{"id":14,"date":"2025-08-03T09:01:31","date_gmt":"2025-08-03T09:01:31","guid":{"rendered":"https:\/\/www.bosszone.info\/?page_id=14"},"modified":"2025-08-26T14:22:36","modified_gmt":"2025-08-26T22:22:36","slug":"sp-1-spectrum","status":"publish","type":"page","link":"https:\/\/www.bosszone.info\/?page_id=14","title":{"rendered":"SP-1 Spectrum"},"content":{"rendered":"\n
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The SP-1 is a single-band parametric equalizer. The “Spectrum” knob sets the center frequency in a range from 500Hz to 5kHz. The “Balance” knob sets the amount to boost that frequency. The SP-1 was less popular with guitar players than it was with keyboard players, who used it to accentuate particular harmonic elements of electric pianos like the Fender Rhodes. <\/p>\n<\/blockquote>\n<\/div><\/div>\n\n\n\n

The SP-1 was released at the same time as the OD-1<\/a> and PH-1<\/a>, forming the trio of pedals later referred to as the “traffic light” series. While the OD-1 and PH-1 sold well and spawned decades-long product lines, the SP-1 did not and was discontinued after a 3-year run. For this reason, it is one of the rarest BOSS compact pedals and prices on the used market remain high.<\/p>\n\n\n\n

The SP-1 has no direct successor; a decade would pass before the introduction of the PQ-3B and PQ-4, and neither of these models lasted to the end of the 1990s. Presumably, guitarists favored the intuitive control of graphic equalizers like the GE-6 and GE-7, the latter of which is one of the longest-lived models of BOSS compact pedal.<\/p>\n\n\n\n

Version Differences<\/p>\n\n\n\n

The first models featured the clear plastic “skeleton” switch, a momentary “Check” LED, and a silver thumb screw. In subsequent production batches the switch was changed to black, the LED was changed to the familiar latching mode, and the screw was changed to black.<\/p>\n\n\n\n

In 2017, the SP-1, along with the OD-1<\/a> and PH-1<\/a>, was reissued as part of the 40th Anniversary Box set.<\/p>\n\n\n\n

Specifications<\/p>\n\n\n\n