JBL LSR308P MK3 Aktiv studiomonitor

JBL LSR308P MK3 — 8-Inch Powered Studio Monitor With Reference-Grade Imaging

The JBL LSR308P MK3 is a bi-amplified 8" two-way powered studio monitor engineered for project studios, post-production rooms, and educational facilities that demand accurate full-range playback. Built around a redesigned 203 mm low-frequency driver and a 25 mm silk dome tweeter, this third-generation 3 Series model extends its usable response from 41 Hz up to 40 kHz, putting genuine sub-bass reach and extended high-frequency detail on the desk. A pair of integrated Class D amplifiers delivers 55 W to each driver for a combined 110 W of clean headroom, allowing the cabinet to reach 113 dB peak SPL without losing transient definition.

JBL's patented Image Control Waveguide shapes a wide 120° × 90° sweet spot so engineers and producers hear a consistent stereo image whether they sit directly in front of the speaker or off to the side. The double-flared Slipstream port keeps low-frequency airflow laminar at high output, reducing port turbulence and the muddy bass coloration that plagues many ported designs. Together, these technologies give the LSR308P MK3 the imaging precision and bass control that have made the 3 Series a fixture in music, film, and broadcast production worldwide.

What Sets This Monitor Apart in Its Class

Two design choices distinguish the LSR308P MK3 from typical nearfield monitors in its segment. First, the 81 onboard DSP room-tuning presets — accessed through four rear-panel controls — let users compensate for desktop, stand, or wall placement and adjust boundary response plus high- and low-frequency balance without external processing. Second, eight integrated M4 mounting points in a 75 × 75 mm pattern allow upright, inverted, wall, or ceiling installation.

Driver System and Amplification — Headroom That Holds Together

Power and driver design determine whether a monitor stays composed when a mix gets loud. The LSR308P MK3 uses a dedicated amplifier for each transducer rather than a single full-range amp, which keeps intermodulation distortion low and preserves transient attack on percussive material.

• LF Driver: 203 mm (8") — long-throw woofer reaching down to 41 Hz for genuine sub-bass monitoring without a subwoofer
• HF Driver: 25 mm (1") soft dome — silk dome tweeter for smooth, fatigue-free highs out to 40 kHz
• Bi-Amplification: 2 × 55 W Class D — separate amps for each driver deliver 113 dB peak SPL with low self-noise

Connectivity and Room Adaptation — Built for Real Studios

Studio monitors live or die by how well they integrate with the room and the signal chain. The LSR308P MK3 ships with the connectivity and tuning flexibility that working rooms demand, from project bedrooms to commercial control rooms.

• Inputs: Balanced Neutrik combo jack (XLR / 6.3 mm TRS) — accepts professional +4 dBu and consumer -10 dBV signal levels via rear-panel sensitivity switch
• Room EQ: 81 DSP presets via four rear-panel controls — HF shelf at 3 kHz and LF shelf at 300 Hz, each adjustable in -2 dB / 0 dB / +2 dB steps
• Crossover: 1960 Hz — Linkwitz-Riley transition between woofer and tweeter for phase-coherent imaging

Enclosure, Imaging, and Build Quality

Cabinet behavior shapes imaging as much as the waveguide does. The LSR308P MK3 uses a front-firing Slipstream port for clean, low-turbulence airflow at any listening level.

• Coverage: 120° horizontal × 90° vertical — broad sweet spot from the Image Control Waveguide for accurate off-axis listening
• Cabinet Dimensions: 444 × 249 × 296 mm — compact footprint suitable for desktop, stand, or wall mounting via integrated 75 × 75 mm M4 mounting points
• Net Weight: 8.8 kg — solid, vibration-resistant mass that stays planted on a desk or stand at high SPL

Who the JBL LSR308P MK3 Is Built For

The LSR308P MK3 is the right choice for project-studio owners, post-production engineers, and music producers who need an 8" monitor with genuine sub-bass reach, room-tuning flexibility, and reference-grade imaging at a nearfield price point. Tracking engineers benefit from the 113 dB peak SPL headroom when checking loud material, while mix engineers gain confidence from the waveguide's wide sweet spot and the 81 DSP presets that tame problematic low-frequency buildup near walls or on desktops. Educational facilities and immersive-production rooms will appreciate the balanced Neutrik combo input, the +4 dBu / -10 dBV sensitivity switch, and the rugged enclosure that survives daily studio use.