Active Two-Way Speaker: The PreSonus Eris E4.5 powered studio monitor
speaker sports a 4.5" Kevlar low-frequency driver and 1" silk-dome tweeter powered by a
25W Class-AB amplifier. It
can crank out a clean 100 dB SPL, peak. Frequency response is rated at 70 Hz to
Bass Reflex Enclosure: The E4.5 powered studio monitor speaker has a
rear-ported enclosure made of vinyl-laminated, medium-density fiberboard (MDF).
Signal Inputs: The E4.5 has balanced 1/4" TRS and unbalanced
RCA inputs, as well as unbalanced 1/8" inputs for your smartphone or MP3 player,
giving you all the flexibility you need for system hookup. Spring clips
terminals are used to connect the E4.5 active and passive speaker together with
the included 6.5' length of speaker wire.
Controls: A combination of controls lets you create a linear
response for accurate monitoring and enables you to simulate different listening
environments, so you don't have to listen to mixes on your car, consumer
computer speakers, and home stereo to check how the music sounds with different
systems. Instead, you can adjust the Eris E4.5 studio monitor response and test
your mixes without leaving your studio.
- Input Gain: The Input Gain sets the level of the
speaker's input signal from your connected source before it is amplified.
- Acoustic Tuning EQ: The Eris E4.5 provides three EQ
controls in its Acoustic Tuning section; High, Mid, and Low Cutoff. These
controls enable you to fine-tune the monitors and even to broadly
approximate the sounds of different types of speakers so you can hear what
your mix might sound like.
- High: boosts or cuts all frequencies above 10 kHz
by ±6 dB
- Mid: the Mid control is a peak EQ that lets you
boost or cut a specified frequency band; in this case, a band about two
octaves wide, centered at 1 kHz
- Low: rolls off the level of all frequencies below
the specified frequency (80 or 100 Hz) at a slope of -12 dB/octave
- Acoustic Space Switch: In addition to the Acoustic
Tuning controls, the Eris speaker offers a three-position Acoustic Space
switch. This switch controls a second-order, low shelving filter that cuts
the level of all frequencies below 800 Hz by a specified amount (-2 or -4
dB) to compensate for the boundary bass boost that occurs when the monitor
is placed near a wall or corner. If you don't want to roll off those lows,
set it to 0 dB.
Protection Circuitry: Any loudspeaker is subject to an assortment of
environmental and performance problems, and the Eris monitor offers protection
from the most common of these factors.
- RF Shielding: RF shielding protects against radio frequencies
that could be induced into the signal and become audible.
- Thermal Protection: The Eris monitor also provides
over-temperature protection to avoid heat-related issues.
- Short Circuit: Current-output limiting prevents damage should
there be a short circuit on the speaker terminals.
- Subsonic Filter: Subsonic protection is used to filter out
extremely low-frequency vibrations that could interfere with the woofer's
- Soft Start Up: The integrated power amplifiers have a "soft
startup" so that you don't get damaging pops in the speakers when you power
Placement: Ideally, near-field monitors should be placed so that the
tweeters are at the same height as your ears when you are mixing. The Eris E4.5
speaker can be placed vertically or horizontally; when placed horizontally, two
E4.5 speakers should form a mirror image pair, with the tweeters on the outside.
The speakers should be separated so that the tweeters form an equilateral
triangle with your head. The monitors should be "toed-in" or angled, so that
they are pointed at you, not pointed straight ahead.
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