Frequency response
This measurement is useful in
determining how accurately a given
unit reproduces an input signal.
The frequency response of the
SP 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
SP 4 combine to give a smooth
frequency response from 52 Hz to
17 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 & 4 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 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.
Mounting
This unit is not designed for
overhead suspension. Four large
rubber feet are included on the
bottom for floor use.
Architectural & Engineering
Specifications
The loudspeaker system shall have
an operating bandwidth of 52 Hz
to 17 kHz. The nominal output level
shall be 100.0 dB when measured
at a distance of 1 meter with
an input of 1 Watt. The nominal
impedance shall be 4.0 ohms.
The maximum continuous power
handling shall be 1,000 Watts, with
maximum program power of 2,000
Watts, peak power input of at
least 4,000 Watts and a minimum
amplifier headroom of 3 dB. The
nominal radiation geometry shall
be 90 degrees symmetrical about
the center axis in the horizontal
plane, and +10, -30 degrees about
the center axis in the vertical plane.
The outside dimensions shall
be 48.75 inches high by 20.88
inches wide by 23.00 inches deep.
The weight shall be 113 lbs. The
loudspeaker system shall be a
Peavey model SP
™
4.
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.
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
1
2
3
5
10
20
30
50
100
Impedance
Z
( )
Figure 2
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
60
70
80
90
100
110
dB
SPL
(re
20
Pa)
Amplitude Response (1W 1m On-Axis)
Figure 1
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
40
50
60
70
80
90
100
110
dB
SPL
(re
20
Pa)
Harmonic Distortion : 1% Rated Power
Figure 3
3rd Harmonic
2nd Harmonic
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency (Hz)
50
60
70
80
90
100
110
120
dB
SPL
(re
20
Pa)
Harmonic Distortion : 10% Rated Power
Figure 4
3rd Harmonic
2nd Harmonic
