Terra

Technical Foundation

Terra is engineered like a precision instrument, not furniture. Every component is designed to be acoustically invisible – the cabinet doesn’t resonate, the drivers don’t color, the electronics don’t add noise. What you hear is your mix, nothing else.

This generation introduces living calibration – individual driver level corrections that improve over time as our measurement capabilities and algorithms advance. Your Terra gets better as we get better.

Cabinet Engineering

Traditional monitor cabinets attempt to balance mass, stiffness, and damping – but MDF and plywood don’t excel at any of the three. Terra takes a different approach with a composite assembly: high-loss materials where damping matters, ultra-rigid structures where stiffness matters. No compromises.

Each cabinet starts as a single aluminum extrusion with 16mm solid outer walls and 9mm integral internal cross-braces – all part of the same extrusion. It takes a 9-kiloton press to form, but the result is a monocoque shell so massive and stiff that even at full output, driver back-pressure can’t induce ringing. Think of it like the difference between a wooden crate and an engine block – one flexes and vibrates, the other just doesn’t.

The side panels are Durasein – a solid surface material chosen specifically for its ATH fill percentage, which provides the ideal acoustic impedance mismatch to the aluminum shell. This prevents panel recoupling. We use A4-70 austenitic marine stainless steel fasteners with TiAlN (titanium aluminum nitride) PVD in rose gold finish, mounted on 60A silicone gaskets and torqued to spec, to maintain that impedance mismatch throughout the assembly.

The cabinet’s outer shape follows golden ratio proportions for excellent baffle step behavior, while the internal acoustic enclosures are deliberately cuboid – allowing us to target specific modal frequencies with precision metamaterial absorbers.

It’s the same philosophy as the TPCD coaxial drivers: you don’t choose between damping OR stiffness, you engineer both where each matters most.

Acoustic Control

Even a perfectly rigid cabinet has internal reflections to manage. Terra’s approach depends on the specific acoustic challenge.

Inside each coaxial chamber sits a precision-tuned microperf metamaterial absorber. It’s a rigid plate over a gradient impedance involuted gyroid bed, specifically targeting the cabinet’s axial mode frequencies. Without treatment, those modes peak at around 12dB. With the metamaterial absorbers installed, they’re unmeasurable. Think of it like noise-canceling headphones for the cabinet’s interior – instead of absorbing everything broadly, we’re targeting and eliminating specific problem frequencies with surgical precision.

We intentionally designed Terra’s enclosures as near-perfect cuboids – normally a mistake because all the modes pile up at the same frequencies. But that concentration lets us target them precisely with the metamaterial absorbers, turning a potential weakness into an advantage.

The woofer chambers use traditional fiber fill. The enclosures are small enough that primary modes sit well above the driver’s operating range, so simple damping material handles the tangential and oblique modes effectively.

Driver Technology

Terra uses two driver types, each optimized for its specific role.

The 18cm coaxial midrange/tweeter is the third generation of our signature design. Custom TPCD diaphragms with improved fiber layup, FEA-optimized hybrid motor structure bringing THD down to 0.2% power average at 90dB, and automated fiber placement pushing tweeter breakup above 40kHz. DSP limits high-frequency extension to 30kHz for optimal performance. The thin-lip underhung surround eliminates the phase cancellation that plagues most coaxial designs. The waveguide geometry loads the tweeter properly while maintaining the point-source acoustic center that gives Terra its imaging precision.

The low-frequency driver is an 18cm PuriFi PTT6.5W96-08 with custom modifications. We spec’d concave aluminum diaphragms instead of the standard convex dust caps – we don’t need the dispersion behavior in this application, so we prioritized bending stiffness for the low frequencies where this driver operates. PuriFi’s hybrid motor structure combines ceramic bulk flux with neodymium bucking sleeves to focus flux in the gap. Their unique surround geometry allows near-perfect symmetry on both sides of the stroke – think of it like a suspension that works equally well moving forward and backward. Uneven stiffness creates harmonic distortion and compression artifacts. This symmetrical design delivers extremely fast settling time and exceptional linear excursion without those distortions.

Both drivers are measured individually and linearized at the driver level before crossover application. This ensures the acoustic output matches the DSP’s expectations precisely.

Electronics & DSP

The signal path from input to acoustic output needs to be transparent. Any noise or distortion the electronics add becomes part of what you’re monitoring, which defeats the entire purpose.

Terra uses third-generation Peregrine DSP architecture with an Analog Devices ADSP-21569 SHARC+ processor and ESP32 co-processor for WiFi control. Conversion is handled by AKM’s flagship AK4493SEQ DAC and AK5572EN ADC – chosen for measured performance, not marketing specs.

Amplification is Hypex NcoreX – NCx252MP modules for the woofer and midrange, NCx-102EXT for the tweeter. These aren’t just clean and efficient; the measured sum of all harmonic distortion from the entire electronics chain sits well below the acoustic distortion of the drivers themselves. The electronics are effectively invisible – only the physical limitations of moving air set the distortion floor.

Living Calibration: Third generation of our proprietary IRC and DSP architecture now allows us to control individual driver level behavior, with discrete, perfectly phase summed corrections for each transducer independently. This means even more perfect phase tracking at crossovers, with zero interpolation necessary from sine sweep measurements – because crossovers are zero-phase and each driver is measured individually, phase tracking is perfect, not just measurement perfect.

Each Terra is individually measured and calibrated before it ships. We linearize each driver separately, then apply zero-phase crossovers at 200Hz and 2kHz. The calibration achieves ±1.5dB frequency response and ±15° phase deviation across the entire operating range (30Hz-30kHz). Because every unit is individually calibrated to the same target, any two Terras act as a matched pair.

The ESP32 co-processor provides periodic remote updates to DSP corrections as our measurement capabilities, data set, and algorithms improve. Your speakers continue to improve as we improve.

EXPANSION OPTIONS

When you need more

Larger rooms, deeper extension, film and game audio work – Gravity subwoofers are designed for when your monitoring demands go further.

Gravity extends Terra’s low-frequency response to 30Hz linear (F6 at 20Hz) via zero-phase LR4 crossover at 80Hz, and increases system SPL to 112dB @ 1kHz (106dB @ 50Hz). Powered directly from Terra’s rear panel for seamless integration. User-adjustable delay compensation and subwoofer gain trim allow placement flexibility. Can operate as integrated extension or accept discrete LFE input depending on application needs.

WiFi Control Features:

• Over-the-air firmware and calibration updates
• Multi-system sync (for ATMOS configurations)
• Channel mute, sub mute, channel solo
• Scene/configuration presets
• Delay compensation
• Equalization
• Input sensitivity control
• Boundary control
• Low latency mode