PoE Series Audio Amplifiers Operations Manual Rev E
Page 5
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Table of Contents
5.
Welcome
Congratulations on the purchase of your new Stewart Audio PoE Series audio amplifier. These amplifiers have
been designed and built to provide you with years of high-quality audio performance and trouble-free operation.
If after reading this operation manual you have questions concerning amplifier installation and operation, please
contact your Authorized Stewart Audio dealer, or you may contact us directly.
5.1.
Features
All Stewart Audio PoE amplifiers offer Dante™ low-latency audio transport over category cable. They
also comply with the AES67 standard. The AV8-2-LZ-D and CVA16-1-CV-LZ-D amplifiers are PoE+-
powered in accordance with the 802-3at standard. Both the DC power (30W port power) and the audio
data are delivered over a single category 5e/6 cable. The AV20-2-LZ-D and the CVA40-1-CV-D amplifiers
are PoE++ powered in accordance with the 802-3bt standard. They require a 60W PoE port to achieve
rated output power. The only other required connections to these amplifiers are to the loudspeakers.
The AV8-2-LZ-D and AV20-2-LZ-D are a low impedance amplifier delivering a maximum of 16W
RMS
/
40W
RMS
total from the two channels (typically 8W
RMS
/ 20W
RMS
per channel) across the 20-20kHz
frequency spectrum into 4Ω or 8Ω loudspeakers. The CVA16-CV-D and CVA40-1-CV-D are single-channel
amplifiers delivering up to 16W
RMS
/ 40W
RMS
of audio power into high impedance speakers, over the
100Hz to 20kHz frequency spectrum.
5.2.
Unpacking and visual inspection
Every Stewart Audio product is carefully tested and inspected before leaving the factory and should
arrive in perfect condition. If any damage is discovered, please notify the shipping carrier immediately.
Save the packing materials for the carrier’s inspection and for any future shipping.
5.3.
Installation and setup
5.3.1.
Cooling and ventilation
Due to the high efficiency of these PoE amplifiers, the heat generated is minimal, allowing for
installation in virtually space. They are convection cooled with on fans. These amplifiers are plenum
rated and have been tested to the requirements of UL Standard 2043.
5.3.2.
Power source
The AV8-2-LZ-D and the CVA16-1-CV-D amplifiers are powered by an 802.3at compliant PoE+ switch or
mid-span injector (30W port power). The AV20-2-LZ-D and the CVA40-1-CV-D amplifiers are powered by
an 802.3bt compliant PoE++ switch or mid-span injector (60W port power). The Powered Device IC (PD)
internal to the amplifier negotiates power requirements with the Power Sending Equipment (PSE) in the
switch or mid-span injector. These amplifiers can be powered by switches or mid-span injectors that do
not use a PSE IC for negotiation and monitoring (so called
passive
PoE injectors and switches), however,
Stewart Audio recommends applying power to the injector
after
the category cable is connected, and
removing power to the injector
before
unplugging the category cable.
In accordance with the 802.3 standard, these amplifiers will operate when connected to a lower-rated
switch or mid-span injector (for example, an 802.3af PSE with a 15.4W port power). However, the
power available at the Ethernet port will be lower. If the input level; to the amplifier is not reduced,
excessive power draw may force the PSE to remove DC power from the post and renegotiate the
powered connection.
