Fig. 1<\/strong> shows an arrangement of two north poles up (with white covers), at the neck (N) and bridge (B) positions, and two south poles up (with the black covers), at the middle 1 (M1) and middle 2 (M2) positions.\u00a0 There are two scales on each side of the pickups, corresponding to the extension of the fret positions.\u00a0 The neck has 23 frets, and the neck pickup (N) is set at the virtual 24th fret position.\u00a0 Double dots show the next positions 12 frets closer to the bridge.<\/p>\n In this patent-pending system, the pickups rest on springs and sliding mounts under the scales, which are fixed to the underside of the body in a set of mounting holes in the body.\u00a0 This allows each pickup to rise toward the strings and fall at each end, move towards the neck or bridge at each end, and slide sideways across the strings \u2013 five degrees of freedom.<\/p>\n This N-S-S-N arrangement produces four in-phase pair connections (serial or parallel), (N,M1), (N,M2), (M1,B) and (M2,B).\u00a0 The outputs tend to be warmer when the pair is closer to the neck or farther apart, and brighter when the pair is closer to the bridge and closer together.\u00a0 So the factors making (N,M1) and (N,M2) sound different might tend to cancel.\u00a0 But the same factors should make (M1,B) and (M2,B) sound more different.<\/p>\n Note that the average position of the counter-phase pairs, (N,B) and (M1,M2) are virtually the same.\u00a0 So the wider spacing of (N,B) should make it warmer.\u00a0 If a 6P6T selection switch is to be wired to go from warmer to brighter, all of these factors come into play, and should be verified either by ear or frequency analysis.<\/p>\n Fig. 2<\/strong> shows a setup with just one S and 3 N pickups.\u00a0 Note that there are now 3 in-phase humbucking pairs and 3 contra-phase humbucking pairs.\u00a0 That ratio would be same if there were one N and 3 S pickups.\u00a0 The (N,M1) pair should have a warmer tone than the (M1,M2) pair and (M1,B) pair.\u00a0 But without testing, it might be hard to decide whether (M1,M2) or (M1,B) is warmer.\u00a0 Clearly the contra-phase pair (M2,B) is the brightest, but without testing, it might be hard to tell which of (N,B) or (N,M2) has the warmer contra-phase tone.<\/p>\n Fig. 3<\/strong> shows a setup with all N poles up, which forces all 6 outputs to be contra-phase.\u00a0 Clearly (M2,B) is brighter than (M1,M2), which is brighter than (N,M1), and (M1,B) is brighter than (N,M2), and (N,B) is the warmest of all.\u00a0 But whether (N,M1) is warmer than (N,M2), and whether (M1,M2) is warmer than (M1, B), must be determined.<\/p>\n Fig. 4<\/strong> shows the second figure of Clarence L. Fender\u2019s patent US3290424, which was marketed as the Fender Marauder, of which few models were sold.\u00a0 In this figure, the black overlays indicate the pickups with south poles up.\u00a0 Since there are 2 N and 2 S, this can produce a total of 4 in-phase humbucking pairs and 2 contra-phase humbucking pairs.\u00a0 But the patent does not mention humbucking at all, referring only to the configuration of fields.<\/p>\n Fig. 5<\/strong> shows the sixth figure in Fender\u2019s patent, the switching diagram.\u00a0 Note that each pickup connects to the other in parallel with a 2P3T switch, allowing the one to four coils to be connected together, either in phase or out of phase.\u00a0 This means 4 non-humbucking singles, where the two of the 2P3T working connections would have little or no tonal difference.\u00a0 Each pair can be connected together either humbucking or not humbucking, for 12 unique tonal combinations, or (2*(4*3)\/(2*1)), 6 of which are humbucking.\u00a0 But the switches allow each pair to be connected together in 2 humbucking and 2 non-humbucking switch positions, for 12 humbucking switch positions, of which \u00bd sound like the other half.\u00a0 Remember that number, 12.<\/p>\n No matter how the triples are connected together, they can\u2019t be humbucking, because at least one pickup with defeat it.\u00a0 There are (4*3*2)\/(3*2*1) or 4 unique triplings, in which each pickup in each tripling can be switched in two different ways (and here I may mess up the math, but non-humbucking sets don\u2019t count for much here), for 2^3 = 8 unique binary combinations, and 24 different triple connections.<\/p>\n There can be only one quadrupal connection, with 2^4 = 16 different switch positions.\u00a0 Consider the quad to consist of two pairs with the potential of being humbucking.\u00a0 They can be both (N&S) pairs, or the (N&N) and (S&S) pairs.\u00a0 That\u2019s two different way to make a quad.\u00a0 In each pair, there are 2^2 = 4 switch positions, of which only 2 are humbucking, and those two humbucking switch positions sound the same.\u00a0 So, 2 pairs with 2 humbucking switch positions, and 2 more pairs with 2 humbucking switch positions, for a total of 2*2+2*2 = 8 humbucking switch positions.\u00a0 Which all sound the same, since it amounts to two parallel humbucking pairs connected in parallel.\u00a0 Remember that number, 8.<\/p>\n One source claimed that the Marauder failed because of persistent hum. This analysis shows why, a total of 12+8 = 20 humbucking combinations (some of which sound the same) out of 3^4-1(all open) = 80 possible switch positions. And 6+7 = 13 of those humbucking positions would sound like the rest, leaving only 7 unique humbucking arrangements.\u00a0 It would have been very hard for a guitarist to find those 20 good (7 unique) humbucking positions without a map, which the patent did not provide.<\/p>\n The patent-pending switching system in US 2016\/0027422 A1 has an advantage \u2013 you don\u2019t have to guess or have a map.\u00a0 It is very technical, and still needs a lot of experimentation to get the best outputs that the guitarist wants to hear.\u00a0\u00a0 But with the proper switch wiring, you can mount any pickup and pole combination in any position and orientation to get a huge range of possible tonal combinations.<\/p>\n For future reference and study, the last figure, labeled Fig. 17<\/strong>, from a previous Provisional Patent Application version, shows equations for placing four pickups in a N, S, S, N configuration, at positions YA, YB, YC, and YD between the neck and bridge, to get pair midpoints y1, y2, y3, y4.\u00a0 It assumes that one wishes to put the midpoints of each humbucking pair at certain virtual fret positions, determined by integers (or near integers) a<\/strong> and b<\/strong>.\u00a0 Hence the use of the common fret ratio R = 17\/18, or more properly 2^(-1\/12).<\/p>\n This may or may not prove useful; it will take a lot of experimentation to demonstrate it one way or the other.\u00a0 Further, the optimized spreadsheet back-solutions for the pickup positions, YB, YC and YC, with YA scaled to 1, do not typically produce clean integers for a<\/strong> and b<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":" Or Why the Fender Marauder ™ Failed Suppose you have four matched single-coil pickups, any one of which can be either magnetic poles north-up (N) or south-up (S).\u00a0 What kind of humbucking pair connections can you get? Remember that if … Continue reading ![\"2014-04-06](\"http:\/\/android-originals.com\/tulsasound\/wp-content\/uploads\/2016\/06\/2014-04-06-2N-2S-pairs-800.png\")
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