Tegeler Audio EQP-1 Passive Tube Equaliser

Analogue Magic and Precision for Modern Studio Workflows

The Tegeler Audio Classic Equalizer EQP-1 is a premium dual-mono passive tube equaliser delivering vintage Pultec-style tonal shaping with German precision engineering. Its passive LC filter network, ECC83 tube amplification stage, and custom transformers add weight, depth, and three-dimensional clarity to any source - from individual instruments to full mix buses. The EQP-1 provides the musical warmth and air that digital plug-ins cannot replicate, making it essential for recording engineers, mixing specialists, and mastering studios seeking uncompromising analogue authority.

Passive Filter Topology Meets Pure Tube Warmth
At the heart of the EQP-1 is a classic passive filter network constructed from high-grade inductors and capacitors. Unlike active equalisers that alter audio signals through continuous feedback loops, passive circuits preserve the natural phase coherence and harmonic integrity of your source material. The audio signal is subsequently amplified by a handcrafted ECC83 tube stage and coupled through custom-wound input and output transformers. This architecture infuses your audio with rich harmonic density, pleasing warmth, and analog authority the moment the unit is inserted into your signal chain — even when the EQ controls remain at zero.

Legendary Low-End Sculpting via Simultaneous Boost and Cut
The EQP-1 unlocks the famous Pultec low-end trick, allowing engineers to boost and attenuate the same low-frequency band simultaneously at 20 Hz, 30 Hz, 60 Hz, or 100 Hz. Because the boost and cut curves operate on slightly offset frequency slopes, combining both controls produces a tight, punchy low frequency push while clearing out muddy lower-mid resonance. Kick drums gain foundational sub-bass impact without boomy smear, while bass guitars stay articulate, focused, and locked firmly in the mix.

Silky Smooth Highs and Dual-Mono Flexibility
For high-frequency enhancement, the EQP-1 features a peak boost section spanning 3 kHz to 20 kHz with a dedicated variable bandwidth control, complemented by a smooth high-frequency shelving cut at 5 kHz, 10 kHz, and 20 kHz. This allows you to add silky top-end sheen and vocal presence without introducing harshness or digital grain. With two fully independent channels and hard relay bypass controls, the EQP-1 functions seamlessly as two separate mono equalisers during tracking or as a perfectly matched stereo unit across the mix bus and mastering chain.

Main features:

• Passive Pultec-inspired LC equaliser circuit utilizing premium inductors and capacitors.
• Dual-mono two-channel architecture suitable for independent tracking or stereo mix bus duties.
• Class-A tube amplification stage powered by high-grade ECC83 vacuum tubes.
• Custom input and output audio transformers for added harmonic richness and signal density.
• Simultaneous low-frequency boost and attenuation at 20 Hz, 30 Hz, 60 Hz, and 100 Hz.
• High-frequency peak boost from 3 kHz to 20 kHz with variable bandwidth control.
• High-frequency shelving cut options at 5 kHz, 10 kHz, and 20 kHz for taming sibilance.
• True relay hard bypass per channel for transparent signal comparison.
• Balanced XLR inputs and outputs for seamless studio connectivity.
• Stepped rotary controls ensuring precise channel matching and repeatable mastering recall.
• Handcrafted in Berlin, Germany with a robust 2U rackmount chassis.

Tech Specs:

• Product Category: Dual-Mono / Stereo Passive Tube Equaliser
• Frequency Response: 20 Hz – 22 kHz (±0.5 dB)
• Dynamic Range: ≥ 110 dB
• Max Input & Output Levels: +22 dBu Maximum Input | +22 dBu Maximum Output
• Impedance: Input: ≥ 2.4 kΩ | Output: < 600 Ω
• Tube Complement & Transformers: ECC83 / 12AX7 Vacuum Tubes | Custom Balanced Input & Output Transformers
• Low-Frequency Bands: 20 Hz, 30 Hz, 60 Hz, 100 Hz (Shelving Boost & Cut, ±12 dB)
• High-Frequency Boost: 3 kHz, 4 kHz, 5 kHz, 6 kHz, 8 kHz, 10 kHz, 12 kHz, 16 kHz, 20 kHz (Peak, ±12 dB) with Variable Bandwidth (Q)
• High-Frequency Cut: 5 kHz, 10 kHz, 20 kHz (Shelving Attenuation, ±12 dB)
• Audio Connectivity: 2 x XLR Female Inputs (Balanced) | 2 x XLR Male Outputs (Balanced)
• Bypass Mode: Relay Hard Bypass (Per Channel)
• Form Factor & Dimensions: 2U 19-inch Rackmount Chassis | 483 x 89 x 250 mm
• Weight: 5.0 kg
• Power Supply & Consumption: 110 V – 230 V AC, 50 / 60 Hz | < 25 W
• Discover Tegeler Audio Classic Equalizer EQP-1: https://www.tegeler.com/en-US/ClassicEqualizer