Why you must calibrate your Audio Monitor speakers and how to do it
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This document discusses how to properly calibrate monitorspeakers. It recommends aiming the speakers towards the listening position and setting an equal distance between the speakers and listener. The optimal speaker height is ear level. Room acoustics like early reflections and wall distance impact sound and should be addressed. Genelec products help correct issues from room interactions to achieve accurate sound reproduction.
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Why you must calibrate your Audio Monitor speakers and how to do it
- 1. Why you must calibrate your Monitorspeakers and how to do it
- 2. Finland: - North of Europe Arctic Circle - Population 5,4 Mil. - Iisalmi 400 km from Iisalmi the Arctic Circle Kuopio Kuopio Helsinki Helsinki
- 3. • Genelec has been manufacturing active loudspeakers in Finland for almost 35 years
- 4. Setting up the monitors
- 5. Standard stereo pair, a virtual sound image Virtual sound image (in this case stereo image) is formed between the loudspeakers. Precision of the sound image depends on 3 elements: 1. The quality of audio source 2. The quality of loudspeakers 3. The acoustics in the listening room
- 6. Preventing early reflections Early reflections can be attenuated by: • Removing or turning reflecting surfaces • Adding absorption or diffusion on the reflecting surfaces • Moving the speakers The hard surface can be turned so that reflection does not hit the listener
- 7. Loudspeaker layout and aiming – Aim the loudspeakers towards the listening position – Set equal distance from the loudspeakers to the listening position – Set correct angles • Left - Right distance is the same as the distance from listening position to the loudspeakers (60 degrees) Recommendation ITU-R BS.775-1
- 8. Loudspeaker height • Loudspeakers optimal height is at the listener’s ear height , typically around 1.2m • If unwanted floor reflections occur, try increasing the monitor height • If the speakers are set on a higher level, the tilt-down should be max 15 degrees - to avoid the displacement of sound image
- 9. Loudspeaker distance, choosing the right monitor
- 10. This information is available on web site www. genelec.com and in the Monitor Setup Guide handout
- 11. Loudspeaker in a room
- 12. Loudspeaker radiation pattern Enclosed driver Omnidirectional radiation Radiation to forward Forward beam width typically f < 200Hz direction only becomes narrow typically f > 300 Hz typically f > 10 kHz
- 13. Wall loading effect Wall loading increases output level at bass frequencies boomy sound can be corrected by equalization free half quarter 1/8 space space space space Flat +6dB +12dB +18dB No walls flat response One wall close to Two walls (corner) Three walls close to the loudspeaker close to the loudspeaker the loudspeaker
- 14. Compensation of the wall loading Bass Tilt -6dB
- 15. Recommended wall distance The minimum distance allows the bass reflex port to work properly The distance produces bass cancellation, causes loss of bass frequencies in the listening position
- 16. Back wall cancellation • Back wall cancellation will cause loss of bass in the listening position • Avoid placing the monitors between 1- 2.2 m from the wall due to back-wall cancellation! You can easily find the cancellation frequencies with the Genelec AcoustiTape. Ordercode MAI-0079. 16
- 17. Genelec Directivity Control Waveguide, DCW
- 18. Conventional ”square box” design On axis Gain A Gain, dB Conventional Loudspeaker 15 Horiz Gain Horizontal off axis 30 Horiz Gain 90 45 Horiz Gain 85 60 Horiz Gain 80 75 70 65 60 55 50 10 100 1,000 10,000 100,000
- 19. Genelec 8000 series On axis Gain A Gain, dB Genelec 8050A - Horizontal off axis 15 Horiz Gain 90 30 Horiz Gain 45 Horiz Gain 85 60 Horiz Gain 80 75 70 65 60 55 50 10 100 1,000 10,000 100,000
- 20. Genelec DSP products - solutions to a perfect sound
- 21. Genelec Loudspeaker Manager - automated calibration system • Even problematic rooms can become usable!!
- 22. Genelec DSP monitoring loudspeakers 8130A 8240A 8250A 8260A 1238CF coaxial three-way
- 23. Supporting DSP subwoofers SE7261A 7260A 7270A 7271A
Notas do Editor
- • Next we will introduce Genelec briefly and take you through some principles in setting up good monitoring
- • “Standard stereo pair, as we have here today”
- • Early reflections cause: - coloration of sound - blurred sound image
- •Here is how to do it, “Triangle where each sides are the equal length”Where to sit for listening in the room, symmetrical set up
- In the Monitor set up guide you can read more
- Omni directional Low frequency to narrow beam High frequency.
- • Low frequenciescontain more energy and act like “flooding water”• Short soundwaves are more directive and have less energyLowest frequency of some sound suorces.
- Free space frequency response when the loudspeaker leaves the factory.
- Bass tiltBass roll off
- 1m from the back wall will get about 15 dB down at 85Hz, -3db at 60Hz and 120Hz
- AcoustiTape how it shall be used.
- • Conventional speaker with a flat front baffle design without the Waveguide• Moving off-axis the frequency frequency becomes uneven and unnatural - e.g. due to edge diffraction
- • DCW• MDE Minimum Diffraction Enclosure results much smoother frequency response in both On- and Off-Axis
- Genelec DSP MonitorerIn The Genelec DSP loudspeaker systems we can with the AutoCal software control and calibrate the DSP loudspeaker for our room.AutoCal comes whit a Genelec measurement microphone and an interface. The Program can be down loaded from our web site.