Rockford Fosgate PUNCH PR-250 IIR Instruction Manual page 4

DESCRIPTION
SHORT STOP
The Punch PR-250 IIR equalizer/power amplifier was designed
to provide true state-of-the-art sound in cars, vans, boats or
anywhere a 12 volt storage battery is available.
Extensive field research using spectrum analyzer and pink noise
techniques has proven that all speakers suitable for this appli-
cation roll off characteristics at one or both ends of the audio
spectrum.
Conventional tone controls can only partially correct for these
deficiencies.
Typically when the bass control setting is increased to bring up
the low bass, the mid bass is also increased. This produces a
large "mid-bass bulge," resulting in a "boomy
Treble controls rarely correct the high frequency roll off correctly
because different types of speakers start to roll off at different
frequencies and the tone control has only one curve.
The Punch has combination equalizer settings that will
complement virtually any good speaker. The overall frequency
response of your system as heard by the ear will be much
improved. Music material recorded at the same relative loudness
in lows, midrange and high will not be heard in their proper
perspective.
Your PR-250 IIR is virtually immune to blowouts from shorts or
overloads because of Fosgate's exclusive Short Stop begins
operating with computer logic to monitor the power supply output
voltage. If it fails to attain the proper level within one-quarter
second, Short Stop shuts the entire system off. It then activates
a timing circuit that restarts and stops The Punch at one-second
intervals. When the short or overload has been eliminated, your
PR-250 IIR resumes normal operation.
Short Stop performs in the same way to monitor and protect
output transistor current flowing from The Punch.
1
boxy" sound.