Third Harmonic: | |
200 Hz: | 5.25% |
1 kHz: | 0.31% |
Recommended active crossover frequency region and slope:
Mid Frequency to High Frequency: 1,000 Hz at 18 dB/octave
Time Offset: | |
Mid Frequency: | 0 ms |
High Frequency: delay 0.813 ms |
Impedance (Z): | |
Mid Frequency: | |
Nominal: | 4 Ohms |
Minimum: | 4.2 Ohms |
High Frequency: | |
Nominal: | 8 Ohms |
Minimum: | 5.4 Ohms |
Input connections:
2xNL4MP bi-amp MF and HF inputs in parallel
Enclosure materials and finish: 0.720 plywood finished in black Hammer Head™ hard coating
Mounting provisions:
(12) 3/8"-16 threaded mounting suspension points (three each top and bottom and two each side and back). Use only forged shoulder machinery eye bolt, Mil Spec MIL51937-3.
Dimensions (H x W x D): Front:
48.5" H x 21.0" W x 30.38" D 1232 mm x 533 mm x 772 mm Rear:
48.5" H x 10.38" W x 30.38" D 1232 mm x 264 mm x 772 mm
Net weight:
154 lbs. (70 kg)
Features
•200 Hz to 18 kHz
•Patented 4" diaphragm titanium compression driver, ferro fluid cooled
•Patented Quadratic Throat Waveguide™
•Flexible suspension provisions
•Maximum concert power
•Designed for professional bi-amp applications
Applications
•Stadiums
•Arenas
•Multi-purpose facilities
•Cruise ships
•Theme parks
•Concerts
•Theaters
Description
The new QW-1 is designed for the top end of a three- or four-way professional high performance sound system. When used in conjunction with the QW-215 and QW-218, in four-way applications, the sound pressure levels of a single four-way can reach SPLs of 140 dB continuous. The power handling of this system in four-way applications approaches 6800 Watts program. Due to its high efficiency drivers, the QW-1 has a rating of 1200 Watts program for the mids, with a 44XT™ rated at 200 Watts program (band limited
1000 Hz to 20 kHz). For reference, the QW-215 is rated at 2400 Watts program and the QW-218 is rated at 3200 Watts program.
The QW’s patented CH®-642qt horn is loaded with the patented 44XT high efficiency compression driver and a BWX 1008-8 HE high powered mid, designed specifically for the QW-1. The horn has a coverage pattern of 60˚ in the horizontal axis and 40˚ in the vertical axis.
The QW-1 is designed for arraying in flying applications or stacking on a stage. Twelve mounting points are located on the unit for flying applications. Three flying points are located on the top and bottom, and two points are on the right and left sides and the rear of the enclosure.
The QW-1 is constructed with a special grade of high density 3/4" plywood and covered with a black Hammer Head hard coat, a tough finish equivalent to the durable liners used in truck beds today. This finish makes the enclosure very road- worthy, but more importantly the Hammer Head finish helps to dampen resonant modes that may develop. These minor, subtle resonant modes are dampened to help improve the overall sound quality of the system.
Frequency response
This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the QW-1 is measured at a distance of
1 meter using a 1 Watt swept-sine input signal (into the nominal impedance). As shown in Figure 1, the selected drivers in the QW-1, in conjunction with the Peavey CEX 5, combine to give a smooth frequency response from 200 Hz to 18 kHz.
Directivity
Beamwidth is derived from the -6 dB points from the polar plots (see Figure 2), which are measured in a whole space anechoic environment. Q and Directivity Index are plotted for the on-axis measurement position. These specifications provide a reference to the coverage characteristics of the unit and insight into proper placement and installation in the chosen environment. The combination of components in the QW-1 exhibit a desirable beamwidth and directivity (Figures 2 and 3) suitable for sound reinforcement applications.
Power handling
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, our strenuous testing assures that every portion of this system can withstand today’s high technology music. This rating is contingent upon having a minimum of 3 dB amplifier headroom.
Harmonic distortion
Second and third harmonic distortions vs. frequency are plotted in Figures 4 and 5 for two power levels: ten percent (10%) of rated input power and either one percent (1%) of rated input power or 1 Watt, whichever is greater. Distortion is the difference between the fundamental signal (frequency response) and the desired harmonic. For example, a distortion curve down 40 dB from the fundamental is equivalent to 1% distortion.
