Boss SP-1 Spectrum


  • Balance
    Mixes the clean signal with the filtered signal (?)
  • Spectrum
    Selects the filter frequency.


This effect is like a fixed wah, a static filter.


1977 - SP-1 Spectrum

The BOSS SP-1 Spectrum was an effect that boosted a select band of frequencies, so that instruments with a tendency to be "muddy"-such as electric bass-could be brought out in the mix. But the SP-1 also proved to be very popular among keyboard players, who paired it up with electric pianos such as the Fender® Rhodes.

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  • Spectrum
    500Hz - 5KHz continuous
  • S/N Ratio
    Over 80dB
  • Input impedance
    220K Ohms
  • Output load impedance
    Over 600 Ohms
  • Dimensions
    70(W) x 55(H) x 125(D)mm
  • Weight
  • Current draw
    DC9V, 3.5mA


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fx pedal stompbox stomp box guitar effects pedal bandpass bp bpf band-pass filter filter eq/excite/filter
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