SPECIFICATIONS QW
™
-4
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Low frequency - high frequency:
1,200 Hz
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Low frequency:
delay 0.34 ms
High frequency: 0.00 ms
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Full range:
Nominal:
4.0 Ω
Minimum:
3.4 Ω
Low frequency:
Nominal:
4.0 Ω
Minimum:
3.5 Ω
High frequency:
Nominal:
8.0 Ω
Minimum:
7.1 Ω
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Two 4-pin Neutrik
®
Speakon
®
jacks in
parallel for full range input, one 4-pin
switching Neutrik Speakon jack with a
normal 4-pin Speakon jack in parallel
with the driver side for bi-amp inputs.
Second jack allows daisy chaining when
bi-amping.
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0.720" plywood finished in black
Hammer Head
™
Polyurethane
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Optional flying version available
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Front:
49.25" x 21.13" x 22.69"
1251 mm x 537 mm x 576 mm
Rear:
49.25" x 13.78" x 22.69"
1251 mm x 350 mm x 576 mm
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136 lbs.(61.8 kg)
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• 2,800 W program, 5600 W peak
• Very low power compression
• Quadratic Throat Waveguide
™
Technology
• Double 15" Pro Rider
™
woofers with
4" VC
• 44XT
™
4" titanium compression driver
• Low distortion at high SPL
• SoundGuard
™
44 tweeter protection
• Trapezoidal enclosure design
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The QW
™
-4 has two of the new extra-
high power Pro Rider
™
woofers
incorporated, as well as a new compact
cabinet design. The QW
™
-4 is a quasi-
three way speaker system comprised of
two 15" Pro Rider
™
woofers with a
Kevlar
®
impregnated cone, and an 44XT
™
compression driver loaded onto a
CH
®
942qt constant directivity horn.
The QW
™
-4 has a trapezoidal shaped
enclosure, which reduces the build-up of
standing waves inside the enclosure,
which minimizes mid-bass and mid-
range coloration’s due to the cabinet. It
is constructed of premium .720"
plywood and is covered with a tough,
durable black textured Hammer Head
™
polyurethane coating. A 16 gauge
powder-coated perforated metal grille
covers the front of the system to protect
the speakers from external damage.
The quasi-three way system is
comprised of double 15" Pro Rider
™
woofers with Kevlar
®
impregnated water-
resistant treated cones and dust cap for
superior environmental stability.
Capable of over 1,200 W total of
continuous power handling (AES Std 2-
1984), the Pro Rider woofers together
can handle a lot of sheer power. The
high frequencies are handled by a 44XT
™
4" titanium diaphragm compression
driver, utilizing ferrofluid cooling,
coupled to a CH
®
942qt constant
directivity horn Utilizing Quadratic
Throat Waveguide
™
technology, the
CH
®
942qt is protected under US Patent
6,059,069, and due to this patented
geometry, the horn has lower distortion
than many popular CD horns. The 44XT
driver features the Radialinear Planar
Phase Correction System, under US
Patent 6,064,745, which provides
smoother and extended high frequency
response.
Input connection to the system is made
via two 4-pin Neutrik jacks in parallel,
and a 4-pin Neutrik switching jack is
provided for bi-amping flexibility while
maintaining superior signal integrity.
The inclusion of a standard 4-pin Neutrik
jack in parallel on the driver side of the
bi-amp switching jack provides for daisy
chaining to another cabinet when bi-
amping.
The internal passive crossover features
Sound Guard
™
44 tweeter protection
circuit, and an advanced topology
crossover with high performance
components, to provide high power
handling and reliability. Peavey’s
proprietary high-frequency driver
protection circuitry, Sound Guard
™
,
provides long and medium term driver
overload protection when the system is
used full-range, without impairing
musical transients or dynamics. The
crossover provides driver roll-off and
protection, as well as driver EQ for the
woofer and horn, the sum total is a
clean, clear and smooth response. High-
quality, reliable crossover components
include polypropylene capacitors, and
high current inductors. The optimal
integration of the crossover with the
selected drivers results in a smooth
frequency response from 50 Hz to
18 kHz.
Despite it’s compact dimensions for a
double 15" based enclosure with a 2"
throat compression driver, this system
can put out some extremely serious
sound levels, and take 2,800 Watts
program of clean amplifier power,
resulting in precise coverage with
excellent clarity and high reliability.
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This measurement is useful in
determining how accurately a given unit
reproduces an input signal. The
frequency response of the QW
™
-4 is
measured at a distance of 1-meter using
a 1 Watt (into the nominal impedance)
swept-sine input signal. As shown in
Figure 1, the selected drivers in the
QW
™
-4 combine to give a smooth
frequency response from 50 Hz to
18 kHz.
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There are many different approaches to
power handling ratings. Peavey rates
this loudspeaker system’s power
handling using a full-range form of the
AES Standard 2-1984. Using audio band
20 Hz to 20 kHz pink noise with peaks of
four times the RMS level, this strenuous
test signal assures the user that every
portion of this system can withstand
today's high technology music. This
rating is contingent upon having a
minimum of 3 dB of amplifier headroom
available.
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Second and third harmonic distortions
vs. frequency are plotted in Figures 3
and 4 for two power levels. Ten percent
(10%) of rated input power and either
one percent (1%) of rated input power
or one watt, whichever is greater.
Distortion is read from the graph as the
difference between the fundamental
signal (frequency response) and the
desired harmonic. As an example, a
