The Lang PEQ-2 Program Equaliser stands as a hallmark of innovation in audio processing from the mid-20th century. Designed with precision silicon circuitry and advanced equalisation networks, the Lang PEQ-2 was crafted to offer unparalleled control for enhancing or correcting sound in recording and playback. Its introduction provided engineers with a powerful tool to shape the tonal quality of audio material, setting it apart as a significant addition to professional audio gear.
The Lang PEQ-2 was built with stability and reliability at its core, featuring non-drift equaliser components and high-Q toroidal equaliser coils for precise frequency shaping. This level of precision was complemented by bridge-selected capacitors and a hermetically sealed design to ensure consistent performance in demanding studio environments. Its stainless steel, acid-etched control panel ensured durability while maintaining an aesthetic appeal suited to professional settings.
The equaliser operated with remarkably low hum and noise levels, exceeding standards of the time with better than -90 dBm performance. The inclusion of a silicon planar transistor amplifier and solid-state regulated power supply ensured efficient and consistent operation, with low power consumption making it practical for extended sessions.
Designed to integrate seamlessly into professional setups, the Lang PEQ-2 featured a standard 19-inch rack mount, making it suitable for studios of all sizes. Its balanced, unbalanced, or ungrounded operation provided flexibility across various systems. The units multi-position equalisation frequency selectors and adjustable 4 to 10 dB gain offered engineers the precision and range needed to meet diverse audio challenges, from subtle enhancements to significant tonal corrections.
For broadcast and professional audio production, the Lang PEQ-2 also incorporated telephone-style equalisation in-out keys, further broadening its use cases. The robust design allowed for continuous duty operation, while the zero insertion loss ensured that audio fidelity remained uncompromised.
The Lang PEQ-2’s innovative approach to equalisation and unmatched durability made it a go-to choice for audio professionals during its era. With a meticulous design philosophy and premium components, it remains a revered piece of audio engineering history. Its release marked a significant milestone in equaliser technology, embodying the precision and reliability sought by studios and broadcast professionals.
Today, the Lang PEQ-2 is remembered not only for its groundbreaking technology but also for its role in shaping the sound of countless recordings during the golden age of analog audio. Its influence continues to be felt, with modern recreations and reissues drawing inspiration from this classic equaliser’s unmatched performance.
Equalisation Bands:
- High frequency peak boost: 0 to +18 dB at 2,500, 3,750, 5,000, 7,500, 10,000, 12,000, 15,000, or 20,000 Hz.
- High frequency shelf droop: 0 to -16 dB at 2,500, 5,000, 7,500, 10,000, 15,000, or 20,000 Hz.
- Low frequency shelf boost: 0 to +12 dB at 20, 30, 40, 60, 80, 120, 160, or 240 Hz.
- Low frequency shelf droop: 0 to -18 dB at 25, 50, 100, or 200 Hz.
