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Ultrasound CP100 100W 1x8 Compact Acoustic Combo Amp   (Open Box)
Ships Internationally
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Product# H76827

The UltraSound CP-100 is a compact, powerful 2-channel amp that keeps your amplified acoustic guitar sounding acoustic. It has an 8" LF driver and HF horn powered by 100W. 2 channels each have combo XLR/1/4" inputs so they can be used for either guitar or microphone, and the inputs also have phantom power for condenser mics. Each channel has 2-band EQ, and channel 2 has a notch filter for eliminating feedback, as well as a shape switch that scoops the mids. A bank of 16 digital footswitchable effects (reverbs, delays, flanges, choruses, auto wah, and rotary) can be assigned to either or both channels. Other features of the Ultrasound CP-100 include effects send/return, an unbalanced line out for connection to a mixer or slave amp, and a balanced DI output for connection to a recorder or sound reinforcement system.

"The CP-100's high headroom and ability to handle attack transients without compressing the sound or getting distorted easily allows you to dig in and express yourself. Whether you pick with skin or nail, play Doc Watson-smooth lead lines or snap the strings with Mississippi Delta force, the CP-100 will transmit everything with the faithfulness of a Steinway grand piano soundboard." - Emile Menasche (Guitar World Acoustic magazine)

Wonderfully transparent, natural acoustic tone with plenty of connectivity and performance options for solo singer-guitarists.

  • 100W
  • 8" driver with HF horn
  • 2 channels
  • Combo XLR/1/4" inputs with phantom power on both channels
  • Bass and treble tone controls on both channels
  • 18dB cut, sweepable notch filter on channel 2
  • Shape switch (mid scoop) on channel 2
  • 16 digital effects assignable to either or both channels
  • Effects include reverb, auto wah, delay, flange, chorus, and rotary speaker simulation
  • Send/return for external effects
  • Unbalanced line out
  • Balanced direct out
  • RCA input for tape or CD player
  • Footswitch input for effects on/off
  • Vintage-style leather handle

Amplify your acoustic guitar with all its richness and character. Order today.


CP100 100W 1x8 Compact Acoustic Combo Amp

  • 16"W x 12"H x 11"D
  • 30 lbs.
  • INPUT-1: This combo input is designed for both MIC level (XLR) or Instrument level (¼") signals. (The XLR input provides phantom power)
  • VOLUME: Controls the overall volume level of CHANNEL-1.
  • BASS: Adjusts the amount of cut or boost in the low frequency range.
  • TREBLE: Adjusts the amount of cut or boost in the high frequency range.
  • Note: When CHANNEL-1 is not in use, be sure to turn all controls to the minimum level to avoid any unwanted noise being passed through the amplifier.
  • INPUT-2: Combo Input designed for both MIC level (XLR) and Instrument level (¼") signals. (The XLR input provides phantom power)
  • VOLUME: Controls the overall volume of CHANNEL-2.
  • BASS: Adjusts the amount of cut or boost in the low frequency range.
  • TREBLE: Adjusts the amount of cut or boost in the high frequency range.Notch Filter HZ: Sets the frequency of the 18db cut NOTCH FILTER that is used to control resonant feedback.
  • Notch Filter: ON/OFF - Enables or disables the notch filter control.
  • Shape: ON/OFF This toggle switch enables or disables the SHAPE control. The shape control is a mid dip control. In the on position the mid frequencies will be cut and the high and low frequencies will be boosted.
  • Effects Assign: This 3 way toggle switch allows the digital effects to be routed to CH-1, CH-2, or if in the middle position will supply effect for both channels.
  • Effects LEVEL: Controls the amount of digital effect mixed in to the guitar signal from 0% to 50%.
  • Effects MODE: This is a rotary encoder, which selects 1 of 16 different digital effects. See Digital Effects Program List.
  • MASTER VOLUME: Adjusts the overall loudness of the amplifier.
  • Pilot Light/Limit Indicator : When GREEN, this LED indicates that the power is turned on. If the power amplifier reaches full power output, the on board Limiter will be enabled and this LED will turn RED. The Limiter allows the amplifier to be played at full power without unwanted distortion.
  • CP-100 Back Panel
  • EFX F.S. (FOOTSWITCH): This jack is for connection to a shorting footswitch. When the switch is closed the on board digital EFX will be bypassed.
  • EFX SEND: This jack provides an unbalanced output from the CHANNEL-2 preamp, it does not include effects or tone control signal.
  • EFX RETURN: This jack provides a signal pre-eq. It automatically disconnects the CHANNEL-2 preamp when used.
  • LINE OUT: This jack provides an unbalanced out put from the preamp that is post eq and post efx. This send can be used to feed a signal to a recording or sound reinforcement mixer. Additionally this output can be used to drive a slave amp such as the ULTRASOUND AG-50E.
  • DIRECT OUT: Balanced output signal, post eq and post efx, used to feed recording or sound reinforcement equipment.
  • TAPE/CD: Unbalanced phono (RCA) input jacks. This is an auxiliary input designed for use with a drum machine, tape player, CD player, etc. and can be used for playing prerecorded music.
  • TAPE/CD LEVEL: This "inset" control adjusts the volume level of the TAPE/CD input. This control can be adjusted with a small screwdriver. This signal is pre MASTER control which means that the MASTER volume setting will affect the loudness of the TAPE/CD input signal.

Review Snapshot®

by PowerReviews
UltrasoundCP100 100W 1x8 Compact Acoustic Combo Amp

(based on 2 reviews)

Ratings Distribution

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Reviewed by 2 customers

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Good Amp but Poor Service


from Montreal

About Me Experienced


  • Excellent Sound
  • Portable


    Best Uses

      Comments about Ultrasound CP100 100W 1x8 Compact Acoustic Combo Amp:

      Solid amp. However, when I needed a replacement part, Ultrasound would neither sell it directly to me, or refer me to a supplier. They didn't even acknowledge a follow up email I had sent them. Not impressed.

      Comment on this review

      (4 of 4 customers found this review helpful)


      Great compact acoustic guitar amp, so-so vocal.


      from Undisclosed

      Comments about Ultrasound CP100 100W 1x8 Compact Acoustic Combo Amp:

      The acoustic guitar tone produced by the Ultrasound line of amps is the best I've heard for the price range. This amp is very small for its wattage. Its weight lets you know it's got more than meets the eye, yet it's still not so heavy it's uncomfortable to lift. The idea of having a separate vocal channel is a great one, but the vocal sound quality isn't nearly as nice as the guitar sound quality. Plus, although there are separate tome controls for the two channels, there aren't separate level controls for the effects.

      This is an upgrade for me from the Ultrasound 30-watt model, which I really liked, except that it had no reverb. I wanted a louder guitar amp (with reverb) more than I was worried about getting good vocal quality, so overall I'm real satisfied with the amp. It does a great job with my Ovation.

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