AKG ACOUSTICS FEATURES THE WMS 4000 BATTERY PACK AND CHARGING SYSTEM AT NSCA 2003

System Contains Two Bays Capable of Charging Two Separate Transmitters or Battery Packs Simultaneously In An Hour DALLAS, TX—March 13, 2003—AKG Acoustics will feature the BP 4000 battery pack and CU 4000 charging unit as part of its new WMS 4000 wireless system at the NSCA convention held in the Dallas Convention Center from March 13-15 in Booth #1409. One of the many significant WMS 4000 UHF wireless accessories is the CU 4000 charging unit. It features two charging bays that are designed to hold two separate HT 4000 handheld or PT 4000 bodypack transmitters or BP 4000 battery packs. The CU 4000 can charge two battery packs simultaneously in one hour if the battery packs are installed in either the HT 4000 or PT 4000 transmitters. There is no need to remove a battery pack from the HT 4000 or PT 4000 transmitters, since these products are equipped with on-board charging contacts. A three-step LED display on the CU 4000 displays the WMS 4000’s charging status. The BP 4000 battery pack is controlled by microprocessor intelligence. This feature allows for coordination of a permanent data stream between the CU 4000 charging unit and the BP 4000 battery pack. The sophisticated charging electronics of the CU 4000 charging unit allows for continual maintenance and service of the BP 4000 battery pack over the life of the battery. The BP 4000 charge balance management circuit helps to maintain an accurate assessment of the transmitter’s battery life and is transmitted by pilot tone to the SR 4000 receiver. All necessary battery pack data is stored in the BP 4000’s internal RAM or EPROM-memory that helps to maintain correct charge and recovery cycles. The BP 4000’s internal temperature circuit adjusts the energy flow to the CU 4000 charging unit to protect the batteries from excessive temperatures during charging. The charge balance management also features a self-discharging counter used to detect the battery pack’s status after a long storage period. The BP 4000 can power the HT 4000 handheld transmitter and PT 4000 backpack transmitter for up to 12 hours with one full charging cycle. Its gentle charging function will ensure up to 1,000 charging cycles. The CU 4000 basic charging function is based on a trickle charge system with inflection point switch-off automation. The safety switch off occurs by detection of the peak voltage, the negative voltage slope or a predetermined time out that prevents the battery pack from overcharging. The CU 4000 draws the user’s attention to this possible problem and suggests starting a recovery cycle. The user can activate this cycle via a recovery button on the CU 4000’s front panel. This function refreshes the BP 4000 battery pack by charging and discharging cycles to determine the actual capacity and initialize the capacity counter for accurate use-time calculation. The CU 4000 has a lockable DC connector on its rear panel that allows it to be powered by either an external DC adapter or by the optional PSU 4000 central power supply.