Remarks:
The KEF C25 is a vintage two-way, passive bookshelf speaker manufactured by the renowned British audio company KEF. Introduced around 1988 as part of the classic C-Series, it was marketed as a high-quality "mini-monitor" designed for music lovers assembling their first premium audio setup
Enclosure Type: Closed box / Sealed box
Nominal Impedance: 4 ohms
Frequency Response: 65 Hz to 20 kHz (±3dB)
Sensitivity: 87 dB for a pink noise input of 2.83V
Power Handling: 110W maximum
Dimensions (W x H x D): 205 x 340 x 175 mm (8.1 x 13.4 x 6.9 inches)
Weight: 4.1 kg (9 lbs) per speaker
Internal Components:
- Woofer/Bass Unit: The KEF B160 (SP1235), featuring a 160 mm (6.5 inches) cone driver with a lightweight polymer diaphragm.
- Tweeter: A 19 mm (0.75 inches) metal dome tweeter (SP1241) designed to provide clear, detailed highs.
- Crossover: Custom KEF SP2145 circuit network.
Sound Character and Placement:
Because the KEF C25 features an acoustic suspension (sealed box) design rather than a rear port, it does not suffer from boomy bass when placed close to walls. This makes them incredibly flexible for small spaces, true bookshelves, or desktop use. They are highly regarded among vintage audio collectors for their mid-range clarity, vocal precision, and excellent imaging. However, given their 4-ohm impedance and moderate 87 dB sensitivity, they benefit significantly from a stable, high-quality amplifier rather than a budget AV receiver