Section 3: Operation- LED Behavior & Bypass Switch Usage

LED BEHAVIOR- When the power is switched ON, all of the LED’s light briefly and then the PORT LED’s sequence through two patterns. The LED’s then resume normal operation. The LED functions are described below.

POWER LED- The power LED will illuminate whenever the power switch is in the POWER (ON) position.

DIAGNOSTIC LED- This indicator first illuminates during the power-on self test of the CM16a, then should turn off. It will also illuminate to indicate that the CM16a self-test has detected an unexpected event, such as a corrupted firmware update via TFTP or a memory boot failure. This would typically be accompanied by a “fault code” displayed by the PORT CONNECTED indicators (described below). If the DIAGNOSTIC LED remains illuminated, try resetting the CM16a by cycling power off and on once. Should the indication persist, contact Technical Services for guidance.

NETWORK STATUS LED’s- For diagnostic purposes, there are three network status LED’s on the front and rear panels of the CM16a. They are labeled RCV, XMT and LINK STATUS. Their locations are shown in the illustration at the start of the Introduction section. Their functions are described below.

RCV- This LED lights up any time the CM16a receives data over the network.

XMT- This LED lights up whenever the CM16a transmits data over the network.

LINK STATUS- When lit, this LED indicates that the CM16a is connected to an operating Ethernet network.

If not lit, there is most likely a cabling problem between the CM16a and the hub or possibly a fault in the hub.

PORT CONNECTED LED’s- These LED’s are labeled PORT A through PORT H on the front panel. The respective LED will illuminate when functional connection has been made between the CM16a and an amplifier. The amplifier’s power does not have to be ON in order for the LED to indicate successful connection. As mentioned above, these LED’s may also display specific “fault codes” if the CM16a detects an internal failure in one of its associated self-test/diagnostic parameters. The “fault code” will be in the form of a specific sequence of these LED’s being illuminated.

BYPASS SWITCH USE

There are two distinctly different BYPASS modes.

The first mode is the “Oops, I forgot the computer” or system troubleshooting type of BYPASS. If you are unable to communicate with the CM16a for any reason and you need to bypass the unit, it can be done with the push of a button instead of rewiring the system.

If the CM16a is powered-up and there is no host computer control (or the network is non-operational), the operational state (as saved in Preset #0, the start-up preset) could prevent the audio from being supplied to the amplifiers. We have addressed this potentially disastrous situation by providing a BYPASS (or “virtual-wire”) mode switch. The function of this switch is to put the CM16a into a known state of operation. This “BYPASS” state routes all audio through the CM16a in a “virtual wire” mode (1Vrms input sensitivity, PAGE input disabled, MUTE disabled, 0 dB level, normal polarity). This insures that audio can still be passed through the CM16a regardless of

network/computer issues. (continued on next page)

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QSC Audio CM16a manual Operation- LED Behavior & Bypass Switch Usage, There are two distinctly different Bypass modes
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CM16a specifications

The QSC Audio CM16a is a versatile and powerful amplifier designed to meet the demands of professional audio applications. Known for its reliability and performance, the CM16a is ideal for both live sound and installation scenarios, offering a perfect blend of advanced technology and user-friendly features.

One of the standout features of the CM16a is its Class D amplifier architecture. This technology ensures not only high efficiency but also a lightweight design, making it easier to transport and install in various settings. The amplifier delivers an impressive output power of 1600 watts at 4 ohms, providing ample headroom for demanding audio applications. The CM16a is capable of handling multiple speaker configurations, making it a flexible choice for various setups.

Another key characteristic of the QSC CM16a is its advanced thermal management system. This built-in feature ensures the amplifier operates within safe temperature limits, enhancing reliability and extending the lifespan of the unit. The CM16a also includes an intelligent protection circuit that safeguards the amplifier from overload and short circuits, allowing users to operate it confidently even during intense performances.

The CM16a comes equipped with multiple inputs and outputs, including XLR and TRS connectors, enabling seamless integration with a range of audio sources and systems. This versatility allows for easy connection to mixers, microphones, and instruments, making it suitable for diverse applications from concerts to corporate events.

In addition to its robust performance, the QSC CM16a features an intuitive front panel design with LED indicators for quick monitoring of system status and performance. Users can easily adjust levels and settings, ensuring optimal audio quality for any given situation.

The amplifier is also designed with efficiency in mind, incorporating Power Factor Correction (PFC) technology. This enhances power usage, reducing operational costs while minimizing environmental impact.

In conclusion, the QSC Audio CM16a stands out as a premier choice for audio professionals seeking a reliable, high-performance amplifier that can deliver exceptional sound quality. With its Class D technology, advanced protection features, versatile connectivity, and user-friendly design, the CM16a is a worthy investment for any audio application. Whether for live sound reinforcement or permanent installations, the CM16a promises to meet the needs of even the most demanding audio environments.
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