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PreSonus 2777500133 Eris 3.5-inch White Studio Monitors — main product image
PreSonus 2777500133 Eris 3.5-inch White Studio Monitors
PreSonus 2777500133 Eris 3.5-inch White Studio Monitors
PreSonus 2777500133 Eris 3.5-inch White Studio Monitors
PreSonus 2777500133 Eris 3.5-inch White Studio Monitors
PreSonus 2777500133 Eris 3.5-inch White Studio Monitors
PreSonus

PreSonus 2777500133 Eris 3.5-inch White Studio Monitors

25W50W

Compact 50W studio monitors with balanced inputs and room-tuning controls for accurate music production and critical listening.

$114.99*
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*Price sourced from Amazon.com. Last updated:Jun 20, 2026.Price and availability are subject to change.

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Overview

The PreSonus Eris 3.5 Media Reference Monitors pack studio-grade accuracy into a desktop-friendly form factor. Each pair delivers 50 watts of total Class AB amplification — 25 watts per side — through 3.5-inch woven-composite woofers and 1-inch silk-dome tweeters. The woven-composite cone design produces tight, controlled bass while the low-mass silk-dome tweeters create an ultra-wide listening sweet spot, so you get reliable stereo imaging even when you're not seated perfectly on-axis. The white finish gives these monitors a clean, modern appearance that blends well with contemporary desk setups.

Connectivity is a standout feature for monitors at this size and price point. The rear panel offers ¼-inch TRS balanced inputs for audio interfaces and professional gear alongside RCA unbalanced inputs for turntables or consumer electronics. A front-panel ⅛-inch aux input lets you quickly plug in a phone or tablet, and the adjacent headphone output with built-in amplifier means you can switch to private monitoring without rewiring anything. High- and low-frequency acoustic tuning controls on the back panel let you dial in the response to suit your room dimensions, desk reflections, and personal preference — a feature typically reserved for larger, more expensive monitors.

Key Features

HONEST. Eris 3.5 near field studio monitors deliver studio-quality, accurate sound perfect for music production, hi-fi audio listening, or multimedia reference.

EXPRESSIVE. Clear, accurate audio with a big low end — Eris 3.5's woven-composite woofers’ weave and nature result in tight bass that you can feel, as well as cleaner overall sound.

POWERFUL. Compact speakers that pack a punch — 50 Watts of Class AB dual amplification (25W per side) provide all the volume and loudness you want without sacrificing tonal balance or audio clarity.

ULTRA-WIDE LISTENING SWEET SPOT. The natural high-frequency response of the 1-inch low-mass, silk-dome transducers (tweeters) provide superior stereo imaging from nearly any listening angle.

ALL THE CONNECTIONS YOU NEED. ¼-inch TRS balanced inputs on the back panel for professional audio devices, unbalanced RCA inputs for consumer electronics, plus a convenient front-panel ⅛-inch TRS stereo aux input for your phone.

PRECISION-TUNE TO YOUR ROOM. High- and low-frequency tuning controls allow you to customize your audio output for your ears, room size, and speaker orientation. Whether on a desk, bookshelf, or next to a turntable or record player, Eris 3.5's produce clear, room-filling sound.

QUICK-SWITCH TO HEADPHONES. The easy-access front panel headphone output and built-in headphone amplifier allow for plug-and-play headphone media reference when needed.

ADD MORE LOW END & BLUETOOTH. The 50W, 8-inch companion Eris Sub 8BT studio subwoofer delivers a massive low-frequency boost and Bluetooth connectivity to your Eris 3.5’s, creating a powerful 2.1 speaker system.

POWER SAVER MODE. Power-saving mode auto engages after 40 minutes of idle time.

Specifications

Brand
PreSonus
Model
2777500133
Type
Media Reference Monitors
Color
White
Woofer Size
3.5 inches
Woofer Material
Woven Composite
Tweeter Size
1 inch
Tweeter Type
Silk-Dome
Amplification
50W total (25W per side), Class AB
Frequency Response
Up to 20 kHz
Inputs
¼-inch TRS balanced, RCA unbalanced, ⅛-inch TRS stereo aux
Headphone Output
Front-panel ⅛-inch TRS with built-in amplifier
Power Saving
Auto-engages after 40 minutes idle

Pros & Cons

👍 Pros

  • Versatile connectivity with balanced TRS, RCA, and front-panel aux input covers both pro and consumer sources.
  • High- and low-frequency tuning controls let you compensate for room acoustics and desk placement.
  • Front-panel headphone output with built-in amp allows quick private monitoring without extra gear.
  • Compact 3.5-inch form factor fits easily on crowded desks and small workstations.
  • 50W Class AB amplification delivers clear, balanced volume from a small enclosure.

👎 Cons

  • 3.5-inch woofers have limited low-end extension, so bass-heavy mixing may require an additional subwoofer.
  • Passive speaker depends on a cable connection to the active speaker, limiting placement flexibility.
  • No Bluetooth connectivity built in — wireless streaming requires the separate Eris Sub 8BT accessory.
  • Rear-panel controls are difficult to reach once the monitors are positioned against a wall or on stands.

Frequently Asked Questions

They are sold as a pair, with one active speaker and one passive speaker connected together.
The rear panel has ¼-inch TRS balanced inputs and RCA unbalanced inputs, and the front panel has a ⅛-inch TRS stereo aux input for phones or portable devices.
Yes, there is a front-panel headphone output with a built-in headphone amplifier for private listening.
Yes, high-frequency and low-frequency tuning controls on the rear panel let you customize the output for your room size and speaker placement.
Yes, a power-saving mode automatically engages after 40 minutes of idle time.

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