JBL S2500
The JBL S2500 is a floorstanding, three-way bass-reflex loudspeaker from JBL's "S" series. The family also includes the S2600, S3100, and S3500. JBL positioned the S-series as a further development of its earlier K2 series, and the S2500 sits at the entry level, below the larger S2600 and S3100. It's a slim cabinet for a floorstander, measuring 880 x 250 x 330 mm and weighing 19.5 kg (sources conflict on whether this includes packaging).
The driver arrangement is the interesting part. Two 20 cm lower-midrange drivers have membranes that oscillate in opposite directions to each other. This push-push, opposing-motion principle is meant to cancel reactive forces. Above those sits a 25 mm dome tweeter. The crossover points are 280 Hz and 3 kHz. The speaker is rated at 4 ohms nominal, with a sensitivity of 90 dB (2.8 V/m), a frequency range of 32-30,000 Hz, and power handling of 150 watts nominal / 220 watts music.
The record on this model is thin. No production years, original price, or official JBL brochure material have surfaced, and the specs above come from aggregator databases. Owners in the Hifi-Gallery community describe the S2500 as a very musical speaker with an open midrange. Compared to the S2600 and S3100, it's said to lack the last bit of refinement and to have somewhat lighter bass. One owner notes the tweeter is tuned more reserved from the factory than the S3100's, and recommends the speaker for rooms of 25 m² and up. The same owner reports that the foam surrounds on the 20 cm drivers are known to deteriorate with age. Check them on any example today.
Period press mentions are scarce. An Audio (March 1993, p.89) classified listing shows the S2500 in dealer advertising of the era. No substantive review of the model has surfaced.
- Type: 3-way bass reflex, floorstanding
- Drivers: 2 x 20 cm lower-midrange (opposing-motion membranes), 1 x 25 mm dome tweeter
- Crossover: 280 Hz / 3 kHz
- Frequency range: 32–30,000 Hz
- Impedance: 4 ohms
- Sensitivity: 90 dB (2.8 V/m)
- Power handling: 150 W nominal / 220 W music
- Dimensions (H x W x D): 880 x 250 x 330 mm
- Weight: 19.5 kg (sources conflict on whether this includes packaging)
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