Hi everyone! Read so much information on this board, but first post here... I've tried Googling and searching the forum, but didn't find any post fit in my situation... I also tried SD "Contact Us" but so far haven't got any feedback.
I have SPB-4 Steve Harris precision pickup and Apollo Jazz bridge pickup installed on a Fender American Deluxe P Bass together with Seymour Duncan STC-3P passive-voiced preamp/EQ, and did active/passive switch plus "tone after active" mod based on this: https://www.seymourduncan.com/blog/t...he-stc-preamps
As for pickup lead wiring, I used standard wiring diagram found on instruction paper (white => hot, black/bare => ground). Now I find in passive mode, when blend pot is in center detent, volume drops significantly. I estimated a 9 dB drop as my DAW channel meter goes from about -18 dB on either single pickup to about -27 dB when blend in center. However, in active mode this doesn't seem to be too much of a problem (only about 3 dB different in active mode).
Based on information I gathered over the Internet, it could possibly be an out-of-phase problem. But before I got the STC-3P preamp, I had the exact same SPB-4 and Apollo Jazz Bridge installed on a MIM Fender Deluxe Active Precision Bass with stock 3-band preamp and stock blend pot. Wiring was pretty much the same, but in either passive or active mode, I don't recall such significant volume drop.
Can someone help me diagnose if I am indeed having out-of-phase problem before I open up pickguard again to swap one of pickups' wires, or even buy another pickup for wiring pure passive (pickguard for this particular 11-hole p body is kind of hard to find...)? I thought neither SPB-4 or Apollo was split-coil as they only have two or three wires. And since they are both from Seymour Duncan, they should be working together fine... right?
Thanks in advance for any input!
I have SPB-4 Steve Harris precision pickup and Apollo Jazz bridge pickup installed on a Fender American Deluxe P Bass together with Seymour Duncan STC-3P passive-voiced preamp/EQ, and did active/passive switch plus "tone after active" mod based on this: https://www.seymourduncan.com/blog/t...he-stc-preamps
As for pickup lead wiring, I used standard wiring diagram found on instruction paper (white => hot, black/bare => ground). Now I find in passive mode, when blend pot is in center detent, volume drops significantly. I estimated a 9 dB drop as my DAW channel meter goes from about -18 dB on either single pickup to about -27 dB when blend in center. However, in active mode this doesn't seem to be too much of a problem (only about 3 dB different in active mode).
Based on information I gathered over the Internet, it could possibly be an out-of-phase problem. But before I got the STC-3P preamp, I had the exact same SPB-4 and Apollo Jazz Bridge installed on a MIM Fender Deluxe Active Precision Bass with stock 3-band preamp and stock blend pot. Wiring was pretty much the same, but in either passive or active mode, I don't recall such significant volume drop.
Can someone help me diagnose if I am indeed having out-of-phase problem before I open up pickguard again to swap one of pickups' wires, or even buy another pickup for wiring pure passive (pickguard for this particular 11-hole p body is kind of hard to find...)? I thought neither SPB-4 or Apollo was split-coil as they only have two or three wires. And since they are both from Seymour Duncan, they should be working together fine... right?
Thanks in advance for any input!
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