The AudioScape AS78 Dual Peak Limiter is a high-precision, dual-channel compressor and peak limiter that delivers transparent compression, fast transient control, harmonic saturation, and versatile sidechain filtering, incorporating a dual FET-based topology with independently controlled input and output levels, stereo-linked or discrete dual-channel operation, and a switchable high-pass filter for nuanced sidechain triggering, making it an indispensable tool for audio professionals.

Inspired by a Studio Classic

Drawing inspiration from the original late-1970s model, the AS78 is a faithful reimagining of a revered studio compressor/limiter, known for its accuracy, unique sonic character, and reliability. This powerhouse has remained a staple in professional studios for decades, delivering dynamic control that enhances mixes without compromising clarity.

Dual-Channel Flexibility

The AS78 offers two independent channels, each with dedicated threshold and ratio controls. Engineers can opt for the Stereo Mode, where a single set of Attack and Release controls govern both channels, and the highest signal peak dictates the gain reduction for both channels simultaneously. Alternatively, in A/B Mode, the dynamics of each channel operate independently, with separate gain reduction behaviour while still sharing common Attack and Release settings. This configuration allows seamless adaptation to a wide range of mixing and mastering applications.

Advanced Sidechain High-Pass Filtering

A key enhancement in AudioScape’s design is the addition of a Sidechain High-Pass Filter, switchable between 80Hz and 120Hz. By filtering out excessive low-frequency energy, this feature enables more refined and controlled sidechain triggering, preserving the natural balance of the mix while keeping the compression responsive and transparent.

Transparent Yet Characterful Compression

Engineers and producers can harness the AS78 to achieve everything from subtle transient softening to aggressive peak limiting, all without introducing unwanted artefacts. Its ultra-fast response ensures crisp and precise control over audio dynamics, maintaining clarity even when driven hard. Whether taming unruly peaks, adding punch, or sculpting a mix, the AS78 excels in delivering sonic control without compromising musicality.

Versatility in Professional Applications

Designed for adaptability across multiple studio scenarios, the AS78 is equally at home across stereo busses, drum stems, background vocals, or acoustic guitar tracks. Whether it is glued across a mix for cohesive dynamics or inserted on individual sources for tailored transient shaping, it provides a level of sonic control that enhances depth, punch, and clarity in any mix.

The Design and Development Process

The development of the AS78 stemmed from industry demand for a modern take on this legendary compressor. With input from engineers such as Manny Nieto, who supplied an original unit to guide the design, AudioScape ensured absolute authenticity in its sonic behaviour, from subtle compression to extreme limiting. Further refinements were influenced by Ryan Hewitt, who, while mixing Unlimited Love by the Red Hot Chili Peppers, suggested the addition of a blend control and simple sidechain high-pass values—both now integral features of the AS78. David McDonald played a crucial role in refining the PCB design, ensuring precision and reliability in every unit.

Handcrafted Quality with No Compromises

AudioScape Engineering Co. is committed to producing boutique analogue hardware without the exorbitant price tag. Every AS78 unit undergoes meticulous hand-assembly in small batches at the company’s Daytona Beach, Florida facility. This dedication to craftsmanship ensures that each limiter is a robust, high-performance tool built to endure years of professional use. With rigorous research, development, and testing behind every product, the AS78 stands as a testament to AudioScape’s commitment to quality, authenticity, and superior sonic performance.