Revel LFO - Manual (Page 13)

13 LFO Programming Software
User Guide
MEASURING YOUR SUBWOOFER(S)
1. Determine the various locations for the measurement microphone. You should optimize the measurements for your room's seating area by taking
measurements only within it. (A large seating area will require more measurements.)
NOTE: You can weight the results to favor the primary listening position (PLP) by measuring for a longer time in that location than at the other mic
positions.
2. Play the test noise through the subwoofer(s).
• If you have previously established your system's reference playback level using the processor's auto setup procedure or using an SPL meter, set the
system at the reference volume control setting.
• If your system's preamp/processor does not provide a method of establishing a reference playback level, you must use the AudioTools SPL Meter
function to establish the proper playback level for the test noise you are using to perform these measurements:
a) On the AudioTools main menu's left column, tap "SPL". In the right column, tap "SPL Meter (Analog Sound Level Meter)". The SPL Meter screen
will appear.
Ballistics Switch
Weighting Switch
Range Knob
Indicator Needle
b) Set the meter up as shown above: Range Knob = 80dB, Ballistics Switch = Slow, Weighting Switch = C Weighting.
c) Hold the iOS device in the PLP while the test noise is playing through the subwoofer(s). Adjust your audio system's main volume control so the
meter's indicator needle points to –5dB on the bottom scale and the dB indicator in the meter's lower right indicates 75.0dB, as shown in the
illustration above.
d) Once you have set the volume so the test noise plays at 75dB, we suggest that you write down the system's volume control setting for future
reference.
3. Place the microphone in the PLP, tap the AudioTools Start button and measure for at least 1 minute (the AudioTools counter will read 6:00 at the
1-minute point). Measure for a longer time to weight the results to favor the PLP.
IMPORTANT: Make sure the room remains free of all extraneous noises while you're performing the measurement. We recommend turning-off any
HVAC systems, and other sources of noise, such as bar refrigerators, etc. Doors should be opened or closed to match the normal conditions when using
the system.
4. Tap the AudioTools Pause button to pause the measurement.
5. Move the mic to the next measurement position, tap the Start button to resume measuring; measure for 1 minute, then tap the Pause button.
6. Repeat Steps 3 – 5 for each mic position.
NOTE: We recommend using at least fi ve repeatable measurement positions.