Gear: Walter Woods Ultra, Sadowky PJ/4 Active, Lakland Joe Osboren Passive, Radial JDI with Jensen transformer passive. What I want to accomplish: I would like to use both instruments one plugged into each channel of the WWU so I can have each bass eq'd to its output, being the Sad is much hotter than the Joe. I would then like to run the signal to the board out of the WWU DI send probably using the PRE selector since it's easier for the soundman to set the EQ and my basses sound very good anyway. Previous Problems: While using the Joe Passive bass and the JDI (also a passive unit) out of the WWU DI-OUT, the signal was pretty weak. Because of this I have been just running straight into the JDI and using the "thru" to provide my signal to the WWU input. It works very good that way, but hard to switch instruments. **I have tried to use two basses but the sound man has to turn down the channel on the board or I get a loud pop to the PA mains while unplugging the cord to JDI. Plus I would either have to re-eq the amp or transfer the patch from the thru output of the JDI to the other already eq'd second WWU channel. Also, changing instruments from active to passive, the soundman would again have to adjust the channel gain/trim to the output of the bass. Not a pleasent thing in my band since the Drummer usually runs the sound and it takes too much time. Theory: If I did run the JDI out of the of the WWU DI-OUT and use both instrument plugged in each channel and pre-eq'd than no adjustment would have to be made, just turn down the bass and channel gain on the WWU to be safe. ** BUT, if the passive bass does not react as well with the passive DI; as perscribed as a possibility by our good friend KingOAmps in a previous thread; do to the output impedance of the pickups (active vs. passive) then I would be asking the soundman again to adjust the gain/trim on the board channel.... yikes. I've thought of AB boxes but adjustsments would still have to be made. Below is the information from the old thread from KingOAmps. Makes sense to me... quoted: Well I had quite the interesting experience with this myself. And that's one of the reasons that that little part from your earlier post about "double-DI'ing" caught my eye. That and the Radial JDI part. The JDI is a passive box, right? The JDV is active. Well I'm not qualified to go into all the technical munjibungo (I mean mumbojumbo ) but I believe that the input impedence of the box lies at the heart of the matter. Like me, you play a passive bass and I'm told that passive p/u's are higher impedence vs, say active p/u's. Well the input impedence of the box needs to be high also so as not to "load down" the signal. Check the input impedence specs on the JDI and the JDV. I think there's a significant difference. Many music store "salesman" like to think "passive bass, passive box" because it sounds logical, nice, and easy. I don't think it works to well in the real world however. Though I do not own any, I've witnessed active basses working quite well with passive boxes. I believe this is due to the much lower impedence of the active p/u's. They don't need to have the higher input impedence of the active boxes cuz they're already lower. I believe also that this is why we sometimes hear people say, "I just plugged the bass straight into the board" when talking about some active basses and not even having a DI meaning the bass's output is already well-matched to the board's input. Borrow a Countryman or another quality active DI and see if that works for you like it did me. I think your signal is being killed by the passive box.