Has anyone tried replacing their EMG HZ or EMG SSD pickups with active EMGs? If so what do you think of the results? Has anyone replaced the EMG SSD pickups with the active EMGs in their Spector bass and wired them to the Tonepump Jnr preamp? Is it worth going the whole way and replacing the Tonepump Jnr with the EMG accessory circuits such as the BTC or BTS? Thanks for any advice.