HPF or LPF Frequency
Channel 1-8

Operating Manual - PROTEA SYSTEM II 4.24C Crossover / System Processor

Input (Long) Time Delay For Remote Speakers

Speaker on

Main Stage

Secondary Speaker

200 ft from Main Stage

Same sound arrives at two different times.

Fix by delaying secondary speakers 177mS.

of the venue with direct line-of-sound to multiple loudspeakers. The solution is to delay the audio signal to the loudspeakers located beyond the main stage area, so that sound comes out of the distant loudspeakers at the exact time that sound from the main stage loudspeakers arrives. Within the Protea 4.24C, up to 682 milliseconds of time delay are available on each input channel, allowing secondary loudspeaker clusters to be time aligned with the primary speakers up to 771 feet (235m) away from the main stage area.

Output channels have time delay as

well, but much less than the inputs. This is

Output (Short) Time Delay

 

For Driver Alignment

because output delay is best used to align dis-

 

crete drivers within a speaker cabinet or clus-

 

 

 

 

Example:

12 Inches

 

 

 

 

 

 

 

 

ter, normally quite close together. For example,

 

 

 

 

 

 

 

 

 

 

 

a typical three way speaker cluster would have

 

 

 

 

 

 

High - No Delay

 

 

 

 

 

 

low end, midrange, and high frequency drivers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

all located near one another. The different driv-

 

 

 

 

 

 

Midrange Delay

ers for each frequency band are not necessar-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12 Inches = 0. 9mS

ily the same physical depth with respect to the

 

 

 

 

 

 

 

front of the loudspeaker cluster, so there ex-

 

 

 

 

 

 

 

ists the problem of same signals (at the cross-

 

 

 

 

 

 

Low Delay

over points) arriving at the cluster "front" at

 

 

 

 

 

 

8 Inches = 0. 6mS

 

 

 

 

 

 

 

different times, creating undesirable wave in-

 

 

 

 

 

 

 

teraction and frequency cancellation. The so-

 

 

 

 

 

 

 

lution, again, is to slightly delay the signal to

 

 

 

Example:

8 Inches

 

 

 

 

 

 

 

 

 

 

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 4.24C is adjusted only by time, the corresponding dis- tance in both feet and meters is always shown as well.

4.6d Crossover (Xover)

Crossover functions on the Protea 4.24C are available only on the

eight output channels . Every channel's crossover consists of a high pass filter (HPF) and a low pass filter (LPF), along with the frequencies and filter types used. Each output's cross- over section is essentially a bandpass filter, making it necessary for the user to map out ahead of time which outputs frequencies and types accordingly. Note: determines the upper frequency limit.

Crossover LCD Display

Crossover

 

 

 

HPF and LPF

 

 

 

 

 

CROSSOVER 1

HPF

 

Select

 

 

19.7Hz 24dB-Lnkwtz

 

Slope and

 

 

 

 

 

Response

 

 

 

 

 

will be used for the various frequency bands, and set the overlapping filter The HPF determines the lower frequendy limit of the signal, while the LPF

The frequency range for the high pass filter (HPF) is from 19.7Hz to 21.9kHz, with an option to turn the filter off at the low end of the frequency selection. The low pass filter (LPF) offers the same frequency range, with the "off" option at the high end of the frequency selection.

There are eleven types of filters available in the crossover section, each suited to a specific preference or purpose. The slope of each filter type is defined by the first characters in the filter type, 12dB, 18dB, 24dB, or 48dB per octave. The steeper the slope, the more abruptly the "edges" of the pass band will drop off. There is no best filter

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Ashly 4.24C manual Crossover LCD Display, 6d Crossover Xover
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4.24C specifications

Ashly 4.24C is a versatile and powerful audio processor that has gained popularity among sound engineers and audio professionals for its robust features and innovative technology. Designed specifically for live sound reinforcement, installed sound systems, and broadcast applications, this digital signal processor stands out in a crowded market by combining flexibility, performance, and ease of use.

One of the key features of the Ashly 4.24C is its comprehensive digital signal processing capabilities. With 24 individual input channels and 24 outputs, the device supports extensive routing options, enabling audio engineers to manage complex setups with ease. The processor includes a 4-band parametric equalizer, compressor, limiter, and noise gate on every channel, allowing for precise sound tailoring. Additionally, the inclusion of 16 built-in presets makes it easy to switch between different audio settings in live sound environments.

The Ashly 4.24C utilizes cutting-edge technologies to achieve superior sound quality. D/A and A/D converters are of high fidelity, ensuring that the audio signals remain clear and detailed throughout the processing chain. The device also features 24-bit resolution at sample rates up to 96 kHz, ensuring that even the most demanding audio applications are handled with professional quality. This emphasis on audio fidelity is particularly important in live sound and broadcast applications, where every nuance of sound can significantly impact the overall experience.

Ease of use is another standout characteristic of the Ashly 4.24C. The unit comes equipped with a user-friendly interface that includes an intuitive touchscreen, which simplifies the navigation of its numerous controls and settings. This graphical interface allows for greater visual feedback, making it easier for sound engineers to make adjustments during performances or broadcasts without needing to memorize complex configurations.

In terms of connectivity, the Ashly 4.24C offers a variety of inputs and outputs, including analog XLR, digital AES/EBU, and even optional Dante networking capability for seamless integration into modern networked audio systems. This flexibility ensures that the processor can fit into various setups, from small venues to large concert halls.

Overall, the Ashly 4.24C combines advanced audio processing technology with user-centric design, making it an excellent choice for professionals seeking high-quality sound solutions. Its multitude of features and capabilities ensure it meets the demands of contemporary audio applications while maintaining an accessible and manageable interface for users.
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