CompIQ STELLA Pro Compressor Pedal for Bass & Guitar
279,00 € – 349,00 €
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Build to order, 5-7 workdays
The CompIQ Stella Pro MK2 stands out as a remarkably powerful compressor/limiter pedal, offering a wide array of parameters for unprecedented control over playing dynamics. The Stella proves versatile for studio applications like bus compression and tracking and delivers outstanding results in live performances. It can be utilized with any instrument, such as guitar, bass, keyboards, synths, electro-acoustic guitars, etc., and even with vocals, with an additional microphone pre-amp.
The optional DITOS Transformer-Coupled Balanced Output DI is available as an add-on board. Built with Burr-Brown™ technology and highly advanced line drivers, the DITOS provides complementary signal conditioning and a warm musical voicing to any instrument.
This incredibly full-featured comp offers all the controls a rackmount unit offers, but in a pedal format.
Even if you apply a lot of compression, the amount of sound information does not decrease. There is no noise and the build quality is high.
An incredible amount of high-quality dynamic control. The answer to the prayers of any bassist wanting a studio-quality control on stage.
The Stella is, essentially, a studio VCA compressor in a pedal. It can sound wonderfully transparent, or full of character, and there’s oodles of control at your fingertips.
I’m not aware of any compressor on the market that packs this much punch in terms of functionality. In many ways the Stella has raised the bar for compressor pedals.
Compared to my various previous compressors, I am more immediately aware of the precision and high fidelity of this device.
It’s amazing how many options Becos FX has put in these boxes. It is hard to find real alternatives with so much flexibility in one device.
The CompIQ Stella has a ridiculous amount of power. Better still, it’s a transparent compressor that only colors the tone as much as you allow it.
Notes are thickened without thumping, and chords gel together in a way that makes you sound like a better player. This is a proper gem.
V2.0 | V1.4
Manual DITOS
Setting examples and sound demos
Video Demo
What people say
CompIQ 101
Compare compressors
Bringing Studio Compression Controls to Pedal Format
The CompIQ STELLA Pro MK2 is a feature-complete and powerful all-analog compressor/limiter pedal for use with guitar, bass, or any other instrument or audio source. It is also one of the very few that can be powered by an internal 9V battery or an external supply in the range of 9-18VDC. It is built around the high-performance 4320 THAT Analog Engine® which incorporates a true RMS-level detector that accurately measures the input signal and processes it through an ultra-transparent-sounding Blackmer® VCA. Unlike peak detection, commonly used in other compressors, the RMS (root mean square) sensor calculates an average peak level of the signal, aligning more closely with how human hearing perceives differences in loudness.
The pedal now offers two selectable compression modes. In Feed Forward mode, emphasis is on speed and accuracy, utilizing a pre-VCA copy of the input signal. This mode can provide subtle compression up to brick-wall limiting based on control settings. The “old-school” Feed-Back compression delivers a smooth response suitable to transparently even out playing dynamics. This mode uses a post-VCA copy of the audio signal for its dynamic processing. While Feed-Back mode excels at low-to-medium compression ratios, it may be less suitable for using compression as an effect or hard peak-limiting. Nevertheless, by adjusting the threshold, employing a hard knee, selecting a higher ratio, setting a fast timing, and even boosting the control signal in the side chain filter, the Stella can function as a genuine Feed-Back limiter. In any settings, both modes sound clean and natural, without pumping, breathing, distortion or other artifacts.
The Stella MK2 features upgraded side-chain capabilities, including a variable Lo-cut/boost filter specifically designed for bass instruments (±12dB @ 90Hz, 12dB/octave). When high-amplitude low frequencies trigger the threshold early, the compressor may engage prematurely, potentially over-compressing high-frequency elements, particularly in specific applications. By cutting lows in the side-chain, compression in the lows at the output is reduced, restoring overall signal energy. Conversely, boosting lows in the side-chain increases compressor sensitivity, aiding with very low-level signals. Moreover, a matching variable Hi-cut/boost filter in the side-chain further refines this balance (±7dB @ 3kHz, 12dB/octave). The cutting side of the filter avoids overly compressing highs, preserving a natural brightness in the output. Conversely, boosting highs in the side-chain enhances compressor sensitivity to high frequencies, which helps with very bright sounding instruments. When both filters are set to cutting, the compressor becomes more sensitive to mid-frequencies within 1-2 kHz, resulting in increased compression in this range at the output. These enhancements effectively manage compression across lows, mids, and highs, delivering impactful dynamics without unwanted pumping and maintaining desired balance in the audio spectrum.
The Compression Knee feature provides two options, each with its particular sonic signature. Hard Knee compression is quick and snappy, suitable for peak limiting or enhancing the compression feel. Soft Knee compression is gradual and gentle, creating a transparent effect even at high ratios.
The X-EQ tilting equalization circuit, rooted in the Hi-Fi era of the 1970s, offers two pivot frequency options: High (at 1kHz) suitable for guitars, and Low (at 330Hz) which works better for bass. This post-compression gentle correction can compensate for differences between instruments or be employed to enhance the lows or highs of the instrument. Both settings can be used in either application, each bringing a different but useful and likable EQ result.
Additionally, the STELLA Pro MK2 features two internal DIP switches for voicing selection. These settings introduce nuanced shifts in the internal dynamic frequency processing, bringing subtle coloring to the sound. The Spark setting adds polished brilliance to the highs, Tight dips the low-mids slightly, providing more depth, and Punch brings a tube-like compression feel with velvety lows and warm highs (which complements even more the DITOS transformer voicing). We will leave the Punch setting activated by default so you can have some fun right away. However, if you want to maintain the most transparent sound response at the output, which always preserves the instrument’s natural character, you may turn the voicing off.
The Dynamic Auto Timing circuit offers user-friendly operation with two selectable options: Fast and Slower. These settings adapt to different playing styles. For added versatility, manual control over Attack and Release timings is available, unlocking a range of other compression possibilities. For instance, setting the compressor for slow attack and fast release allows initial transients to pass through at a higher audio level (set by the Make-up Gain), creating a tight and percussive sound suitable for guitar “chicken picking” or bass “slapping.”
The Stella also features a Dry/Wet Mix, which allows for blending a desired amount of clean signal with the processed signal, resulting in a more natural compression effect. Such a mixing technique (a.k.a. New York style) is usually employed when hard compression is set out as an effect or when limiting must be made more subtle.
An 8-LED gain reduction meter allows for accurate monitoring of the compression applied to the input signal. This feature provides useful visual feedback on the degree of sound processing.
DITOS • Transformer-Coupled Balanced/Unbalanced Output Board
The optional DITOS board featuring a transformer-coupled balanced output in 1/4″ TRS format is available for insertion in the space typically used for the 9V battery. This allows for direct recording or sending of the signal to a mixing console. It can also be utilized as an unbalanced floating output to send the signal to another pedal or amplifier, capturing the warmth of the output transformer. The main output is always functional and may be utilized for sending the signal to another processing chain or tuner.
When Stella is in bypass, the DITOS circuit still processes the signal, accounting for active compression bypass. However, the main output is true-bypassed.
Ground-lift jumpers are available internally to address any potential ground-loop noise issues.
The DITOS board is designed for easy interconnection with CompIQ Stella mainboards manufactured after September 2021 and is also compatible with the older board versions.
DITOS sound demos
Sound demos on bass
Audio examples graciously provided by jazz artist Jean-François Untrau from France, showcasing the alternating effect of the compressor in bypass and active modes. For specific details on the utilized settings, please refer to the Settings Examples tab located above.
Pristine audio processing
The CompIQ series of compressors preserves the unique tonal characteristics of the input signal. They provide pristine audio compression and offer a high dynamic range, which enables clean, natural-sounding tones with minimal noise and no artifacts or distortions in any settings.
Key features
- Full analog circuit with true by-pass
- True RMS-level detector for accurate input signal measurement
- High-performance Blackmer® VCA compression engine
- Optional DITOS board for transformer-coupled balanced output (10KΩ impedance)
- Feed Forward/Feed-back compression modes
- Ratio 1:1 to infinite:1 (limiter)
- Threshold -45dBu to +10dBu
- Make-up Gain -6dB to +20dB
- Soft/Hard compression knee selection
- Manual timing: attack 0.12-12 ms/dB of gain reduction, release 1.2-120 ms/dB of gain reduction
- Fast/Slower dynamic auto attack and release timing with hold for peaks over the threshold
- X-EQ with selectable frequency pivot 330Hz for bass instrument or 1KHz for guitar or other applications
- Voicing: Flat, Spark, Tight, Punch (internal DIP-switch selectable)
- Lows/Highs variable side-chain filter with boost & cut around 90Hz and 3kHz
- Dry/Wet mix
- 8-LEDs gain reduction meter
- High-end quality Burr-Brown FET audio ICs, low tolerance metal-film resistors, Panasonic, Kemet, Cornell Dubilier plastic film audio capacitors, Gold-plated multi-layers PCB, Gold-plated micro-switches
- Genuine Hammond black-powdered aluminum enclosure
- Runs on standard 9V internal battery or 9-18 V DC external power supply (not included), center negative, 12mm long barrel plug
- 3-year warranty (direct to manufacturer, international, transferable)
- Hand-assembled in Vienna, Austria
Note! Optimal configuration of the CompIQ Stella for studio recording or live performances typically necessitates a solid understanding of audio compression.
More info
V2.0 | V1.4
Manual DITOS
Setting examples & sound demos
Video Demo
Compare compressors
Box Weight | 0,33 kg |
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Box Dimensions | 13 × 8 × 5,5 cm |
Technical Specifications | Input impedance: 1.1MΩ |
Build Option | Without DITOS Trafo Output, With DITOS Trafo Output Installed |
Before you start
The CompIQ Stella is a full-featured compressor in pedal format which allows complex processing while preserving the dynamics of your playing. A good understanding of compression is normally required to optimally set it up for live performance or studio recording.
We advise testing the CompIQ Stella with an instrument amplifier instead of using headphones. Start by playing with it alone then integrate your settings along with your other pedals.
Here is the Stella Manual for your reference. For more in-depth technical info on our VCA line of compressors please take a look at the CompIQ 101 section. If you have particular questions regarding how Stella works, or you would like to share your feedback please contact us.
Stella sound demos on bass
Each demo has an associated image with pedal’s knobs & switches position used when recorded. A higher resolution image is displayed when loading the track on Soundcloud — along with details regarding the instrument, strings used for that phrase, and playing technique. Start by playing any track in the playlist below and click View Track to load it on Soundcloud for details.
The audio phrase is played twice in each track. First, the dry sound with the pedal in bypass, followed by a take with pedal engaged.
Many thanks to jazz artist Jean-François Untrau (France) who recorded these demonstrations.
Stella + DITOS sound demos on guitar
Back to Product PageBlog post: CompIQ Stella Settings Examples