Genelec 1094A, 1092A General Description, Installation, Setting the Input Sensitivity, Drivers

Genelec 1094A and 1092A Subwoofers

General Description

The Genelec 1094A and 1092A active subwoofers are powerful low frequency loudspeakers, incorporating all the amplifier and crossover electronics needed to combine them with other loudspeakers and amplifiers.

Drivers

The 1094A contains a single 385mm (15") long throw cone driver, housed in a 110 litre vented cabinet. A cavity over the driver boosts the drivers efficiency and acoustically attenuates possible distortion components. The 1092A utilises two 210mm (8") cone drivers, housed in a 55 litre vented cabinet, and employs driver front loading.

Crossovers

The 3+1 channel active crossover within the amplifier unit filters the low and high frequency components of the

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Figure 1. Functional blocks of Genelec 1094A and 1092A Subwoofers

three front channels, dividing the input signals between the subwoofer and the main monitors. A separate subwoofer input connector allows for complete compatibility with digital 5.1 channel surround sound systems.

The crossover filter also provides calibrated ‘Bass Roll-off’ and ‘Phase’ controls, minimising the effects of the room on the performance of the subwoofer.

Amplifiers

The amplifier unit is mounted in the rear of the cabinet on quick release vibration isolators to ensure rattle free operation and long term reliability. The 1094A and 1092A amplifier output powers are 400W and 180W respectively. The amplifiers incorporate special driver protection circuitry for driver overload protection.

Installation

Before connecting the audio signals, ensure that both the subwoofer and the main monitors are switched off. Check that the subwoofer voltage selector switch is set to the correct voltage and that the correct fuse for that voltage is fitted.

Audio connections to the subwoofer are made via balanced XLR connectors. Signals from the source are fed into the subwoofer input connectors and signals for the main monitors are taken from the subwoofer output connectors. Once all connections have been made, the subwoofer and main monitors are ready to be powered up.

Setting the Input Sensitivity

The subwoofer requires input sensitivity alignment to the mixing console or other source to obtain a correctly balanced system. The input

sensitivity control is located on the rear panel of the subwoofer. An input voltage of -6dBu with a -6dBu input sensitivity setting will produce 100dB SPL @ 1m. To obtain a 110dB SPL output an input voltage of +10dBu is required when the input sensitivity is set to 0dBu.

Setting the Bass Roll-Off Switches

The acoustic response of the subwoofer may have to be matched to the characteristics of room in which it will be used. To adjust the subwoofer to match these characteristics use the ''Bass Roll-off' control switches located on the rear panel of the subwoofer. Table 1 provides some suggestions for the 'Bass Roll-off' switch settings. When both roll-off switches are 'off', a flat anechoic response results.

Each subwoofer is supplied with a	Room Type	Bass Roll-Off
		Sw1 (-2dB)	Sw2 (-4dB)
mains cable and an operating manual.
Once unpacked, place the subwoofer	Flat Anechoic Response	OFF	OFF
in a suitable position (for more details	Positioned near a wall	ON	OFF
see the 'Positioning' section).	Positioned in a corner	ON	ON

Table 1. Suggested Bass Roll-Off switch settings.