SHOWBOX BATTERY POWERED ALL-IN-ONE PERFORMANCE RIG WITH BREAKAWAY MIX CONTROL
21
Channel Equalization (EQ) Knobs
ShowBox has 3-band parametric EQ with shelving hi, peaking mid, and shelving low knobs. The 3-band equalization has low
shelving at 80 Hz, mid peaking at 2.5 kHz, and high shelving at 12 kHz.
Shelving means that the circuitry boosts or cuts all frequencies past the specified frequency. For example, the low EQ boosts
bass frequencies below 80 Hz and continuing down to the lowest note you never heard. Peaking means that certain frequencies
form a “hill” around the center frequency.
With too much EQ, you can really upset things. We’ve designed a lot of boost and cut into each equalizer circuit
because we know that everyone will occasionally need that. But if you max the EQ on every channel, you’ll get mix
mush. Equalize subtly and use the left sides of the knobs (cut), as well as the right (boost). If you find yourself
repeatedly using a lot of boost or cut, consider altering the sound source, such as placing a mic differently, trying
a different kind of mic, a different vocalist, changing the strings, or gargling.
The EQ circuits are based upon the designs of Cal Perkins, an industry-leader in audio engineering for over four decades
and a long-time collaborator. This “neo-classic” design provides the sweet musicality of the British EQ sound, while still
maintaining 15 dB of boost and cut with optimum Q and minimum phase shift (in other words, it gives you plenty of control
and is pleasing to the ear!).
Hi EQ Knobs
The hi EQ provides up to 15 dB of boost or cut above 12 kHz, and it is also flat (no boost or cut)
at center (noon). Use it to add sizzle, an overall sense of transparency, or an edge to keyboards,
vocals, guitar and bacon frying. Turn it down a little to reduce sibilance.
Mid EQ Knobs
Short for “midrange,” this knob provides up to 15 dB of boost or cut, centered at 2.5 kHz,
also flat at the center detent. Midrange EQ is often thought of as the most dynamic, because
the frequencies that define any particular sound are almost always found in this range.
You can create many interesting and useful EQ changes by turning this knob down as well as up.
Low EQ Knobs
The low EQ provides up to 15 dB of boost or cut below 80 Hz. The circuit is flat at the center
(noon). This frequency represents the punch in bass guitar, fat synth patches, and some
really serious male singers who eat raw beef for breakfast.
+15
+5
0
+10
–15
20 Hz
100 Hz
1 kHz
10 k 20 k
–5
–10
+15
+5
0
+10
–15
20 Hz
100 Hz
1 kHz
10 k 20 k
–5
–10
+15
+5
0
+10
–15
20 Hz
100 Hz
1 kHz
10 k 20 k
–5
–10
