Hello John, on opening my J Deluxe I was astounded by the evident quality.  They really are very well made.  They do you credit… Post installation I collected my Fender MIM 5 string Jazz Bass this afternoon from Manson Guitars, Exeter. Wow, what an improvement. When I got it home, I plugged it into my amp and could hardly believe the tones that I heard when in “active” mode.  The bottom end can be set to “growl” or whisper, while the higher registers cut through as clean as I have ever heard.  I am truly astounded by the improvement.  It is as different as chalk and cheese.  The passive mode has its own limitations by comparison, but is a useful supplement. Once again, thank you for your help and excellent product. Best regards.