As a compressor, the Bloom features an optical limiting circuit that takes its inspiration from compressors designed during the golden age of vacuum tube circuits. Optical compressors, as they are called, are known for their transparency and subtlety. While the Bloom can provide a very aggressive response at more extreme compression settings, its real strength lies in its ability to add a gentle sweetening and roundness to the tone as the optical circuit works to polish off any rough edges in the sound. Because of its natural and touch responsive bloom, the Bloom is ideal for players who typically don't use compression but want the 'mastered' response that optical compression gives a guitarist's tone.
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The frequency response of the compressor section is flat as a board and does not boost or cut any of your highs or lows. Just like a well-designed compressor should, the Bloom alters the dynamics of the guitar signal and not the tone. A good compressor should be felt and not heard.
Dual Compression - Aka Slide Mode:
During the design phase of the Bloom, Jackson consulted with slide master Joey Landreth, of The Brothers Landreth fame, on what an ideal compressor for guitarists as well as slide players would be. After going back and forth with him it soon became clear that to build the ultimate compressor for guitarists Jackson would have to include the option to run two compressors in series with each other to…
provide the legendary Lowell George slide tone. Lowell George, the bandleader/singer/songwriter/guitarist for the band Little Feat was famous for using two Urei 1176 compressors in series with each other to give his guitar near-infinite sustain while still remaining crystal clear.
When set to compression preset 5 or "Slide Mode" the aux compressor circuit is activated and placed in series ahead of the primary compressor. The tonal result of using two compressors in series is that notes will sustain almost endlessly and oftentimes break out into harmonic feedback while still remaining clear and clean! It 'feels' like you have an overdrive pedal on but the tone is still clean with endless sustain!
Hidden inside the Bloom, is an auxiliary compressor circuit that is identical to the main compressor circuit however without externally mounted controls. This aux compressor, which is set with a fast attack of 7.5ms, has two trimmers mounted on the right side of the pedal and are accessible when the cover is removed. These trimmers allow you to adjust the COMP and VOLUME settings of the aux compressor when using compression presets 5 and 6. More on compression presets later.
Clean Blend:When more subtlety is desired from the compression circuit, Jackson included a BLEND control that allows the player to blend in their clean, unaffected signal back in with the compressed signal. One of the best features of the Blend control is that it allows the player to dial in a really aggressive compression setting and then blend some of the clean signal back in with it. This produces the effect of giving the note a very natural attack while slowly fading in the sustain that comes from running a high compression setting.
Compression Presets:If you're not a studio engineer, many of the more fully-featured compressors on the market can be really intimidating and overwhelming with knobs for everything including attack, release, ratio, knee, etc. To keep things as simple as possible, the Bloom has six compression presets that give the player six distinct options for their attack and release settings.