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JBL PRX One Manual

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e. “Custom” allows the user to set the lower settings manually.
f. “HPF on this Speaker” can be used to remove signal below a selected frequency to the built-in amp/
speaker and tweeter bar.
g. “LPF on Pass Thru Out”can be used to set the low pass lter on the Thru Out XLR output feed.
8. Time Align
a. Signal delays are used when multiple speakers are in use but speakers are at different distances from the
audience.
b. Examples:
i. A subwoofer in front of the stage, while this full-range speaker is on the stage. In this conguration,
the Pass Thru XLR to subwoofer will need to be slightly delayed to make up for its closer position to
the audience.
ii. The Array bar extender option is used to mount the speaker bar in a off-speaker location at a slightly
different distance to the audience. In this case, delay the device closest to the audience to align with
the device farthest from the audience.
iii. The Pass Thru XLR out is feeding an additional full-range speaker placed half-way back in the
audience to give additional listening distance. In this case, delay the back ll speaker in the audience
to compensate correct time alignment.
c. Time Alignment Basics:
i. To compensate for different distances’, determine the speaker farthest from the audience and
delay other speakers with the same signal to “time align” with the speaker farthest away from the
audience.
ii. Sound travels through air at average humidity and room temperature at about 1.1 feet per ms.
Measure the difference in distance of each speaker feeding the audience. Feed the speaker farthest
from the audience with no time alignment delay. Set delays for the other closer speakers based
on their distance ahead of the farthest back speaker. Measure the distance difference and enter
1 ms per 1.1 feet that each speaker is ahead of the farthest back speaker in your conguration.
Time alignment is not perfect as not all audience positions measure the same speaker distance
differences.
iii. “Delay Pass Thru Out” Using this delay will place speaker delay on the PASS THRU Output.
iv. “Delay This Speaker” Using this delay will place the delay on the INPUT of the mixer of the current
speaker.
v. “Delay Extended Tweeters ” Using this will delay the audio signal between the woofer and the array
bar.
… 26 …


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