Stam Audio EQP-2A-S – Solid-State Equalizer

Classic Passive-EQ Tone. Stereo Precision. Solid-State Punch.

Bring the unmistakable depth, weight, and musicality of one of studio history’s most coveted equalizer designs into your modern analog workflow with the Stam Audio EQP-2A-S Solid-State Equalizer.

Designed as a stereo recreation of the legendary solid-state EQP architecture, the EQP-2A-S combines the broad, musical curves engineers love for shaping lows and highs with an MEQ-inspired midrange section featuring both boost and attenuation. The result is considerably more than a vintage-style tone box: it’s a powerful stereo equalizer built for tracking, mixing, bus processing, and mastering.

At the heart of the EQP-2A-S is a carefully selected analog signal path featuring custom Sowter input transformers, US-made output transformers, Carnhill inductors, and four API 2520-style discrete op-amps. Fully stepped controls and tightly matched switching help maintain excellent channel-to-channel consistency, making the EQP-2A-S equally at home across individual sources, stereo buses, and complete mixes.

Whether you want to add authority to a kick drum, give bass more size, open up vocals, bring sheen to a stereo mix, or sculpt problematic midrange frequencies without making the source sound processed, the EQP-2A-S delivers analog EQ with character.

Vintage-Inspired EQ Tone Without Tubes

The EQP-2A-S takes the musical EQ behavior associated with classic passive equalizers and pairs it with a solid-state amplification stage.

Four 2520-style op-amps work alongside transformer-balanced circuitry to deliver a sound with weight, definition, and analog character. This makes the EQP-2A-S particularly attractive when you want the broad musical shaping of an EQP-style equalizer with the response and personality of a discrete solid-state signal path.

Premium Sowter Transformer Signal Path

Transformers play a major role in the character of classic analog equipment, and Stam Audio has taken the transformer stage seriously.

The EQP-2A-S incorporates two custom Sowter input transformers paired with two custom US-made output transformers. This transformer-balanced architecture is designed to contribute the low-frequency authority, harmonic character, and distinctive analog timbre expected from premium vintage-inspired hardware.

The result is an equalizer you can use not only for frequency shaping, but also as an analog coloration stage when your tracks or mixes need more dimension and personality.

EQP-Style Low and High Frequency Shaping

Some EQs are designed for surgical correction. The EQP-2A-S is designed to make broad tonal decisions sound musical.

Its EQP-inspired architecture is ideal for enhancing the fundamental character of a source — adding low-frequency weight, opening up the top end, or creating the polished tonal balance associated with classic analog recordings.

That makes the EQP-2A-S a compelling choice for:

• Mix bus and stereo bus processing

• Mastering and stem processing

• Kick drums and bass

• Vocals

• Drum buses

• Acoustic instruments

• Keyboards and synthesizers

• Guitars

• Tracking and re-amping

• Analog processing for in-the-box mixes

MEQ-Inspired Midrange Control

Stam Audio expands the traditional EQP concept with an MEQ-inspired mid band offering both boost and attenuation.

That additional midrange control dramatically increases the EQP-2A-S's versatility. Instead of relying only on broad low- and high-frequency shaping, you can bring important midrange information forward or reduce frequencies competing for space in a dense arrangement.

The mid-band control includes a bypass position at its center, giving you a fast way to remove the mid section from the processing path when it isn't required.

Built for Stereo Mixing and Mastering

A stereo analog EQ is only as useful as its channel matching.

Stam Audio uses fully stepped controls, with switches matched to a tight 0.1% tolerance, helping the left and right channels track accurately during stereo processing.

That precision makes the EQP-2A-S particularly useful across a mix bus, drum bus, stereo stems, keyboards, and mastering chains where maintaining a stable stereo image is critical.

And because both channels are housed within a classic 3U rackmount chassis, you get a complete stereo analog equalizer without requiring two separate mono units.

Carnhill Inductors and Premium Components

The EQP-2A-S is built around components selected specifically for this style of analog EQ.

Inside you'll find six Carnhill inductors, premium capacitors, custom transformers, and discrete 2520-style amplification. Rather than simply recreating the control layout of vintage equipment, the design focuses on reproducing the behavior and sonic character of the classic circuitry throughout the signal path.

True Bypass for Instant A/B Comparison

Want to know exactly what the EQP-2A-S is doing to your signal?

Engage true bypass and compare your processed signal against the original source. This is particularly useful during subtle mix-bus and mastering work, where even small EQ moves can have a significant effect on the overall balance of a track.

Linear Power Supply

The EQP-2A-S uses a linear power supply, maintaining the traditional power-supply approach associated with high-quality analog studio hardware.

A rear-panel 115V/230V voltage selector also makes the unit suitable for professional studios in different regions.

Hand-Built Analog Hardware

Each EQP-2A-S is handmade in Chile with careful attention paid to component selection, assembly, channel matching, and reliability.

Stam Audio also subjects each unit to an extended 72-hour burn-in process before it leaves the workshop.

For engineers who want tactile hardware, premium analog components, and a signal path designed around the sonic behavior of classic studio equalizers, the EQP-2A-S offers a serious centerpiece for the analog rack.

Key Features

• Stereo solid-state EQP-style analog equalizer

• Classic vintage-inspired EQ circuit architecture

• EQP-style musical low- and high-frequency shaping

• MEQ-inspired midrange section

• Mid-band boost and attenuation controls

• Center bypass position for the mid band

• Two custom Sowter input transformers

• Two custom US-made output transformers

• Four API 2520-style discrete op-amps

• Six Carnhill inductors

• Fully stepped controls

• Switches matched within 0.1% tolerance for accurate stereo operation

• True bypass

• Premium capacitors

• Linear power supply

• 3U rackmount construction

• 250mm chassis depth

• 115V/230V selectable operation

• Handmade in Chile

• 72-hour burn-in testing

Technical Specifications

 

Specification	Details
Product Type	Stereo Solid-State Analog Equalizer
EQ Architecture	Vintage EQP-style
Channels	Stereo / 2-channel
Midrange Section	MEQ-inspired boost and attenuation
Input Transformers	2 x Custom Sowter
Output Transformers	2 x Custom US-made
Op-Amps	4 x SA-25 / API 2520-style
Inductors	6 x Carnhill
Controls	Fully Stepped
Switch Matching	Within 0.1% tolerance
Bypass	True Bypass
Power Supply	Linear
Rack Size	3U
Depth	250mm
Mains Voltage	115V / 230V Selectable
Manufacturing	Handmade in Chile

Why Choose the Stam Audio EQP-2A-S?

The EQP-2A-S makes sense when you don't want an equalizer that merely changes frequencies — you want one that contributes to the sound of the record.

Its combination of transformer-balanced circuitry, Carnhill inductors, discrete 2520-style amplification, stepped stereo controls, classic EQP-style curves, and additional MEQ-inspired midrange control gives you a versatile analog processor capable of moving from individual tracks all the way to the stereo mix.

Use it for subtle half-step tonal decisions or more obvious analog sculpting. Add weight. Introduce presence. Smooth the midrange. Open the top end. Give a digital mix another layer of analog dimension.

For producers, recording engineers, mixing engineers, and mastering studios looking for a stereo Pultec-style solid-state equalizer, the Stam Audio EQP-2A-S delivers vintage-inspired musicality with the precision and workflow demanded by a modern studio.