Lowther A45

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.1dB
• Frequency response 80 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 82Hz
• Mechanical quality factor QMS 5.99
• Electrical quality factor QES 0.59
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 11cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.4Ω
• Inductance (1kHz) LE 0.137mH
• VC Diameter 39mm

Magnet

• Flux density B 1.75T
• Force factor Bl 7.82N/A
• Motor constant Bl/√RE 2.87N/√W
• Air gap height HAG 5mm
• Diameter 91mm
• Material Alcomax 3

Diaphragm

• Effective diameter 116mm
• Effective area SD 106cm²
• Moving mass MMS 7.62g
• Moving mass (without air load) MMD 6.7g
• Material Twin Paper

Suspensions

• Stiffness KMS 3.8N/mm
• Compliance CMS 263µm/N
• Equivalent volume to the compliance VAS 4.15L
• Mechanical resistance RMS 0.66N·s/m

Dimensions

• Nominal diameter 7″
• 174mm
• Overall diameter 174mm
• Baffle cutout diameter 137mm
• Overall depth 105mm
• Flange thickness 9mm
• Mounting depth 96mm
• Volume occupied by the driver (estimated) 0.73L