User manual NAIM OVATOR S-600 BROCHURE

[. . . ] The leaf spring is a 200mm stainless steel bar that runs laterally underneath the cabinet and attaches centrally to its underside. At each end the leaf-spring is bolted, via tapped bosses, to the plinth. The front locations comprise stand-off bosses through which a bolt is inserted and screwed into the cabinet. A slot feature either side of each boss introduces some controlled compliance to the front cabinet locations that in combination with the leaf-spring results in the cabinet rotationally (forward and backward) decoupling from the plinth above 12Hz. [. . . ] The 50mm thick front baffle is created from the lamination of four layers of 12. 5mm MDF to create a significantly more rigid and better damped panel than would be achieved through the use of a single sheet. The outside edges of the front baffle are radiused to minimise diffracted radiation and internal bracing and strategic mass damping contribute further to a cabinet that, in acoustic terms, is fundamentally benign. The cabinet is internally lined with 20mm wool felt. The lower portion of the cabinet is divided into two separate 30 Litre closed box enclosures ­ one for each bass driver. Closed box loading was chosen thanks to the distinct advantages it offers over other loading techniques in terms of time domain performance and dynamic compression. The Ovator S-600 low frequency system resonance is at 38Hz with a Q of 0. 6. Both the Ovator S-600 bass driver and BMR chassis are custom designed high-pressure die-castings modelled using Finite Element Analysis to optimise their performance by managing the vibration energy that is an unavoidable consequence of their operation. The bass driver chassis for example is characterised by a triangulated structure that not only provides great rigidity but also maximises the open area behind the cone. Additionally, it features minimal interface mating surfaces so that mechanical energy transfer to the cabinet is controlled and predictable. Fig. 5 Speaker Cross-section 4 The Ovator S-600 Crossover A significant benefit of the of using a BMR to cover the entire mid and high frequency band is that the typical 2kHz ­ 3kHz crossover, with its unavoidable phase and dispersion discontinuities, is not required. The Ovator S600 crossover between bass drivers and BMR operates at 380Hz with fourth order acoustic slopes and minimal phase discontinuity. Thanks to the similarly wide dispersion of the bass drivers and BMR at crossover there is no dispersion discontinuity, The crossover module itself is attached to the underside of the plinth and comprises a MDF panel carrying a glass-fibre printed circuit board. It is suspended from the plinth via an elastomeric mounting system and selected crossover components also benefit from discrete mechanical decoupling. The topology of the printed circuit board borrows many of the layout and earthing principles of Naim power amplifiers. Components are all of extremely high quality, each selected following extensive technical analysis and listening. Four different types of metalised polypropylene ClarityCap capacitors are used including the new and outstanding ESA type employed as the main BMR feed capacitor. The inductors are a combination of air core and laminate steel core. The LF feed inductor is a huge laminated steel core item of 2. 8mH with only 0. 08 series resistance. The crossover filter and equalisation curves were extensively computer modelled and correlated with measurement and listening. The crossover presents a benign load to driving amplifiers with a minimum impedance of 3. 2 at 100Hz and a maximum phase shift throughout the entire audible band of ±30°. [. . . ] 6 Speaker Connectors The Ovator S-600 In Use Installing and setting-up the Ovator S-600 is simple. It is fitted when packed with a pair of castor trolleys and, with its carton upright and opened at the front, it can simply be wheeled into position. Once in position the caster trolleys can be removed and the Ovator S-600 placed on its pre-fitted floor spikes. Spike adjustment and levelling is simplified significantly by the rear spikes' top adjustment and locking access. [. . . ]