With the Prima speaker range, different solutions have been introduced to simplify, to the maximum extent, OEM Integration and achieve a result capable of satisfying the Audison quality criteria. The electro-acoustic designers focused their attention on those drivers dedicated in reproducing the whole audio range the coaxial, as these are those most critical in reconstructing the sound stage and so in recreating the "live" effect in a Car Audio system. By using advanced technologies such as Finite Element Method (FEM) modelling, as well as a prolonged "Voicing" phase, consisting of in-car listening sessions, it has been decided to adopt a concentric tweeter within the woofer, providing one single point of emission. This typology of speaker ensures that the musical signal is reproduced with high linearity of acoustic phase; therefore the listener perceives it as being disarmingly natural. In order to control dispersion of the high frequency range, the concentric tweeter features an acoustic lens specifically designed to ensure an extremely linear frequency response when installed in the door, thus entirely off-axis. The combination of such build choices offer the possibility to achieve performance and sound quality comparable to a two-way system for those vehicles prohibiting this type of speaker installation. On top of this, a believable acoustic sound stage is projected towards the listener. The concentric tweeter also provides the ability to mount the speakers in extreme locations. As an example, in installations where the tweeter of a typical coaxial driver protrudes and may come in contact with the OEM door panel/grille, the Prima line makes the installation simple and reliable. It was during the aforementioned "Voicing" phase that the Audison designers decided to employ a 32 mm pure copper voice coil for the coax woofers; an unusual choice from a technical and cost standpoint for this market range where most competitive product employs a 25 mm coil. The reasons behind that choice can be found in the will to respect the two main goals of this project: high power handling and maximum efficiency. In fact, combined with an amplifier, the 32mm coil ensures musical reproduction void of compression, especially during musical peaks where the motor assembly has to withstand mechanical and thermal stress. The efficiency has been maximised by eliminating low pass crossover components for the woofer: even just a simple filter inductor in series with the woofer, due to the resistance of its winding, introduces a loss which in turn lowers efficiency and sound pressure level. By not employing any type of filter, our designers had to optimize the cone profile in each model using the Klippel R&D Scan Vibrometer to obtain a calibrated "mechanical" low-pass cut-off frequency, therefore achieving a frequency response close to that of a filtered woofer! The result of this exhausting work of research gave life to a series of speakers capable of handling noticeable power combined with high efficiency and a balanced timbre.
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A powerful drive circuit is necessary to amplify sound signals from a control amplifier with high fidelity and to exploit the performance of various speakers. M-700u has achieved the output of up to 840 W + 840 W (1Ω) instantaneously from the rated output of 120 W + 120 W (8Ω) and 210 W + 210 W (4Ω). Speakers can be driven with its sufficient power under any load conditions. Moreover, the BLT mode allows the user to use the unit as a monaural amplifier with the rated output of 420 W(8Ω). A 4-parallel push-pull structure with 3-stage Darlington is used in this circuit to acquire such high power. The latest version, ODNF 4.0 circuit, that has achieved primary slew rate speed indicating the startup performance by feeding back only distortion components, ultra-wide bandwidth, and low level of distortion is adopted for the amplifier circuit, which is inherited from M-900u, our top-end model. Precise reproduction of a small sound signal has enhanced the elaborate sound expression and the expressive capability of tranquillity. Setting up to 6 W with which sound range can be practically and sufficiently acquired to the Class A operation range, it has made its high power consistent with sound expression of high density.* ODNF is an abbreviation for "Only Distortion Negative Feedback". 2ff7e9595c
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