifier off and set the respective DIP switch to BRIDGED. The input signal for a channel pair
should be fed to the first input connector (channel pair 1 and 2: input 1, channel pair 3 and 4: input 3).
The output signal is available between the positive output pins of both channels (output signal of
channel 1 and 2 at 1+ and 2+, output signal of channels 3 and 4 at 3+ and 4+).
The load impedance for the bridged operation is between 4 and 16 Ohm.
If EQ cards are required, see chapter 10.5; each channel needs its own EQ card.
The ENTERO power amplifier is equipped with a noise gate option to avoid reinforcing noise fed to the
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amplifier input by the input signal chain. The noise gate can be switched on or off. All noise gate options
are selectable through the DIP switch at the rear panel of the amplifier.
The threshold for the noise gate is nominally set for an input signal of -54dBu and can be switched to an
input signal of -48dBu.
Noise Gate Parameters:
NG Nominal Threshold: -54dBu RMS input signal
NG Optional Threshold: -48dBu RMS input signal
NG Tail Time: 4 seconds
NG Attack Time: max. 500us, typically 200us
NG Active Attenuate: -90dB
The noise gate settings can be changed under regular amplifier operation without switching the unit off.
DIP SW 3: On=NG Enabled
DIP SW 4: On=NG Threshold +6dB
13. Noise Gate option
4700.
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OFF=NG Disabled
OFF=NG Threshold Nominal
8100 and
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