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Monacor SPH-135AD Bass / Midrange

Monacor SPH-135AD.

This 135mm / 5¼" unit is used in the Sterling Broadcast LS3/5a and is universally acknowledged as the best modern and superior alternative to the classic Kef B110.
Featuring a mineral loaded (carbonised) polypropylene cone with a high internal damping factor, this unit offers a flat extended response with non of the large midrange peaks that plagued the majority of bextrene coned B110s.

This drive unit is a drop in replacement for the majority of speakers; due to the huge & varied range of applications that used the B110s (or variants thereof such as the Swisstone PP cone as found in Rogers), some cabinets may need a slight adjustment to ensure a perfect fit; any efforts are well worthwhile as the sound quality of these Monacor units is simply excellent.

A great replacement for a huge range speakers including various models from Mission, Castle, JPW, Rogers and others.

Key Features:

  • Mineral Loaded PP Cone
  • Smooth Frequency Response
  • Large Ferrite Magnet
  • Vented Pole Piece
  • Excellent Value

Basic parameters:

Resonant frequency (fs) 39 Hz Nominal impedance (Zn) 8 Ω
Mechanical  Q factor (Qms) 3.40 DC resistance (Re) 6 Ω
Electrical Q factor (Qes) 0.42 Max power handling 60W
Total Q factor (Qts) 0.37 Sensitivity (2.83V/1m) 89 dB
Equivalent volume (Vas) 26L Chassis diameter (pincushion profile) 135 mm


Here's the full datasheet:

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