Specifications

page 29
Studio Reference I & II Professional Studio Amplifiers
Operation Manual
7 Specifications
7.2 Maximum Power Specifications
Shown in Figures 7.3 and 7.4, Crown’s maxi-
mum power specifications represent the largest
amount of output power you can expect from
your amplifier when it is driven to full output
under the given conditions. These specifications
can be used to prevent loudspeaker and hearing
damage.
The maximum power matrices include specifica-
tions for single cycle and 40 millisecond burst
sine waves. Burst signals act like large transient
peaks that are present in common source sig-
nals. Loudspeakers can respond to a single
cycle burst, so the single cycle burst specifica-
tions should be used to help you protect your
loudspeakers. In contrast, a 40 millisecond burst
represents the typical response time of the
human ear. Your ear will not respond to the
entire dynamic change of a burst that lasts less
than 40 milliseconds.
The burst power specifications are provided at
0.05% THD which is a practical low distortion
condition. Operating the amplifier at levels
higher than 0.05% THD can result in output
power levels that are higher than those listed in
the maximum power matrices.
Maximum Power Notes:
All maximum power specifications are based on
0.5% regulated AC mains with THD of less than
1.0% and an ambient room temperature of 70° F
(21° C). Although it is an unusual condition,
your amplifier can function well with AC mains
voltages up to 10% over the specified line volt-
age. With overvoltage conditions, your amplifier
may be capable of delivering instantaneous
power levels up to 20% greater than the specifi-
cations in the matrix.
1. A single cycle sine wave is presented to the
amplifier and monitored for nonlinear distortion.
The average power during the burst is reported.
Loudspeakers must be able to withstand this
level if they are to be safely used with this ampli-
fier.
2. A 40 millisecond sine wave burst (10 percent
duty cycle) is presented to the amplifier and
monitored for nonlinear distortion. Average
power during the burst is reported. This power
level is a measurement of the amplifier’s maxi-
mum transient power that can be perceived by
the human ear.
Figure 7.3 Studio Reference I Maximum Power Matrix