Precision Power 356cs, 355cs User Manual
Component Speakers
355cs 356cs
TABLE OF CONTENTS
introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
about this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
installation planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
amplifier requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
mounting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
crossover features and connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
speaker wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
speaker installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
tweeter installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
crossover installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
connecting the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
crossover connections and input switch setting . . . . . . . . . . . . . . . . . . . . . . . . 19
bi-amplified connections to crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
bi-wire connections to crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2
INTRODUCTION
Thank you for choosing PrecisionPower™ automotive component loudspeakers.
These reference quality speakers combine the acoustic excellence achieved from
25 years of loudspeaker research and development, with innovative and timeless
industrial design, and cutting edge material choices. Tuned for precise reproduction
of the supplied musical signal, they accurately deliver every nuance and detail
while retaining the classic "PrecisionPower™ sound" that has enchanted multiple
generations of owners. With a minimum of care, this high performance component
speaker system will deliver years of trouble-free satisfaction.
about this manual
To achieve optimum performance from your PrecisionPower™automotive
component loudspeakers, we recommend that you read this manual thoroughly
before installation and use. For the best results and support, please consult
with your local authorized PrecisionPower™ retailer. Technical support is also
available from PrecisionPower™ at 1-800-753-0800 selection 3. Keep this
manual in a safe place for future reference.
features
Molded woofer basket - The backbone of any good woofer is its basket. It provides
the proper alignment and support structure for the magnet and moving parts while
the very thin braces guarantee a minimum of early reflections off the basket that
would be ordinarily transmitted as sonic colorations through the cone.
Woofer cone - Interlaced Aramid Fiber (Kevlar) with Mica and fiberglass mixture
in a IMPP (Injection Molded Poly Propylene) base, cones provide the perfect
combination of rigidity and low moving mass for ultra-low distortion and superior
transient response.
Vented voice coil - Magnet cooling vent construction enhances power handling
capabilities of the woofer. The voice coil is made using copper clad aluminum wire
to minimize weight and increase efficiency and low frequency response.
Extended center pole - Woofer magnet geometry provides a symmetrical magnetic
pattern to reduce THD.
Tweeter - Ultra-light silk dome design is treated with polymer compound to control all
non-linear resonances.
Multi-mount tweeter - The following mounting options (surface, angled surface,
flush, or angled flush) are supplied to mount the ferrofluid cooled neodymium
tweeter.
3
Tweeter level control - A three-position switch adjusts the volume of the tweeter
with respect to the midrange.
Tweeter phase switch - A two-position switch which allows 180° or 0° phase
difference between the tweeters and midranges.
Midrange contour control - A two-position switch offers a frequency response
correction circuit to adjust for flat frequency response in the car on axis or off
axis.
Bi-amplifiable/ bi-wirable - The passive crossover supplied with this system is biamplifiable or bi-wirable; typically only available in high quality audiophile home
loudspeakers.
Solid state tweeter protection - Advanced protection circuitry provides protection
for the tweeter against overpowering or amplifier clipping.
4
CAUTIONS
Study your automobile thoroughly before you drill or cut any holes. Take extra care
when working near gas tanks, gas lines, brake or hydraulic lines and electrical
wiring.
Wear eye and ear protection when using power tools. Keep the woofers and
tweeters away from metal filings and shavings. Once foreign objects are stuck to
the magnets or tweeter dome, it will be virtually impossible to remove them. Keep
the tweeters in their protective bags until final mounting to prevent any possibility
of metal dust or chips from passing through the grille and accumulating on the
dome.
Exercise caution when working with the cs series with the grille removed. A slip of
the hand with a screwdriver or other tool can result in irreparable damage to the
cone or dome. Do not touch the cone or dome.
Do not install the components where they will be subject to excessive heat,
moisture or dust, or where they will be kicked or repeatedly bumped or brushed.
Make absolutely sure that the woofer is connected to the lowpass output and the
tweeter is connected to the highpass output of the crossover network. If these
connections are reversed, low-frequency signals will be fed to the tweeter without
fuse protection. In this case, the tweeter may be damaged, such damage is not
covered by the warranty.
When removing or installing the grills be careful not to brush the woofer's rubber
surround or the tweeter's dome with the edge of the grille. Cutting or tearing the
surround or dome will destroy the unit.
Never run wires outside or beneath the vehicle where they can be snagged by
road hazards or the moving parts of the vehicle. Use existing wire channels,
sills, panels and molding strips inside the automobile to hide the wiring for neat
appearance and safety.
Make sure your radio/cassette/cd player and or other equipment is turned off
while connecting the speaker terminals. Turn on the various components and
slowly advance the volume control ONLY after checking and double checking all
connections.
NOTE: If the sound is weak or distorted, immediately turn down the volume and
see the section entitled Troubleshooting.
5
installation planning
Proper installation planning is the best way to maximize performance. By planning
your installation carefully you can avoid situations where the performance or
reliability of your system is compromised. Your authorized PrecisionPower™
dealer or PrecisionPower™ audio technical support at 1-800-753-0800 selection
3 has been trained to know how to maximize your speakers sonic potential. They
are a valuable resource in helping you with your system design and installation.
amplifier requirements
This speaker system requires a minimum of 45 watts per channel to achieve
reasonable listening volumes in a moving automobile without clipping the amplifier.
PrecisionPower™ recommends no more than 150 watts per channel as a
maximum so as not to exceed the thermal or mechanical limitations of the speaker
system. Any amplifier between 45 watts and 150 watts may be used. If you choose
to use an amplifier with more than 150 watts use caution as speaker damage may
occur at high volume settings. All PrecisionPower™ loudspeakers will produce
reasonable volume levels in the automotive environment using moderate amplifier
power. However, the use of a low powered amplifier to try and attain very high
volume levels can lead to overdriving the amplifier and damaging the speaker
system. As a rule, do not turn the volume up above the point where you hear
distortion on musical peaks from either an overdriven amplifier or mechanical
noise from an overstressed speaker. For the best performance and reliability;
select an amplifier with slightly more than the maximum power you are likely to
need to generate the desired volume levels. This margin of reserve power will
ensure that the amplifier will not be routinely driven beyond its design limits.
WARNING: Excessive sound pressure level can permanently damage your
hearing. The maximum volume levels attainable with PrecisionPower™ speakers,
combined with high-power amplification, may exceed safe levels of extended
listening.
mounting locations
There are many possible choices of mounting locations. The vehicle factory
locations will usually dictate the woofer mounting position. Because of its small
size and multiple mounting options, the tweeter can go virtually anywhere.
PrecisionPower™ uses an unusually low crossover frequency for the tweeter
which means you are not restricted to mounting the tweeter close to the midrange
speaker. The tweeter can be mounted as far as 24" (60 cm) from the midrange
speaker without causing adverse effects on the sound quality. However, better
results are usually obtained by locating the tweeters and midranges relatively
close to each other, and by keeping the sound path lengths between the listener
and the left and right speakers as equal as possible.
PrecisionPower™ cannot recommend specific tweeter mounting locations for
each vehicle, but in general try to keep the tweeters as far to the sides of the car
as practical. Avoid placing them above ear level unless the woofers are also above
6
ear level. Place the tweeters in similar locations on both sides of the vehicle. Try
a few locations by just placing the tweeter or taping it in a location and listening
to ensure the desired stereo image and high frequency dispersion are achieved
before committing to a location by drilling holes in the vehicle. You should also
experiment with the tweeter phase switch settings to find the most effective
combination of location and phase.
7
SPECIFICATIONS
355cs 356cs
Frequency response 77Hz -22kHz 60Hz -22kHz
Sensitivity 86db 87db
Impedance 4 ohms 4 ohms
Recommended amplifier
50/100 60/120
power
Mounting depth (woofer)
2.5 2.5
(in)
Fs 77.28 Hz 65.96 Hz
Re 3.40 ohms 3.40 ohms
Qms 6.24 5.91
Qes 0.64 0.65
Qts 0.58 0.58
L1 .52 .5
Vas (L) 3.57 7.38
Mms (Kg) .012 .013
Cms .298 .437
BI 6.22 5.38
Xmax .11328 .11328
8
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