Troubleshooting, CX6, CX6T, CX12 and CX12T

CX6, CX6T, CX12 and CX12T

When the amplifier is first turned on, the red “PROTECT” LED on each channel will light for about two or three seconds, during which the output relays will stay open to mute the speakers. After the turn-on muting interval, the “PROTECT” LEDs turn off, the green “POWER” LEDs light, and the output relays close to enable the speaker outputs. Even during the muting interval, the yellow “SIGNAL” and red “CLIP” LEDs operate normally if there is a signal present. If the “CLIP” LED is on while the amplifier is muted, cut the gain back immediately to avoid a full-power blast of sound when the output relays close. If a channel stays muted with “PROTECT” lit, or if its “SIGNAL” or “CLIP” indicators light up when the gain is turned all the way down, it may be defective; see the troubleshooting segment for more information.

The “SIGNAL” LED indicates signal levels that are -30 dB (referenced to full rated output power) or higher.

Whe the amplifier is shut off, the amplifier should mute both channels virtually instantaneously, with the “PROTECT” indicators lit until the power supplies are discharged.

TROUBLESHOOTING

Problem: Channel will not come out of muting

•If reducing the gain control to × attenuation does not release muting, the channel is defective or overheated (see “Overheating,” below).

•If reducing the gain releases the muting, raise the gain back up slowly while you watch the “SIGNAL” and “CLIP” indicators; the problem may be an abnormal signal (with excessive ultrasonic energy, for example) that could otherwise damage your speakers.

PROBLEM: No sound (CX6/CX12)

•Is the channel muted? (If the “PROTECT” indicator is lit, the channel is muted; see below.)

•Is the “SIGNAL” LED lit or flashing? (If so, the speaker is open or blown, there is an open circuit in the speaker wiring, or there is an open circuit in the internal output wiring of the amplifier.)

•If the “SIGNAL” indicator is dark, there is probably not enough signal, or even none at all. Try turning up the rear panel attenuators or boosting the signal level at the input.

•If the “SIGNAL” indicator shows little or no activity but the “CLIP” LED is lit or flashing, there is probably a short circuit in the speaker wiring, especially if the “PROTECT” indicator starts flashing. It is also possible, but less likely, that the channel’s output relay is defective and will not open, thereby short- circuiting the channel output and producing the same symptoms.

PROBLEM: Channel goes into muting, with “PROTECT” LED on (CX6/CX12)

•If the fan is running full speed, the channel probably suffers from severe overheating. Unless there is a blockage in the flow of cooling air, the channel should return to normal within a minute or so (see “Overheating,” below).

CX Series specifications

QSC Audio, a recognized leader in professional audio solutions, presents the CX Series of amplifiers, a fusion of power, efficiency, and cutting-edge technology designed to meet the demands of various sound reinforcement applications. Known for their reliability and outstanding performance, the CX Series amplifiers are perfect for installations in venues, theaters, and houses of worship, delivering high-quality audio reproduction regardless of the setting.

At the core of the CX Series is its robust Class D amplification. This technology not only ensures excellent audio fidelity but also enhances energy efficiency, resulting in lower operational costs and cooler running temperatures. The amplifiers utilize a linear power supply, which contributes to exceptional audio quality by providing stable and clean power to the components. With varying power ratings, including options ranging from 200 to 1200 watts per channel, the CX Series caters to different venue sizes and specific audio requirements.

The CX Series is engineered with a range of features that enhance usability and performance. Integrated DSP (Digital Signal Processing) allows users to access advanced sound processing algorithms, enabling fine-tuning of audio settings for optimal performance. The amplifiers include comprehensive protection circuitry to safeguard the equipment from thermal overload, short circuits, and signal clipping, ensuring longevity and reliability in demanding environments.

Connectivity is also a significant aspect of the CX Series. The amplifiers are equipped with a variety of input and output options, including XLR, 1/4" TRS, and barrier strip connectors, facilitating seamless integration with a wide range of audio sources and speakers. Moreover, the user-friendly interface includes LCD displays for easy monitoring, making setup and adjustments straightforward for audio engineers and technicians.

Another defining feature of the CX Series is its lightweight design. This portability makes installation and transport easy without compromising on performance. Additionally, QSC’s commitment to sustainability is evident in the design, as the amplifiers are constructed with environmentally friendly materials and have a reduced carbon footprint, aligning with modern practices in eco-conscious audio engineering.

In summary, the QSC Audio CX Series amplifiers blend professionalism with versatility, delivering exceptional performance that satisfies both audio quality and operational reliability. Their innovative technologies and thoughtful design make them a powerful ally for professionals in any sound reinforcement scenario.