0. Calibrating Revel Rhythm 2 & Performa 3 Subwoofers
Using Revel’s Low Frequency Optimizer (LFO) Software

1. Rhythm2 Redefines the Category
18” Driver with Advanced Motor using Neodymium Magnet
2000 Watt RMS Amplifier
4000 Watt Peak
Low Frequency Optimizer (LFO) Provides Tools for Optimum EQ

2. B112 and B110 Subs 12” or 10” Woofer 1000 Watt RMS AMP
Same Connectivity as Rhythm2
SAME LFO as Rhythm2
EQ and Delay controls for blending into room and main speakers

4. Four Methods of Implementing Sub
Setting the Stage
Four Methods of Implementing Sub
Connect, set level and play
Calibrate Sub Only – Multi channel
Calibrate Sub and Measure Mains – Multi-channel or Two channel
Calibrate Sub, Calibrate Left and Right – for 2 channel systems
Note – all methods are manual calibrations

5. Tools you need PC or Mac iOS Device Optional (recommended)
With USB Port
Wireless Network
Download Revel LFO from Revel Website
iOS Device
iPad or iPhone
iOS 6 or later – may use internal mic
Older units must use external Microphone
Download AudioTools, Andrew Smith from App Store
(Studio Six Digital)
Optional (recommended)

6. Revel LFO Software on www.revelspeakers.com
LFO Programming Software includes..
Low Frequency Optimizer Software
Manual
Target Curve
Test Noise

7. Three Steps Calibration Overview
Set AV Processor Configuration and Set Levels
Take Measurements with Audio Tools via IOS Device
Use LFO software on laptop to Set EQ, Delay and level controls
Step 3
Step 2

8. Connect up to four subwoofers
Out to #2
From Processor
Out to 3
Out to #4 Or
From Processor

9. Configure HT Surround Processor
Configure Speaker Settings - Set Levels
Set Distance (delay) to all speakers
Use 80 Hz crossover
Set Mains to 75dB
Set sub or subs to 80dB
Use C Weighting , Slow Response

10. Take Measurement using Audio Tools
Play Downloaded Test Pink Noise
With Xover of processor engaged and only subs active
Begin Measurement
Pause every 15 secs and measure 5 locations
Stop, Name, Store then Export measurement
We recommend outboard Test Mics

11. Connect to sub #1 - Open Systems Tab
Open LFO
Connect to sub #1 - Open Systems Tab
Set Crossover to Flat
Set Delay Units

12. Set Subwoofer Delay in Subwoofer Tab
Set Delay by Measurement to listening position in Inches

13. Connect LFO Software to Amplifier (Sub)
Press to Connect to Subwoofer

14. Import Target Curve

15. Import Target Curve
File – Import Curve, Browse to Default LFO Target Curve

16. Import Target Curve

17. Import Measurement from IOS Device

18. Measurement Imported

19. Adjust Subwoofer Response Curve to overlay Target
Lower measured response here

20. Adjust Plot control to better view peaks and dips
Set Here

21. Use Parametric EQ Filters – 1 Filter
First Filter Used

22. Two Filters

23. 8 Filters Later
Measured Response now follows Target Curve

24. SAVE to Amplifier

25. Filters Downloaded
Represents Filters used on EQ Measured Response Curve
8 Parametric filters adjusted

26. When you are almost done
Check Levels
Listen
Save Files to disc
Congratulations you have completed!!

27. Review Overall Process Set Up AVR Level Measure LF Room Response
Using Spatial Averaging
Import Measurements to LFO
Determine Corrective EQ
Check Polarity
Recheck SPL Levels
Listen!!