User manual QSC AUDIO HPR181W

[. . . ] 1675 MacArthur Blvd. , Costa Mesa, CA, 92626 USA Main Number (714) 754-6175 or toll free (USA only) (800) 854-4079 Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834 HPR Series Powered Loudspeaker Products User Manual HPR153F HPR152F HPR151W HPR181W 15-inch three-way 15-inch two-way 15-inch subwoofer 18-inch subwoofer *TD-000212-01* TD-000212-01 rev. D Important Safety Precautions & Explanation of Symbols Install in accordance with QSC Audio Product's instructions and under the supervision of a licensed Professional Engineer. WARNING! CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous" voltage within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in this manual. 1- Read these instructions. 5- WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. [. . . ] There are 21 detents for repeatable adjustments. Turn the gain control adjustment range clockwise to increase gain and counter clockwise to decrease gain. Initially, set all gain controls to 0dB. When used as a system, the subwoofers and full-range models are designed to provide the correct frequency (tonal) balance when both the subwoofers and the full-range loudspeakers are set to approximately 0dB. Final system adjustments should be made within the range of adjustment marked "NORMAL". The range below -4 dB should not be used for normal program levels, as the input headroom could be exceeded, but can be used for testing at reduced levels. If the input signal is extraordinarily strong, it may be required to adjust the gain control in the range below -4dB. A better solution might be to reduce the input signal strength to the powered loudspeaker(s). The range above +4dB should not be used for normal program levels, as the loudspeaker may be more easily driven into clipping (distortion due to overdriving the amplifier). If the input signal is extremely weak, it may be required to adjust the gain control(s) into the range above +4dB. A better solution would be to increase the input signal strength to the powered loudspeaker system. At the -20dB setting, the signal is not completely cut off. To fully cut off the signal, fully reduce the input signal to the powered loudspeaker(s). Subwoofer Gain Notes Scenario: One input signal only to the subwoofer, one full-range loudspeaker for each subwooferThe HPR loudspeakers are designed to be used as a system, typically using one subwoofer for each full-range loudspeaker. If the subwoofer and the full-range loudspeaker have their Gain controls set to 0dB, 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 subwooferWhen two inputs (L+R) are applied to the subwoofer, an additional gain of 6dB is automatically applied to the subwoofer. The additional gain is added to the subwoofer to keep the tonal balance correct for use with two fullrange loudspeakers. 8 100 Hertz Low-Cut Filter Switch (HPR152F and HPR153F) Below the LED indicators is a small recessed slide-switch that enables or disables a 100 Hertz low-cut filter. 100 Hertz low-cut filter switch off and on positions Filter OFF (Full Range) Turn the filter OFF when using without subwoofers or dedicated 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 less distortion at low frequencies and provides improved clarity in the low-mid frequencies. Front LED Switch The Front LED Switch, located on the rear panel, is used to enable or disable the LED located on the front of the enclosure near the bottom of the grill. Slide the switch to the ON position to enable the front LED and slide it to the OFF position to disable the front LED. Most applications merit the use of the Front LED so power status can be visually confirmed, easily and quickly. For applications where the LED may distract audience members, it is easily disabled by sliding the FRONT LED switch to the OFF position. Front LED switch off and on positions Phase Switch (HPR151W and HPR181W) When all loudspeakers in system are properly phased, a positive polarity drive signal results in a forward excursion of all loudspeaker cones. This, in turn, sets up a positive reinforcement of the sound wavefront (each loudspeaker reinforces the actions of the other loudspeakers). This effect is most pronounced at low (bass) frequencies. [. . . ] 2- Directivity Index (DI): Difference between on-axis SPL and average SPL (considering all axes) for the specified coverage range. DI= 10 log Q 3- Directivity Factor (Q): Directivity index expressed as a power ratio Q=10 exp DI/10 4- Amplifier Power: The maximum sustained power at less than 1% clipping, averaged over the intended frequency range, 5- Input Sensitivity: The sine-wave input voltage required to reach amplifier clipping, measured within the frequency range used to determine Maximum Peak SPL, with the gain on "normal" and no gain reduction due to limiting. 6- Input Headroom/Clipping: Maximum input voltage. 7- Input Connector/Impedance: RF shunt capacitance should not reduce impedance by more than 30% at 20k Hz. 17 Specifications, Subwoofer Models HPR151W Frequency Response, ±6dB Frequency Range, -10dB limit Maximum Peak SPL Nominal coverage, H x V Directivity Index Directivity Factor Transducer Description 47-110 Hz 43-140 Hz 133dB Not applicable (N/A) 0 1 15" (381mm) transducer with 3" (76mm) voice coil HPR181W 42-110 Hz 39-140 Hz 134dB Not applicable (N/A) 0 1 18" (457mm) transducer with 4" (102mm) voice coil Amp Power Input Sensitivity Input Headroom/Clipping Input Connectors/Impedance Output Connectors Controls, Indicators, and Adjustments Protection, Agency certs. 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