power, resulting in an outstanding amount
of clean coverage with amazing clarity.
Frequency response
This measurement is useful in
determining how accurately a given unit
reproduces an input signal. The frequency
response of the Quadra
™
15 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 Quadra 15 combine
to give a smooth frequency response from
64 Hz to 18 kHz.
Directivity
Beamwidth is derived from the -6 dB
points from the polar plots (see figure 3)
which are measured in a whole space
anechoic environment. Q and Directivity
Index are plotted for the on-axis
measurement position. These are
specifications that provide a reference to
the coverage characteristics of the unit.
These parameters provide insight for
proper placement and installation in the
chosen environment. The blending of the
components of the Quadra 15 exhibit a
desirable beamwidth and directivity (figure
3 and 4) suitable for sound reinforcement
applications.
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 5 and 6 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.
Architectural & engineering
specifications
The loudspeaker system shall have an
operating bandwidth of 64 Hz to 18 kHz.
The nominal output level shall be 99.0 dB
when measured at a distance of one
meter with an input of one Watt. The
nominal impedance shall be 8.0 Ohms.
The maximum continuous power handling
shall be 500 Watts, maximum program
power of 1,000 Watts and a peak power
input of at least 2,000 Watts, with a
minimum amplifier headroom of 3 dB. The
nominal radiation geometry shall be 90
degrees in the horizontal plane and 45
degrees in the vertical plane. The outside
dimensions shall be 28.50 inches high by
21.25 inches wide by 17.25 inches deep.
The weight shall be 56 pounds. The
loudspeaker system shall be an
Architectural Acoustics model Quadra 15.
3 + 2 YEAR LIMITED WARRANTY
NOTE:
For details, refer to the
warranty statement. Copies of
this statement may be obtained
by contacting Peavey Electronics
Corporation, P.O. Box 2898, Meridian,
Mississippi 39301-2898.
4
CAUTION!
PEAVEY RECOMMENDS THE USE OF NEUTRIK
™
BRAND NL4FC PLUGS TO CONNECT TO THE BI-AMP
SWITCHING JACK ON THE CROSSOVER.
USE OF OTHER BRANDS OF PLUGS MAY CAUSE AMPLIFIER AND/OR SPEAKER DAMAGE!
