aion LUMIN Instruction Manual - Page 5

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BUILD NOTES

Basic theory

The legendary "BBE process" is a textbook usage of something called a state variable filter. The signal is

split into three parts (low, medium and high) that can be controlled & modified separately before being

mixed back together. The idea is that it phase-corrects the frequencies before they are amplified and

sent to the speakers and this results in optimized speaker performance.

Unity gain, flat response

The baseline setting for the Lumin is as follows: Midrange 12:00, Contour 8:00, Process 8:00, Low

Frequency toggle in the down position (50 Hz), Hi Frequency toggle in the center position (10kHz).

There is a very slight roll-off above the high frequency and below the low frequency, but otherwise the

effect signal should be indistinguishable from the bypass signal.

Midrange knob

The midrange is a bandpass filter, so it controls all the frequencies in between the high and low settings.

It is highly interactive with the Contour and Process controls. The higher those knobs are set, the less

of an impact the midrange knob will have, controlling a narrower frequency band. Conversely, if those

knobs are turned all the way down, the midrange knob will affect a very wide frequency spectrum and

act almost as a level control.

Adjusting the frequencies

If you follow the parts list, the frequencies of the toggle switches are those shown at the bottom of

page 2. These settings can be adjusted by changing C4/C5/C6 (high frequencies) and C7/C8/C9 (low

frequencies). For each of the six positions, the capacitor value can be reduced to raise the frequency, or

increased to lower the frequency.

Hi Frequency switch

This sets the frequency for the Process control.

• C4: 2n7 (10kHz). This capacitor is always engaged, so it adds to the value of C5 or C6 in the other

two settings and will impact their frequencies if it is changed.

• C5: 2n2 (7.3kHz). Added to C4 when engaged.

• C6: 6n8 (5.1kHz). Added to C4 when engaged.

Low Frequency switch

This sets the frequency for the Contour control.

• C7: 18n (105 Hz). This capacitor is always engaged, so it adds to the value of C8 or C9 in the other

two settings and will impact their frequencies if it is changed.

• C8: 15n (74 Hz). Added to C7 when engaged.

• C9: 56n (50 Hz). Added to C7 when engaged.

LUMIN SONIC ENHANCER