I've been researching the whole Speaker Impulse response method lately, and I know you can use an amp head's line out (or slave out). So my question is (and I'm assuming this is the case) if I need a DI box to successfully record the slave out from my Dual Rectifier head. It's really noisy right now, and I'm not referring to the inherently thin fizzy tone you get from a slave out. I'm just wondering if a DI is all I need to solve this issue. Thanks