Presonus E66 Eris 6" Active MTM Series Nearfield Monitor - Used Model

Item # SRSE66QQ4
| Mfg # ERISE66
| UPC #
Our Price: $314.95
Retail: $449.95 | You Save: 30%
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Condition: This is a Customer Return and does not include the original box.  
Floor Model & Demo Model Products: Cascio Interstate Music is an Authorized Dealer, and our trained technicians inspect each item to make sure it is up to our high satisfaction levels. While this item is not in Factory new condition, we have noted any important condition notes above. If you are not completely satisfied, view our return policy (click) and simply call or email us to obtain a return authorization number and instructions.

Questions? Contact our Customer Service Department via Live Chat, at or 800.462.2263. We want you to be completely happy and guarantee your satisfaction.

Item Description:

The Eris E66 Active MTM Series Nearfield Monitor from PreSonus delivers an expanded and highly accurate frequency response and a wide stereo field. Its nested Midwoofer-Tweeter-Midwoofer (MTM) 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.

Conventional 2-way designs can cause significant early reflections from their surrounding environment. The E66 overcomes this by positioning a 1.25", silk dome high-frequency driver between two 4.5" midrange drivers. The two smaller woofers work in parallel to partially contain the dispersion of the tweeter, minimizing phase displacement. The result is detailed stereo imaging.

The E66 features two midrange drivers that cover the same frequency range. The drivers are placed so that their acoustic centers are less than one wavelength apart for any of the frequencies they reproduce. This results in the combined signal of both drivers propagating forward like a single waveform. This makes the comparatively small midrange drivers in the E66 behave like a single, larger driver. This mutual coupling provides a highly dynamic output in a compact footprint.

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 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.

The E66 utilizes 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 configuration, this works to create a transparent, cohesive sound.

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 E66 is able to perform optimally in both orientations.

This studio monitor offers acoustic tuning controls, including a three-position Acoustic Space switch that helps 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.

With three different types of audio inputs, it's easy to feed audio to your Eris monitor from a mixer, an interface, a media player, or almost any other line-level source. The E66 provides balanced XLR, balanced 1/4" TRS, and unbalanced RCA line-level inputs.


  • Frequency Response: 45 Hz to 22 kHz
  • Crossover Frequency: 2.4 kHz
  • LF Amplifier Power:   80 W
  • HF Amplifier Power:  65 W
  • SPL: Peak: 106 dB
  • LF Driver Size: 6.5" (11.43 cm)
  • HF Driver Size: 1.25" (3.17 cm) silk dome
  • Input Impedance: 10 kOhms
  • Inputs: Balanced XLR, balanced 1/4" TRS, unbalanced RCA
  • Protection: RF interference, output-current limiting, over-temperature, turn-on/off transient, subsonic filter, and external mains fuse

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Product Warranty Information

Tel: (225) 216-7887; Email:; Presonus Website; 1 year Parts and Labor

  Product warrenty information

All instruments in our catalogs and on our shopping site carry the manufacturers' warranties against defects in parts and workmanship. Should a defect occur within the manufacturer's warranty period, contact us immediately.

We will be glad to help facilitate the repair or replacement as specified by the manufacturer. The manufacturer will determine whether the defect is covered under their warranty; we do not make that determination.

Please note: U.S.-based manufacturers WILL NOT honor warranties for items sold and shipped outside the U.S. Also, if a school, school district, or board of education purchases an instrument and resells it to an individual, the manufacturer considers the warranty to be void. Warranties are extended only to the original purchaser!

All warranties, stated or implied are held with the product manufacturer and they vary from item to item. Consult the documentation that came with your product for details in addition to the information below.
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