Hello,
I've been reading through this thread: https://forum.allaboutcircuits.com/threads/subwoofer-passive-low-pass-filter.118184/ with interest.
I'm looking to do something very similar, using an 'off-the-shelf' filter from: http://www.avsl.com/product/900.584UK-subwoofer-filters
The filter has all the right parameters apart from it's designed for a 4 ohm speaker and I'd like to use it with an 8 ohm speaker. I've seen kits of eBay and Amazon etc. where the 400W version (http://www.avsl.com/product/900.582UK-subwoofer-filters) is sold with a 47uF 100V Bi-Polar Electrolytic capacitor, which when swapped for the 188uF (already solder onto the board) makes it suitable for use with an 8 ohm speaker, but alters the cut-off to approximately 300Hz, instead of 120Hz.
I'm not concerned about the cut-off, as the subwoofer is happy with any frequency below 1kHz. However, what I don't know is the value of the capacitor on the 600W version and whether or not swapping it for a 47uF 100V Bi-Polar Electrolytic capacitor will be suitable?
I did contact the supplier (AVSL), but they were unable to provide any technical information and just referred me to the re-seller.
I'm assuming that the capacitor in both filters is the same (although unmarked on the 600W version), with the only difference being the inductor using a heavier gauge of wire for the winding, as it's listed as being 60 grams heavier?
Any advice would be much appreciated. I look forward to hearing from you.
Kind Regards
Edward
I've been reading through this thread: https://forum.allaboutcircuits.com/threads/subwoofer-passive-low-pass-filter.118184/ with interest.
I'm looking to do something very similar, using an 'off-the-shelf' filter from: http://www.avsl.com/product/900.584UK-subwoofer-filters
The filter has all the right parameters apart from it's designed for a 4 ohm speaker and I'd like to use it with an 8 ohm speaker. I've seen kits of eBay and Amazon etc. where the 400W version (http://www.avsl.com/product/900.582UK-subwoofer-filters) is sold with a 47uF 100V Bi-Polar Electrolytic capacitor, which when swapped for the 188uF (already solder onto the board) makes it suitable for use with an 8 ohm speaker, but alters the cut-off to approximately 300Hz, instead of 120Hz.
I'm not concerned about the cut-off, as the subwoofer is happy with any frequency below 1kHz. However, what I don't know is the value of the capacitor on the 600W version and whether or not swapping it for a 47uF 100V Bi-Polar Electrolytic capacitor will be suitable?
I did contact the supplier (AVSL), but they were unable to provide any technical information and just referred me to the re-seller.
I'm assuming that the capacitor in both filters is the same (although unmarked on the 600W version), with the only difference being the inductor using a heavier gauge of wire for the winding, as it's listed as being 60 grams heavier?
Any advice would be much appreciated. I look forward to hearing from you.
Kind Regards
Edward