JBL K110

A 10-inch JBL musical-instrument driver with an alnico magnet, an 8-ohm voice coil, and a reputation for brightness that collectors either love or politely work around.

Overview

The K110 never got a glossy catalog page of its own, yet it keeps turning up in odd places. It has been bolted into a Rivera-era Fender Super Champ, buried in a Strongbox portable system, and listed on a forum by someone who found one in a box of parts. It's a raw 10-inch speaker, an 8-ohm unit built around an alnico magnet, and it belongs to the same K-series family as the better-known K120 and K140. Those are the drivers guitarists name-drop. The K110 sits a rung down in profile - less famous, less expensive, and arguably more interesting for that reason.

Size is the first thing a buyer has to sort out. Product listings from Dan Jam LLC describe the K110 as a 10-inch speaker in explicit terms - "JBL K110 8 ohm 10" Speaker" and "NOS Recone JBL K110 8 ohm 10" Speaker" - while a handful of recording credits on Bandcamp and SoundCloud refer to an "8" JBL K-110 speaker." That's a real conflict in the record, and the available documentation doesn't resolve it. The product listings point to 10 inches, and the research page's own description of the K110 as a "10" woofer (raw driver)" agrees. Treat the 8-inch references as likely a transcription slip. A seller may still call one an 8-incher, so measure before you buy.

What the K110 is for is clearer than what it measures. The driver shows up in guitar amplification, in a DIY two-way bookshelf project, and in JBL's own portable reinforcement systems. It's a musical-instrument speaker flexible enough to serve in a hi-fi context, which not every JBL driver of the period can claim.

Key Features

Alnico Magnet and 8-Ohm Voice Coil

Both of the sold listings documented on The Gear Page identify the K110's magnet as alnico, and Dan Jam's product listings and The Gear Page both give the impedance as 8 ohm. Alnico is the detail that gets collectors' attention. It's the magnet formulation associated with the classic era of JBL musical-instrument drivers, and it's a big part of why a working K110 is worth chasing rather than replacing with something modern. The 8-ohm rating makes the driver easy to pair with a wide range of guitar amps and hi-fi gear.

Documented Pairs and Originality

One matched pair that surfaced on The Gear Page was described as "100% original" with close serial numbers and as having been a matched pair since birth. That's useful provenance when you're buying two drivers and want them to behave identically. A separate pair carried replacement labels but was otherwise reported as all original. For a driver this old, "original cones and original magnet assembly" is the phrase to look for. Anything reconed is a different proposition, and the market prices reflect that.

A 2.0 kHz Crossover in a DIY Two-Way

The K110 turns up in a Stereophile DIY two-way bookshelf speaker project, where it was paired with a 2.0 kHz crossover. That's a useful data point for anyone thinking about repurposing a loose driver: someone with a measurement mic and a crossover design already decided the K110 was worth building around in a domestic two-way. In that project the driver reportedly delivered a clean mid-band and a controlled low end — praise that lands squarely on the midrange, which is where a 10-inch JBL of this type tends to earn its keep.

Brightness as a Design Character

Forum comparisons against the JBL D110 are blunt about the K110's tonal signature. One poster allowed that a D110 would be the better - though more expensive - choice, then added that even the D110 might be too bright, and characterized the K110 as bright but not as over the top as the alternative under discussion. So the K110 is regarded as a bright speaker, and the argument in the thread is about how bright, not whether. If you want a dark, mellow guitar speaker, this isn't it.

Historical Context

Production years for the K110 aren't documented in the available sources, and no original retail price for the driver itself has surfaced. What is documented is where JBL put it. The K110 was used in the JBL Strongbox series of portable systems, including the 4631 and 4682 models. Recording-Engineer (August 1976, p.25) covered the Strongbox line's launch, noting the 4631 packed four K-110 10-inch extended-range musical instrument loudspeakers into an airfreight-proof thermoplastic case at $951. That figure is the price of the complete 4631 system, not the driver.

The driver also turns up in the Fender Rivera-era Super Champ, according to recording credits. That's a small, well-regarded amp.

Collectibility & Value

The K110 occupies an odd spot in the market: respected enough to command real money in good condition, but not so revered that prices have run away. The research page's summary - a solid, affordable 10-inch JBL woofer rather than a rare collectible - still reads true, though the current listings complicate it. Dan Jam LLC has offered a NOS recone at $429.99, a used 8-ohm 10-inch example at $299.99, and another at a regular $449.99 marked down to $374.99. A used example was also recently listed at $49.00, undated and uncorroborated. Condition, originality, and whether the cone is a factory original or a recone account for most of the spread between $49 and $450.

Condition reports from owners are encouraging. One seller noted that aside from accumulated dust the cones were essentially perfect, with no voice coil rub, no rattles, and zero issues. Another described the K110 as a transparent, articulate speaker that's relatively lightweight.

The one universal caveat is the foam surround. Surviving examples are almost universally in need of replacement, a point raised by both a Parts Express reviewer and a Stereophile editorial note. Refoaming or reconing is common enough to count as routine maintenance rather than a red flag. A driver with a crumbling surround isn't broken, but it isn't a drop-in either. A recone changes the character of the speaker, so collectors will want to know which one they're getting.