Bettermaker Stereo Passive Equalizer (SPE)

The Bettermaker Stereo Passive Equalizer (SPE) is a mastering-grade digitally controlled analog equalizer that delivers the legendary sound of passive EQ circuits with the modern convenience of total recall and DAW integration. Featuring a 100% analog signal path and digitally controlled parameters, the SPE is designed for engineers who demand classic tone shaping and precise, repeatable results.

At the core of the SPE lies matched capacitors and inductors that shape its rich, musical EQ curves. With the press of a button or movement of a mouse, users can recall complex settings instantly, automate parameters directly from their DAW, and manage up to 32 snapshots — making the SPE ideal for mastering workflows with multiple tracks or clients.

Digital Control with Analog Warmth

All user interaction and parameter management are handled in the digital domain via a 32-bit microcontroller , while the audio path remains fully analog. This architecture allows for:

• Instant reset and full parameter recall
• Precise and repeatable adjustments
• Stereo-linked operation with single-point control
• DAW automation of all settings via USB and dedicated plugin

With the included plugin, users can view and control EQ settings graphically, engage a digital high-pass filter (24 dB/oct), and analyze audio using the built-in FFT analyzer . The plugin provides a hybrid workflow for digital editing with analog sonics.

EQ Design and Frequency Bands:

• Low boost/cut frequencies: 20, 30, 60, 100 Hz
• High boost frequencies: 3, 4, 5, 6, 8, 10, 12, 16, 20, 28 kHz
• High cut frequencies: 5, 10, 20 kHz
• Maximum Low Boost: 15 dB @ 100 Hz
• Maximum Low Cut: 16 dB @ 100 Hz
• Maximum High Boost: 18 dB (all frequencies)
• Control Resolution: 101 steps (Lo Boost, Lo Cut, Hi Boost, Bandwidth), 34 steps (Hi Cut)
• Output Gain: ±8 dB (0.1 dB resolution)

DAW Integration and Snapshot Recall:

• Connects via USB to Mac/PC
• Controlled with the dedicated Bettermaker SPE plugin
• Up to 32 snapshots per session, recallable by automation
• Hybrid workflow with digital filter curve preview and analog curve overlay

Technical Specifications:

• Maximum Input Level: +24 dBu (balanced, 48kΩ input impedance)
• Maximum Output Level: +27 dBu (balanced, 50Ω + 50Ω output impedance)
• Nominal Audio Level: +4 dBu
• Frequency Response: 7 Hz – 30 kHz (-0.5 dB)
• Frequency Flatness: ±0.2 dB (20 Hz – 20 kHz)
• Dynamic Range: 101 dB (20 kHz BW, +24 dBu)
• THD+N: 0.009% (+4 dBu, 20 kHz BW)
• THD: 0.0025% (+4 dBu, 1 kHz)
• CMRR: > 70 dB (20 Hz – 20 kHz)
• Crosstalk: > 88 dB (20 Hz – 20 kHz, +18 dBu)
• Enclosure: 2U height, 140 mm depth
• Power Supply: 100–240VAC (included adapter), 15W max (2W standby)

The Bettermaker Stereo Passive Equalizer is the ultimate tool for mastering engineers who want the warmth and transparency of analog passive EQ with the precision, speed, and convenience of digital control and plugin-based automation.