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EAW Smaart 6 Operation Manual Applications
88
Stabilizing a Sound System
Stabilizing an unstable system means giving it more GBF, primarily by reducing the
gain at the feedback frequencies. Although not a panacea or a substitute for good system
design, EQ is one of the most powerful tools to stabilize a sound system.
Smaart 6 can help identify feedback frequencies and apply precise EQ. But before you
start turning knobs, remember that EQ affects the overall frequency response of the
system. Other strategies might be equally or more effective and afford greater freedom
to make the system sound better.
Mechanical and Acoustical Solutions
The mic’s relative position to speakers and/or monitors can drastically affect the feedback
characteristics (frequency and amplitude). Reducing the gain at a problem frequency
can sometimes be as simple as using a different microphone or re-positioning a mic (a
strategy best employed with stationary mics).
Moving or redirecting speakers is also possible. Speakers placed close to (or behind)
microphones often cause feedback. In such cases it may be possible to add sound absorb-
ing material or a baffle to reduce the speaker’s field at the mic position or simply reduce
the speaker’s operating level. These solutions are obviously most attractive when they
can be applied without compromising the system’s design goals.
Educational Solutions
A stable system may become unstable when a certain number of microphones are open at
once. The best solution may be to train the operator to mute microphones when not in use.
Educating the performers in microphone technique can also be beneficial. Grabbing a
cardioid microphone, as many singers do, can increase its gain at certain frequencies
because the hand closes off the rear ports to the microphone element. Many performers
also point the mic at the monitor as they dance and move around the stage. Leaning too
close to a microphone can reflect energy at problem frequencies back into the microphone,
possibly causing feedback.
Electronic Solutions
Some reverberation devices and specific effect patches can destabilize an otherwise
stable system. If this occurs, experiment with other settings and/or reduce the overall
reverb level.
With a simple system, polarity or phase changes could solve a feedback problem im-
mediately. When the polarity is inverted, instead of positive feedback (negative impact
on sound) we should obtain negative feedback (possibly beneficial). However, in large,
complex systems with multiple return paths many wavelengths long, phase or polarity
changes is likely to merely shift the feedback frequency without increasing stability.
- 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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