B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER
ACTPRO
WELCOME TO THE B-52 FAMILY
CONGRATULATIONS ON YOUR PURCHASE OF THE ACTPRO SPEAKER SYSTEM.
Please review all the information provided in this manual, to ensure that you attain the best pos-
sible sound quality out of your system.
The ACTPRO Series full-range powered loudspeakers are capable of producing rich,
clear sound at extreme SPLs. The amplifiers used in ACTPRO powered loudspeakers employ
sophisticated circuitry including acoustically tuned 4th order crossovers, four stages of equal-
ization, a built-in compressor/limiter and short circuit/over-current protection. ACTPRO Series
amplifiers have an extra high current output stage, which sets it apart from the competition,
allowing for uninterrupted extended play. All ACTPRO amplifiers are Bi-Amps with fully discrete
output stages; low frequency amplifiers employ our proprietary class G topology for high ef-
ficiency and low power consumption.
Our new ACTPRO18S subwoofer is the ultimate solution for low frequency sound rein-
forcement. These innovative active subs deliver deep, rich, chest pounding bass. At the heart of
the ACTPRO subwoofer is our proprietary class G amplifier.
ACTPRO speakers feature a rugged birch plywood construction and durable, black
Warnecke
TM
paint finish that ensures that the cabinets look as great as they sound. The ACT-
PRO amplifiers provide LED indicators for power, signal presence, limiter activation and protec-
tion mode. In addition to rear indicators a blue LED power indicator is provided on the front
grille of the cabinet.
3
HEARING DAMAGE AND PROLONGED EXPOSURE TO EXCESSIVE SPLs
B-52 speakers can produce sound levels high enough to cause permanent hearing damage to per-
formers, production crews or people in the audience. Hearing protection devices are recommended
for use where long-term exposure to high SPLs is not avoidable. Remember, if it hurts, it is definitely
too loud! Long exposures to high SPLs cause first temporary threshold shifts, limiting your ability to
hear the actual loudness and exercise good judgment. Repeated long term exposure to high SPLs
can and WILL CAUSE PERMANENT HEARING LOSSES!
Please note the recommended exposure limits (right) in Table G-16.
More information about these limits is available on the US
Government Occupational Safety and Health (OSHA)
website at: www.osha.gov