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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Lowther PM6, PM4, PM2


For the finest sound in the world.
Basically , Lowther design has remained constant from the start since these units function on natural sonic principles which cannot be bettered. But through research, new materials and remarkably improved engineering techniques, Lowther drive units provide fantastically good performance whatever the sound source. These units are intended for use in internal folded-horn cabinets, the designs of which make electrical cross-over systems unnecessary.
Abridged technical specifications of Lowther Drive Units PM6, PM4 AND PM2 are given overleaf.


LOWTHER PM6
Overall Diameter: 228 mm
Overall Depth: 76 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 38 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 1,7 Tesla (17000 gauss)
Flux energy gap Joules x 10³: 705 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 94 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 3 kg


LOWTHER PM2
Overall Diameter: 228 mm
Overall Depth: 92 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 39 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 2,0 Tesla (20000 gauss)
Flux energy gap Joules x 10³: 976 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 95,5 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 4 kg


LOWTHER PM4
Overall Diameter: 228 mm
Overall Depth: 102 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 30 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 2,4 Tesla (24000 gauss)
Flux energy gap Joules x 10³: 1400 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 97 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 6 kg

The above units have a power handling capacity up to 60 watts when suitably housed and may be used with amplifiers up to 100 watts outputper channel.




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