21
dm88 Specifications
Power
Power output into 4 ohms resistive > 500 W.
Power output into 8 ohms resistive > 270 W.
Distortion
(Footnote 1)
At full power output, all harmonic distortion
orders:
THD <-126 dB (<500 parts per billion) up to
20 kHz (100 kHz B.W.) at 500 W into 4 ohms.
THD @ 1 kHz <-140 dB (<100 parts per billion).
For sum of 19 and 20
kHz tones, each
delivering 100 W into 4 ohms = peak power
500W, intermodulation products each
<-126 dB relative to output.
SMPTE-IM intermodulation products each
<-126 dB relative to output.
Inputs
There are four input modes:
•
an unbalanced voltage mode input with
an impedance of 100 kohms
•
a balanced voltage mode input with an
impedance of 100 kohms + 100 kohms
•
a current-mode input with a 60 ohm input
impedance to minimize cable reflections
(to be fed from an infinite impedance
current source)
•
a minimal path voltage mode with an
input impedance of 660 ohms
The voltage gain of the balanced and
unbalanced inputs is 60 V/V and 30 V/V for
the minimal path mode. The gain of the
current mode is 9 V/mA.
Noise
The equivalent input noise at the input is
5
nV/sqrt(Hz) for the voltage modes and
6 pA/sqrt(Hz) for the current mode.
Slew rate limit
Maximum slew rate for both small signal and
maximum output voltage is 100V/
µ
s (which is
equivalent to a maximum output voltage at
approximately 250 kHz).
Power supply
(Footnote 2)
•
active power factor correction minimizes
mains current harmonic distortion
•
operates at all voltages from 85 to 270 V
r.m.s. 45-65 Hz, without any internal or
external switches
•
less than 100 parts per million mains hum
and ripple on the amplifier power rails
•
conforms with PFC and EU emission
standards set for 2002
