ASHLY ne24.24M [15/28] Operating manual ne24 4m matrix processor
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Operating Manual - ne24.24M Matrix Processor
The steeper the slope, the more abruptly the “edges” of the pass band will drop off. There is no best lter slope for
every application, so experiment to see which one sounds most pleasing in a specic system. The Ashly default crossover l-
ter is 24dB/octave Linkwitz-Riley, 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-off frequency, affecting 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 offer a summary of the three lter types as used in the ne24.24M crossovers.
Butterworth
Butterworth lters individually are always -3dB at the displayed crossover frequency and are used because they have
a “maximally at” passband and sharpest transition to the stopband. When a Butterworth HPF and LPF of the same crossover
frequency are summed, the combined response is always +3dB. With 12dB per octave Butterworth crossover lters, one of the
outputs must be inverted or else the combined response will result in a large notch at the crossover frequency.
Bessel
These lters, as implemented on the ne24.24M, are always -3dB at the displayed crossover frequency. Bessel lters
are used because they have a maximally at group delay. Stated another way, Bessel lters have the most linear phase response.
When a Bessel HPF and LPF of the same crossover frequency are summed, the combined response is +3dB for 12dB/oct, 18dB/
oct, and 48dB/oct Bessel lters, and -2dB for 24dB/oct Bessel lters. One of the outputs must be inverted when using either
12dB/oct or 18dB/oct Bessel crossover lters or else the combined response will have a large notch.
Linkwitz-Riley
The 12 dB/oct, 24dB/oct, an 48dB/oct Linkwitz-Riley lters individually are always -6dB at the displayed crossover
frequency, however the 18dB/oct Linkwitz lters individually are always -3dB at the displayed crossover frequency. The reason
for this is that Linkwitz-Riley lters are dened in terms of performance criterion on the summing of two adjacent crossover
HPF and LPF lters, rather than dened in terms of the pole-zero characteristics of individual lters. The 18dB/oct Linkwitz-
Riley individually are 18dB/oct Butterworth lters in that they have Butterworth polezero characteristics and also satisfy the
criterion for Linkwitz-Riley lters. When a Linkwitz-Riley HPF and LPF of the same crossover frequency are summed, the
combined response is always at. With 12dB/oct Linkwitz-Riley crossover lters, one of the outputs must be inverted or else
the combined response will have a large notch at the crossover frequency.
8.2c Output Delay
Output delay can be used to time align discrete drivers within a cabinet or
cluster using short delay times, or align multiple drivers in different locations using
longer delay times. The following example illustrates a use of short delay to time align
speakers within a group: A typical three way speaker cluster has low end, midrange,
and high frequency drivers all located near one another. The different 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 the same signals (at the cross-
over points) arriving at the cluster “wavefront” at different times, creating undesirable
wave interaction such as frequency peaks or cancellation. The solution in this case,
rather than xing the frequency anomalies with EQ, 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 delay at all.
The minimum adjustment is 0.02 milliseconds, or about 1/4 inch. When appropriate,
always time align the loudspeakers before applying EQ to the outputs of the ne24.24M.
Содержание
- Consignes de sécurité à lire attentivement 2
- Fcc compliance 2
- Important safety instructions 2
- Operating manual ne24 4m matrix processor 2
- This device complies with part 15 of the fcc rules operation is subject to the following two conditions 1 this device may not cause harmful interference 2 this device must accept any interference received including interference that may cause undesired operation 2
- Operating manual ne24 4m matrix processor 3
- Table of contents 3
- Ac power requirements 4
- Introduction 4
- Operating manual ne24 4m matrix processor 4
- Through the supplied power line cord 4
- Unpacking 4
- Warning this apparatus must be earth grounded 4
- Com led 5
- Expansion module leds 5
- Front panel features 5
- Main input channel leds 5
- Main output channel leds 5
- Operating manual ne24 4m matrix processor 5
- Preset number 5
- Rs 232 dataport 5
- Expansion modules 6
- Input connections 6
- Logic inputs preset recall 6
- Operating manual ne24 4m matrix processor 6
- Output connections 6
- Rear panel features 6
- 100 ethernet control jack 7
- 5v remote level control 7
- Data in data out connection 7
- Operating manual ne24 4m matrix processor 7
- Rs 232 dataport 7
- Ac inlet and power switch 8
- Expansion module installation 8
- Factory reset switch 8
- Operating manual ne24 4m matrix processor 8
- Operating manual ne24 4m matrix processor 9
- Software 9
- A input mute 10
- Audio functions 10
- B input preamp 10
- C phantom power 10
- D push to talk mic 10
- E signal generator 10
- F input gain 10
- G input delay 10
- Input functions 10
- Operating manual ne24 4m matrix processor 10
- H input eq 11
- Operating manual ne24 4m matrix processor 11
- I noise gate 12
- J autoleveler 12
- Operating manual ne24 4m matrix processor 12
- K ducker 13
- L matrix routing 13
- M input remote level control 13
- Operating manual ne24 4m matrix processor 13
- A output matrix mixer input mixer 14
- B hpf lpf crossover 14
- Operating manual ne24 4m matrix processor 14
- Output audio functions 14
- Output functions 14
- C output delay 15
- Operating manual ne24 4m matrix processor 15
- D output eq 16
- E output gain 16
- F output remote level control 16
- G output compressor limiter 16
- Operating manual ne24 4m matrix processor 16
- Copying settings to another input or output 17
- Device options 17
- H output mute 17
- Operating manual ne24 4m matrix processor 17
- Other software functions 17
- Preset options 17
- Security 17
- Metering 18
- Operating manual ne24 4m matrix processor 18
- Remote control 18
- Wr 1 volume control 18
- Operating manual ne24 4m matrix processor 19
- Wr 1 volume control and preset recall 19
- Wr 2 preset recall 19
- Operating manual ne24 4m matrix processor 20
- Wr 5 programmable zone controller 20
- Newr 5 networked programmable zone controller 21
- Operating manual ne24 4m matrix processor 21
- Rd 8c rw 8c remote level controller 21
- Ashly remote application for ipad 22
- Fr 8 and fr 16 networked programmable fader controllers 22
- Operating manual ne24 4m matrix processor 22
- Gpo logic output 23
- Operating manual ne24 4m matrix processor 23
- Troubleshooting tips 23
- Operating manual ne24 4m matrix processor 24
- Specifications 24
- Ashly audio inc limited warranty usa only 27
- Operating manual ne24 4m matrix processor 27
- Operating manual ne24 4m matrix processor 28
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