JBL 4301 Studio Monitor

The JBL 4301 is the baby of JBL's professional 4300 series — the smallest, bookshelf-sized monitor in a line that also included the 4310, 4311, and larger studio references. It was aimed squarely at nearfield monitoring in small rooms, and it holds a warm place in the memories of those who used them. One owner's summary, repeated in various forms across the community, is that the 4301 was one of the best bookshelf loudspeakers JBL ever made.

It's a two-way bass reflex design with a 10" woofer and a 1" soft-dome tweeter — notably not the metal dome JBL used elsewhere. The woofer uses JBL's Symmetrical Field Geometry (SFG) magnet structure, and the crossover is a simple second-order (12dB/octave) type. The cabinet is finished in walnut veneer. Period advertising in Studio Sound (December 1978, p.69) pushed the 4301 as a compact broadcast monitor that lets you hear everything you're transmitting — tape hiss, cue tone leakage, and turntable rumble included. The same ads emphasized its EIA standard rack dimensions: 19" high by 11½" deep by 12¼" wide, priced at $168 each at the time. Later sources put the retail at $567 per pair circa 1985.

Specs that are documented: frequency response 62Hz–22kHz, sensitivity 89dB (1W/1m), 8-ohm impedance, 60W power handling, crossover at 2.5kHz, and dimensions of 480mm × 280mm × 280mm. Weight is 13.5kg (30 lbs).

The sound is described as warm, forgiving, and easy to listen to for long sessions — not harsh like some studio monitors. Bass is surprisingly deep for a 10" woofer in a small box, though it rolls off earlier than the larger 4311s. Imaging is strong in the nearfield, with the sweet spot right at tweeter axis. The known weaknesses: the stock tweeter can sound a bit rolled off in the very top octave compared to modern ribbons, and the tweeter level switch on the back is prone to getting dirty and causing intermittent sound — a shot of DeoxIT usually sorts it.

If you're looking at a pair today, expect to pay $300–$500. Original foam surrounds on the woofers will almost certainly need re-foaming if they haven't been done already, and the original tweeter (JBL 034) is scarce — if one is blown, a drop-in replacement is hard to find. Owners also recommend replacing the original crossover caps with polypropylene if they haven't been touched; it makes a significant improvement.