Rockford Fosgate PUNCH PR-250 IIR User manual

PUNCH PR-250 IIR
INSTRUCTION MANUAL

Dear Customer:
Congratulations on your purchase of America’s finest car audio components. At Rockford
Fosgate we are committed to musical reproduction at its best, and we are pleased you chose
our product. Through years of engineering expertise, hand craftsmanship and critical
testing procedures we have produced a wide range of products that reproduce music
with
all the clarity and richness you deserve.
For maximum performance we recommend you have your new Rockford Fosgate product
installed by an Authorized Rockford Fosgate Dealer, as we provide specialized training
through Rockford Technical Training Institute (RTTI). The length and nature of your
warranty are dramatically affected if you install the product yourself. Please read your
warranty and retain your receipt and original carton for possible future use.
For your musical enjoyment, Rockford Fosgate offers everything from two channel
Punch
®
amplifiers, the more powerful four channel Power amplifiers, to three lines of
speakers: Pro Series, The Punch
®
, and Series One
™
. In addition, we offer two-, three- and
four-way speaker systems, and subwoofer and full range enclosures. For sound reproduc-
tion at its best, we offer signal processors: equalizers, pre-amps, and crossovers.
To insure overall installation quality, Rockford provides top quality wire, connectors,
carpet, grille cloth, “Colours” speaker grilles and amplifier shrouds, high output
alterna-
tors, and many more accessories through our Perfect Interface division.
To add the finishing touch to your new Rockford Fosgate image, order your Rockford
P.0.P. which includes everything from t-shirts and jackets, to key chains and neon hats.
To get a free brochure on Rockford Fosgate products and Rockford P.O.P., please call 602-
967-3565 or FAX [phone].
And Remember. . .
PRACTICE SAFE SOUND™
CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER 100dB
MAY CAUSE PERMANENT HEARING LOSS. HIGH-POWERED AUTOSOUND
SYSTEMS MAY PRODUCE SOUND PRESSURE LEVELS WELL OVER130dB.
USE COMMON SENSE AND PRACTICE SAFE SOUND.

IN CASE OF DIFFICULTY
PROBLEM
Short Stop
Circuit
Activated
Fuse Blows
Noise Pickup
From Alternator
Or ignition
Distorted Sound
Overheating
CAUSE/CURE
1. Speaker wires shorted or grounded to each other or car
body.
2. Less than 3 ohm speaker load.
3. Power ground incorrect.
4. Recheck installation instructions.
1. Power and ground wires reversed.
2. Unit incorrectly wired: refer to diagram.
3. Recheck installation checklist.
1. Run power lead (direct to “+” battery terminal).
2. Black ground wire should be grounded close to where
power-amp is mounted. Must be good solid ground.
3. Radio modified incorrectly for hi-impedance output. Shield
must not touch case, only ground side of volume control.
4. Dress audio cables away from large power and ground
wires, or automobile cabling.
5. If noise only happens on tape player, it’s possible the noise
is being induced directly into the tape head from automo-
bile wiring. Re-locate.
6. Insert choke in power lead to radio/tape unit. In stubborn
cases, try noise suppression at the source alternator and
ignition coil.
7. When all else fails, insert a high current choke, Fosgate
part #FA-505, in the power lead to battery.
8. Recheck installation checklist.
1. Check for shorted or grounded speaker wires.
2. If input signal is large, the input level control may have to
be adjusted.
3. If there is a wiring problem, the unit may be oscillating and
causing the power supply to go into overload protection.
4. When this happens, the L.E.D. indicatorwill be dim. Check
wiring per diagram.
5. Recheck installation checklist.
1. Lower than 3 ohm load.
2. Re-mount for better air flow.
3. Too small wire to battery.
4. Recheck installation checklist.

DESCRIPTION
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 boxy” sound.
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.
SHORT STOP
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.
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INSTALLATION
Experience has proven that only technically inclined users who
have the proper tools and mechanical ability should attempt to
install the unit themselves.
If you do not feel confident or if you have an unusual installation
situation, have the unit professionally installed.
IMPORTANT: To prevent alternator and ignition noise pickup,
the power and ground connections MUST be wired exactly as
indicated in the Power and Ground Sections on pages 3 and 4.
Do not run the ground connection direct to the battery.
MOUNTING
The PR-250 IIR comes in two parts. The preamp equalizer is
miniaturized so it can be mounted underdash or in dash and not
lookout of place. The power amplifier is intended to be mounted
where it is out of sight. When considering locations for mounting
the power amplifier, keep in mind that it dissipates a considerable
amount of heat and must be mounted horizontally.
Never mount in a confined area or with the heatsinks directly
against any other surface, since this will cause damage to the
unit from excessive temperatures.
NOTE: Units that fail when improperly mounted will not be
repaired under warranty.
After the desired mounting locations have been found, mount
with the #8 sheet metal screws provided.
SPEAKER MOUNTING
~The speakers you select and the way you install them will
~
determine to a great extent how the system will sound. The
~ Punch has a considerable amount of low frequency boost
~ available and even fairly small diameter speakers will sound
~ good. However, the larger the diameter, the greater the power
that can be produced in the low bass range. Where possible use
6” x 9” or 8” round speakers or larger. It’s very important to use
speakers with a wattage rating large enough to prevent speaker
damage (50 watts RMS is recommended).
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