Baremeg10

Thank you for a nice and descriptive thread. It helped me a lot when doing the upgrade of the canton subwoofer on my Octavia III. I see there is a lot of people have trouble with the resistor value, so I am going to help you out. Warning! I have note tested the values that is coming further down, and they are calculated from what I think will be right. (Don’t blame me if they don’t, this is jus a guide to try to help you on the right track). First, the original canton amplifier claims to push 2x100 watts into 8 ohms. This means the maximum voltage the amplifier can push at any time is <80 Volts. We are therefore calculating from 80 V so we ar on the safe side. Then we can calculate the resistance value of the resistor based on what wattage the resistor can consume without overheating. I have calculated value for a few know resistor wattages. The last value is calculated with a headroom of 25% for safety (so the resistor doesn’t get too hot) and is the value you should use. You need to connect one to each channel (two in total) ¼ W resistor = 3200 Ω * 1,25 = 4000 Ω (4 kΩ) ½ W resistor = 1600 ohms * 1,25 = 2000 Ω (2 kΩ) 1 W resistor = 800 ohms * 1,25 = 1000 Ω (1 kΩ) V = Volts W = Watts Ω = ohm (some call this resistance or impedance) All the calculations are don on this site: https://www.cuidevices.com/product/resource/calculators/speaker-power-calculator Going higher on the ohm rating on the resistor then calculated above will not cause any damage, but the canton amplifier can happen to not sense a load and therefore not turn on the subwoofer output. You should not go too much lower on the ohm rating than calculated above because this can lead to excessive heat on the resistor. I have used two 9 W resistor at 1000 ohms, probably way overkill, but was what I had laying around. I have made a short test run and cannot feel any heat at all on the resistor and the subwoofer plays as it should. Because I have only tested the 1000 ohms I cannot guarantee that 2k - and 4k resistor will work, but thread owner writes that he have used a ½ W resistor so 2 kΩ resistor should at least work. Hope this comment helps someone out so they can enjoy their new subwoofer.