Design Ideologies
Many have said the Thesis range of speakers sound head and shoulders above the competition. This search for the best acoustic result started by overcoming the intrinsic limits of traditional loudspeakers. Through a finite element simulation software (FEM) conceived by the Audison engineering team a mathematical model was developed to create the ideal transducer. With the Thesis speakers the team reached a significant revolution; producing a speaker system that can reveal every minute detail and nuance from your high-end amplifier.
Design Features
When listening to the beautiful tones of the Thesis speakers you can tell immediate there is some unique and groundbreaking about them. Their clarity, their cleanliness, their superb response. Just everything about them is brilliant. Without further ado let’s have a look at what goes into them shall we?
The Larger Siblings
Let’s turn our attention to the larger siblings within the Thesis stable; the cones. For these are the real musical powerhouses that produce the delectable middle and low tonality that must be heard to be believed.
Building The Foundation – The Thesis Sax Midbass
Remember above we said the dogma of the Thesis component sets was overcoming all the limits dictated by compromise-oriented design choices. This philosophy allowed Audison to obtain extreme performance from the TH 6.5 II Sax midbass driver, affording it the ability to capture every detail of the musical message with maximum transparency.
One ambitious goal for the larger driver, mainly because it can play quite high as a midrange too; is producing a frequency response as smooth as possible in all listening positions on or off axis. It it designed to distribute acoustic energy over a wide azimuth without any distortion in the frequency response. This allows the TH 6.5 II to play optimally when mounted in a door facing sideways; a situation where it’s not aligned with the listener.
Attractive Poling – The Magnet
Both the TH 3.0 II and TH 6.5 II feature N38 and N48 H-grade neodymium magnets. These magnets release a phenomenally high quantity of energy and are ultra stable in high temperature environments, thus ensuring an unparalleled dynamic. The geometry of the magnetic group has been optimized through 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 allows a greater extension when playing towards the midrange frequencies.
Reciprocating With accuracy – The Suspension
The development of the suspension system is a crucial element for every transducer, and these were no different. Requiring a lot of research work, the development team created computational models to simulate every aspect of the multi-physical behaviour of the loudspeaker. The spiders were designed thanks to a long series of mechanical simulations performed to define its structure. A large elastic surface with five waves ensured an improved distribution of the elastic force. The waves’ profile and gluing are optimised to obtain the best symmetry in the voice coil and basket connection areas. The spider composition is a mix of two fibre to achieve the best elastic linearity and 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 through a maximisation of linear elastic behaviour without mechanical compression effects.
Rigid Holdings – The Basket
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 as well as offering very low resistance to the cone air flow. The wide spider distributes the elastic load optimally. A generously sized venting hole is protected by a filter cloth and prevents air compression phenomena under the spider. This eliminates 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 vortex splitters diffuse the turbulences.
Impressive Transparency – The Cone
During the design of the cone the engineering team selected TPX® thermoplastic polymer due to it’s excellent acoustic and mechanical features. More specifically, its low density and its high mechanical damping contribute to produce an exceptionally smooth frequency response in all possible listening positions. Being transparent, it leaves the precious Thesis diamond logo machined from a solid block of aluminium in full view. TPX® is injection moulded, a technique that has made it possible to create a variable thickness profile thus giving the structure even more rigidity.
Taking advantage of innovative finite element calculation methods that allow the simulation of the speaker overall vibro-acoustic performance, Audison designed a monolithic cone, which simply means it’s of one block including diaphragm and dust cap. This resulted in an extremely rigid structure with a single gluing point with the voice coil. This particular structure allows the cone vibration modes to be moved. A cone vibration mode is a frequency in which the cone is deformed introducing irregularities in the frequency response. These modes were shifted as much as possible towards the high frequency range, leaving the entire mid-frequency band free from any irregularities. This this provides the speaker with an extremely transparent and detailed voice in the mid-range and a stallion like kick in the lower frequency range.
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