ProLinear 820 Features
It Begins with the Drivers
Any great speaker design starts with the best drivers, and the Alesis' custom drivers are exceptional. The woofer has a cast frame with an 8" Kevlar-Carbon cone and oversized magnet assembly. The Kevlar-Carbon cone has an outstanding stiffness-to-weight ratio to minimize distortion, extend bass response and provide excellent transient response. The magnet assembly provides high linearity and good efficiency. In the 820 cabinet, the woofer is flat down to 39hz (-3db, anechoically) with harmonic distortion typically below .4% above 50hz.
The tweeter is a 28mm silk dome that has a very flat frequency response with a low resonance to reduce harshness. The tweeter is ferrofluid-cooled to provide good power handling and controlled response. Distortion is typically below .3% over its operating range. The tweeter's computer-designed waveguide was optimized for nearfield placement, but provides excellent imaging in most other placements.
Both drivers are shielded and allow the user to place the speakers within a few inches of a computer monitor or television.
With Alesis' custom DSP processing, the crossover for the drivers achieves a linearity that is usually unachievable in analog monitors. This allows a smooth transition of the sound between the tweeter and woofer as well as providing proper time domain coherency. In other words, the speaker is as accurate as the drivers. The DSP also allows us to smooth out the frequency response far more effectively than is normally possible with analog monitors. The response is typically better than +/- 1dB between 100hz and 20Khz.
Since the 820's cabinet is larger than the 720, heavy bracing was included to minimize any cabinet resonances. In addition, a coating of bitumen was applied to the inner walls to further deaden the cabinet. Venting was optimized to eliminate most of the vent noise, or "chuffing", that can occur at low bass frequencies.
The ProLinear is bi-amplified with typically 80 watts for the woofer and 40 watts for the tweeter. (In actuality, the woofer and tweeter are both powered at 80 watts, but because of the higher efficiency and lower power content to the tweeter, only about 40 watts is needed to match the 80 watts to the woofer.) The amplifiers are low-distortion, wide-band devices that are self-protected to prevent damage to the drivers. Inputs are either analog XLR or " TRS, so digital mixers and sources are not required. The power supply is a high-efficiency switching supply used to provide optimal power at a low weight; it is also capable of working with a wide range of AC voltages without reconfiguring the speaker. A bi-color LED on the front baffle indicates power-on when green; if the amplifier happens to clip, the LED will turn red.
Conclusion for the ProLinear 820
In keeping with the Alesis track record of providing leading-edge products at an affordable price, the ProLinear 820 gives the user a speaker that is state-of-the-art in performance with the look and feel similar to other Alesis monitors. The ProLinear series of speakers extends the Alesis line of award winning monitors, and will be a worthy addition to the best studio setups.
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