Diagnostics Table - dB Technologies OPERA SUB 15 Mode D'emploi

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DESCRIPTION

The OPERA SUB 15 speaker features an 15" woofer with an amplifier able to deliver

800W (RMS).

The subwoofer speaker is made using "BAND PASS" so high sound pressures can be

achieved in compact dimensions. Being made of poplar wood, weight is reduced and

handling is easier.

The OPERA SUB 15 diffuser is an active sub-woofer that has been designed to function in

stereo (fig. 1) and in mono (fig. 2) modes.

This sub-woofer is ideal for sounding medium-sized rooms using a pair of diffusers from the

OPERA (212-215) connected in stereo mode or for installations requiring greater sound

pressure, such as those in the open-air, two OPERA SUB 15 diffusers should be used

together with two OPERA (412- 415) diffusers connected in mono mode.

Esempio : 2 x OPERA 212/215

1 x OPERA SUB 15

FEATURES

Microprocessor

The OPERA SUB 15 amplifier features a processor for managing and controlling the light

indicators (POWER, STATUS, SIGNAL) and the control/protection circuits to ensure

correct system operation.

Cooling

Amplifier cooling is ensured by a fan controlled by a circuit that automatically regulates

speed in relation to any increase in temperature inside the amplifier.

The four speeds, including stand-by, optimize cooling and ensure reduced forced cooling

noise levels.

For best speaker use, always make sure the amplifier is properly ventilated and never

block the ventilation grilles.

CUTOUTS

Thermal cutouts

Thermal cutouts trip whenever the temperature inside the amplifier overheats

(temperature >90°).

Such tripping of the thermal cutouts is indicated by the slow flashing of the "STATUS"

indicator light and by a "mute" status audio signal (see diagnostics table).

Esempio : 2 x OPERA 412/415

2 x OPERA SUB 15

FIG. 1

Also featured is a circuit that controls the temperature of the toroidal transformer and

protects this against even the most exasperated operating conditions. If this cutout trips,

then the equipment is being used at the limits of its characteristics.

Such tripping is indicated by the fast flashing of the "STATUS" indicator light and by the

"mute" status audio signal (see diagnostics table).

All functions restart automatically when normal operating temperature is achieved.

Restart times can be fairly long, especially when the thermal cutout of the transformer

trips because the core takes a long time to dissipate the accumulated heat.

CC/DC/RFI

The amplifier features a short-circuit cutout for each output. This cutout places the output

signal of the stage involved in "mute".

The amplifier features relays on the audio outputs. These devices protect the speakers in

case of direct current, radio disturbances, subsonic frequencies and have an anti-bump

function at amplifier switch-on.

Tripping of these cutouts is indicated by the "POWER" indicator light going off and by the

different flashing sequences of the "STATUS" indicator light (see diagnostics table).

The amplifier will start operating normally again when the cutout condition is eliminated.

Power voltage

The amplifier features a circuit that ensures correct speaker operation in case the mains

power voltage is too high.

If the power voltage exceeds a max pre-established value (+15%) for a short time (power

peak), the fault will be indicated by means of the "POWER" indicator light, which will flash

quickly for about 10 seconds (see diagnostics table).

If the power voltage stabilizes at high levels, the amplifier will become disabled.

If the power voltage drops below the minimum established value (about -20%), the fault

will be indicated by means of the "POWER" indicator light which will start flashing slowly

(see diagnostics table).

This function is also useful in case of inadequate power supply wiring.

FIG. 2