Lowther Loudspeaker Systems Ltd.

Where Technology Becomes "Live" Music



Phase Equalizer


Lowther Phase EqualiserLowther Phase Equalizer

The Phasing Equalizer is yet another amazing innovation to come from Lowther.


As everyone who is aware of Lowther Loudspeakers knows, for more than half a century every drive unit we have manufactured has incorporated a Phasing Stabilizer. The main function of the standard stabilizer is to reduce interference caused by opposite sides of the inner cone cancelling out sound waves at certain frequencies. The function of the full stabilizer, in addition to reducing sound wave cancellations, is to act as a diffuser to guide the sound waves to the walls of a horn fitted to the front of a drive unit.


The phasing equalizer not only better achieves all that the originals can, it accomplishes so very much more.


The phasing equalizer forms a horn contour between itself and the wall of the inner cone. This allows the high frequency response to be much improved. For the same reason the higher mid-range response is also greatly improved. The reproduced sound is cleaner and clearer with much better separation of musical instruments.


The series of tubes are of a precise size, number and depth in order to maintain equal pressure either side of the cone assembly throughout the complete audible frequency range. Without some stabilizing device, pressures either side of the diaphragm assembly become increasingly unequal the lower the sound frequency to be reproduced. By fitting the new phasing equalizer the pressure both sides of the cone is equalized throughout the complete audible frequency range. The control applied to the diaphragm eliminates the possibility of over extended oscillations when the cones are moving forward. The effect is similar to fitting a forward radiating horn but without the possible distortion and coloration that such horns may develop.


Originally the phasing equalizer was designed to balance the pressure from either side of the diaphragm assembly of the Lowther DX4 Module. (The DX4M is now superceded by the EX series drive units.) The acoustic chamber fitted to the rear of these drive units requires that a compensating device be fitted to equalize the pressure. The phasing equalizer is fitted as standard to the EX series of drive units and to the DX4 and DX65, and is now available as an optional extra for all new Lowther drive units. In addition we are making it available to all existing Lowther users. The phase equalizer may be fitted to all types of Lowther drivers irrespective of age. No modifications are necessary. It is a simple task to unscrew the original stabilizer and refit the new one. Then an entirely new level of listening pleasure will be experienced.



The cost per pair of Phase Equalizers is £80.00


Please add United Kingdom V.A.T £16.00 if applicable.


The carriage charge per pair is as follows:


UK: £6.00 EU £10.00 Rest of Europe £12.00
USA & Canada £14.00 Far East & Australia £14.00 Rest of the World £16.00


You can telephone, fax or email your order.


Tel: 020 8300 9166 (Outside UK +44 20 8300 9166)
FAX: 020 8308 0778 (Outside UK +44 20 8308 0778)
Email: sales@lowtherloudspeakers.com  


When ordering, please identify the model of drive unit you have.



Despatch of phase equalizers, ex-works, worldwide, is normally within 10 working days of receipt of payment.