Caratteristiche principali
The Alesis ProLinear 820
continues the new standard in near-field monitors set by the
ProLinear 720DSP and 820DSP, but at a lower price than the 820DSP.
With Alesis� custom DSP technology, we have designed a speaker with
same sound quality and accuracy as the 820DSP, with the extended
bass and greater output over the 720 speakers. This allows the
speaker to be used as a mid-field monitor as well as near-field.
Clarity, imaging and transient response are truly outstanding. Bass
is tight and visceral. The primary difference between the 820 and
820 DSP is the absence of the 4-band parametric EQ control present
on the 820 DSP. The 820 has fixed internal crossover and EQ settings
that yield the flattest, and most accurate response.
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.
The Crossover
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.
The Cabinet
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 Electronics
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.
Input
-
Nominal input level: +4dBu
(-15dBFS)
-
Maximum input level: +20dBu
(7.0 Vrms)
-
Input impedance: 10kohms
Output
-
Sound Pressure Level (SPL):
113db at 1 meter at max input below clipping
-
Low Frequency (LF) power: 80
watts RMS, -120 watts peak
-
High Frequency (HF) power: 40
watts RMS typical, -120 watts peak
-
Frequency response: 50hz è
20kHz +/- 1.5dB. Bass level -3dB @ 39hz typical
-
Signal To Noise ratio: > 90 dB
A-weighted, Analog In to Analog Out
Power Requirements
-
Input voltage: 100v è 230v
-
Input frequency: 47 è 63 Hz
-
Power consumption: 20 W (idle)
130 W (typical, at maximum volume)
Cabling Requirements
-
Mixer to Speaker: Balanced or
unbalanced, shielded; XLR or 1/4� TRS connector
Mechanicals
-
Size (HxWxD): 17" x 11" x 13.5"
(440mm x 280mm x 3405mm)
-
Weight: 32lbs (14.6kg)
|
 N.B.: Il prezzo è
inteso per la cassa singola!!! |
