RD0169 (A) KF730 & SB730 OWNER’S MANUAL Page 11 of 28
The following tables list the rms voltage limits for the KF730 and SB730. Because of their higher
impedance design, multiple KF730s and SB730s can be powered from single amplifier channels.
NOTE: The rms Voltage Limit listed for each sub-system (LF, MF/HF, SUB 1/2, or SUB 1 and
SUB 2) is the same for any enclosure quantity. The wattages are calculated using the Voltage
Limits and the overall nominal impedance for the each listed quantity of KF730 and SB730
loudspeakers.
KF730 Qty
Nominal Z
LF
MF/HF
1
16
700 W
350 W
2
8
1400 W
700 W
3
5.3
2100 W
1050 W
4
4
2800 W
1400 W
5
3.2
3500 W
1750 W
6
2.7
4200 W
2100 W
7
2.3
4900 W
2450 W
8
2
5600 W
2800 W
rms Voltage Limit:
106 V
75 V
SB730 Qty
Nominal Z
SUB 1/2 parallel
1
4 1200
W
2
2 2400
W
rms Voltage Limit:
69 V
SB730 Qty
Nominal Z
SUB 1
SUB 1
1
8
600 W
600 W
2
4
1200 W
1200 W
3
2.7
1800 W
1800 W
4
2
2400 W
2400 W
rms Voltage Limit:
69 V
69 V
CAUTION: The rms voltage limits listed above are related to the thermal limits determined from
EAW’s standard power test. In this test, transducers are “exercised” to a point of damage or
failure. The test signal has a 6 dB crest factor (peak to average ratio). A maximum continuous
voltage limit for the loudspeaker is then determined based on the test results and on the
transducer’s application in the loudspeaker. The powers listed in the table are calculated as the
square of the rms voltage limit divided by the sub-system’s nominal impedance (Z) in ohms.
5.7.2
Selecting an Appropriate Amplifier Size
The wattages listed in the above charts are intended primarily as points of comparison with the
power ratings of other loudspeakers. For this purpose, each wattage listed should be considered
as a +/-1 dB range = 0.8 to 1.25 times the wattage listed. For example, 1400 W should be
considered as a range from approximately 1100 W to 1800 W.
In many applications, the wattages listed will NOT correspond to the best amplifier sizes for
optimizing loudspeaker reliability and performance. Proper amplifier selection requires a
considered analysis for the particular application. Amplifiers should be sized according to both the
sound levels required and the type of audio signals that will be reproduced. If you are unsure of
how to determine these parameters, consult a qualified professional or contact EAW’s Application
Support Group.
