I have just restored a pair of Technics SB-F3 speakers. I replaced the 3 capacitors in each speakers crossover board. The original capacitors did not have any polarity markings on them, the new capacitors are polarity specific. There is no markings on the board to stipulate polarity. I have been unable to find a diagram for the crossover boards so have no way of knowing which of the solder points is + or -
Speakers are working and crossover appears to be doing the job. Issue is I have also changed the foam surrounds in the drivers. I understand it takes some time for the speakers to achieve maximum sound quality after changing driver surrounds so I'm not sure if I'm hearing this or the capcitors. They sound pretty good and the refoam went well but they are slightly 'muddy' sounding which is to be expected. I am leaving them on I order to allow the new foam to loosen up as advised but just wanted to check about the capacitors polarity just to be sure.
Thanks!
Speakers are working and crossover appears to be doing the job. Issue is I have also changed the foam surrounds in the drivers. I understand it takes some time for the speakers to achieve maximum sound quality after changing driver surrounds so I'm not sure if I'm hearing this or the capcitors. They sound pretty good and the refoam went well but they are slightly 'muddy' sounding which is to be expected. I am leaving them on I order to allow the new foam to loosen up as advised but just wanted to check about the capacitors polarity just to be sure.
Thanks!
Polarized caps are not used in crossovers, only non-polarized caps are. A bipolar electrolytic cap can be used to replace a non-polarized film cap. A bipolar electrolytic is equivalent to two series, back-wired (minus to minus or plus to plus) polarized electrolytic caps each having twice the capacitance value desired.
Paul
Paul