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. [. . . ] This prevents any undesired turn-off transients (thumps, bumps) in the connected devices. If using the subwoofer's 100 Hz LOW-CUT OUT connector to provide signal to the top-boxes (HPR152F and HPR153F), be sure the top-box's low-cut filters are OFF. Do not apply a second filter as the sonic performance of the system will be notably degraded. Gain Control The Gain control is located on the rear panel and is easily adjusted without tools. The Gain control is marked in Gain control recommended dB and is adjustable from -20dB to +10dB. Turn the gain control adjustment range clockwise to increase gain and counter clockwise to decrease gain. 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. 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). If a loudspeaker is not properly phased, its cone moves inward while the properly phased loudspeaker's cones move outward. The inward movement will effectively cancel the bass response of a similarly-sized driver in the system, resulting in a reduction in the bass content. [. . . ] Use only high-quality balanced cables for interconnecting the audio equipment. Ensure the top-boxes have their 100 Hz LOW-CUT FILTER switched on when connecting to the subwoofer's FULL RANGE LINE OUT as a signal source. Also, be sure to use either the Left or Right (marked L or R) on the subwoofers. If the subwoofer's input is connected to the Right (R) channel connector and the output to the top-boxes is connected to the Left (L) channel connector, no signal will reach the top-box (no sound from the top-box). [. . . ]