Maxon CS-9 Stereo Chorus Pro

A "Pro" Evolution in the Spirit of Vintage Japanese Choruses

The CS-9 Pro Stereo follows in the footsteps of classic analog choruses from the golden era, with a more comprehensive approach than a "two-knob" chorus. In this Pro version, Maxon adds a Blend control (mix), a dedicated Delay Time, and a stereo output, broadening the palette beyond the classic chorus: wide pads, micro-detunings, and hybrid zones flirting with more pronounced vibrato sensations.

Who It's For and What For: Studio, Live, and Stereo Pedalboard

The Maxon CS-9 Pro Stereo is aimed at guitarists seeking a high-end analog chorus : from detailed clean tones in pop, funk, and new wave styles to broader textures for rock, post-rock, and ambient. In the studio, it is particularly interesting for widening a mono track and placing the guitar in the mix without overpowering it. Live, its stereo outputs allow filling the space with a very immersive sound, especially when using two amps or a stereo input on a PA system.

Controls and Design: Straight to the Sound, No Menus

The CS-9 Pro Stereo emphasizes immediate ergonomics with four controls: Speed (modulation rate), Width (depth), Delay Time, and Blend (mix of dry and modulated signals). The key point is the Delay Time : adjusting this parameter changes the sense of "width" and the behavior of the detune, with this inverse relationship (the longer the delay, the lower the detune frequency) that makes the chorus very lively. For pedalboard integration, the true bypass prevents coloring your tone when the effect is off, and the stereo opens wiring options (mono, stereo, or more pronounced imaging effects depending on the setup).

Sound Character

The chorus is bright and airy, with a real sense of definition in the high frequencies, while retaining the warmth typical of an analog circuit. With a moderate Blend, the CS-9 Pro Stereo stays discreet: it thickens chords and adds movement to arpeggios without turning your sound into a permanent "wash." Pushing Width and exploring Delay Time, the modulation becomes more intense, with very expressive vibrato and doubling effects, responsive to playing dynamics and placement in the signal chain (before or after distortion, depending on the desired effect). Guitarists associated with this type of chorus include Dimebag Darrell, Bruce Kulick, and Mike Sullivan, which speaks volumes about its ability to cover styles from heavy rock to more modern textures.

Technical specifications

Effects	Chorus	Type	sector
Technology	Analog	Use	electric guitar
Format	Pedal	Color	Purple

Controls	Speed, Width, Delay Time, Blend	Battery operation	yes
Speed range	0.4 Hz to 8 Hz	Power connector	DC 2.1 mm
Delay time	0.9 mSec to 6.4 mSec	Polarity	center-negative
Bypass	true bypass	Dimensions	74 x 124 x 54 mm
Input	1 x 6.35 mm jack (mono)	Weight	580 g
Outputs	2 x 6.35 mm jacks (stereo)	Power adapter	no
Input impedance	500 kOhms	Documentation	yes
Output impedance	10 kOhms	Power consumption	26 mA
Power supply	9V DC	Required voltage	9V DC