Operating Manual - PROTEA SYSTEM II 4.24C Crossover / System Processor
4.6Audio Functions
4.6a Gain
Input and Output Gain are separately adjustable from
The output gain menu also provides for selection of input source(s) for a given output channel, as well as polarity of the outgoing sig- nal. Input signal sources are A, B, C, D, A+B, C+D, all four inputs com- bined, or no input (Off). Keep in mind that two signals which share significant content, such as a stereo source, will be up to 6dB louder when combined.
Input Gain LCD Display
Input Gain
Channel 
GAIN
Level 
0.0dB
Output Gain LCD Display
|
|
|
|
| Signal Source |
Output Gain |
|
|
|
| A,B,C,D |
|
|
|
| ||
|
|
| |||
Channel |
| GAIN 1 | Source:A |
| A+B,C+D,All |
Level |
| 0.0dB | Pol:Normal |
| Output |
|
|
|
|
| Polarity |
|
|
|
|
4.6b EQ
EQ LCD Display
The Protea 4.24C EQ section offers full parametric EQ as well as 1st and 2nd order shelving filters on inputs and outputs. Each input chan- nel has six selectable EQ filters, while each output channel has four select- able EQ filters. In all cases, each fil- ter is selectable between parametric (PEQ), 1st order Low Shelf (LS1), 2nd order Low Shelf (LS2), 1st order High Shelf (HS1), and 2nd order High Shelf (HS2).
|
|
|
|
| 6 Input Fltrs | Parametric | ||
|
|
|
|
| 4 Outpt Fltrs | Low | ||
Ch. |
|
|
|
|
|
|
| Low |
|
|
|
|
|
|
| High | |
|
|
|
|
|
|
| ||
Ch. |
| EQ 1 |
|
| High | |||
|
|
| ||||||
EQ +/- |
| 0.0dB 1000Hz 1.00o |
| Parametric | ||||
Level |
|
|
|
|
|
|
| Bandwidth |
|
| PEQ, |
| LS, HS | ||||
|
|
|
|
| ||||
|
|
|
|
| ||||
|
|
| Frequency |
| ||||
Shelving EQ filters: 1st order fil- ters use a gentle 6dB per octave slope, while 2nd order filters use a 12dB per octave slope for more a pronounced boost or cut. All shelving filters have a boost/cut range of +/- 15dB. Low shelving filters have a frequency range from 19.7Hz through 2kHz, and the high shelving filters range from 3.886kHz through 21.9kHz. Shelving filters are most useful as broad tone controls to boost or cut the high end or low end of an audio signal's frequency content. Because they affect a wider spectrum of audio, they are not as suit- able for feedback control as parametric fil- ters.
1st Order Filter
Low Shelf | 2nd Order Filter | High Shelf |
+20dB
+10dB
0dB
20Hz | 200Hz | 2KHz | 20KHz |
4. 24C Shelving Filters
6
