This thread started with onboard preamps that were typically addressed in the pup forum and it's kind of gravitated into the Twilight Zone - and it continues to do so. Regardless it's all about tone, which is inherently a pickup thing. The following units were included with bold print highlighted to identify the beginning of an experiment and ran in the order listed. Page 1 AGUILAR OBP-3 BARTOLINI NTMB EMG BQS BOSS GEB-7 YAMAHA NATHAN EAST NE-1 PARAMETRIC EQ DEGRATION OF SIGNAL AND COMPONENTS KORG PX4B MULTI EFFECTS PRECESSOR LINE 6 BASS POD ART MP TUBE MIC PREAMP Page 2 FENDER VICTOR BAILEY PREAMP SANS/MXR DI COMPARISON OUTBAORD SADOWSKY DI/PREAMP ALEMBIC ACTIVATOR PREAMP (mounted onboard and outboard) Presonus EQB3 ( 3 band parametric) This was an interesting clip I ran across written by a recording engineer. I condensed most of it simply to extract the meat. So if you ever wondered what frequencies you're playing for a given note, the following will give you an idea. Using an FTT analyzer, A '64 Fender Precision slap/popped to an open E produced frequencies ranging from 41.25Hz to 22KHz (22,000Hz). 41.25Hz is actually the lowest note on a 4 string bass to standard tune. The percentage of the fundamental open E to the 17th harmonic (700.4Hz - which is an F) was only 0.06%, which gives you an idea of how little was at 22KHz. However, quote: Fig.3 shows you why: a real instrument like the bass guitar already has large amounts of second harmonic present in its spectrum; adding a little more can hardly be expected to change the instrument's basic tonal quality. But because adding even small amounts of high-order harmonics changes the ratio of harmonics—hence the timbre of the instrument—by a relatively large amount, they will be more audible. It is the precise ratio of harmonics to the fundamental tone that give a specific instrument it's characteristic tone, the equivalent of a human fingerprint. Lastly: Equalization charts often identify frequencies that you may want to boost on the bass guitar as being 400 Hz, 800 Hz or 1.6 kHz. boosting one of these frequencies will often make the bass line more distinct and clear. You choose which frequency to use based on which one works most effectively in the particular mix you are doing. Notice any similarities with stats on these units?