Ou can measure it using Dayton DATS or with a cheap rig using RoomEQ wizard
Bypassing woofer cap -- Value too small?
As part of a crossover upgrade project, I will be changing a couple 125uF Bennic bipolar electrolytic caps in a pair of woofer crossover networks to Mundorf AC RAW bipolar eCaps. In storage, I have a couple unused Duelund CAST PIO CuAg hybrid caps with values of 0.022uF and I’m considering using them to bypass the large value Mundorf electrolytics. (I’m not interested in bypassing any caps on the mids/tweeter networks). That Duelund value is only 0.02% of the larger electrolytic cap value. Is that too small of a ratio? Any downside using a value that small that I should know about? I’m looking for more clarity in the 50hz-300hz range that the woofers’ response spans. Thanks in advance.
(The rest of the woofer cap story, in case it could be helpful... There are two other large value Bennic bipolar electrolytic caps in each of the woofer networks, both with values of 250uF each. I’ve decided to replace them with 200uF Mundorf AC RAW bipolar ecaps and add 47uF Jantzen Standard Z-Caps (metalized PP foil) in parallel on both. This is about 25%, or 1:4 ratio, so very different than the above proposition.)
Showing 3 responses by erik_squires
Sorry, Axon, not Axion.
https://partsconnexion.com/collections/axon-true-cap-film-capacitors?sort_by=price-descending |
I think it is too small, but also, keep in mind that caps that go to ground have an important ESR value associated with them. In addition to the Equivalent Series Resistance there is usually a small value resistor ( < 1 Ohm) in series with the caps and the crossover is unusually sensitive to changes in ESR on even-order filter components. That is, any change to the cap ESR must be compensated for in the adjoining resistor. You may like to try some of the Axion film caps there, btw. Really inexpensive and good sounding. |