Hi everybody! I need some advice regarding capacitor values for my rig. I use a Hartke 3500 head + 4.5XL cab (4x10" + 5") + 215XL cab (2x15"). I have plenty of power with it (and never used the master past 3 -goes up to 10-). But I use this very heavy sound with plenty of sub-low frequencies and I note that sometimes there's a little farting on the 4x10" cab. In theory its frequency response starts at 30Hz (exactly the same as my 2x15) but let's be serius about it, they have plenty of excursion for reproducing such sub-lows while my 15"s are hardly moving. So I'm thinking of cutting some of thise sub-low pressure on the 4x10" by simply adding a capacitor in the cable (so I don't have to modify the cab itself and also, easier to test), but here's where my electronics know-how ends. I mean, I know how to wire the entire thing, no problem, but I totally ignore what values should I use in order to cut everything under (let's say...) 250/500Hz. I know I'll have to try quite a few values 'till I find the one that brings out the balance I like, but without knowing where to start it could be endless. I read some high pass filters' table that states values for 4ohms (my rig is running in 5.2ohms) the following way: Freq(Hz). Capacitor (uF) 100 400 125 320 150 265 200 200 260 150 400 100 600 70 800 50 1000 40 1500 25 2000 20 3000 12,5 4000 10 5000 8 6000 6,5 8000 5 10000 4 Is this even near to right? If so I'm trying every value between 400 and 40 uF. Any setting that is more accurate? What frequency do "sub-lows" officially start at? Thanks so much! ANDRUCA EDIT: No money for bi-amping and, in fact, just needing to release the sub-low pressure on my 10"er cab. One more thing: what voltage should the capacitors handle given that my amp puts 350W@4ohm and here in Europe, AC power is 220V? Thanks again!