Field Coil
Lowther Drive units

The Grand Opera Collection

The Grand Opera Collection represents the absolute pinnacle of acoustic artistry.

GRAND OPERA COLLECTION

Without Compromise

Three curated instruments, the Field Coil, PM4A and PM7A -  built to the highest specification possible.

Available exclusively by commission and priced upon request, these bespoke instruments employ components made with the highest grade permalloys or soft magnetic irons - materials where absolute performance is essential.

Each Grand Opera instrument is uniquely numbered and created entirely to order through a collaborative process between client and craftsman. The result transcends conventional audio reproduction, revealing musical nuances and emotional subtleties that remain hidden to lesser instruments.

This is the ultimate expression of the Lowther acoustic masterpiece for those who accept no compromise in their pursuit of musical truth.

PM4A Grand Opera Collection
Field Coil Grand Opera Collection
Field Coil Grand Opera Collection
PM7A Grand Opera Collection
Field Coil Grand Opera Collection

The Grand Opera Collection

For those who accept no compromise.

Lowther Field Coil

Field Coil Motor

Price on commission
Frame Size: 8 Inch
Magnet Type: Field Coil
Voice Coil: Aluminium/Silver
Impedance Options: 8/15 Ohms
Metal Work: Permalloy/Soft Iron
Commission
Lowther PM4A

PM4A

Price on commission
Frame Size: 8 Inch
Magnet Type: Alnico
Voice Coil: Aluminium/Silver
Impedance Options: 8/15 Ohms
Metal Work: Permalloy/Soft Iron
Commission
Lowther PM7A

PM7A

Price on commission
Frame Size: 8 Inch
Magnet Type: Alnico
Voice Coil: Aluminium/Silver
Impedance Options: 8/15 Ohms
Metal Work: Permalloy/Soft Iron
Commission

Specifications

Materials, Dimensions, and more.
Name
Field Coil
PM4A
PM7A
Frame Size
8 Inch
8 Inch
8 Inch
Phase Plug
Gold Cap
Voicecoil Options
Standard/Silver
Standard/Silver
Standard/Silver
Ohm Options
8/15 Ohms
8/15 Ohms
8/15 Ohms
Shipping weight
-
10 kg/each
4 kg/each
Overall diameter
22.5 cm
22.5 cm
22.5 cm
Overall Depth
-
15.5 cm
11 cm
Magnet type
Field Coil
Alnico
Alnico
SD
-
165mm
165mm
SPL
-
97 Db+
94 Db+
Q(es)
-
0.172
0.328
Q(ms)
-
3.75
4.338
M(md)
-
11.0 g
11.0 g
FS
-
45 Hz
45 Hz
Performance Graphs

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The Lowther AudioVector horn speaker with full range drivers.
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