FLX-E Operations Manual Rev F
Page 11
Table of Contents
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input signal level, as well as after the DSP to change the local output
levels. Note that the FLX-E is a DCE device, that is, the transmit pin
from the RS-232 controller should connect to the transmit pin of the
FLX-E, and similarly for the receive connection.
All RS-232 levels (both pre-mix and output) are reset to 0 dB
attenuation and unmuted on all channels when the “reset” button is
selected in any of the output DSP blocks. See Appendix B for
command structure and programming information.
6.1.4
IP Control
FLX-E Series amplifiers can also be controlled via a TCP/IP connection through the control port of the RJ-45
jack. This jack also serves as the Dante port for Dante-enabled models. Note that these two ports may be
on the same network or on different networks/subnets. The RS-232 commands as well as a few others are
available over the control port. See Appendix C for command structure and programming information.
6.1.5
Speaker Connections
6.1.5.1
Low Impedance Models (-LZ suffix)
Stewart Audio recommends using high-quality, heavy-gauge speaker wire and connectors to send the
output signal of your amplifier to the speakers. Use the table in
as a guideline when selecting
your wire gauge.
Speaker leads connect by means of removable terminal block connectors supplied with the unit. Strip
speaker leads 1/4” and insert into connector observing proper polarity. With a small, flat-blade screwdriver,
tighten the screw until the leads are held securely in place. Inspect for possible shorts or broken wires.
6.1.5.2
Constant Voltage (High Impedance) Models(-CV suffix)
Constant voltage amplifiers are designed to facilitate paralleling a number of high impedance speakers on a
single output (channel). Ideally the output signal level is set to deliver nominally 70.7V
RMS
(100V
RMS
in
Europe) at the output terminals. Each speaker transformer is then appropriately tapped to deliver the
required volume level for that speaker. Make certain that the total tapped power from all speakers
connected to an output channel does not exceed the rated power of that channel. A good rule of thumb is
to load the channel no more than 75-80% of rated power.
Care should be used when working around the speaker terminals. Though not officially recognized as a
shock hazard in the UL 60065 Safety Requirements, touching these terminals can be quite unpleasant and
should be avoided.
Because the current flow in constant voltage systems and speakers is much lower than in 4/8Ω systems,
higher gauge (thinner diameter) wire can be used. Please refer to the table in
to choose the
appropriate wire gauge for your installation.
Speaker leads connect by means of removable terminal block connectors supplied with the unit. Strip
speaker leads 1/4” and insert into connector observing proper polarity. The output voltage is selected by
positioning the removable terminal blocks between the desired system voltage (70V or 100V pin) and the
