Related Manuals for SABINE POSITIVE FEEDBACK
Summary of Contents for SABINE POSITIVE FEEDBACK
- Page 1 Version 3 Positive Feedback ™ The Advantages of FBX Feedback Exterminators ® INSIDE: Story of Feedback Equalization The FBX Solution Glossary of Tech Terms ®...
- Page 2 The Story of Feedback By Doran Oster, President ly the room itself, has its own set of resonant frequencies. What is acoustic feedback? Ever since Lee DeForest Each component adds togeth- invented the first vacuum tube, er to produce the total sys- Feedback is the loud ringing engineers have walked the tem’s resonant frequencies.
- Page 3 E Q UA LI Z AT I O N directly off a wall back into mic, the sound quickly loses It may seem paradoxical to energy, dropping to one quar- the mic. You can estimate the add filters to a sound system in ter the energy every time the speaker’s dispersion pattern order to increase the gain.
- Page 4 Adaptive Parametric: Fig. 2: Graphic EQ The FBX Solution Typical Graphic EQ: The Sabine FBX Feedback Exterminator ® is -10 dB cut at 500, 630, 1K, 1.25K, 1.6K & 2K Hz the next step in the evolution of feedback control. The FBX is essentially a self-tuning parametric EQ.
- Page 5 THE FBX SOLUTION to 9 dB increase in gain com- ent locations. Each position on ference comes after the filter is pared with using the EQ alone. the stage has its own unique placed. Fixed filters remain on set of resonant frequencies, so the initially detected feedback 5.
- Page 6 Another feature of ClipGuard is TURBO mode that cuts the time of the pre- program setup to just a few seconds. ClipGuard is currently a standard feature in Sabine’s FBX-1020P & 2020P Feedback Exterminators, POWER-Q ADF-4000, GRAPHI-Q, DQX-206 parametric EQ/delay...
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Page 7: Frequency Response Curves
TE C H T ER MS ally perceive the sound of air With this in mind, we realize equalizer with the 1,000 Hz molecules hitting their ear- that turning up the system gain slider pulled down 12 dB. The drums. On the other hand, by 3 dB increases the power frequency response curve people working near jet... - Page 8 TE C H TE R MS causes feedback, you will have Fig. 7: Typical Constant Q Filter to cut the gain of the feedback frequency at the EQ in order to add gain at the mixer. A more accurate concept could be called NET gain.
- Page 9 TE C H TE R MS...