Smooth and WideEris E66: MTM design delivers the widest sweet spot in its class.
Ultra-wide, detailed stereo soundstage.The Eris® E66 delivers an expanded and highly accurate frequency response and the widest stereo field available in its class. Its nested Midwoofer-Tweeter-Midwoofer (MTM, also known as “D’Appolito”) configuration offers improved off-axis response and spatial resolution. The result is a more consistent listening experience, smoother frequency response, and an ultra-wide, detailed stereo soundstage.
Consistent listening.Sound waves radiating from the two components in a conventional speaker design can interfere with one another, creating peaks at some frequencies and dips at others, and these will vary depending on where the listener is relative to the speaker. In an MTM/D’Appolito configuration, component interference and the sonic inconsistencies that go with it are minimized. This affords listeners an ultra-wide sweet spot and a more consistent listening experience on- and off-axis.
Transparent and cohesive sound.The E66 utilizes a pair of 6.5-inch, custom-woven, Kevlar® low-frequency drivers. This provides a more constant dispersion pattern throughout the frequency range, resulting in less time-smeared audio and cleaner overall sound. The weave and nature of the dual Kevlar woofers also helps break up reflected energy, so fewer delayed reflections reach the listener’s ear. In conjunction with the MTM/D’Appolito configuration, this helps create a transparent, cohesive sound.
Horizontal or vertical—it’s up to you.Many MTM configurations must be arrayed vertically, rather than horizontally, because vertical placement provides a clear, interference-free midrange and treble reproduction to either side, expanding the sweet spot. By bringing the midrange drivers closer together and raising the high-frequency driver, the E44 and E66 are able to perform optimally in both orientations. So, like all Eris speakers, the E44 and E66 let you position your speaker the way that works best for you.
You’re in control.Today’s music producers deal with a wide variety of musical genres and often work in more than one location. That’s why Eris-series studio monitors offer extensive acoustic tuning controls. The three-position Acoustic Space switch helps to compensate for the boundary bass boost that can occur when a monitor is placed in a corner or near a wall. High and Mid controls help to further mitigate room anomalies. A Low Cutoff filter makes it easy to integrate a Temblor® subwoofer into your monitor setup.
Accuracy defined.Like all PreSonus® studio monitors, the Eris E66 offers consistent, accurate listening and extensive user controls. The ultra-wide stereo image afforded by its MTM/D’Appolito design makes it an ideal solution for anyone who requires best-in-class spatial resolution. Hear it at your favorite PreSonus dealer.
Features
Components and construction
Dual 6.5-inch, custom-woven Kevlar® LF/midrange drivers produce dynamic, size-defying bass output
1.25-inch, silk-dome HF driver ensures smooth high-frequency performance that is never fatiguing to the ears
Balanced XLR, balanced ¼-inch TRS, and unbalanced RCA inputs provide flexibility for seamless integration into any environment
User controls
Acoustic tuning controls help to compensate for room anomalies, providing a consistent frequency response customized for your mix environment
Continuously variable HF and MF controls (-6 to +6 dB)
Low-cut filter (flat, 80 Hz, 100 Hz)
Acoustic Space settings (Flat, -2 dB, -4 dB) compensates for room placement
Power and safety
90W/140W Class A/B bi-amplification for an open, clear sound
RF interference, output-current limiting, over-temperature, and subsonic filter protection
Amplifier “soft start” feature eliminates popping on power-up
Internal power supply with IEC connector

ROLAND UMONEMKII USB MIDI INTERFACE
MXR M234 ANALOG CHORUS
STAGG FRENCH HORN STOP MUTE
ERNIE BALL EARTHWOOD EXTRA LIGHT 10-50
ERNIE BALL 5-STRING SUPER SLINKY 40-125
IBANEZ GA5TCE CLASSICAL GUITAR W/ PICK-UP
MEINL NINOADJ4S WOOD DJEMBE
PROTECTION RACKET 9017 PERCUSSION BAG
DADDARIO ACCESSORIES 25LB04 BEATLES STRAP
EVANS 20 EQ3 BATTER CLEAR BASSDRUM HEAD
EVANS 20 EQ4 BATTER CLEAR
EVANS 10 ONYX 2-PLY COATED
EVANS EC2S FROSTED 18 IN.
EVANS EC2 COATED 13 INCH
DADDARIO ECG24 CHROMES
YAMAHA HW680 HARDWARE SET
KLOTZ USB CABLE A-PLUG/A-PLUG 1M
YAMAHA YAH 203 ALTO HORN
ERNIE BALL POWER SLINKY 11-48
DADDARIO ACCESSORIES 50AL01 ALCHEMY GUITAR STRAP MUTED SKULLS
ERNIE BALL BEEFY SLINKY 11-54
YAMAHA POLISHING CLOTH YELLOW (S)
KLOTZ ASMM0150 STEREO-CABLE 1,5m.
YAMAHA A1RIIVN ELECTRIC ACOUSTIC GUITAR VINTAGE NATURAL
ROCKBOARD DUO 2.2 PEDALBOARD WITH GIG BAG
YAMAHA YSV-104 RED SILENT VIOLIN
TAYLOR K24CE KOA
K&M 21367 DISTANCE ROD RING LOCK BLACK
YAMAHA STAGE CUSTOM BIRCH 2F5 RAVEN BLACK
DADDARIO ACCESSORIES AUTO-TRIM 3+3 PWAT332L
GIBRALTAR GCS-LSP CONGA STAND
YAMAHA YTR 8345S CUSTOM Bb TRUMPET SILVER PLATED
YAMAHA U1 TA3 TRANSACOUSTIC SILENT PIANO POLISHED EBONY
AKG K240 STUDIO
ERNIE BALL SUPER SLINKY BASS 45-100
YAMAHA GL1 GUITALELE
YAMAHA YBL 620GE Bb/F/Es(D) PROFESSIONAL BASS TROMBONE
TAYLOR 214CE KOA DELUXE
MOOER BLACK SECRET DISTORTION MDS1
VIC FIRTH 2BN AMERICAN CLASSIC NYLON TIP
PROTECTION RACKET 1618 BASS DRUM CASE
PEARL EXPORT EXX705C STUDIO DRUMSET JET BLACK
VIC FIRTH VKB2 WOODEN CAJON BEATER
MEINL NINO EGG SHAKER VARIOUS COLOURS
EVANS EC1 COATED 12 INCH
GIBSON LES PAUL STANDARD '50S TOBACCO BURST
YAMAHA P121M PE POLISHED EBONY 121CM
SENNHEISER XSW 1-835
PROTECTION RACKET 9113 DJEMBE BAG
KLOTZ M1 MIC CABLE 1M FEMALE XLR-JACK
LEVANTE LV-SB5105 BASS SAXOPHONE WITH LIGHT CASE
KLOTZ M1 MIC CABLE 3M FEMALE XLR-JACK
YAMAHA YFL-282 FLUTE
YAMAHA CX40III CLASSICAL GUITAR NATURAL WITH PIEZO
VIC FIRTH F1 WOOD TIP
GIBRALTAR 7615 PERCUSSION TABLE
LP GIOVANNI PALLADIUM 11 3/4 CONGA
PEARL PC110P CONGA STAND PRIMERO 11-INCH
IBANEZ GRG 140 HSS SUNBURST
MEINL MTB TIMBALE BAG
HOHNER BRAVO III 96 RED SILENT KEY
PRESONUS AIR XD 10 ACTIVE LOUDSPEAKER
K&M 23550 MIC.BAR Black
AHEAD STICK TIP TIP
HARDCASE 24"BASSDRUM CASE
SHURE SM7B DYNAMIC STUDIO VOCAL MICROPHONE
STAGG STANDARD CRATE CAJON SUNBURST
STAGG PROFESSIONAL 10 X 10 TOM BAG
KLOTZ SC3 SUPERIOR SPEAKER CABLE 2 X 2,5 5M
MEINL TMCCH PROFESSIONAL CONGA STAND
MEINL MCJB CAJON BAG
MEINL NINO564 WOOD SHAKER
PROTECTION RACKET 6016 TOM CASE
TASCAM DR-07X STEREO HANDHELD AUDIO RECORDER
MEINL NINO569R EGG MARACAS
PEARL P830 DRUM PEDAL
YAMAHA TRBX 174EW NATURAL
EVANS 22 GENERA G1 COATED
BOSS BD2 BLUES DRIVER
FENDER PURE VINTAGE 14" SMALL TILT BACK LEGS
FENDER VENICE SOPRANO UKULELE NATURAL
K&M 152/10 TRUMPET STAND BLACK
YAMAHA B3E PWH UPRIGHT PIANO POLISHED WHITE 121CM
PROTECTION RACKET 3010CS SNARE CASE
PEARL RS585C/C ROADSHOW DRUMSET JET BLACK
KLOTZ M1 MIC CABLE 1M MALE XLR-JACK
REMO 14POWERSTROKE 4 COATED
LEVANTE LV-BH5411 Bb BARITONE SILVER-PLATED GOLD TRIM
EVANS 12 J1 ETCHED
GIBRALTAR 6 IN. WHITE PORT HOLE RINGS
MEINL HE3030 ALUMINIUM DOUMBEK EGYPT
GIBSON LES PAUL STANDARD '50S P-90 TOBACCO BURST
YAMAHA SE122 PE
VIC FIRTH AJ3 AMERICAN JAZZ
K&M TABLET PC HOLDER BIOBASED BLACK
AKG WMS40 MINI INSTRUMENT SET ISM1
TAYLOR 814CE
DUNLOP BODYGLOSS 65 CREAM OF CARNAUBA
MEINL CAJON RING CASTANET
DADDARIO ACCESSORIES CUSTOM SERIES 20FT CABLE
EVANS 16 ONYX 2-PLY COATED
MEINL NINO570 TONE-BLOCK
MXR M107 PHASE 100
STAGG PP52 BASS PEDAL
EVANS 10 GENERA G2 COATED TOM HEAD
YAMAHA YTR 2330 Bb STUDENT TROMPET + SOFT BAG
VIC FIRTH AJ2 AMERICAN JAZZ
REMO 20EMPEROR CLEAR
HOHNER MARINE BAND 1896 C-HARMONIC MINOR
YAMAHA HS8 ACTIVE STUDIO MONITOR WHITE 