One Systems POPS 15a - Manual (Page 19)

Although POPS15a is designed for direct weather applications insure that no part
of the front of the enclosure is directed upward beyond vertical. The high-
frequency section of POPS15a is horn-loaded and water can collect in the horn’s
throat and driver if the horn is tilted upward.
EQUALIZATION AND GAIN
POPS15a has all the required equalization and gain functions included in its
internal Digital Signal Processor (DSP). Both the equalization and gain functions
have been optimized for flat frequency response and maximized system
dynamics. POPS15a does not have user-settable external gain or EQ.
All system gain should be set via the outboard mixing console. The mixing
console should be capable of providing sufficient output signal levels to supply
the necessary voltage levels to drive POPS15a to full power and still insure
adequate headroom in the mixing console. The mixing console needs to be
capable of driving 100 feet (30.5 m) of balanced cable as well as the POPS15a.
NOTE: When both POPS15a and POPSSub a are used as a system, care
should be exercised since the POPSSub a does feature an external, user-
adjustable, gain control to select the desired levels of bass and sub-bass output
relative to the POPS15a’s full-range output.
If additional equalization is required, care should be taken to avoid excessive EQ
in any band, but particularly at low frequencies. Excessive equalization can
produce “band selective” clipping and distortion. All EQ boost levels should be
monitored if system distortion is present.
Applications that require excessive low frequency equalization are almost always
an indication that a subwoofer is required. One Systems offers the POPSSub a.
POPSSub a is a companion product designed for use with POPS15a and will
provide substantial low frequency acoustic output.
DISTORTED SOUND
When desired levels exceed POPS15a’s gain structure limitations, the internal
dynamics processing functions will engage and provide system protection.
However, it is still possible to “overdrive” the input section of the system or to
overdrive, or clip the output stages of the source electronics. If distorted sound is
present the following steps should be taken:
1. Verify that the mixer’s output is not clipping or overloaded. If the output
metering section of the mixing console is continuously in the “red” then the