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Audison - Thesis Th 6.5 II SAX Woofer 6.5" 150W Active Speaker Pair

  • SKU #: 02985

Special Price $2,499.99

Retail: $2,780.99

($281.00 savings)

Availability: In Stock

Condition: Brand New
Shipping: Free Shipping
Sold As: Pairs

Special Price $2,499.99

Retail: $2,780.99

Audison - Thesis Th 6.5 II SAX Woofer 6.5" 150W Active Speaker Pair

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The TH 6.5 II Sax was born from a blank sheet with the aim of overcoming all the limits dictated by compromise-oriented design choices. This philosophy allowed us to obtain extreme performance and a design projected into the future, faithful to the inspiring principle of maximum transparency of the musical message. 


The magnetic circuit uses a N48 “H-grade” Neodymium magnet that releases a very high quantity of energy and is ultra stable in temperature, ensuring an unparalleled dynamic. The geometry of the magnetic group has been optimized through a finite element simulation software to maximize efficiency by concentrating the magnetic field in the gap. A great deal of research has been carried out to reduce the modulation of the voice coil inductance by magnetically saturating the motor pole and using an aluminium short-circuit ring that also allows a greater extension towards the mid frequencies.


The development of the suspension system, a crucial element for each transducer, required a long research work: the development team created computational models to simulate every aspect of the multi-physical behavior of the loudspeaker. The spider was designed thanks to a long series of mechanical simulations performed to define its structure: a large elastic surface with 5 waves, ensuring an improved distribution of the elastic force; waves profile and gluing optimized to obtain the best symmetry in the voice coil and basket connection areas; spider composition made of a mix of two fibers to achieve the best elastic linearity, without mechanical compression effects even at high excursion levels.

Like the spider, the surround was also designed using mechanical simulations. The result is guaranteed by: use of natural rubber IIR; profile optimized to ensure wide excursion; maximization of linear elastic behavior without mechanical compression effects.


The 50 mm mobile coil in CCAR (Copper Clad Aluminum Ribbon), wound with flat wire to obtain a very compact winding, maximizes the force factor and at the same time allows for optimal heat dissipation.


The mechanical structure of the TH 6.5 II is a perfect combination of design and performance. The aluminium alloy basket incorporates all the components ensuring high precision in the various couplings. The structure featuring four pairs of spokes allows for solidity and damping of the vibrations offering very low resistance to the cone air flow. The wide spider distributes the elastic load optimally. A generously sized hole, protected by a filter cloth, prevents air compression phenomena under the spider, eliminating deleterious resonance at medium frequencies. The central opening in the bottom-plate ensures optimal decompression of the air column inside the voice coil and the output expanded material diffuses the turbulences and protects it from ingoing foreign bodies.

  1. 30,5 mm mobile voice coil in CCAR (Copper Clad Aluminum Ribbon) wound with flat wire to maximize the force factor and heat dissipation.
  2. Aluminium demodulation ring which linearizes the high excursion intermodulation distortion, canceling any sound colorations.
  3. N38 "H-grade neodymium magnet included in the voice coil to obtain superior control of the mobile crew and superior thermal stability.
  4. Motor geometry designed using finite element simulation software to optimize efficiency by concentrating the magnetic field in the gap.
  5. Membrane made of TPX®, a transparent material that reduces frequency response irregularities and provides a view of the inside of the speaker.
  6. Membrane geometry designed by simulation software to obtain homogeneous directivity.
  7. Optimized cone/surround break-up with extensive simulations to linearize the response at medium frequencies.
  8. Basket made of a single piece of die-cast aluminium with four pairs of spokes for maximum rigidity without slowing down the air flow.
  9. Suspension and spider with very high excursion, optimized with simulations of the multi-physical behavior of the speaker.
  10. eID technology for the traceability of TH 3.0 II Item from production to purchase


Technical Data

 Comp  Woofer
 Size  165 mm (6.5″)
 Power Handling  150 W Continuous Power
 300 W Peak Power
 Impedance  4 Ω
 Frequency Response  40 ÷ 4500 Hz
 Sensitivity  87 dB/Spl

 N38 “H-grade” Neodymium





 Component            Woofer
 mm (in.)   165 (6.5)
 Power Handling  W peak  300
 Impedance  Ω  4
 Frequency Response   Hz  40 ÷ 4500k
 Magnet size D x d x h     mm
  80 x 54 x 4.5
 (3.15 x 2.13 x 0.18)
 Weight of one speaker   kg (lb.)  1.25 (2.76)
 Magnet     Neodymium
 Dome/Cone     TPX

Additional Information