PreSonus Eris Series E44/E66 High Definition MTM Studio Monitors Owner’s Manual
- June 4, 2024
- PreSonus
Table of Contents
PreSonus Eris Series E44/E66 High Definition MTM Studio Monitors
Overview
Introduction
Thank you for purchasing the PreSonus Eris E44/E66 studio monitors. The E44 and E66 active monitors feature a nested MTM (mid woofer-tweeter mid woofer) design that delivers accurate response, expanded frequency range, and the widest stereo field available in their class.
We encourage you to contact us at 225-216-7887 (9 a.m. to 5 p.m. Central Time) with questions or comments regarding your PreSonus Eris E44/ E66.PreSonus Audio Electronics is committed to constant product improvement, and we value your suggestions highly. We believe the best way to achieve our goal of constant product improvements by listening to the real experts: our valued customers .We appreciate the support you have shown us through the purchase of this product and are confident that you will enjoy your Eris E44/E66!
ABOUT THIS MANUAL: We suggest that you use this manual to familiarize yourself with the features, applications, and correct connection procedures for your Eris E44/E66 before connecting it to the rest of your studio gear. This will help you avoid problems during installation and setup. Throughout this manual you will find Power User Tips that can quickly make you an Eris expert. In addition to the Power User Tips, you will find several tutorials that cover monitor placement as well as setting the Input Level, EQ, and Acoustic Space controls.
Summary of Eris E44/E66 Features Eris E44/E66
- Nested MTM design provides smooth on- and off-axis response
- Dual 4.5/6.5”Woven composite LF Drivers produce a more dynamic output than conventional designs
- 1.25”silk dome HF Driver
- Supports Horizontal and Vertical speaker placement
- LF Amplifier Power: 50W / 80W
- HF Amplifier Power: 40W / 60W
- Balanced XLR and¼”TRS, and Unbalanced RCA inputs
- Continuously Variable HF and MF Controls (-6 to +6dB)
- Low Cut Filter (Flat, 80Hz,100Hz)
- Acoustic Space settings(Flat, -2 dB, -4 dB) compensates for room placement
- RF interference, Output-current Limiting, Over- temperature, and Subsonic filter protection
- External mains fuse
- Power: 110-120V ~50/60 Hz or 220-240V ~50/60 Hz
What is in the box
In addition to this manual, yourErisE44/ E66 package contains the following:
- PreSonus Eris E44 or E66 powered studio monitor
- IEC power cable
- (6)Foam feet to be placed on the bottom of the speaker to improve isolation
Hookup
Rear Panel Connections and Controls
Inputs Line-level Inputs.TheErisE44/E66providesachoiceofthree inputs: two balanced(XLRand¼”TRS)and one unbalanced (RCA). These inputs accept a line- level signal from your audio source and feed that signal to the monitor’s built-in power amplifiers. These inputs are provided to allow for flexible connectivity and not for connecting multiple sources to your speakers simultaneously. Please connect only one source to your ErisE44/E66.
Power User Tip:
If your audio source provides balanced XLR or ¼” TRS (tip-ring-sleeve)
outputs, use one of the corresponding balanced Eris inputs, since balanced
cables are resistant to induced noise from radio-frequency or electromagnetic
interference (RFI or EMI).If the audio source has
unbalanced ¼” TS (tip-sleeve) outputs, use a ¼”-to-RCA adapter or adapter
cable. Always use the shortest cable possible to minimize the risk of induced
RFI or EMI noise.
Input Gain: Sets the level of the input signal before it is amplified.
Power IECPowerConnection: YourErisE44/E66acceptsastandard IEC power
cord.
Warning: Do not remove the center grounding prong or use a ground-lift
adapter, as this could result in electric shock.
Rear Panel Connections and Controls
Power Switch. This is the On/Off switch. The power status is indicated by
an LED on the front of the cabinet.
AC Select Switch. The input-power voltage is set at the factory to
correspond with the country in which it was shipped. Use this switch only if
you are using your Eris speakers in a country that uses a different standard
voltage than is used in the country where you purchased your Eris E44 orE66.
Acoustic Tuning Controls
- High: Boostsorcutsallfrequenciesabove10kHz by ±6 dB
- Power User Tip: The High control on the Eris E44/E66 is a high-shelf EQ and attenuates or boosts frequencies above 10 kHz. This EQ is much like the treble control on a car stereo: It raises or lowers the gain on all frequencies above the specified cutoff frequency. Shelving EQs can make big changes to the sound very quickly by adding or removing an entire range of frequencies.
Mid: Boosts or cuts frequencies around 1 kHz
by ±6 dB. The Mid control is a peak EQ that lets you boost or cute specified
frequency band(in this case, a band about two octaves wide, centered at 1
kHz). It’s capable of more subtle changes. Low Cutoff: Rolls off the level of
all frequencies below the specified frequency (80or 100Hz) at a slope of
-12dB/octave. Can be defeated by setting it to Flat, in which case, the
monitor’s natural roll off takes over. Acoustic Space: Cuts the level of all
frequencies below 800 Hz by the specified amount (-2 or -4 dB) to compensate
for the bass boost that occurs when the monitor is placed near a wall or
corner. Can be defeated by setting it to 0 dB.
Hookup Diagrams
Basic Setup
Advanced Setup
with Speaker Switching 
Tutorials
Monitor Placement
Ideally, near-field monitors should be placed so that the tweeters are at the same height as your ears when you are mixing.
ErisE44andE66speakerscanbeplacedverticallyor horizontally; when placed vertically, they should form a mirror-image pair, with the tweeters on the outside. When placed horizontally, the tweeters should be on top. 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.
Badge Rotation The logo badge on your Eris E44 and E66 can rotated to
match their orientation in your studio. Once you have positioned your monitors
in the orientation that works the best for you, simply use your fingers to
twist the logo so that it is right side up. 
Input Gain Setting
The best place to start is to set the Input Level control at its unity gain
position (labeled “U”). That means the level of the signal reaching the
amplifier is the same as the level of the signal entering the monitor’s input.
This ensures a good, strong signal level without amplifying any extraneous
noise. Make
sure that the gain controls on your audio source have been optimized for
maximum signal level and minimum noise. This process is called “gains
tagging,” and you can learn about it from many online sources. You should
always set the Input Gain on your Eris monitor so that all other level
controls in the system needn’t be turned way up or way down to achieve a
comfortable listening volume.
If setting the input gain to Unity is unsatisfactory, you can try different
settings, but remember that it’s better to avoid settings above U if possible.
If the volume is too loud at unity gain, feel free to turn the Input Gain
control down a bit—but not so far that you have to crank your audio source’s
output level to its maximum setting. If you set it too low, you’ll have to
crank your audio source’s output level way up, which will increase the audible
noise from
your source signal. If you set it too high, any noise in the signal will be
amplified, which you don’t want, either! Again, if you properly gain-stage
your audio source, setting Input Gain to U or slightly lower should work fine.
Once the monitor’s Input Gain control is set, leave it alone; don’t use it as
a system-volume control. Leave that job to your audio device’s output-level
control.
Equalizer Setting Suggestions
The Eris E44/E66 provides three EQ controls in its Acoustic Tuning section:
High, Mid, and Low Cut off.(There’s also an Acoustic Space control, which is
cove red in the next section.) In general, setting the High control to 0 (no
boost or cut)will produce the best results. However, if the sound is generally
too bright or shrill, try turning this control down below 0; if the sound is
too dull and lifeless, try turning it up above 0. It’s always better to cut
than to boost and to use the small sector boost needed to get the job done.
The Mid control is amid-frequency peak filter that boosts or cuts frequencies
centered on 1 kHz and extending about one octave above and below that
frequency. Again, setting this control to 0 will generally produce the best
results. If you want to emulate a car stereo, try turning it down below 0 to
approximate the common “smiley face” EQ curve. On the other hand, if you want
to emulate cheap portable radio, try turning it up above 0.Try not to boost
much, since this can add noise to the signal.
The Low Cutoff control rolls off the low frequencies below the specified frequency(80or100Hz).Engage this control if you are using a subwoofer in conjunction with the ErisE44/E66monitors,andsetittothesame frequency as the cross over to the subwoofer. If you’re not using a subwoofer, set the control to Flat. If you want to emulate a cheap radio, engage this control at 80 or 100 Hz while boosting the Mid control.
Power User Tip: Do not use the EQ controls on your Eris monitor to correct problems in your mix. While this changes what you hear in the control room, it has no effect on your recorded audio.
Acoustic Space Setting Suggestions
When a monitor is placed close to a wall, or in a corner, the low frequencies tend to be emphasized more than if the monitor is far from any room boundary; this effect is called“ boundary bass boost.” It is most pronounced if the monitor is in a corner and less pronounced, but present, if the monitor is near one wall.
To compensate for this bass boost, theErisE44/ E66 provides an Acoustic Space switch that cuts all frequencies below 800 Hz by a fixed amount.
If the monitors are
close to the corners of the room, start by setting the Acoustic Space switch
to -4 dB, which provides the most bass attenuation.
If the monitors are close to the back wall, try setting the Acoustic Space switch to -2 dB for less attenuation.
If the monitors are far from any wall, there will be no bass boost, so set the switch to 0 dB.
Resources
Technical Specifications
INPUTS E44 and E66)
- 1- Balanced XLR
- 1- Balanced ¼” TRS
- 1- Unbalanced RCA
PERFORMANCE
Frequency Response
- E44 55Hzto22kHz
- E66 45Hzto22kHz
Crossover Frequency
- E44 2.9 kHz
- E66 2.4 kHz
LF Amplifier Power
- E44 50W
- E66 80W
HF Amplifier Power
- E44 35W
- E66 65W
Peak SPL at 1M
- E44 103 dB
- E66 106 dB
LF Drivers
- E44 dual 4.5” Woven composite
- E66 dual 6.5” Woven composite
HF Driver
- E44 1.25”silkdome
- E66 1.25”silkdome
Input Impedance
- E44and E66 10 kΩ
USER CONTROLS
Volume Range
- E44and E66 A-type taper
MF Control
- E44and E66 Variable (-6 to +6 dB)
HF Control
- E44and E66 Variable (-6 to +6 dB)
Low Cut
- E44and E66 Flat, 80 Hz, 100 Hz
Acoustic Space
- E44and E66 Flat, -2 dB, -4 dB
PROTECTION (E44 and E66)
- RF interference
- Output-current limiting
- Over-temperature
- Turn-on/off transient
- Subsonic filter
- External mains fuse
POWER
E44and E66 100-120V ~50/60 Hz or 220-240V ~50/60 Hz
CABINET
E44and E66 Vinyl-laminated MDF
PHYSICAL
(Width/Height/Depth)
E44 7”x7”x14.3”(180mmx180mmx365mm)
E66 8.5”x 9.8”x 18.1”(215 mm x 250 mm x 460 mm)
Weight
E44 11.9 lb (5.4 kg)
E66 23.4 lb (10.6 kg)
Troubleshooting
NoPower.FirstensurethatyourErisE44/E66isplugged in. If it’s connected to a power conditioner, verify that the power conditioner is turned on and functioning.
If problem still exists, disconnect the power cable from your E44/E66 and check the fuse on the back panel of your E44/ E66. The fuse housing is located directly beneath the IEC power cable connection. A blown fuse may look black on the inside or the wire inside might appear broken. A very black fuse is a sign that something may have shorted out. Try replacing the fuse with a new one. The type of fuse needed for your monitor is listed below the power inlet. Be sure to use the correct fuse for the set input-power voltage. If the fuse blows again, you will need to contact PreSonus for a repair.
No audio. If your Eris E44/E66 appears to power on but you hear no sound when playing audio from your audio source(the lights are on but nobody’ shome),first make sure that the cable connecting your audio source to the monitor is working correctly. Also, verify that the Input Gain control is set to provide enough amplitude for the signal.
Hum. Usually, hum is caused by a ground loop. Verify that all audio equipment is connected to the same power source. If you are not using a power conditioner, we highly recommend that you add one. Not only will this help to minimize hum, it will better protect your equipment from power surges, brownouts, etc.
Use balanced cables whenever possible. If your audio device does not offer a balanced output, you can connect it to a direct box, which will provide a ground-lift switch and a balanced output.
Finally, make sure that your audio cables are not run near power cables, and use cables that are the appropriate length for your application. Using cables that are too long not only increases the risk of noise, it in creases the like LaHood that the cables are coiled, which will essentially create an antenna that picks up all kinds of audio interference.
Added bonus: PreSonus’ previously Top Secret recipe for…
Rice Dressing
Ingredients
- 1lb ground beef
- 1 lb chopped chicken liver
- 1 onion (diced)
- 2 green peppers (diced)
- 4-6celerystalks(diced)
- 2 garlic cloves (minced)
- ¼ C. chopped fresh parsley
- 3 C. chicken stock
- 6 C. cooked rice
- 1 Tbs. oil
- Salt and pepper to taste
- Cayenne pepper to taste
Cooking Instructions:
- In a large pot, heat oil on medium high and add meat, salt ,and pepper to taste. Stir until meat begins to brown.
- Lower heat and add all vegetables. Cook until onions are transparent and celery is very tender. Add stock as necessary to prevent burning.
- Stir in cooked rice. Add remaining stock and simmer on low until ready to serve.