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8.2 F81 impedance
Loudspeakers are conventionally specified as having a nominal impedance of 4, 8 or 16 ohms. In practice,
of course, loudspeakers are electro-mechanical devices that interact with local acoustical conditions.
They also have internal electrical networks. All these factors result in loudspeakers having quite complex
impedance characteristics that vary with frequency.
Fig 8.2-1 F81 half-space, 1/12
th
octave impedance (ohms) vs frequency (Hz)
The F81 impedance curve is very well behaved and presents an easy load for power amplifiers – even
where pairs of F81s are connected in parallel.
Notes
Low frequency impedance characteristics may vary slightly with local boundary conditions
F81 internal networks include a protective DC blocking capacitor. This will cause your F81 to look
open circuit when measured with a regular dc resistance meter.
9 Amplifier considerations
Unless otherwise stated, power ratings in this section are average power (rms voltage x rms current –
sometimes called rms power). Your F81 has an AES 8 ohm power rating of 100W.
9.1 Recommended Funktion One power amplifiers
Funktion One E15 2-channel power amplifier (with PRC set to 0dB)
425W per channel into 8 ohms, 750W per channel into 4 ohms, 1400W per channel into 2 ohms
Funktion One F40Q 4-channel power amplifier
600W per channel into 8 ohms, 1000W per channel into 4 ohms
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