Ashly Protea 4.8SP handleiding
Handleiding
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Operating Manual - PROTEA™ 4.8SP and 3.6SP System Processors
8
Output channels have time delay as well. Output delay is best used to align discrete
drivers within a speaker cabinet or cluster, normally quite close together. For example, a
typical three way speaker cluster would have low end, midrange, and high frequency drivers
all located near one another. The dierent drivers
for each frequency band are not necessarily the
same physical depth with respect to the front of the
loudspeaker cluster, so there exists the problem of
same signals (at the crossover points) arriving at the
cluster "front" at dierent times, creating undesir-
able wave interaction and frequency cancellation.
The solution, again, is to slightly delay the signal
to the drivers closest to the cluster front. Using
the location of the driver diaphragm farthest back
as a reference point, measure the distance to other
drivers in the cluster, and set the output delay for
each accordingly, with the driver diaphragm closest
to the front getting the longest delay and the driver
at the very back getting no output delay. Note:
Although delay in the SP is adjusted only by time,
the corresponding distance in both feet and meters
is always shown as well.
4.6d Crossover (Xover)
Crossover functions are avail-
able only on the output channels. Every
channel's crossover consists of a high
pass lter (HPF) and a low pass lter
(LPF), along with the frequencies and
lter types used. Each output's crossover section is essentially a bandpass lter, making it necessary for the user to map out ahead
of time which outputs will be used for the various frequency bands, and set the overlapping lter frequencies and types accord-
ingly. Note: The HPF determines the lower frequency limit of the signal, while the LPF determines the upper frequency limit.
The frequency range for the high pass lter (HPF) is from 19.7Hz to 21.9kHz, with an option to turn the lter o at
the low end of the frequency selection. The low pass lter (LPF) oers the same frequency range, with the "o" option at the
high end of the frequency selection.
There are 11 types of lters available in the crossover section, each suited to a specic preference or purpose. The slope
of each lter type is dened by the rst characters in the lter type, 12dB, 18dB, 24dB, or 48dB per octave. The steeper the slope,
the more abruptly the "edges" of the pass band will drop o. There is no best lter slope for every application, so experiment
to see which one sounds most pleasing in a specic system. Ashly factory default presets use all 24dB/octave Linkwitz-Riley
lters in the crossover section, but of course they can be changed to suit the application.
In addition to the frequency and slope, crossover lters can be selected as having Butterworth, Bessel, or Linkwitz-Riley
response. These refer to the shape of a lter's slope at the cut-o frequency, aecting the way two adjacent pass bands interact
at the crossover point. 24db/octave Linkwitz-Riley lters produce a at transition through the crossover region, assuming both
overlapping lters are set to the same frequency, slope, and response type. 24dB/oct Linkwitz-Riley lters are the industry
standard, the easiest to use, and the lter type recommended by Ashly. Other lter types are available, but may require polarity
switching or other adjustments for proper results. The following paragraphs oer a summary of the three lter types as used in
4.8SP and 3.6SP crossovers:
Bekijk gratis de handleiding van Ashly Protea 4.8SP, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Ashly |
| Model | Protea 4.8SP |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 2937 MB |
