Electro-Voice SBA750 Status Indicators, Power Switch, AC Fuse, AC Connector, Electro-Voice

Status Indicators

These indicators provide information about the actual operational state of the SbA750’s internal power amplifier.

Signal Indicates that an audio signal is present at the input and that it is output.

Limit When lit this indicator signals that the internal power amplifier actu- ally operated at the threshold of clipping. Short-term blinking is not critical, because the amp’s audio limiter keeps distortion under control, so that the sound is unaffected. Input overdrive, which results in sound degradation, is a probable cause for a continuously lit indicator. To prevent this from happening, reduce the input level.

VCP Lights when the power amplifier’s “Voice-Coil-Protection” is activated. During dynamic peaks the integrated power amplifier is capable of produc- ing output levels that exceed its stated nominal output capacity. Therefore, the SbA750 employs a VCP circuit (Voice-Coil-Protection), which simulates the thermal behavior of the speaker’s voice-coil, automatically reducing the energy fed to the speaker system on the occurrence of thermal overload.

Protect Lights when one of the multiple comprehensive protections, e.g. against thermal overload, HF, DC or Back-EMF of the power amplifier is activated. Preventing the woofer from being damaged, it is shutoff via relays in the protect mode. Additionally, the input level is being reduced. During power-on the PROTECT LED lights for approximately 2 seconds, which is normal. This only indicates that all protection circuitry has been activated properly.

Power Switch

AC switch for switching the SbA750’s power ON or OFF. The switch lights after turning the power ON. Make sure that the AC cord is correctly connected if the switch is not lit upon turning the power on. If the AC cord is correctly connected and the AC switch does not light upon power-on, please contact your local dealer.

AC Fuse

During normal operation the AC fuse of the SbA750 only blows at the occurrence of a malfunction. Exchanging the fuse is only permissible using a fuse of the same type (current, voltage and release characteristic). In case the fuse blows frequently, please contact your local dealer.

AC Connector

AC connection is established via a PowerCon connector. A 15’ (5m) long AC cord with PowerCon plug is supplied.

CAUTION: THIS APPLIANCE HAS NO USER-SERVICABLE PARTS INSIDE. LEAVE ANY SERVICING AND MAINTENANCE QUALIFIED SERVICE TECHNICIANS ONLY.

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