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Details about  Shellac coated doorknob shape phase plug for Lowther full range speaker drivers

Shellac coated doorknob shape phase plug for Lowther full range speaker drivers Listed for charity

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Item condition:
Jan 16, 2014 06:28:52 EST
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10 available / 2 sold
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GBP 75.00
Approximately C $138.54
GBP 18.00 (approx. C $33.25) Economy Int'l Postage | See details
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Item location:
East Grinstead, East Sussex, United Kingdom
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Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition

full range






These are cast to order, singly and individually, from the original 1950s Lowther profile and given three coats of shellac French Polish making them blend in with the colour of the Lowther cone.

They enable the straight whizzer cones to be used, or rolled back whizzers to be converted to straight, and in doing so balance the sound removing any hint of "Lowther shout" and provide a clarity which is totally natural. They balance the sound given by the excessive detail available in the treble so that the efficiency of the unit's huge magnet gives benefit to developing the sound lower down the spectrum. The standard bullet forms a horn for very very high frequencies, and the modern Lowther pepperpot is too directional. The original profile forms a horn for lower frequencies, lower as well as higher treble, restoring balance to the sound. Perfection results.

The photograph shows the stabiliser mounted in a Lowther drive unit. (Of course the speaker driver is not included in this auction! . . . only the special shape stabiliser).

Lowther doorknobs varied slightly in design. Wooden ones were not always to the same shape and plaster ones varied in diameter according to the generation of the mould. I have personally experienced 68mm ones as well as a 66mm from which these casts are made. The slightly smaller 66mm stabiliser, as I am selling here, sounds better. I have done away with the bolt through the middle, which tends to cause problems in manufacture and use and I'm successfully casting the bolt within the body of the plaster.

They make all the difference to the smooth sound and wide treble dispersion, bringing Lowther units into the class of supreme perfection above all others. They are better than the modern Lowther stabiliser which, for my liking, results in objectionable directivity. They can be supplied foreshortened to fit cabinets such as the Acousta with a grill immediately in front of the unit. They can be supplied either as photographed with coloured streaks almost like natural stone, or as a finish as white as Mozarella cheese. These original profile phase stabilisers enable one to achieve the holy grail of Lowther sound. The units with the strongest magnets are designed to drive horns which balance out the frequency response. Depending on the behaviour of the front horn, one can need acoustic adjustment of the top treble and in this the phase plug is an important acoustical component.

The standard bullet phase plug forms a very short horn between the whizzer cone and the phase plug emphasising the very highest frequencies and sometimes too much, and most certainly when the high flux units are used in back loaded horns without a front horn, such as the Fidelio or in open baffle designs. The size and the shape of these doorknob units which are casts from the original Lowther profile form a lower frequency horn between the whizzer cone and the phaseplug. This profile of phseplug used to be used with the straight whizzer cones, which provide a clarity which is muddied in the newer rolled back whizzer design. I cut a slit in the roll-back so that I can then bring the rollback forward to form a standard straight cone. With the straight whizzer and with this profile of phase staibiliser the sound is the most supreme of all Lowthers. If you have been aware of a very top treble that is slightly too strong or agressive, then these phase stabilisers are likely to be the solution.

For PM2C units I will have to cast to special order as the voice coil former is shorter on the "C" models

These phase stabilisers are cast from plaster and can have a mottled effect, almost like a stone or marble, on account of the colouration of the release agent from the mold. They can be supplied raw or finished with a hard clear varnish, hard shellac or a gloss white paint. Alternatively I am now using a new mold from which casts emerge perfectly white. Time of delivery depends on the length of time taken by the plaster to dry out sufficiently.

This auction is for A SINGLE stabiliser.

See my other auctions for rare original mushroom porcelain phase plugs, Lowther unit servicing and repairs and good value speakers which I modify usefully as alternatives for Lowther Acousta and open baffle applications.

Business seller information

Hammerwood Park
David Pinnegar
12 Hammerwood Park
East Grinstead
East Sussex
United Kingdom


Return policy

Item must be returned within
14 days after the buyer receives it
The buyer is responsible for return shipping costs.

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Shipping and handling

Item location: East Grinstead, East Sussex, United Kingdom
Shipping to: Americas, Europe, Asia, Australia
Domestic handling time
Will usually ship within 20 business days of receiving cleared payment[newWindowTxt].

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