JBL T540

Name: JBL T540
Brand: JBL

The JBL T540 is a wired in-ear headphone from JBL's T-series lineup. It is a budget model that sold widely and is barely documented the way vintage audio gear usually is. There's no formal review history from the major audiophile press, no launch announcement that survives in the period record, and no confirmed production years. A 1983 issue of High-Fidelity-Trade-News (March 1983, p.25) mentions a Jensen T-540, but that is a different product (a 6-by-9 inch two-way car speaker), not this in-ear headphone. What the T540 does have is a solid paper trail of retail listings and user reviews, and nearly everything known about it comes from there.

The specs are consistent across sources: a 10mm dynamic driver, 16-ohm impedance, 20Hz-20kHz frequency response, and 102 dB sensitivity at 1kHz/1mW. The cable is 1.2 meters of flat, tangle-resistant wire ending in an angled 3.5mm jack, with a one-button remote and microphone for answering calls and controlling playback. Weight is listed at 15.8g, though sources disagree on whether that figure includes the cable. It shipped with three sets of eartips (S/M/L) and, in most regions, a carrying pouch.

Reception comes from retail and casual reviews, not formal criticism. The T540 reads as a decent value with a clean, balanced sound and a slight bass boost that suits pop and hip-hop. The flat cable resists tangling, and the inline mic works well for calls. Complaints center on bass that overpowers acoustic and classical material, eartips that are hard to seat securely in smaller ears, and a thin cable that feels fragile near the jack. Several users reported cable failure after about six months of heavy use, and some noted one earbud losing volume over time. One retailer positioned the T540 as an affordable step up from the T110 but less feature-rich than the T550/T560. That lineage claim appears in only that single source.

Current street pricing runs roughly $29-$49 depending on seller and region. There is no collector's market for this model. It's a budget consumer product, still widely available, with no spare parts offered officially. Replacement cables and eartips are aftermarket-only.

Known specs: