PreSonus AIR 12 Active Loudspeaker
The best of two worlds.
Each type of power amplifier has advantages and disadvantages. By employing different amplifier types for each driver, AIR12 loudspeakers use the respective strengths of Class D and Class A/B amplifiers to provide optimal response throughout the speaker’s frequency range. A 500W (continuous), Class D amplifier powers the 12-inch low-frequency driver, providing efficient, clean power for gut-shaking low end when you need it. A 200W (continuous), Class AB amplifier powers the 1.35-inch high-frequency driver, delivering a natural sounding, "AIR-y" high end. The combination can deliver up to 123 dB SPL of sweet, clear sound between 51 Hz and 20 kHz.
Impulse Response, or IR, is the basis for digitally tuning any loudspeaker system. IR involves managing phase coherence with digital Infinite Impulse Response (IIR) filters, along with symmetrical and asymmetrical crossover filters. In designing the AIR-series professional loudspeakers, PreSonus made specific choices that make tuning (voicing) and coherence easier and more natural sounding. In most modern powered loudspeaker systems, Class D digital switch-mode amplifiers are used for all transducers. Class D amplifiers have many benefits. However, if the switching frequency of a Class D amp is not sufficiently high enough, or it’s not properly filtered, high-frequency response can sound grainy, and transients appear to be slewed with a time smear in an impulse response analysis.
To address this, PreSonus designed AIR loudspeakers utilizing a Class A/B amplifier for the high-frequency transducer and a Class D amplifier for the low-frequency transducer. The Class A/B amplifier used in PreSonus AIR loudspeakers is pure analog, with the “always on” driving characteristic of Class A/B amplifier topology. Therefore, the impulse response filtering necessary to tune an AIR loudspeaker is simplified and has less effect on the natural sound of a well-designed cone driver combined with a compression driver.
To describe the design, the engineering staff at PreSonus invented the term “Advanced Impulse Response” (AIR). The term represents the “airy” sound of the high-frequency components, as well as the simplified IR filters needed to voice the loudspeaker system.