PreSonus
PreSonus AUS-E45-BT Bluetooth Studio Monitor Bundle
★★★★★
50W25WBluetooth 5.0XLR
Bluetooth-equipped near-field monitors that bring honest, flat-response tracking to desks where cable management matters.
$189.99*
Check availability
*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.
Notice a mistake? Let Us Know
Overview
Key Features
Compact size with studio-quality sound: 4.5-inch woven-composite woofer and 1-inch (25 mm), ultra-low-mass, silk-dome, high-frequency transducer
50W (25W/side) Class AB amplification, integrated headphone amplifier with front-panel stereo 1/8-inch jack
RCA and 1/4-inch balanced TRS plus 1/8-inch stereo Aux In for use with mobile audio devices
Bluetooth 5.0 wireless stereo input
Bundle includes (2) PreSonus Eris E4.5 BT 4.5" Active Media Reference Monitors with Bluetooth, Gearlux XLR Cables, Isolation Pads, 1/4" TRS Cables, and Austin Bazaar Polishing Cloth
Specifications
Woofer
4.5-inch woven-composite
Tweeter
1-inch (25mm) ultra-low-mass silk-dome
Amplification
50W Class AB (25W per side)
Bluetooth
Bluetooth 5.0
Inputs
RCA, 1/4-inch balanced TRS, 1/8-inch stereo Aux In
Headphone Output
Front-panel 1/8-inch stereo jack with integrated amp
Bundle Includes
(2) Eris E4.5 BT monitors, Gearlux XLR cables, isolation pads, 1/4" TRS cables, polishing cloth
Pros & Cons
👍 Pros
- Woven-composite 4.5" woofer delivers tighter, more controlled low-mids than paper-cone drivers common at this price point
- Bluetooth 5.0 input adds genuine workflow flexibility for reference listening from mobile devices without cable swapping
- Balanced 1/4-inch TRS inputs maintain signal integrity over longer runs and reject common-mode interference from studio power supplies
- Front-panel headphone amplifier eliminates the need for a separate headphone amp in a basic monitoring chain
- Class AB amplification provides clean, warm headroom at near-field SPLs without the sterile edge of cheaper Class D designs
👎 Cons
- 4.5-inch woofer lacks meaningful output below approximately 80Hz — low-end mixing decisions require headphones or subwoofer supplementation
- 50W total (25W per side) limits usable SPL in rooms larger than a small home studio or bedroom setup
- Bluetooth input introduces latency that disqualifies it from real-time tracking or live monitoring workflows
- RCA inputs are unbalanced, making the monitors susceptible to ground hum in electrically noisy environments when used on that input
- No front-panel level trim or acoustic tuning controls (high/low shelf filters) that competing monitors in this range sometimes include
Frequently Asked Questions
How accurate is the frequency response on the Eris E4.5 BT for critical mixing decisions?
The 4.5-inch woven-composite woofer and 1-inch silk-dome tweeter are tuned for reference-flat response — the Eris line is designed to reveal mix problems rather than flatter them. At this driver size, low-frequency extension rolls off meaningfully below 80Hz, so for critical low-end decisions on bass and kick drum, you'll want to cross-reference with headphones or a subwoofer. For mid-range clarity, vocal placement, and high-frequency detail, the E4.5 BT performs accurately at its price tier.
Does the Bluetooth 5.0 input introduce latency that affects real-time monitoring or DAW playback?
For real-time monitoring while tracking — recording a vocal or instrument while listening back — Bluetooth latency (typically 100–200ms on aptX, more on SBC) makes it unsuitable. For DAW playback review, podcast editing, reference listening, and casual streaming, the Bluetooth input is clean and low-noise. Use the balanced TRS or RCA inputs for any latency-sensitive session work.
What does Class AB amplification mean for the sound character of these monitors?
Class AB amplification sits between the efficiency of Class D and the warmth of pure Class A. In the Eris E4.5 BT, 25W per side via Class AB delivers clean headroom at typical near-field listening levels (1–2 meters) without the occasional harshness some Class D implementations introduce at higher SPLs. At push volumes in a small room, you'll hit the limits of the woofer excursion before the amp clips.
Are the included isolation pads acoustically effective?
Isolation pads decouple the monitor cabinet from the desk surface, which reduces low-frequency resonance coupling — the "one-note bass" effect you hear when monitors sit directly on a hard surface. For a 4.5-inch driver, the effect is audible and worthwhile: tightening perceived low-end and reducing desk-transmitted vibration. They're not a substitute for proper acoustic treatment, but they're a meaningful improvement over bare-desk placement.
Can these monitors be used as a stereo pair in a podcast or streaming setup without an audio interface?
Yes — the Bluetooth 5.0 input and 1/8-inch stereo Aux In allow direct connection from a computer, phone, or mixer without an interface. The integrated headphone amplifier with front-panel 1/8-inch jack also means you can monitor privately without routing through a separate headphone amp. For podcast recording requiring low-latency monitoring, wire directly via TRS or RCA.
Related Products
