Hello, I have the same idea - put in H4 and H4A. Even so they have similar parameters (orig. jtv and emg) EMG has a little bit higher values. For example DC rezistance. If you have both in the guitar, do you hear a difference? In the lowest tuning for example.. Something bad vs. original?....In tone by any playing techniques...whatever? If you should make a comparison? Some people say the jtv-89f it´s perfect but has problem when they does the palm-muting. Did you have the same problem too? What after exchanging for emg? Thank you! Or anyone if you can comment... Do you think this is a good idea?