Architect’s and Engineer’s Specifications

The Digital Signal Processor (DSP) shall provide two independent channels of DSP for signal delivery to QSC DataPort equipped power amplifiers. The processing shall be distributed with the DSP module mounted directly to the rear of the power amplifiers.

Output Power Limiter—For each audio channel, the DSP shall provide a power limiter that is assignable anywhere in the signal chain and can be switched on or off. The limiter shall provide the following adjustments: gain, threshold, attack time, and release time.

High- and Low-PassCrossovers—For each channel of audio, the DSP will provide high-pass and low-pass crossovers that are assignable anywhere in the audio chain. The crossovers must be capable of being switched in or out of the signal chain. The DSP shall provide the following crossover responses:

Butterworth (6,12,18,24 dB per octave slope) Bessel (6,12,18,24 dB per octave slope) Linkwitz-Riley (12 & 24 dB per octave slope)

High- and Low-Pass Shelf Filters—For each audio channel, the DSP shall provide high-pass and low-pass shelf filters that are assignable anywhere in the audio chain. The shelf filters must be capable of being switched in or out of the signal chain. The DSP shall provide the following shelf filter adjustments: variable corner frequency, variable gain, and variable slope.

Compressor— The DSP shall provide a signal compressor that is assignable anywhere in the signal chain. It shall have adjustable threshold, attack time, release time, and compression ratio.

Mixer— The DSP shall provide multiple 2-to-1 mixers.

Polarity— The DSP shall provide for polarity reversal.

Contact Closure I/O—The DSP shall provide a trigger input usable for contact-closure (or other) purpose which shall be CMOS & TTL signal compatible.

Delay— The DSP shall support multiple delays with a total available delay time of at least 910 milliseconds.

Power Supply—The DSP shall be provided power through its DataPort connection to most QSC DataPort equipped amplifiers. For older amplifiers and non-QSC amplifiers, a coaxial power jack will be provided on the DSP for connection to an external power source. Power required shall be +15 VDC at 300 mA (max.).

Amplifier Interface—The DSP shall attach directly to the rear of each power amplifier. The DSP’s interface to each power amplifier shall be via an HD-15 connector (DataPort). This interface shall transmit two amplifier input audio signals as well as all control and monitoring signals. Special signal conditioning and grounding techniques shall be used in this interface to ensure negligible levels of noise and crosstalk. For non-DataPort amplifiers, there shall be mounting and interface options provided for operating with the DSP.

Amplifier Output Monitoring—When used with QSC DataPort amplifiers, the DSP shall provide clipping and protect status detec- tion at the amplifier’s output terminals.

Noise & Tone Generation--The DSP shall provide pink and white noise generation capability. It shall also provide for tone genera- tion.

Presets— The DSP shall be capable of storing at least 8 preset configurations. The control software shall provide management of these presets.

General—All audio inputs and outputs shall be balanced with a nominal input level of +4 dBu and maximum level of +21 dBu. Input and output Gain controls shall be provided. Input and post-processor output connectors shall be XLR-type.

Control— The DSP shall be configurable via RS-232 or via a networked DataPort connection.

The Digital Signal Processor shall be the QSC DSP-4.

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QSC Audio DSP-4 manual Architect’s and Engineer’s Specifications

DSP-4 specifications

The QSC Audio DSP-4 is a state-of-the-art digital signal processor designed to deliver exceptional audio performance across various applications. This versatile device caters to the needs of live sound, installations, and broadcasting, making it a popular choice among audio professionals. With a robust feature set and advanced technologies, the DSP-4 ensures seamless integration and an unparalleled audio experience.

One of the standout features of the QSC DSP-4 is its powerful processing capabilities. Equipped with a high-performance quad-core processor, it can handle complex audio tasks efficiently, allowing users to manipulate audio signals in real-time. This ensures that even the most demanding audio environments can be managed smoothly.

The DSP-4 boasts a user-friendly interface, making it intuitive for both seasoned audio engineers and newcomers alike. The device comes with a comprehensive software suite that enables users to create and modify audio configurations with ease. The drag-and-drop functionality and visual representation of signal flow simplify the process of designing intricate audio setups.

In terms of connectivity, the QSC DSP-4 offers multiple input and output options, including digital and analog connections. This flexibility allows the device to integrate seamlessly with various audio systems, whether they involve microphones, musical instruments, or other audio sources. Moreover, it supports multiple audio formats, ensuring compatibility with a wide range of equipment.

Among the notable technologies in the DSP-4 is its advanced equalization capabilities. The device features graphic and parametric equalizers that allow for precise control over frequency response, enabling users to tailor the audio output to their specific needs. Additionally, the DSP-4 includes a variety of essential audio processing tools such as compression, gating, and delay, further enhancing its functionality.

The QSC DSP-4 is designed with reliability in mind, featuring robust construction and advanced thermal management to ensure stable operation in demanding environments. Its compact form factor allows for easy installation, whether in racks, on shelves, or in custom setups.

Another noteworthy aspect of the DSP-4 is its scalability. Users can easily expand their audio setups by linking multiple units together, allowing for larger projects or more complex configurations without sacrificing performance. This scalability, combined with the device's rich feature set, makes the QSC DSP-4 a powerful tool for any audio professional.

In summary, the QSC Audio DSP-4 is a highly capable digital signal processor that combines advanced processing power, user-friendly design, and extensive connectivity options. Whether for live events or permanent installations, the DSP-4 stands out as an essential component in delivering superior audio quality.