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Overture MK3

 


Overture MK3 is a third generation entry level speaker of AudioSolutions.

Overture MK3 have a marking O3** and is changing older MK2 version marked O2**;

Third series Overture introduce completely new looks compared to its predecessor.

These rather drastical visual changes marks a completely reworked speakers - a cabinet, drivers and crossover structure.

We proudly present Overture – the ultimate marriage of art and technology.

The cabinet. Overture MK2 where equipped with self-locking cabinet structure which was a major breakthrough back then compared to typical non-complex cabinet structure.

Working with huge potential of self-locking cabinet we came up with other cabinet type – Box- in-a-Box structure.

 

This type of cabinet is being used in our award winning Virtuoso speakers and is remarkably stiff yet shares extremely good dampening properties.

Seeing its flexibility to work with and potential of Box-in-a-Box cabinets in general, we decided to adapt this expensive technology to our cheaper entry level products. Overture MK3 shares Virtuoso cabinet technology and is equipped with Sectional-Box-in-a-Box cabinet system. Whole cabinet consists of two intersecting cabinets – lightweight inner box and heavy outer box.

The polyurethane layer in between the two boxes acts as dampening material. Thin but stiff inner cabinet provides necessary support for structure itself as well as transfers energy of radiated back-wave to outer cabinet layers without storing energy inside material and preventing the back-wave being reflected to the listener.

Fast energy transfer is essential in order to prevent low Q oscillations which can last relatively long and ruin precise sound reproduction. To illustrate low Q oscillations think of the swings where energy is stored for prolonged period and oscillations dies slowly due to high mass and lack of dampening. With just one push you will have prolonged oscillations which are unwanted in the cabinets.

So, transferred from inner box, energy reaches outer box which has huge mass to absorb the received energy (compared to inner cabinet) and have low inner tension forces and thus high dampening properties to dissipate energy in to heat as fast as possible without generating unwanted prolonged oscillations.

However, these two layers alone cannot provide efficient energy exchange and dissipation in to heat. That’s why third layer in between outer and inner boxes is so essential – a polyurethane layer joins two cabinets (which are separated by fraction of millimeter) and provides additional dampening due to high viscosity. This layer not only acts as additional barrier for energy to be dissipated in to heat while traveling from inner box to outer box, but also helps outer high mass box to quickly stop its movement.

To illustrate its working principle we can imagine a swings being suddenly stopped with a help of soft pillow. The drivers. Overture MK3 equips heavily upgraded drivers. After seeing how potent and successful Figaro drivers are we decided to use similar materials Figaro-based drivers in our new Overture MK3. Now both of speakers share the same ER cones giving incredible performance. Magnetic system and dampening rings was reworked to suit Overture MK3 as well as high power voice coils where added compared to its predecessor.

 

High frequencies are being reproduced by lightweight silk dome tweeter which is upgraded version of MK2 tweeter. With this reworked driver we were able to use more selective and more efficient mini-horn system. New mini –horn system is a bit deeper and a bit wider.

Calculated to cover bandwidth where soft dome should start to flex and preventing it from happening, especially when driven hard. Furthermore new Mini-Horn time aligns drivers better. Mini – Horn. all our speaker series are equipped with Mini Horn loading. This is special treatment for soft dome tweeters. Soft dome tweeters are known to have high distortions when driven loud. Distortions rise exponentially because center part of dome stops moving at certain levels and frequencies thus flexes uncontrolled by suspension.

This is due to soft dome nature. Some manufacturers use an ark over tweeter’s dome with dampening material touching center of dome to dampen this unwanted flex. Problem with such system occurs at different listening levels. It is simply not linear because force which center of dome is rammed by dampening material is fixed and doesn’t change with tweeter’ excursion. Others uses stiffening materials like titanium bracing glued to dome i.e.

This solution is far better, however, it is not without a flaws as well. Yes it stiffens the structure, but adds mass to it and thus inertia of dome spoiling impulse characteristics and sensitivity. Also this is quite expensive to manufacture with low tolerances so that electrical and acoustical parameters wouldn’t differ between samples.

Our Mini Horn on the other hand is much more efficient to manufacture and repeat the process with low tolerances. Mini-Horn is based on acoustical dampening just as it is in usual horns. We carefully measure at which frequencies tweeter starts to flex and emit avalanche of distortions. Mini Horn is calculated and manufactured according to desired specifications to dampen those frequencies.

 

The result is proportional dampening of the tweeters’ movement. The louder it plays the more dampening it gets from its own emitted sound. It is described as acoustical impedance and is highly dependent on mini-horn shape. Another aspect is that Mini Horn adds sensitivity (because - horn) rather than lowering sensitivity (because restricting movement) like in previous examples.

Features.


Overture MK3 comes with carpet-piercing spikes for stability and improved performance. In the set you will also find protective caps for spikes if you want to place speaker on hardwood floors. Spikes are threaded with M6, this standard allows customer to experiment with other type of spikes or dampening feet to his taste.

We upgraded binding posts to massive metal ones finished in nice frosted satin silver. These binding posts can take any high-end cable manufactured today with any terminations and provide proper grip for tightening.

Overture MK3 is being offered in two standard colors Gloss Black and Gloss White.

 

At extra options we offer three woods – Oak, Mahogany and Wenge.

Technical specifications. Overture O304F

Dimensions (HxWxD) : 990mm x 210mm (357mm with feet) x 330mm; 39 x 8.3 (14) x 13 in

Weight : 27 kg/59 lbs each

Shipping weight : 34 kg/75 lbs each

Sensitivity : 90 dB @ 2.83V 1m

Nominal power handling : 120 W rms

Maximum unclipped power handling : 240 W;

Impedance : 4,0 ohms

Crossover frequency : 500 Hz; 3000 Hz

Frequency response (in-room environment) : 37-26000 Hz

Drivers : 2,5 cm silk dome tweeter, 15.2 cm ER paper cone mid, two 15.2 cm ER paper cone mid-bass drivers

https://www.chameleonracks.gr/Audio%20Solutions%20speakers/Audio-Solutions-Overture-O305F-en

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