The Denn JS passive speaker series comes in two sizes — a 12" version (JS-12) and a 15" version (JS-15) — both built in rugged birch-plywood enclosures with black lacquer finish and steel grilles. The JS-12 provides 250W RMS (500W peak), a frequency response of 50Hz-16kHz, sensitivity of 92dB, and maximum SPL of 126dB, with a 12" low-frequency driver and a 34mm high-frequency driver, plus 90 °X40 ° dispersion and SpeakON/AP6 connectors.  The larger JS-15 bumps the power handling to 300W RMS (600W peak), extends the low end to 40Hz ( ±3dB), sensitivity to 95dB, and SPL to 128dB; it features a 15" LF driver, the same 34mm HF compression driver, 90 °X45 ° coverage, and identical rugged construction and connector options.