KEF SP 1057

Data

General

• Manufacturer: KEF
• Model: B110B/ SP 1057;
• Years of manufacture: from about 1975 onwards;
• Manufactured in:
• Colour:
• Weight: 1.13 kg.
• Original price approx:

Technical Data

• Construction: (cone/ dome/...)
• Diameter: 110 mm;
• Power handling: 28 V (sinus), fullrange 50 W;
• Frequency response: 55 - 3500 Hz;
• Impedance: nominal 8 ohms;
• Sound pressure level:

Thiele-Small parameters

• Impedance (Zmax):
• Diaphragm area (Sd): 92 cm²;
• Resonant frequency (Fs): 37 (+/- 5) Hz (free air);
• DC resistance (Re): 7.1 Ohm.
• Voice coil inductance (Le):
• Mechanical Q factor (Qms): 2.44;
• Electrical Q-factor (Qes): 0.38;
• Total Qts:
• Equivalent volume (Vas): 23.6 L;
• Diaphragm displacement volume (Vd):
• drive factor (Bxl):
• total moving mass (Mmd):
• effective moving mass (Mms): 9.8 gm;
• mechanical losses (Rms):
• Diaphragm Stroke (Xmax, linear): 6 mm.
• Efficency Bandwith Product (EBP):

Special Features.

• Bextren diaphragm.

Comments

Other models in the same series:

• B110A SP 1003 with the same diaphragm diameter.

Links

• datasheet at KEF.