Maxon CS-550 Stereo Chorus Pro

An "old school" analog chorus in the spirit of classic references

The CS-550 follows the tradition of analog choruses that defined the clean and crunch sounds of the '80s and '90s, with a wide and musical modulation that "thickens" the instrument without drowning it. Its BBD architecture and very "pedalboard-friendly" approach clearly place it among high-end vintage choruses, designed to preserve definition, dynamics, and a real sense of movement, especially in stereo configuration.

Who is the CS-550 for, and in which styles does it make a difference?

The Maxon CS-550 is aimed at guitarists (and bassists) seeking an expressive and warm chorus that's easy to integrate daily: from careful amateur musicians to live professionals. It excels in pop, funk, blues, rock, and shoegaze, becoming formidable whenever you want a wider clean tone, a more "3D" arpeggio, or a lead that breathes.

In mono, it adds body and a flattering subtle analog "shimmer." In stereo, it transforms a simple rig (or studio take) into a lively panorama, perfect for intros, open rhythms, and ambient textures, while remaining clear in a mix.

Settings, controls, and connectivity: simple, precise, effective

The CS-550 goes straight to the point with controls designed to cover a wide range of situations without hassle. The Speed and Depth pair adjusts the modulation rate and depth: slow and subtle for natural thickening, or faster and deeper for a more pronounced modulation. The D-Time (Delay Time) control adjusts the sense of "width" and can even flirt with more edgy textures when set short, bordering on flanger-like effects. Finally, the Mix (M-Level) is key: it finely balances the effect with your dry signal to preserve the attack and presence of your playing.

The pedal features an instrument input and two outputs : you can use a single output for mono connection, or both outputs for stereo spread (two amps, two mixer channels, or audio interface inputs). A Normal / Effect switch allows toggling between dry and effected sound.

Sound Character

The Maxon CS-550 stands out with a dense and velvety analog tone : the high end remains smooth, the low end holds firm, and the whole breathes with a very "organic" movement. It doesn't just add modulation; it provides thickness and depth that enhance both open chords and melodic lines.

Its response is particularly pleasing on slightly overdriven sounds: the modulation stays clear and avoids the "metallic" effect that some digital choruses can emphasize. Thanks to the Mix control, you can go from an almost imperceptible chorus (just enough to widen the sound) to a more marked, enveloping effect, ideal for dreamy atmospheres.

Technical specifications

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

BBD circuits	Panasonic MN3207	Residual noise	-100 dB
Controls	D-Time (Delay Time), Depth, Speed, M-Level (Mix)	Delay time	0.8 ms to 6.3 ms
Switch	Normal / Effect	LFO speed	0.4 Hz to 8 Hz
Input	1 x 6.35mm Jack (Input)	Dimensions	117 mm (W) x 150 mm (D) x 60 mm (H)
Outputs	2 x 6.35mm Jack (Output A / Output B)	Weight	500 g
Input impedance	500 kOhms	Required voltage	10V DC (via special AC adapter)
Output impedance	10 kOhms or less	Consumption	21 mA
Maximum output level	+5 dB