GAIN Control

The GAIN control is marked in dB of attenuation. There are 21 detents for repeatable adjustments. Turn the GAIN con- trol clockwise to increase gain and counter clockwise to decrease gain.

The upper 14 steps are about 1 dB each and settings should normally be made within this range. When operat- ing with the GAIN set below -15 dB, it may be possible to exceed input headroom. If this is the case, reduce the input signal strength and increase the gain of the loudspeaker amplifier.

Subwoofer Gain Notes

Scenario: One input signal only to the subwoofer, one full-range loudspeaker for each subwoofer- The HPR loudspeakers are designed to be used as a system, typically using one subwoofer for each full-range loud- speaker. If the subwoofer and the full-range loudspeaker have their Gain controls set identically, the tonal balance will be correct (or very close to correct).

Scenario: Two input (L+R) signals to the subwoofer, and two full-range loudspeakers per subwoofer- When two inputs (L+R) are applied to the subwoofer, an additional gain of 6dB is automatically applied to the sub- woofer. The additional gain is added to the subwoofer to keep the tonal balance correct for use with two full-range loudspeakers.

100 Hertz Low-Cut Filter Switch: HPR122i, HPR152i, and HPR153i

Below the LED indicators is a small recessed slide-switch that enables or disables a 100 Hertz low-cut filter.

Filter OFF (Full Range)

Turn the filter OFF when using without subwoofers or dedi- cated low-frequency enclosures.

Filter ON (100 Hz Low-Cut)

Turn the filter ON when using with optional subwoofers or low-frequency systems. This results in proper subwoofer operation and allows the top box to provide improved clar- ity in the middle and high frequencies. HPR122i: If using as a floor monitor, turn the filter ON for improved vocal range clarity and to reduce low frequency build-up on stage.

Gain control.

HPR152i and HPR153i 100 Hertz low-cut filter switch.

HPR122i 100 Hertz low-cut filter switch.

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QSC Audio HPR122i, HPR152i, HPR153i, HPR151i, HPR181i user manual Gain Control, Subwoofer Gain Notes, Filter OFF Full Range
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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.
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