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EAW Smaart 6 Operation Manual Applications
89
Stabilizing a System with EQ
Feedback is most commonly solved using EQ to remove or attenuate offending peaks.
Carefully run the system into feedback, identify problem frequencies, and set up filters
(i.e., EQ stages) to reduce gain at those frequencies. We strongly recommend using
parametric equalizers.
1. Connect the system as shown in Figure 4-10. This allows using the EQ without
switching the input signals to the computer.
2. Click the Spectrum button to set a two-pane display with Spectrograph on top
and RTA on the bottom.
3. Set the Spectrum’s Avg to 8 or less, click the Start button, and excite the sound
system at a low level with pink noise.
4. Slowly and carefully bring up the gain of an open microphone until the peaks
grow on the RTA display. At this point, the system starts sounding hollow as
the pink noise tries to excite feedback at a number of frequencies at once.
5. Slowly and carefully, bring up the gain of the mic’s input channel until the system
just starts to feed back. Watch for a vertical streak forming in the Spectrograph
display, corresponding to a higher-than-average peak in the RTA display.
6. Click the Stop button to freeze the analyzer, then reduce the sound system gain
to a level at which there is no feedback. Click the Capture tab on the RTA
display bar and store the trace.
7. Click on the spike in the RTA display and note its frequency in the cursor
readout above the plot area.
8. Click the Frequency Response button to display the equalizer response. The
goal is to set an attenuation (cut) filter centered on the feedback frequency to
dampen the resonances causing feedback.
9. Set a narrow bandwidth with 6-10 dB of cut with the center frequency of the
filter on the feedback frequency noted earlier.
10. Increase the filter’s bandwidth to about 1/3-octave, and reduce the cut to 3 dB.
Using wide, shallow filters minimizes phase distortions and allows the feed-
back frequency to drift as acoustics and other circumstances change during
the performance.
11. To determine the effectiveness of the filter, click the RTA display tab, bring
the system gain up with the same microphone open until it feeds back again,
and check the feedback frequency. If it is the same or very close, increase the
cut in the filter just set. If feedback occurs at a new frequency, apply another
filter using the same technique.
This procedure is simple, systematic, and much more accurate than playing it by ear.
Identifying each problem frequency precisely makes it easier to adjust the filters later
if necessary.
- USER GUIDE 1
- Table of Contents 3
- List of Figures 7
- Chapter 1: Getting Started 9
- 1.1.2 Measurement Microphone 11
- 1.1.3 Microphone Preamplifier 11
- 1.2.1 First Time Installation 12
- 1.3 Smaart 6 Signal I/O 14
- 1.4.1 The Menu Bar 17
- 1.4.2 The Plot Area 17
- 1.4.3 Cursor Readout 17
- 1.4.4 Start/Stop Buttons 17
- 1.4.6 Display Controls 18
- 1.4.8 Signal Generator 19
- 1.4.9 Internal Delay Control 20
- 1.5 How to use this Manual 21
- 2.1 Concepts 23
- 2.1.2 Fast Fourier Transform 24
- 2.1.3 Averaging 25
- 2.1.4 Sampling Rate 25
- 2.1.5 Frequency Resolution 26
- 2.1.6 Pink and White Noise 27
- 2.1.7 Data Window Functions 28
- 2.1.8 Impulse Response 29
- 2.1.9 The Transfer Function 29
- 2.1.10 Coherence 30
- 2.1.11 Signal Alignment 30
- 2.2 Glossary of Terms 31
- 2.3 Selected Bibliography 34
- 3.1 Spectrum Measurements 38
- 3.1.2 Spectrograph 40
- 3.2.3 The Magnitude Display 45
- 3.2.4 The Phase Display 46
- 3.2.5 Time Windowing 46
- 3.2.6 Averaging and Smoothing 47
- 3.2.8 Magnitude Thresholding 51
- 3.3.3 Automatic Delay Locator 55
- 3.4 SPL Measurements 56
- 3.4.2 Calibrating to SPL 57
- Figure 3-14 Legend dialog 61
- 3.6 Internal Delay 63
- 3.7 Internal Signal Generator 63
- 3.8 Weighting Curves 65
- 3.9 External Device Control 66
- 3.10 The Locked Cursor 68
- 3.11 Smaart 6 Screen Capture 69
- Chapter 4: Applications 71
- Measurement Signal 75
- Reference Signal 75
- Computer 75
- Line Out 75
- Equalizer 75
- 4.3 Measuring a Loudspeaker 77
- 4.3.1 Adjust Signal Levels 78
- Step 1: Evaluation Listening 85
- Step 4: Compare Positions 86
- Step 6: Critical listening 86
- Step 7: Stability Testing 87
- Chapter 5: Smaart 6 Commands 91
- 5.3 Options Menu 93
- 5.3.2 Frequency Response 95
- 5.3.3 IR Analysis 97
- 5.3.4 Audio I/O 98
- 5.3.5 Delay 99
- 5.3.6 Zoom 101
- 5.3.7 Instantaneous 101
- 5.4 Help Menu 102
- 5.5 Keyboard Shortcuts 103
- External Device Control 104
- Options Menu Shortcuts 104
- Chapter 6: Troubleshooting 105
- 6.3 Sound Hardware Problems 107
- 6.4 Performance Issues 108
- 6.5 Font and Display Problems 108
- EAW Smaart 6 Operation Manual 111
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