Power consumption: 20 W
(idle)
130 W (typical, at maximum
volume)
Environmental
Requirements:
Temperature range: 0-40
degrees C. Relative
humidity (non-condensing):
30-85%.
Cabling Requirements:
Mixer to Speaker: Balanced
or unbalanced, shielded;
XLR or ¼” TRS connector.
Speaker to PC: Standard
9-pin, RS-232 serial cable
(male-female).
Speaker to Speaker:
Standard 9-pin, RS-232
serial cable (male-female).
Mechanicals:
Size (HxWxD): 17" x 11" x
13.5" (440mm x 280mm x
345mm)
Weight: 32lbs (14.6kg)
Disclaimer:
The features and
specifications of the Alesis
ProLinear Monitors are
subject to change at any
time without notice.
The tweeter is a 28mm silk dome that has a very flat frequency response
with a low resonance to reduce harshness. The tweeter is ferro-fluid
cooled to provide good power handling and well-behaved response.
Distortion is typically below 0.3% over its operating range. The tweeters
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 CRT.
The Cabinet
Since the 820 DSP cabinet is larger than the 720 DSP, 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.
Why Use DSP?
1. 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 with analog monitors.
The response is typically better than +/- 1dB between 100hz and 20Khz.
2. Speaker Emulation and Modeling using the Programmable EQ
There are 4 programmable, user controlled, fully parametric equalizer
bands to adjust the speaker to a desired response. The speaker has 16
stored programs (8 PRESETS and 8 pre-defined USER variable settings)
as described by the following table:
PRESET USER
1. Flat 1. Warmth
2. Hi-Fi (Smile) 2. Bass Boost
3. White Cone 3. Bass Cut
4. Faux Finnish 4. Treble Boost
5. Studio Cube 5. Treble Cut
6. Boom Box 6. AM Radio
7. BBC Dip 7. Narrow
8. 80 Hz High Pass 8. Portable Radio
Any of these settings can be varied, but only the USER settings can be
overwritten.
3. Level Adjustment
One cool feature of the Prolinear DSP is the level adjustment, which
allows the user to calibrate the input level to match other speakers.
Simply invoke it by pushing a couple of the front panel buttons and the
liquid crystal display (LCD) will display the input level into the speaker. To
calibrate the speaker, input a constant test signal (e.g. pink noise, white
noise) and adjust the rear panel pot to the desired level.
4. Connectivity
The internal processing of the ProLinear DSP provides external RS-232
serial ports that allow the user to connect the speaker to a PC or other
speaker in a daisy chain (with the included serial cables). The functions
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