18 kHz, Frequency response, KHz Power handling

SPECIFICATIONS QW™-2

Crossover frequency (internal passive): Low frequency - high frequency: 1,200 Hz

Time offset:
Low frequency:	delay 0.27 ms
High frequency:	0.00 ms
Impedance (Z):
Full range:
Nominal:	8.0 Ω
Minimum:	6.2 Ω
Low frequency:
Nominal:	8.0 Ω
Minimum:	6.5 Ω
High frequency:
Nominal:	8.0 Ω
Minimum:	7.1 Ω

Input connections:

Two 4-pin Neutrik® Speakon® jacks in parallel for full-range input. One 4-pin switching Neutrik Speakon jack features a normal 4-pin Speakon jack in parallel with the driver side for bi-amp inputs. The second jack allows daisy chaining when bi-amping.

Enclosure materials and finish: 0.720 in. plywood finished in black Hammer Head™ Polyurethane

Mounting provisions:

This unit is not designed for overhead suspension; however, an optional flying version is available.

Dimensions (H x W x D): Front:

33.38" x 21.13" x 22.59"

848 mm x 537 mm x 574 mm Rear:

33.38" x 13.78" x 22.59"

848 mm x 350 mm x 574 mm

Net weight:

98 lbs. (44.5 kg)

Features

•1,600 W program, 3,200 W peak

•Very low power compression

•Quadratic Throat Waveguide™ technology

•15" Pro Rider™ woofer with 4" VC

•44XT™ 4" titanium compression driver

•SoundGuard™ 44 tweeter protection

•Low distortion at high SPL

•Trapezoidal enclosure design

•SA-1 stand adaptor

Description

The latest high performance loudspeaker system from Peavey, the QW-™2 has the new extra-high power

Pro Rider™ woofer incorporated, a new Quadratic Throat Waveguide™ horn, as well as a very nice looking new cabinet design. Its trapezoidal shape reduces the build-up of standing waves inside the enclosure, minimizing mid-bass and mid-range colorations 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. An SA-1 stand mount adaptor is built-in for ease of speaker stand use.

The two-way system is comprised of a 15" Pro Rider™ woofer with a Kevlar® impregnated, water-resistant treated cone and dust cap for superior environmental stability. Capable of over 600W of continuous power handling (AES Std 2-1984), the Pro Rider woofer 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 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 Sound Guard high-frequency driver protection circuitry provides long and medium term driver overload protection when the system is used full-range, or when it is bi-amped, 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 52 Hz to

18 kHz.

Despite its compact dimensions, this system puts out some serious sound levels. A 1,600 Watts program of clean amplified power can result in precise coverage with excellent clarity and high reliability. Very low power compression and very low distortion combine to provide a clean, dynamic, yet punchy sound.

Frequency response

This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the QW-2 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-2 combine to give a smooth frequency response from 52 Hz to

18 kHz.

Power handling

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.

Harmonic distortion

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 distortion curve that is down 40 dB from the fundamental is equivalent to 1% distortion.