Overview

The JBL 308P MkII is a bi-amplified near-field studio monitor with an 8-inch woofer and a 1-inch Slip Stream high-frequency driver, delivering the same Image Control Waveguide technology as the 305P MkII in a larger, more full-range format. Powered by 112 watts of total Class D amplification, the 308P MkII extends the low-frequency response down to 37 Hz, providing substantial bass reproduction that allows producers to make confident low-end mixing decisions without relying on a subwoofer. The Image Control Waveguide maintains its wide, consistent dispersion pattern at this larger scale, providing excellent stereo imaging and an expansive sweet spot that accommodates natural head movement during mixing sessions. The frequency response is smooth and neutral across the entire range, with detailed mids, a refined high end, and bass that is tight and controlled rather than boomy or exaggerated. Boundary EQ and HF trim switches on the rear panel allow room-specific adjustments. The larger cabinet delivers a more open, spacious sound with greater dynamic headroom than the 5-inch model, making it suitable for medium-sized studios. Build quality is solid with a well-braced enclosure and professional-grade connectors. These monitors are ideal for intermediate to advanced producers and engineers working in rooms large enough to accommodate 8-inch monitors at an appropriate listening distance. The physical size and weight make them less suitable for compact desktop setups where space is at a premium.

Studio Monitors

An 8-inch monitor with Image Control Waveguide extending bass response to 37Hz, providing full-range monitoring with the same wide sweet spot and neutral accuracy in a larger format.

Instrument Details

$249 Intermediate
Brand JBL
Type Near-Field Studio Monitor
Made In China
Year 2017
4.6 1 vote

AI Reviews

4.6 /5

The 308P MkII excels at providing a 'big' sound without the 'big' price tag. The Image Control Waveguide remains a game-changer, offering a spatial imaging depth that rivals monitors twice the price. This wide sweet spot is a lifesaver for producers who move around their desk while tracking or mixing. Frequency-wise, the 8-inch driver provides a satisfyingly deep 37Hz floor that is tight and controlled rather than boomy, though the rear-firing Slip Stream port means you'll need to keep them at least a foot away from walls to avoid muddy low-end buildup.

The transition between the woofer and the 1-inch tweeter is impressively seamless, providing a transparent midrange that makes vocal leveling straightforward. On the downside, the Class D amplifiers exhibit a faint 'hiss'"a common quirk of the 3-series"which might irritate those working at very low volumes in ultra-quiet, treated spaces. Additionally, the glossy plastic baffle feels a bit 'consumer' and is a magnet for fingerprints. Despite these minor gripes, the 308P MkII is a value powerhouse. It is perfectly suited for intermediate producers in bass-heavy genres like hip-hop or EDM who require full-range monitoring and reliable translation without the immediate need for a dedicated subwoofer.

Category Ratings

Studio Monitors
4.6
Feb 15, 2026
AI-Generated Review Generated via Google API. This is an automated evaluation, not a consumer review. Learn more
JBL 308P MkII Screenshot

Added: Feb 12, 2026

jblpro.com/products/308p-mkii