Teemi

I do realize this has been asked a year ago, but many HX FX owners will hit this page and have the same question... When you want to combine more than 2 outputs from the power supply, it gets a bit complicated with chaining several current doubler adapters, and you are adding extra connections that can fail. You might be also paying for something you can get cheaper: a current doubler cable is actually just a 3 jack daisy chain. If you want to combine e.g. 4 x 300 mA to get 1200 mA, use a 5 jack daisy chain cable: connect 4 of the cable jacks to the sockets of the power supply, and 1 to the HX FX. It's a better solution as you have less connectors than in a current doubler doubling 2 current doublers, and usually it costs way less than 3 x current doubling cable. Using a daisy chain cable for multiplying current works equally well for all power supplies that are fully isolated (separate grounds) or just regulated (common ground). If you have too many jacks in the daisy chain, you can cut the excess off and carefully isolate both + and - with electric tape and wrap it up with e.g. heat shrink to avoid short circuit. The cut off cable is still a daisy chain (or current doubler/multiplier), if it has at least 3 jacks left, but take care of the cut ends not shorting on that cable, too. (The easiest mistake is to cut the excess cable off right at the jack, and you end up with stumps too short to protect.) NOTE: You should be aware that some daisy chains don't have ground connected to all jacks, to prevent ground loops. This feature will prevent the daisy chain from working as a current multiplier in most situations, too.

Set up the HX Effects just like in 4CM, but use both Sends and Returns (one for each pre-amp), and connect the HX Effect's main outputs to each amps Return. If you want to use the pre-amps in parallel, just insert a stereo FX Loop block. If you want to alternate which pre-amp to use, add two mono S/R blocks, both FX Loop 1 block and FX Loop 2 block. Set one of them on and the other bypassed. Then assign them to same switch. Now you can toggle between the two pre-amps. For a more complex setup where you want to add separate effects in front of each pre-amp, you should split the signal, add two mono S/R blocks to each path. If you make the split A/B, you'll be able to assign a switch to select which pre-amp is in use. If you make the split Y, and assign an expression pedal to control the A level and B level of the paths, and you'll be able to smoothly mix between the pre-amp outputs. (See Configuring Split Block Options p 31 for more ideas.) Adding separate send and return blocks gives you even more flexibility, but they also add complexity. The FX Loop blocks are way easier to understand.