QSC Audio HPR122i, HPR152i, HPR153i, HPR151i, HPR181i specs

SIGNAL Indicator LED

The green SIGNAL indicator alerts the user to the presence of an input signal to the HPR loudspeaker.

Normal Indication

The green SIGNAL indicator illuminates when the input signal exceeds -25 dB.

If No Indication

Check Gain settings and increase gain if necessary. Check input connections and audio source for signal. If the red LIMIT LED illuminates, refer to the LIMIT indicator section, below.

Abnormal Indication

If the green SIGNAL LED illuminates with no signal input, there may be system oscil- lations or some other malfunction. Disconnect the input or fully reduce the gain. If the green SIGNAL LED remains on, the amp may need servicing.

LIMIT Indicator LED

The red LIMIT indicator alerts the user to several conditions within the HPR loud- speaker:

Continuous Bright Red Light

•Indicates protective mute mode.

•The speaker normally passes through muting for several seconds after applying power, after which the light should go out, and sound should be heard.

•If the speaker enters Mute during operation, it has either overheated or developed a fault.

•Overheating should correct itself within 1-2 minutes, after which sound should resume. See below for a full explanation of thermal protection.

•Short periods of muting indicate a component fault. In this case AC power should be removed and the speaker serviced.

Momentary Bright Red Flashes

•During operation, bright flashing indicates clipping (overdrive distortion). This is nor- mally due to excessive volume and may be accompanied by audible distortion.

•If the loudspeaker mutes repeatedly during output peaks, there may be a component fault; AC power should be removed and the loudspeaker serviced.

Continuous Half-bright Light

•Indicates that the internal limiter is reducing gain, due to prolonged clipping and/or excessive temperature.

•After several seconds of severe clipping, the limiter will reduce power to protect the speaker and improve the sound. This results in a steady, half-bright red indication. Any further clipping will still result in bright flashes on top of the steady half-bright indication. When the program level is reduced, the limiter will clear after several sec- onds, and the red indicator will go out.

•If the power module overheats, the first response is to trigger limiting, to reduce vol- ume and limit further temperature rise. This results in a steady half-bright illumina- tion that does not clear even after reducing program level. It may take several minutes for temperature to drop and clear the limiter. During this time, the exposed heat sink will feel uncomfortably hot to the touch. If overheating continues, the amplifier will ultimately mute, resulting in a full-bright red indication. When muting clears, the amplifier will resume operation, with thermal limiting still active until it further cools off.

•Overheating is usually caused by excessive ambient temperature, since the internal temperature rise of the power module is relatively low. Protect the speaker from excessive temperatures, such as being placed over a heater vent, or allowing direct sunlight to impinge upon the heat sink surface.

LED indicators.

HPR122i, HPR152i, HPR153i, HPR151i, HPR181i specifications

QSC Audio is renowned for delivering high-quality audio solutions, and their HPR series is a testament to this commitment. The HPR122i, HPR152i, HPR153i, HPR151i, and HPR181i are standout models in the lineup, catering to a variety of sound reinforcement needs.

Starting with the HPR122i, this model is a 12-inch two-way loudspeaker designed for portable applications. It features a built-in 1000-watt Class D power amplifier, delivering exceptional clarity and high output. The rugged birch plywood enclosure enhances durability, while the advanced waveguide technology ensures a wide dispersion pattern, making it ideal for both live sound and permanent installations.

Moving up, the HPR152i showcases a larger 15-inch woofer, perfect for larger venues where deep bass and punchy sound are required. It retains the same robust build quality and integrated amplification as its smaller counterpart, ensuring reliability during extended use. The HPR152i’s contoured design allows for versatile positioning, whether it's on stands or as a floor monitor.

The HPR153i takes it a step further, offering a three-way design for even greater fidelity. With a dedicated 15-inch woofer, a 6.5-inch midrange, and a 1-inch compression driver, the HPR153i delivers a rich and detailed sound across all frequencies. This model is especially favored in settings where clarity and precision are paramount, such as concert halls and theatres.

Not to be overlooked, the HPR151i is a powerful subwoofer that complements the full-range speakers in the HPR series. Its 15-inch driver, paired with a 1000-watt Class D amplifier, delivers deep, impactful bass, enhancing the overall sonic experience. The HPR151i is ideal for situations requiring enhanced low-frequency response, making it a great match for DJs and live performers.

Finally, the HPR181i subwoofer elevates the low-end even further with its 18-inch woofer. This model is designed for serious bass enthusiasts, providing thunderous lows that can fill large spaces. Its robust design and advanced thermal management allow for extended use without overheating.

All models in the HPR series incorporate QSC’s Digital Signal Processing (DSP) technology, ensuring optimal sound performance and system protection. With their rugged construction, advanced features, and powerful sound, the QSC HPR series stands out as a top choice for audio professionals seeking reliability and exceptional performance in live sound applications. Whether for music, speech, or multimedia, the HPR series effectively meets the demands of diverse sound environments.