#SIMPLE DELAY HAAS EFFECT FULL#

Since the two speakers are exactly time alligned the delay speaker should hardly be noticable.ģ. Use your equalizer to adjust the speaker to the room and test and adjust the speaker volume again so that the delay speaker volume is just a little louder than the sound from the mains, maybe 3 to 6 decibels. If not, adjust the delay amp level accordingly. This should happen at the outer edge of the delay's coverage area.

After the delay time has been set, walk back to notice where the sound begins to drop off. Set your analyzer mic at this spot and use your tool (Smaart, TEF, SIM, ears) to set the time delay exactly on time.Ģ. The farthest area before you get into the next delay zone. Typically this spot would be near the farthest coverage area of the delay. We need to pick the correct spot to set the exact time alignment for the delay speaker.

And quite often the additional tweaking will result in a perfectly aligned system with the help of 'The Haas Effect'.ġ. Additional tweaking is certainly the right approach. For others, they will tweak the system to make it less noticeable by playing with relative volume and offset timing until the systems sounds as natural as possible. To some technicians this timing shift is seen as a problem that just can't be fixed. What this means is that at this position the sound from the delay speaker is reaching the listener 5 milliseconds later than the sound from the main speaker.

Walk ten feet towards the stage and the offset between the main speaker and delay speaker will be about 5 milliseconds. So, although the listener has shortened his distance/time to the mains by almost a millisecond he has only changed his distance/time from the delay speaker by half a millisecond. This happens because as the listener walks one foot towards the main speaker he will only be, perhaps, 1/2 foot closer to the delay because he is approaching the delay at an angle. However, as the listener moves forward or back from this location the time alignment between the two speakers changes slightly by as much as five or ten milliseconds. At this location the listener will hear sound from the main speaker and the delay speaker at the same moment in time. When an audio technician measures and sets the timing for a delay speaker his time setting is only exact for one measured distance from the stage. I will take this definition one step farther to explain how this phenomena can be applied to timed delay speakers in a venue. 363, December, 1949 reproduced in the United States as 'The Influence of a Single Echo on the Audibility of Speech,' J. Ehrenberg, Building Research Station, Watford, Herts., England Library Communication no. (After Helmut Haas's doctorate dissertation presented to the University of Gottingen, Gottingen, Germany as 'ÃƒƒÂœber den Einfluss eines Einfachechos auf die HÃƒƒÃ‚Â¶rsamkeit von Sprache ' translated into English by Dr.

#SIMPLE DELAY HAAS EFFECT FULL#

The Haas Effect describes how full stereophonic reproduction from only two loudspeakers is possible. Sound arriving at both ears simultaneously is heard as coming from straight ahead, or behind, or within the head. Sensory inhibition describes the phenomena where the response to a first stimulus causes the response to a second stimulus to be inhibited, i.e., sound first entering one ear cause us to 'not hear' the delayed sound entering into the other ear (within the 35 milliseconds time window). This is the hearing example of human sensory inhibition that applies to all our senses. In essence we do not 'hear' the delayed sound. The Haas Effect is true even when the second arrival is louder than the first (even by as much as 10 dB.). If the later arrivals are longer than this, then two distinct sounds are heard. The Haas Effect tells us that humans localize a sound source based upon the first arriving sound, if the subsequent arrivals are within 25-35 milliseconds. Due to the head's geometry (two ears spaced apart, separated by a barrier) the direct sound from any source first enters the ear closest to the source, then the ear farthest away. Haas Effect Also called the precedence effect, describes the human psychoacoustic phenomena of correctly identifying the direction of a sound source heard in both ears but arriving at different times. Lets start with the official definition as published in December, 1949: Over the years I have heard dozens of theories from dozens of audio technicians about the 'Haas Effect'.

Simple delay haas effect