The following power amplifiers have a provision for installing a supervision control board

LBB-4421/10, LBB-4422/10, LBB-4424/10, PRS‑1P500, PRS‑2P250, PRS‑4P125

Required loudspeaker line characteristics

Preferred cable

Single twisted pair, 0.75 mm² to 1.5 mm²

Maximum length

1 km (including branches, max. 300 m adjacent to other supervised loudspeaker cables)

Maximum loop resistance

38Ω

Maximum inductance

750 µH

Minimum total

50 Ω @ 70 kHz (independent of amplifier power)

Maximum capacity

300 nF

Maximum number of supervision boards per amplifier channel

80 @ 500 W

40 @ 250 W

20 @ 125 W

Loudspeaker voltage

70 V, 100 V

Operating temperature

-5ºC to +55ºC (23 to 131ºF)

Storage temperature

-20ºC to +70ºC (-4 to 158ºF)

Humidity

15% to 90%

Air pressure

600 to 1100 hPa

Mounting

Internally in the power amplifier Plastic brackets for horizontal and vertical installation included

Dimensions

60 x 50 x 17 mm without bracket

Weight

30 g