Joben Magooch
Well-known member
Just kind of randomly came to me, so this might not be particularly well thought through, but I'm wondering if anyone's come up with a simple way to try simulating different cable capacitances?
Reason I'm asking...I recently rewired my whole rig with Mogami 2314 cable, which is 33.5 pf/ft. Previously, it had been wired up with Mogami 2319, which I believe comes in at 47.5 pf/ft.
Since doing that re-wire I have noticed everything is quite a bit brighter than before. I guess this is to be expected with lower capacitance cable but it seems like a more pronounced difference than I'd expect from ~14 pf/ft. I've only got about 20 feet of patch cable throughout my board, so I suppose I could simply say I've now got ~280pf less capacitance across the whole board?
Anyways, I suspect there are more variables than just that at play, but it got me thinking that it would be interesting to whip up some sort of simple box to test out simulating different cable capacitances. As I understand it capacitance basically serves as a low-pass filter so I would think some sort of simple adjustable capacitor in-line would serve a similar effect? I'm kind of thinking of something akin to a "decade box" but don't really have any more than just that nebulous idea. Not exactly sure how to wire that up, nor am I sure what kind of math would be required to know how much capacitance to add to the path. For instance, as above, if 20 feet of 2314 would have a total capacitance of 670pf and 20 feet of 2319 would have a total capacitance of 950pf, then would simply adding a ~280pf cap more or less provide the same capacitance-tone as though it were still wired up with 2319?
I'm thinking of a passive device here as I don't really need/want anything lower capacitance than I already have but I guess with some sort of active box you could go that way, too.
Reason I'm asking...I recently rewired my whole rig with Mogami 2314 cable, which is 33.5 pf/ft. Previously, it had been wired up with Mogami 2319, which I believe comes in at 47.5 pf/ft.
Since doing that re-wire I have noticed everything is quite a bit brighter than before. I guess this is to be expected with lower capacitance cable but it seems like a more pronounced difference than I'd expect from ~14 pf/ft. I've only got about 20 feet of patch cable throughout my board, so I suppose I could simply say I've now got ~280pf less capacitance across the whole board?
Anyways, I suspect there are more variables than just that at play, but it got me thinking that it would be interesting to whip up some sort of simple box to test out simulating different cable capacitances. As I understand it capacitance basically serves as a low-pass filter so I would think some sort of simple adjustable capacitor in-line would serve a similar effect? I'm kind of thinking of something akin to a "decade box" but don't really have any more than just that nebulous idea. Not exactly sure how to wire that up, nor am I sure what kind of math would be required to know how much capacitance to add to the path. For instance, as above, if 20 feet of 2314 would have a total capacitance of 670pf and 20 feet of 2319 would have a total capacitance of 950pf, then would simply adding a ~280pf cap more or less provide the same capacitance-tone as though it were still wired up with 2319?
I'm thinking of a passive device here as I don't really need/want anything lower capacitance than I already have but I guess with some sort of active box you could go that way, too.
