Merging Vintage Analog Warmth with Modern Precision
At Audio Merge, we are dedicated to bridging the gap between timeless analog sound and cutting-edge technology. Our handcrafted audio tools are inspired by the golden era of studio equipment, meticulously designed to capture the warmth, depth, and character of classic gear while seamlessly integrating into modern production environments.
From passive filters and studio effects to custom-built analog processors, every unit we create is crafted with precision, tested with DSP validation, and engineered to deliver pure, uncolored sound—just as the pioneers of audio intended. Whether you’re shaping dub echoes, sculpting frequencies, or enhancing your mix with rich harmonic textures, Audio Merge provides the tools to bring your sonic vision to life.
Welcome to Audio Merge.
An Analog Filter with Vintage Flavour for the Modern Studio
For audiophiles who appreciate the warm, authentic sound of an analog filter, the King Tubby’s Big Knob (KTBK) delivers the same classic tone as the Altec 9069B, a vintage audio processor from the 60s, known for its exceptional control over sound. The KTBK1B unit features two additional switches— a mode selector and a resonance leveler— allowing for flexible filter response adjustments, making it perfect for modern music studios and various stages of the music production process.
- Passive LC Filter
- Replica of Altec 9069B aka Big Knob
- 3rd-Order High Pass Filter
- 10 Stepped Cut-off Frequencies
- Mode Selector and a Resonance Leveler
- 3 Modes: BELL, 600Ω, NOTCH
- Designed by Reverse Engineering techniques
- Customized Multi-Tap Inductor
- Robust DSP Validation
- Fully Analog Signal Path
- Handbuilt with Love in BCN
Passive filters for analog and vintage audio
At Audio Merge we develop high-precision passive filters designed for those seeking classic sound with modern technical reliability. Each unit is hand-assembled in Barcelona and goes through a DSP validation process that guarantees tonal consistency, sonic character, and the real-world behavior of every filter.
Our filters deliver musical control, personality, and professional precision—ideal for producers, engineers, and studios working with analog, vintage, and hybrid audio systems.
Why choose Audio Merge?
- Classic sound with modern reliability.
- Total transparency: real specifications, no embellishments.
- DSP validation, ensuring consistent behavior (maximum deviation: half a semitone).
- Premium components: WIMA capacitors and ELMA A04 switches.
- Hand-assembled in Barcelona, with exhaustive quality control.
- Boutique design, laboratory-grade precision.
No other boutique brand combines analog craftsmanship with such a rigorous digital validation process.
User experience and testimonials
Our clients—electronic producers, mix engineers, and recording studios—highlight:
- Professional quality from the very first use.
- Stable, predictable behavior thanks to DSP validation.
- Close, clear, and detailed pre- and after-sales support.
- Authentic vintage sound, but with the precision modern studios need.
Our units are used in analog/digital hybrid studios, in live dub and electronic performance environments, as well as in productions of techno, dub, ambient, lo-fi, IDM, house, and more.
Frequently asked questions
Do I need an external power supply?
No. They are completely passive devices.
Are they compatible with vintage and modern gear?
Yes. They are designed to integrate without any additional adjustments.
Is DSP validation on each unit relevant?
Yes. We do not allow deviations greater than half a semitone.
Is there a digital version (plugin)?
We are working on virtualizing our circuits for the digital market.
Choose your ideal passive filter
The perfect union of audio hardware with vintage analog sound, premium components, handcrafted construction, and advanced digital validation.
