EQUALIZER IMPLEMENTATION
IN AN ENCLOSURE
Objective: Amplify, often areas where there is attenuation by local and mitigate those that have excessive noise gain will lead us to the matching sound. For a professional is a clear need for equalizers versatile enough to compensate for local features that can be very different.
Basic form.
This process is much faster and more accurate
The acoustic response is only valid for the conditions under which testing is performed, ie, for local people, furniture, coatings, temperature, existing at the time of the test, etc.
: different local areas give different answers so tests are needed at various points to define the average equalization using
(or the particular equalization zones, more sophisticated systems)
IMPORTANT NOTE: It is emphasized that the equalizer used for these purposes is an element of compensation of irregularities characteristic of the combined system / local, but not be used for correct defects or deficiencies intrinsic electro elements.
should not be thought that an equalizer will correct the defects in response to a bad speaker, on the contrary, if we try to amplify over a frequency band to hide such defects is likely to get only increase distortion and degrade system response.
In general, it should first know the characteristics of the premises, and in terms of these, choose the appropriate speakers, once installed the same, to verify the proper functioning of the system and built-in equalizer.
If the location is intended to listen to recorded programs. (Film) before equalization is sufficient to obtain a good quality reproduction.
IN CONTROL ROOMS
is desirable that the equalization is done at the point which will be the operator, to ensure that conditions are as set similar as possible to actual operating conditions of the system.
When it comes to sound reinforcement systems involving the use of live microphones we have a serious problem. Acoustic feedback. In this case we must consider the equalization of the entire system, including the microphone. This is where local preponderación takes a lot more.
Acoustic feedback conditions and limits the maximum power supplied to the speakers. The effect is precisely in those areas of frequencies whose propagation favors the campus.
The equalizer can be used to reduce the levels of frequencies that affect and control the feedback (Feedback).
This allows us to work with a safety margin against feedback when the output level is increased.
A measure that increases the overall amplifier volume comes a point where we see the feedback, then dims the corresponding band EQ as necessary for the coupling (speakerphone) disappears.
rises again the gain to the point where the feedback appears again (which may be the same frequency as before or a different one) and re-cut the band in question. Repeating this process several times we reach a point where either we have enough power without acoustic coupling problem, or it is impossible to increase the volume without resorting to feedback. In either case you will have gained a few dB with respect to the starting position.
FREQUENCY DIVIDERS DIVIDER OR NETWORKS
PASSIVE NETWORK Built by capacitors and coils. DRAFTED
by multiamplification.
were created to extend the response of the speakers and make the reproduction of bass and treble is more efficient. The filter network divides the frequency spectrum between the low, medium and high.
Each speaker sound-system responds to the ratio of the signal within its specified frequency range, but electrically respond to anything that gets .
Explain: If we sent entire signal to each speaker, not only electric power would be wasted if not also would be submitting to the speakers overhead is therefore necessary to separate the signal into frequency ranges as speakers to use, which makes for crossover networks or crossover networks.
.- passive crossover network built by capacitors and inductors.
point or actual frequency, which are divided bass or treble frequency is called Crossing .
Graves or low frequencies 20Hz - 800Hz
about means or medium between 800Hz - Treble
6KHz High between 6KHz - 20KHz
PASSIVE NETWORK
In power systems for medium or low power, acoustic enclosures containing two or three speakers together, covering different frequency ranges and a passive crossover network .
DISADVANTAGES:
ü The output level of the crossover frequency drops a few decibels.
ü causes inter modulation distortion mainly to high levels
volumeü causes harmonic distortion at high frequencies.
ü wing produces losses that affect overall system gain.
ü reactive elements (inductors and capacitors) produce signal mismatch, once in advance and other arrears.
ACTIVE NETWORK multiamplification
For more power, this approach does not apply because the reels should be of high quality, there would be further warming would change the diameter of the conductor.
is why the division is to perform frequency prior to amplification and then amplify separately each of the signals.
multiamplification This scheme is called.
(Bi-amping in the case of two-way tri-amp in the case of three-way)
ADVANTAGES:
ü separation is performed at low frequency signal level, allowing greater flexibility of action.
ü Being able to adjust the level in each band (either your own mail filter or power amplifiers) can compensate for acoustic performance from the speakers.
Ü change is minimized because the signal phase is much easier to control the phase using active electronic components instead of passive components.
ü is reduced by inter-modulation distortion .
ü Maximizing the power of speakers
ü Easy to expand the system.
DISADVANTAGES:
ü more expensive.
