Metric Halo SpectraFoo - Manual (Page 116)

Glossary
116
Figure 183: One cycle
The abbreviation Hz is used to indicate frequency; 60 Hz means the signal
makes 60 cycles per second. For large values a “k” is used to indicate that
the value is multiplied by 1000. For example 15 kHz is 15,000 cycles per
second.
I
Impedance The opposition of a circuit to alternating current. In audio, it is important to
match the impedance characteristics of inputs and outputs:
• High impedance sources (guitar, bass, keyboards) should be plugged
into a DI. These are commonly called “Hi-Z”.
• Low impedance sources (microphones, line-level devices) should be
plugged into mic preamps or line-level inputs. These are commonly
called “Lo-Z”.
K
K-System A metering standard developed by Bob Katz that establishes a baseline
acoustic dB level and allowable headroom over the baseline.
L
Linear A mathematic function where the input and output change at a constant rate.
For example, the ratio setting on a compressor is a linear function; if set
to 2:1, for every 2 dB of input there will be 1 dB of output (once over the
threshold). 4 db of input results in 2 dB of output, etc.