Having purchased a pair of Radford M180/50 speakers I find the crossovers have been modified (caps replaced) but there is an error in one crossover. Can anyone tell me the value of C3 and C4 on CROSSOVER FN831 M3391. The issue is that I cannot say for certain which is the correct capacitor value, one board is correct. If anyone can help I would be most grateful.
Maybe someone could be of some help if it were possible to have a look at the XO boards. Google search gave me no results in respect to the schematic.
Only stuff i have seen is here. Radford Studio S.90
I was very impressed in my youth with the S90, i have seen S360, but only seen the M180 referenced. I’d guess it is 2 sets of S90 drivers mounted in a back or sidefiring bi-pole.
At 1st blush one could look at the S90 XOs and double the size of the caps and halve the inductors (drivers in parallel). One could also just use 2 of the XOs. Which leads to thinking about bifurcating them and building 4 S90. Would be interesting stacked (you’d need 8 min ceilings).
dave
I was very impressed in my youth with the S90, i have seen S360, but only seen the M180 referenced. I’d guess it is 2 sets of S90 drivers mounted in a back or sidefiring bi-pole.
At 1st blush one could look at the S90 XOs and double the size of the caps and halve the inductors (drivers in parallel). One could also just use 2 of the XOs. Which leads to thinking about bifurcating them and building 4 S90. Would be interesting stacked (you’d need 8 min ceilings).
dave
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https://www.t-linespeakers.org/classics/radford.html
The S0- was the loudspeaker that really got me going. One of my gurus was building them in Calgary.
The above link has official Radford schema for FN11 & FN12.
Given the quality of bits available i figure that they could be gratly improved by substituting a good FR (Alpair 5.3/7ms/P7HD) as a sub for the mid & tweeter (Goodmans* + Peerless) and biamp, the 10” Goodmans bass driver is well matched to the line. Still haven’t gotten my hands on a set of S90 yet to try it on.
*(There is a version with dome mid i do not rate as good as the cone mid)
dave
The S0- was the loudspeaker that really got me going. One of my gurus was building them in Calgary.
The above link has official Radford schema for FN11 & FN12.
Given the quality of bits available i figure that they could be gratly improved by substituting a good FR (Alpair 5.3/7ms/P7HD) as a sub for the mid & tweeter (Goodmans* + Peerless) and biamp, the 10” Goodmans bass driver is well matched to the line. Still haven’t gotten my hands on a set of S90 yet to try it on.
*(There is a version with dome mid i do not rate as good as the cone mid)
dave
I am guessing that FN stands for Falcon Network, so if the info already provided doesn't answer your question you could reach out to Falcon loudspeakers in the UK. Although the drawing provided does seem to have the info you need for C3 and C4 values.