wwb@ihuxn.UUCP (Walt Barnes) (10/05/85)
I would like to build a sub-woofer for my stereo system. I know how to make crossover networks for regular speakers, but I can`t figure out how to make one work for a sub-woofer. The catch is that I want bass from both right and left channels to driver the sub-woofer. I can use caps to eliminate the low frequencies sent to my regular speakers and chokes to eliminate the high frequencies for the sub-woofer, but how do I combine the left and right low frequency signals so they can be sent to one speaker? Thanks, Walt Barnes ...!ihuxn!wwb
schley@mmm.UUCP (Steve Schley) (10/10/85)
In article <1203@ihuxn.UUCP> wwb@ihuxn.UUCP (Walt Barnes) writes: >I would like to build a sub-woofer for my stereo system. I know how >to make crossover networks for regular speakers, but I can`t figure >out how to make one work for a sub-woofer. The catch is that I want >bass from both right and left channels to driver the sub-woofer. >I can use caps to eliminate the low frequencies sent to my >regular speakers and chokes to eliminate the high frequencies for >the sub-woofer, but how do I combine the left and right low >frequency signals so they can be sent to one speaker? > > Thanks, > Walt Barnes > ...!ihuxn!wwb From your posting, I assume you are interested in a passive crossover, rather than an active one. If this is correct, the simplest way to do it is to use a dual-voice-coil driver in the subwoofer. Use a two-channel low-pass filter between the driver and the two amplifier outputs. The two coils keep the signals separate, due to their electrical isolation, and the cone sums their signals. You shouldn't have any trouble finding one of these drivers, they're fairly common. Check the advertisers in Speaker Builder... -- Steve Schley ihnp4!mmm!schley
gvcormack@watmum.UUCP (Gordon V. Cormack) (10/15/85)
> I would like to build a sub-woofer for my stereo system. I know how > to make crossover networks for regular speakers, but I can`t figure > out how to make one work for a sub-woofer. The catch is that I want > bass from both right and left channels to driver the sub-woofer. The easiest way is to put two drivers in the same box. Connect one channel to each driver. Alternatively, buy a separate amplifier for the sub-woofer. Then implement a low-power filter and mixer. There is no efficient, passive way to mix the two channels together electrically.