Macro-Tech 3600VZ (120 V, 60 Hz models)
Macro-Tech 3600VZ power ampliﬁer shall be a solid-state two-channel
model employing multi-mode (AB+B) grounded bridge(TM) output circuitry with a
variable impedance (VZ) power supply for each channel.
The outputs shall be switchable as stereo, bridged-mono or parallel-mono modes
of operation. The bridged-mono mode shall bridge the outputs to provide increased
output voltage. The parallel-mono mode shall parallel the outputs to provide
increased output current.
The output impedance of each channel shall be less than 10 milliohms in series with
less than 2 microhenries in stereo mode.
The variable impedance power supplies shall reduce unnecessary voltage across the
output devices by automatically switching to a parallel mode when less voltage is
required by the output circuitry and to a series mode when more voltage is required.
The ampliﬁer shall contain protection circuitry which limits the drive level placed on
the output devices before their SOA (Safe Operating Area) is exceeded. This protec-
tion circuitry shall calculate the instantaneous voltage across and current through
the output devices while factoring in their simulated junction temperatures to predict
how close they are to their operating limits. This protection will be called "ODEP."
The ampliﬁer shall contain controlled slew-rate voltage circuitry to protect it against
radio frequency interference burnouts. It shall also be protected from current over-
load at its output stage. The slew rate of the ampliﬁer shall be greater than 30 volts
per microsecond in stereo mode.
The ampliﬁer shall temporarily go into a stand-by mode if its power transformer
becomes excessively hot and shall automatically resume normal operation once it
has cooled to a safe operating temperature.
Front-panel controls shall include an enable on/off switch and a detented input level
control for each channel.
Rear-mounted controls shall include a ground lift switch to isolate the signal ground
from the chassis ground, a switch which selects between stereo, bridged-mono
and parallel-mono modes of operation and a reset switch for each channel's circuit
Internal controls shall include an input sensitivity switch to select between 0.775 V,
1.4 V or a ﬁxed voltage gain of 26 dB for full rated output.
A Crown P.I.P.-compatible expansion connector shall be provided behind an access
panel in the rear to accept auxiliary input modules. It shall be fully compatible with
the Crown IQ System.
Front panel indicators shall include an amber power enable indicator, an amber
protection system indicator for each channel which shall normally be illuminated
to conﬁrm the availability of reserve thermodynamic energy and which shall dim
in proportion to limiting when the power demands of the output stages have been
M A C R O T E C H
Architectural & Engineering Speciﬁcations
exceeded, and a green dual-function signal presence/input-output comparator indica-
tor for each channel which shall normally ﬂash at moderate intensity to show the
presence of an audio signal and shall ﬂash brightly if distortion of any kind equals or
The power ampliﬁer shall meet or exceed the following performance criteria. Input
sensitivity for rated output: 26 dB voltage gain (unbalanced). Rated FTC output in
stereo mode with less than 0.1% THD: 885 watts per channel (20 Hz to 20 kHz) into
8 ohms. Hum and noise: at least 105 dB (A weighted) below full rated output power.
Phase response: 10 degrees from 10 Hz to 20 kHz at 1 watt. Frequency response:
20 Hz to 20 kHz, 0.1 dB at 1 watt into 8 ohms per channel in stereo mode. Damping
factor: greater than 1000 from 10 to 400 Hz into 8 ohms. Intermodulation distortion
(SMPTE): less than 0.05% from 368 milliwatts to rated power into 8 ohms in stereo
mode. Harmonic distortion at rated power into 8 ohms per channel (stereo mode):
less than 0.05% from 20 Hz to 1 kHz and increasing linearly to less than 0.1% at 20
The ampliﬁer shall be safe when driving any kind of load—even highly reactive ones.
The power requirements shall be 120 VAC at 60 Hz. At idle, the ampliﬁer shall draw
90 watts or less.
The ampliﬁer chassis shall be constructed of steel with a durable black ﬁnish and
shall be designed for ﬂow-through fan-assisted ventilation from the front panel to the
side panels. The ampliﬁer shall have an aluminum front panel with Lexan overlay and
air ﬁlter media.
The dimensions of the ampliﬁer shall allow for 19 inch (48.3 cm) EIA standard (RS-
310-B) rack mounting. The ampliﬁer shall be 3.5 inches (8.9 cm) tall, 16 inches (40.6
cm) deep behind the rack-mounting surface, and 2.5 inches (6.4 cm) in front of the
The ampliﬁer shall weigh 55 pounds, 1.5 ounces (25.0 kg) and shall have a center of
gravity approximately 6 inches (15.2 cm) behind the front panel.
The ampliﬁer shall be designated the Crown Macro-Tech 3600VZ.
S E R I E S
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
Speciﬁcations subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown and Crown Audio are registered trademarks of Crown
International, Inc. Printed in U.S.A.
© 2005 Crown Audio