JBL 4530 (1970s)

The JBL 4530 is a professional bass reflex cabinet from JBL's Industrial Series of the 1970s, built for cinema and touring sound reinforcement. It's a folded horn / bass reflex hybrid — a large, heavy utility box designed to be driven by a single 15-inch woofer, most commonly the JBL 2220. Recording Engineer (April 1988, p.143) shows the 4530 used in a professional stage setup.

Surviving documentation on the 4530 is thin — no original price, exact production range, or detailed engineering data has surfaced. What the record does show is mostly consistent: the cabinet measures 30" W x 24" D x 36" H, and with a 2220 driver installed, it's rated at 8 ohms, 100 watts, 99 dB SPL (1W/1m), and 40 Hz–16 kHz. Note that some sources say the 4530 was specifically engineered around the 2220, while others say it simply accepts any JBL 15-inch woofer — the manufacturer's own documentation leans toward the 2220 pairing, so that's the safer claim.

The 4530 saw heavy use in movie theaters and nightclubs through the 1970s and 1980s, and it still has a following among DIY and vintage JBL enthusiasts. Owner feedback is genuinely enthusiastic — one forum post calls it "one of the best bass reflex cabinets JBL ever made," and another says it "hits hard and low." The caveats are practical: these boxes are big and heavy, impossible to move alone. The 2220's foam surrounds rot out and need re-foaming or re-coning, original 2220 drivers are hard to find and expensive when they appear, and the internal horn path isn't braced from the factory — owners recommend adding bracing to cut cabinet resonance. A pair in good condition typically lists in the $450–$700 range on the used market, though direct listing prices vary widely — one source listed a single unit at $350 without original drivers.

Known specs:

- Cabinet type: Bass reflex / folded horn hybrid

- Intended driver: JBL 2220 15-inch woofer

- Dimensions: 30" W x 24" D x 36" H

- Impedance: 8 ohms

- Frequency response: 40 Hz–16 kHz (with 2220)

- Power handling: 100 watts (with 2220)

- Sensitivity: 99 dB SPL (1W/1m) (with 2220)