CM Acoustic
- 300 watts of clean headroom.
- Two fully independent channels.
- Two custom-designed SU65147CM full-range drivers.
- Developed and assembled in Denmark.
All about Carl Martin CM Acoustic
We built CM Acoustic with a clear objective: to create an acoustic amplifier that delivers controlled, full-range amplification while preserving the natural character of the instrument.
It is a 300-watt system built around two custom-designed SU65147CM 6.5 inch full-range drivers, developed and assembled in Denmark. Rather than reshaping the sound, CM Acoustic is engineered to reproduce it accurately. The amplifier maintains transient integrity, preserves harmonic separation, and retains low-end definition without artificial compression or exaggerated coloration.
Responsiveness is central to the design. An acoustic amplifier should not impose a signature; it should follow the player. When you play lightly, the system remains open and articulate. When you increase attack, the amplifier reacts immediately to the transient without adding edge or flattening the response. The initial pick impact stays defined, the body resonance remains stable, and the midrange does not collapse under dynamic pressure. Harmonics stay separated instead of smearing together as volume rises. The circuit tracks changes in touch with precision, remaining composed at higher output levels and controlled without becoming sterile.
The speaker system plays a critical role in that behavior. The SU65147CM drivers are specified for predictable electrical load, stable sensitivity, and controlled excursion. With natural resonance around 100 Hz, the cabinet delivers a tight and supportive low end without uncontrolled bloom. The ferrite motor structure maintains cone control under dynamic load, and the linear excursion range ensures the system remains stable when pushed. The result is a balanced projection that feels closer to a compact full-range monitoring system than a traditional acoustic combo, but without losing the immediacy of a dedicated instrument amplifier.
CM Acoustic features two fully independent channels designed for transparent signal handling. The instrument channel provides gain, a 3-band EQ with sweepable midrange from 220 Hz to 5.1 kHz, limiter, EQ bypass, reverb and volume. The microphone channel includes balanced XLR input with +48V phantom power, limiter and overload indication. CM Acoustic is engineered primarily for acoustic guitar, yet reproduces vocals and additional instruments with the same transparency. Each channel behaves consistently whether used independently or together, allowing precise level balancing without unintended tonal interaction.
For live environments, the amplifier integrates practical control features without complicating operation. The limiter manages peak dynamics, the phase switch assists in feedback control, EQ bypass provides direct reference comparison, and reverb can be muted via external footswitch. The balanced XLR DI output mirrors the amplifier signal path, ensuring consistent translation to front-of-house or recording systems.
The cabinet is mechanically reinforced with solid wood side panels, contributing structural stability and controlled resonance behavior. The enclosure volume is optimized for the specified drivers, ensuring predictable acoustic loading. The design remains refined and understated, suitable for professional environments while fitting naturally into a home setting.
CM Acoustic is designed, tested and assembled in Denmark. Component selection prioritizes signal integrity, stability and long-term reliability. We build what we would trust on stage and what we would choose to live with every day.
FAQ
Quick answers about this pedal — shipping, power, use-cases and more.
What kind of amplifier is CM Acoustic?
CM Acoustic is a 300-watt full-range acoustic amplifier built around two custom SU65147CM 6.5” full-range drivers developed and assembled in Denmark. It is designed to reproduce the natural character of acoustic instruments without imposing coloration. Rather than enhancing lows or hyping high frequencies, it focuses on transient integrity, harmonic separation, and dynamic responsiveness.
Is CM Acoustic voiced like a traditional acoustic combo?
Not in the conventional sense. Many acoustic amps intentionally shape the sound with boosted highs or softened mids. CM Acoustic is engineered to behave closer to a compact full-range monitoring system — but with the immediacy and feel of a dedicated instrument amplifier. The goal is controlled projection and transparency, not coloration.
How does the amplifier handle dynamics?
Responsiveness is central to the design. When played softly, the system remains open and articulate. When pushed harder, it tracks transient attack without flattening the response or exaggerating harshness. Harmonics remain separated rather than collapsing under dynamic pressure. The internal headroom and limiter design ensure stability even at higher output levels.
What makes the SU65147CM speakers special?
The SU65147CM drivers are specified for predictable electrical load, controlled excursion, and stable sensitivity. With a natural resonance around 100 Hz, they provide a tight low end without uncontrolled bloom. The ferrite motor structure maintains cone control under load, contributing to balanced projection and stable low-frequency behavior.
What about the microphone channel?
The mic channel includes a balanced XLR input with +48V phantom power, a limiter, and overload indication. It is designed to reproduce vocals transparently and without tonal interaction with the instrument channel.
Can both channels be used simultaneously?
Yes. The channels are fully independent and designed to behave consistently whether used alone or together. Level balancing remains predictable without unintended tonal interaction.
How does CM Acoustic handle feedback control?
It includes a phase switch to help reduce low-frequency feedback. The sweepable midrange EQ allows precise control over problematic frequencies. The limiter also helps manage transient spikes that may trigger feedback.
Does the DI output reflect the full signal path?
Yes. The balanced XLR DI mirrors the amplifier’s signal path, ensuring what you hear on stage translates consistently to front-of-house or recording systems.
Is it suitable for home use as well as live performance?
Yes. While engineered for stage reliability, the cabinet design and controlled projection make it equally suitable for home environments without sounding oversized or overly aggressive.