JBL 3310

A compact two-way with a sealed box and a dome tweeter. The 3310 is JBL's quiet overachiever.

Overview

The JBL 3310 weighs 7.5kg and measures roughly 280mm wide by 410mm tall by 170mm deep. It sits on a shelf or a stand and looks like a modest bookshelf speaker in a wood-grain cabinet. It was designed and manufactured in the USA, and it is built around tight, controlled bass instead of boom. It wants patient setup and a decent amplifier. Owners who have kept theirs for a decade and a half or more are common.

The 3310 is a two-way design with a 20cm cone woofer and a 2.5cm dome tweeter. JBL described the enclosure as "modified acoustic suspension," which sets it apart from the ported, reflex designs that dominated the consumer market. Ported boxes often trade transient speed for low-end extension. The sealed 3310 gives a drier, more articulate bass that blends well with the midrange. The voicing is monitor-style: direct, and free of the one-note thump of lesser designs.

Sources describe the 3310 both as a "Control Monitor" and simply as a bookshelf speaker, and both labels fit. It's not a studio behemoth like JBL's larger professional monitors, but it shares a flat-ish response, a forgiving impedance, and a music-first presentation with them. Owners report running them happily with era-appropriate receivers, and the general consensus is that they simply sound good. Period advertisements in professional audio publications placed JBL's professional loudspeaker systems in cinema and installed-sound applications, reflecting the company's broader engineering focus Sound and Communication (April 1990, p.114).

Key Features

Modified Acoustic Suspension Enclosure

The sealed enclosure is the core of the 3310's design, and JBL called it a "modified acoustic suspension" system. Unlike a bass reflex cabinet with a port or passive radiator, the sealed box uses the air inside as a spring. That controls the woofer's excursion and gives a natural, second-order roll-off below resonance. The bass is taut and well-defined rather than exaggerated, and it suits jazz, acoustic music, and vocals well. It also makes the 3310 less fussy about room placement than ported designs, so boundary reinforcement and port chuffing matter less. The trade-off is efficiency. Sealed boxes are typically less sensitive than ported ones, and the 3310's 90dB/W/m rating reflects that. It's not a difficult load, but it likes clean power.

20cm Cone Woofer

The low-frequency driver is a 20cm cone type, roughly 8 inches, mounted in the sealed enclosure. It handles everything from the bottom end up to the 3.5kHz crossover point. In a sealed box the woofer works with controlled damping, which gives the clean, articulate low end the 3310 is known for. It's not a subwoofer by any stretch, but for a bookshelf speaker this size it has good weight and authority. The 60Hz - 25kHz frequency response figure says the rest: bass rolls off gently below 60Hz, and what's there is solid and musical, not hyped or bloated.

2.5cm Dome Tweeter

Up top is a 2.5cm dome tweeter, roughly one inch, handling frequencies from 3.5kHz on up. Dome tweeters were becoming common in the era, offering smoother off-axis response and lower distortion than many cone or horn designs. The dome's light weight and controlled resonance give an extended top end that reaches 25kHz. That is beyond the limits of most human hearing, but useful for the harmonic structure of cymbals, strings, and vocals. Owners note that the 3310 can sound "a bit bright," which is likely a function of the dome tweeter's forward presentation. The smoothness of the design balances it. The tweeter reveals detail without turning harsh, provided it's paired with decent amplification.

Bookshelf-Friendly Dimensions

At 280mm wide, 410mm tall, and 170mm deep, the 3310 is genuinely bookshelf-sized. The wood-grain finish is straightforward and unpretentious, and the speaker blends into a room. The compact footprint still carries some presence. At 7.5kg it feels solidly built, and the sealed enclosure adds rigidity that keeps cabinet coloration in check. One owner did note that the cabinets feel "resonant" compared to larger JBL models, but for most listeners in typical rooms it's a non-issue.

Easy to Drive, Forgiving to Match

The 3310 has a nominal impedance of 8 ohms and a sensitivity of 90dB/W/m, so it's a friendly load for just about any amplifier. The recommended amplifier output is 10W to 75W, which covers low-powered tube amps and solid-state receivers alike. Owners report excellent results with era-appropriate Marantz receivers, and the 2230 and 2265 have both come up in owner discussions. The speakers are known to sound "really good" right out of the box. The 3.5kHz crossover point keeps the woofer and tweeter each in their comfort zones and makes for a smooth transition between drivers. It doesn't demand exotic electronics. It needs a competent amp and a decent source.