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Band‑Selective Current Drive

Clearer highs, controlled lows.

Almost all speakers are driven by voltage‑feedback amps—even though sound is created by current in the voice coil. Our module uses Band‑Selective Current Drive (BSCD): it keeps output impedance low at low frequencies for woofer damping, then presents high output impedance through the rest of the band to clean up distortions. It also includes a built‑in DSP with an easy desktop app for active crossover and EQ.

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Made in Canada. Targeting DIY speaker builders, boutique speaker manufacturers.

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Why this matters

Midband/HF distortion = fatigue

Non‑linear distortion blurs vocals and cymbal detail and leads to listening fatigue. A big contributor is current distortion from inductance modulation in the driver.

We control what makes sound

Electrodynamic drivers create sound from coil current (Lorentz force), not strictly coil voltage. So we improve current linearity where you hear it most.

Clarity without pricier drivers

Reducing nonlinearity with BSCD drops offensive distortions to levels you’d expect from drivers 6x more expensive. That’s a difference you can hear.

How it works in the real world

Current control where it matters

Above the LF region, the module presents high output impedance so coil current is less sensitive to the driver’s back‑EMF nonlinearity—cleaning up harmonic and intermodulation distortions that cloud detail.

Resonance stays controlled

Pure current drive removes electrical damping (Qes), lifting total Q. Our Band‑Selective Current Drive keeps low output impedance at low frequencies so the amp behaves like a voltage amp around Fs—your woofer remains well‑damped.

Set once with a simple switch

Use the Transition Frequency switch to place your driver’s Fs inside the low‑impedance region (e.g., Low • Mid • High). Choose once during setup—then forget it.

Built‑in DSP: Active XO & EQ

Active crossovers

Design flexible active crossovers in the desktop app—no passive network between amp and driver. Save and recall presets for different builds.

Powerful EQ

Shape your response with DSP‑powered EQ to fine‑tune voicing and fix room or driver quirks. Simple presets for beginners; deeper controls if you want them.

Set‑and‑forget workflow

Use the Transition Frequency switch during setup, dial your XO & EQ in software, then enjoy the clarity of Band‑Selective Current Drive.

In Short

What you’ll get

  • Hybrid current‑control Class‑D module
  • Desktop app for configuring active XO & EQ (Windows/macOS/Linux)
  • Guides, presets, and build examples

Who it’s for

  • DIY speaker builders & modders
  • Active monitor enthusiasts
  • Makers who value clarity over color

Specs

  • 2 x 120W into 4Ω
  • 2 flexible balanced analog inputs
  • I2S input and output
  • Exposes I2C, SPI, ADC, GIPOs
  • 6” L x 2.5” W x 1.75” H

FAQ

Does it include DSP for crossovers and EQ?
Yes. The module has a built‑in DSP controlled by a desktop app. Implement your active crossover and EQ in software—no passive network sits between the amp and the driver.
Does it work with passive crossovers?
For current control to be effective, the amplifier should connect directly to the driver. Use the built‑in DSP to implement your crossover and EQ actively.
Do I need to be “super technical” to use it?
The desktop app exposes friendly presets and simple controls. You can go deep if you want, but you don’t have to.

Curious how it works?

Technical appendix (optional reading)

Model the driver’s back‑EMF as including a distorting source. By keeping output impedance low at low frequencies, the amplifier preserves Qes‑linked damping around resonance. Above that region it presents high output impedance, making current less sensitive to the nonlinear source and reducing distortion products dominated by 3rd and 5th harmonics. The built‑in DSP handles active crossovers so no passive network sits between the amp and the driver.