Originally Posted by
Earl K
(i) The model number of the 15" woofer that you used in your monitors .
(ii) Did all three models of monitors use the same woofer model ?
- The LS/2 used a 30cm L355 below 800Hz;
L355: 8-ohms, fo=40Hz, fo-5K, 98dB, 100W, 8cm Alum VC, 1.1kg Alnico, 5.7kg total
- The LS/3 used a 40cm L475 below 800Hz;
L475: 8-ohms, fo=25Hz, fo-3.5K, 100dB, 150W, 10cm Alum VC, 1.51kg Alnico, 8.6kg total
- The LS/4 used a 30cm L355 mid-bass crossed over at 800Hz and 200Hz and dual 40cm FW400S (4-ohms) below 200Hz.
FW400S: 8-ohms, fo=17Hz, fo-2.5K, 96dB, 150W, 10cm Copper VC, 1.11kg Alnico, 8.6kg total.
The L475 and the FW400S used the same frame and motor but different cones. The L475 used a lightweight edge-wound aluminum voice coil for excellent transient response and the FW400S used an extra long two-layer round copper voice coil and a coated cone to optimize the mass and reduce the fo. All woofers used an epoxy-mica former for stable high temperature operation.
(iii) The gap height ( ie; depth ) for this woofer
I'll have to dig out my drawings and let you know.
Were you also associated with Servo?
Servo Electronics (Bob Black) and Canadian Rogers Western (Kemmel Rogers) became investors in our company as we grew.
Were you involved with Servo?