Audison Thesis TH 3.0 II Voce 3" 70mm Midrange Dash Door Speakers with Grills

The Audison Thesis TH 3.0 II Voce is a 3-inch (70mm) midrange driver rated at 55W continuous (110W peak), from Audison's flagship Thesis speaker range. It features a transparent TPX cone, N38 H-grade neodymium magnet and a 30.5mm flat-wire CCAR voice coil, designed for 3-way sound-quality systems.

For the matching Thesis tweeter and midbass, see the Audison Thesis TH 1.5 II violino and the Audison Thesis TH 6.5 II SAX.

Key specifications

• Size: 70mm (3 inch)
• Power: 55W continuous / 110W peak
• Impedance: 4 ohms
• Frequency response: 110Hz–5.7kHz
• Voice coil: 30.5mm copper clad aluminium ribbon (CCAR), flat wire
• Cone: TPX
• Magnet: N38 H-grade neodymium
• Sensitivity: 85.6dB

Thesis

Thesis speakers were created with the goal of delivering the pure musical output of Audison's Thesis electronics. Drawing on finite element simulation software (FEM) developed by Audison's R&D team, each driver was refined through intensive prototyping to produce the ideal transducer.

The human auditory system is most sensitive to the midrange — the frequencies that make the voice intelligible. The TH 3.0 II voce was designed from scratch around this principle, targeting extreme linearity so nothing is added to or removed from the reproduced signal.

• 30.5mm CCAR (Copper Clad Aluminium Ribbon) voice coil wound with flat wire to maximise force factor and heat dissipation.
• Aluminium demodulation ring linearises high-excursion intermodulation distortion, eliminating sound colouration.
• N38 H-grade neodymium magnet positioned inside the voice coil for superior control of the mobile assembly and thermal stability.
• Motor geometry optimised via FEM simulation to concentrate the magnetic field in the gap and improve efficiency.
• TPX® transparent cone reduces frequency response irregularities and allows a clear view of the speaker interior.
• Cone geometry designed by simulation software for homogeneous directivity.
• Cone/surround break-up optimised through extensive simulation to linearise midrange response.
• Single-piece die-cast aluminium basket with four pairs of spokes for maximum rigidity with unrestricted airflow.
• High-excursion suspension and spider, optimised using multi-physical simulation.
• eID technology for full traceability of each TH 3.0 II from production to purchase.

Ultra high control

The custom N38 H-grade neodymium magnet gives precise control of the mobile assembly. The aluminium demodulation ring cancels intermodulation distortion at peak excursions.

Extreme linearity

FEM simulation was used to optimise the cone/surround break-up point, achieving an ultra-linear midrange frequency response. The 30.5mm flat-wire CCAR voice coil provides high excursion and minimises cone non-linearity.

TPX cone

The TH 3.0 II voce membrane is made of TPX®, a transparent material that ensures frequency response linearity while leaving the speaker interior fully visible.