AUDIO MERGE / CF67B

The Audio Merge CF67B is a 2U rack-format variable passive high/low-pass filter for music production, inspired by the Altec 9067B.

■ Passive High-Pass & Low-Pass Filter

Audio Merge CF67B

While designed to create unique sound effects, unlike the original, it incorporates a DSP verification process to accurately preserve the acoustic characteristics of classic Altec vintage filters.

Furthermore, unique controls such as BELL and MODE enable precise sound shaping at every stage of production. Variable filters are essential tools in broadcasting, recording, and audio playback, and are particularly effective in creating sound effects and special effects. The CF67B combines a wide range of functionality with intuitive operation to achieve the precise control of the audio spectrum required for professional use.

The variable step filter allows for instant bandwidth limiting across a wide transmission bandwidth, and independent controls with 11 positions and OFF for both high and low frequencies enable diverse sound shaping by overlapping both frequency bands. Moreover, its completely passive structure uses only inductors, capacitors, and resistors internally, requiring no power supply. The noise floor and S/N ratio depend on the performance of the connected source device, just like other passive equipment.


While the original Altec 9067B and Langevin 255A were designed for maximum power transfer, the CF67B employs an impedance bridging method designed for maximum voltage transfer to suit modern audio systems, and also features a ""600"" mode that replicates the behavior of a vintage 600Ω system when needed.

Product specifications

MAIN

""Number of channels: 1

""Frequency response: +/-0.5dB 10Hz-70kHz @ OFF

""Input impedance: 600Ω

""Output impedance: 600Ω

""Insertion loss

""BELL: 0dB

""600: 6dB

""Max input level: +38dBu

""THD: < 0.01% @ 1kHz +17dBu

""Power Consumption: 0W - completely passive

""Parallel IO:

""Front: 1/4""

""Read: 1/4"" & XLR

""True Bypass: yes

CUTOFFS & MODES

""Number of cutoffs per filter: 10

""HPF: 70C, 100C, 150C, 250C, 500C, 1KC, 2KC, 3KC, 5KC, 7.5KC

LPF: 250KC, 500KC, 1KC, 2KC, 3KC, 4KC, 5KC, 6KC, 8KC, 10KC

Modes: 600 and BELL

Damping levels (BELL): 6

DIMENSIONS

Height: 88mm ~ 3.46""

Width: 483mm ~ 19.02""

Depth: 110mm ~ 4.33""

Weight: 2.7kg

About AudioMerge

AudioMerge is an audio equipment brand from Barcelona, ??Spain.

Founded in 2021 by two Spanish sound engineers, this brand

develops and manufactures high-end analog filters for dub music and dance music artists of various genres.