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Version 0.9

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Added: Filter type "IIR", which allows to specify a user-defined IIR filter of arbitrary order with custom coefficients.
Improved: For playback devices, the APO is now installed both as GFX (post-mix) and LFX (pre-mix) APO. Normally the filtering happens in GFX, but the command "Stage" allows to select LFX to apply effects based on the number of input channels.
Added: Expression language. The commands "If", "ElseIf", "Else", "EndIf", "Eval" and inline expressions allow to change the filter behaviour based on runtime conditions.
Added: Command "Copy", which copies audio data between channels.
Added: Command "Delay", which delays the audio on the currently selected channels.
Improved: Configuration files are now locked exclusively for writing while reading them.
Improved: There is now a transition (10 ms) from old to new configuration after loading.
Improved: Substantial internal restructuring to improve extensibility and maintainability. Filtering commands now work exactly in the order they were specified.
Fixed: When the microphone input was in stereo but the application requested a mono stream, the audio was heavily distorted.
Fixed: The sine sweep generated by the Benchmark application had floating-point precision issues leading to severe artifacts when certain filters were applied.
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jthedering committed 2014-08-10 18:35:59 +00:00
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Wiki/Configuration reference.txt
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This page describes the configuration file format and the commands supported by Equalizer APO. This information is meant for advanced users. To get an introduction to using Equalizer APO or if you need troubleshooting go to the [user documentation](https://sourceforge.net/p/equalizerapo/wiki/).
**Table of contents:**
[TOC]
# Configuration file format
The configuration files of Equalizer APO are organized as lines of the following format:
Command: Parameters
All lines not conforming to this format are silently ignored, like the comment lines that start with # in the example below.
Lines that contain any command name not supported are also silently ignored.
Example:
:::perl
Device: High Definition Audio Device Speakers; Benchmark
#All lines below will only be applied to the specified device and the benchmark application
Preamp: -6 db
Include: example.txt
Filter 1: ON PK Fc 50 Hz Gain -3.0 dB Q 10.00
Filter 2: ON PEQ Fc 100 Hz Gain 1.0 dB BW Oct 0.167
Channel: L
#Additional preamp for left channel
Preamp: -5 dB
#Filters only for left channel
Include: demo.txt
Filter 1: ON LS Fc 300 Hz Gain 5.0 dB
Channel: 2 C
#Filters for second(right) and center channel
Filter 1: ON HP Fc 30 Hz
Filter 2: ON LPQ Fc 10000 Hz Q 0.400
Device: Microphone
#From here, the lines only apply to microphone devices
Filter: ON NO Fc 50 Hz
<br>
# Filtering commands
These commands directly change the audio on the selected channels.
## Preamp
**Syntax:**
Preamp: &lt;Negative number&gt; dB
**Description:**
Sets a preamplification value in decibels. This is useful when you are using filters with positive gain, to make sure that no clipping occurs. Since version 0.8, when multiple preamps apply to the same channel, the resulting preamp is the sum in dB.
**Example:**
:::perl
Preamp: -6.5 dB
<br>
## Filter
**Syntax:**
Filter &lt;n&gt;: ON &lt;Type&gt; Fc &lt;Frequency&gt; Hz Gain &lt;Gain value&gt; dB Q &lt;Q value&gt;
Filter &lt;n&gt;: ON &lt;Type&gt; Fc &lt;Frequency&gt; Hz Gain &lt;Gain value&gt; dB BW Oct &lt;Bandwidth value&gt;
**Description:**
Adds a filter of the specified type with the specified frequency, gain and Q / bandwidth. The supported filter types and their parameters are listed below. The first parameter variant (with Q) is the filter text format used by Room EQ Wizard for equalizer type "Generic" while the second variant (with bandwidth) is used for equalizer type "FBQ2496". The filter number (n) is not interpreted and can be omitted.
The following table lists the filter types supported by Equalizer APO since version 0.8.1. The columns Fc, Gain and Q/BW show the parameters supported by the filter type. An 'X' means that the parameter is required while an 'O' denotes an optional parameter. The filter types supported cover all filters of the "Generic" and the "FBQ2496" equalizer type. Other equalizer types may also be compatible if their filter text format is. There is one exception however: The band-pass filter supported by Equalizer APO is a real band-pass filter that does not support gain, like low/high-pass filters, but unlike the DCX2496's "BP" filter, which is actually a peaking filter.
Type | Description | Fc | Gain | Q/BW | Example for filter parameters
- | - | - | - | - | -
PK<br>Modal<br>PEQ | Peaking filter<br>(Parametric EQ) | X | X | X | ON PK Fc 50.0 Hz Gain -10.0 dB Q 2.50<br>ON Modal Fc 100 Hz Gain 3.0 dB Q 5.41 T60 target 100 ms<br>ON PEQ Fc 100 Hz Gain 1.0 dB BW Oct 0.167
LP<br>LPQ | Low-pass filter | X | | O | ON LP Fc 8000 Hz<br>ON LPQ Fc 10000 Hz Q 0.400
HP<br>HPQ | High-pass filter | X | | O | ON HP Fc 30.0 Hz<br>ON HPQ Fc 20.0 Hz Q 0.500
BP | Band-pass filter<br>(not from DCX2496) | X | | O | ON BP Fc 1000 Hz Q 0.100
LS<br>LSC x dB | Low-shelf filter<br>(with center freq.,<br>x dB per oct. (LSC)) | X | X | | ON LS Fc 300 Hz Gain 5.0 dB<br>ON LSC 10.8 dB Fc 300 Hz Gain 5.0 dB
HS<br>HSC x dB | High-shelf filter<br>(with center freq.,<br>x dB per oct. (HSC)) | X | X | | ON HS Fc 1000 Hz Gain -3.0 dB<br>ON HSC 6 dB Fc 100 Hz Gain -6.0 dB
LS 6dB<br>LS 12dB | Low-shelf filter<br>(6 / 12 dB per octave<br>with corner freq.) | X | X | | ON LS 6dB Fc 50.0 Hz Gain 7.2 dB<br>ON LS 12dB Fc 2000 Hz Gain -5.0 dB
HS 6dB<br>HS 12dB | High-shelf filter<br>(6 / 12 dB per octave<br>with corner freq.) | X | X | | ON HS 6dB Fc 12000 Hz Gain 10.0 dB<br>ON HS 12dB Fc 500 Hz Gain 5.0 dB
NO | Notch filter | X | | O | ON NO Fc 800 Hz
AP | All-pass filter | X | | X | ON AP Fc 900 Hz Q 0.707
<br>
## Filter with custom coefficients (since version 0.9)
**Syntax:**
Filter &lt;n&gt;: ON IIR Order &lt;m&gt; Coefficients &lt;b0&gt; &lt;b1&gt; ... &lt;bm&gt; &lt;a0&gt; &lt;a1&gt; ... &lt;am&gt;
**Description:**
Adds a generic IIR filter with the given order and coefficients. The number of coefficients must be 2*(order+1).
The transfer function of the filter is
<img src="/p/equalizerapo/wiki/Images/attachment/Transfer function.png">
As the filter coefficients are normally dependent on the sample rate, the If command or inline expressions should be used to supply the correct coefficients for the current sample rate.
Although it is possible to use the IIR filter type to implement the same BiQuad filters that are supported by the other filter types, this is not advisable because the execution time will be higher.
**Example:**
:::perl
# A lowpass biquad filter with Fc 3000 Hz for the sample rate 48 kHz
Filter: ON IIR Order 2 Coefficients 0.0380602 0.0761205 0.0380602 1.2706 -1.84776 0.729402
<br>
## Delay (since version 0.9)
**Syntax:**
Delay: &lt;t&gt; ms
Delay: &lt;n&gt; samples
**Description:**
Delays the audio on the selected channels by t milliseconds or n samples. Milliseconds should be preferred because they will give equal delay independent of the sample rate.
**Example:**
:::perl
# Delays the audio by 50.5 ms independent of sample rate
Delay: 50.5 ms
# Delays the audio by 480 samples (10 ms at 48 kHz)
Delay: 480 samples
<br>
## Copy (since version 0.9)
**Syntax:**
Copy: &lt;Target channel&gt;=&lt;Factor&gt;*&lt;Source channel&gt;+...
Copy: &lt;Target channel&gt;=&lt;Source channel&gt;+...
Copy: &lt;Target channel&gt;=&lt;Constant value&gt;+...
**Description:**
Replaces the audio on the target channel by the sum of the given source channels with optional factors. To add instead of replace the audio on the target channel, the target channel itself can also be a source channel. The factor can also be specified in dB by appending dB. Multiple channel assignments can be specified on a single line by separating them with spaces, therefore a single assignment must not contain spaces. Instead of channel and factor, a constant value can be specified. To avoid ambiguity with numerical channel indices, the constant value must contain a decimal point.
**Example:**
:::perl
# Adds the audio on channel R multiplied by 0.5 to channel L
Copy: L=L+0.5*R
# Replaces the audio on channel L by the audio on channel R
# plus the audio on channel C attenuated by 6 dB
Copy: L=R+-6dB*C
# Replaces the audio on the first channel by the audio previously on channel R
# Also sets the audio on channel R to the constant value 0.5
Copy: 1=R R=0.5
# Attention: Sets the audio on channel L to the audio on the second channel
# (not to constant value 2, because no decimal point is present)
Copy: L=2
<br>
# Control commands
These command do not directly affect the audio but control which commands are executed or how they affect the audio.
## Include
**Syntax:**
Include: &lt;File name&gt;
**Description:**
Loads the given file as a configuration file. Instead of directly replacing config.txt, it can be better to load the actual filter definition from a separate file so that you can e.g. set a preamp before.
**Example:**
:::perl
Include: example.txt
<br>
## Device (since version 0.7)
**Syntax:**
Device: &lt;Device pattern 1&gt;; &lt;Device pattern 2&gt;; ...
**Description:**
Matches the given pattern to the connection name, device name and GUID of the current output device. If the pattern does not match, all following commands except Device commands are ignored. The pattern consists of words separated by space that must all be found in the string "***Device_name*** ***Connection_name*** ***GUID***". Multiple patterns of which one must match can be specified by separating the patterns with ';'. The special pattern "all" matches always. The benchmark application uses the device name "Benchmark" and connection name "File output". The easiest way to generate a Device command is to use the button in the Configurator application.
**Example:**
:::perl
# Matches the device "High Definition Audio Device" with connection "Speakers"
# and also the device "Benchmark" used by the benchmark application
Device: High Definition Audio Device Speakers; Benchmark
<br>
## Channel (since version 0.8)
**Syntax:**
Channel: &lt;Channel position 1&gt; &lt;Channel position 2&gt; ...
**Description:**
Selects the channels to which the following Filter and Preamp commands will be applied. Channel positions can be given by identifier (acronym of 1 up to 3 characters) or by number (counted from 1). The supported channel configurations are listed below. If a channel configuration is not supported, channels can only be selected by number. Multiple channels can be specified by separating with space. The special position "all" selects all channels.
**Channel configurations:**
The following table lists the channel configurations that are supported by Equalizer APO. The channel identifiers in the column titles resemble the channels in Start -> Control Panel -> Sound -> Configure. If a channel position is supported for a configuration, the cell in the corresponding row contains the channel number.
Configuration | Left<br>L | Right<br>R | Center<br>C | Subwoofer<br>SUB | Rear left<br>RL | Rear right<br>RR | Rear center<br>RC | Side left<br>SL | Side right<br>SR
- | - | - | - | - | - | - | - | - | -
Mono | | | 1 | | | | | |
Stereo | 1 | 2 | | | | | | |
Quadraphonic | 1 | 2 | | | 3 | 4 | | |
Surround | 1 | 2 | 3 | | | | 4 | |
5.1 Surround | 1 | 2 | 3 | 4 | | | | 5 | 6
5.1 Surround | 1 | 2 | 3 | 4 | 5 | 6 | | |
7.1 Surround | 1 | 2 | 3 | 4 | 5 | 6 | | 7 | 8
<div style="border: 2px solid red; padding: 3px">
<b>Attention:</b><br>
Although it might be tempting to assign low frequency filters only to the subwoofer channel, this might not lead to the expected results. Many audio systems apply bass redirection after Equalizer APO has processed the signal, so filters applied to the subwoofer channel won't be effective for redirected sound. Furthermore, as crossover filters only gradually fade in, the low frequency audio might be played over multiple speakers, not just the subwoofer, reducing the effectivity of subwoofer-only filters. Therefore, to avoid these problems, it's recommended to <b>apply low frequency filters to all channels</b>.
</div>
<br>
**Example:**
:::perl
# Selects the left channel and the rear left channel
Channel: L RL
# Selects the first, second and center channel
Channel: 1 2 C
<br>
## Stage (since version 0.9)
**Syntax:**
Stage: &lt;stage 1&gt; &lt;stage 2&gt;
**Description:**
Specifies on which stage(s) the following filtering commands will be executed. For output devices, there are two stages: pre-mix and post-mix as illustrated in the following (simplified) diagram:
<a href="/p/equalizerapo/wiki/Images/attachment/Stages.svg"><img src="/p/equalizerapo/wiki/Images/attachment/Stages.png"></a>
For input devices, there is only the capture stage. Initially, the selected stages are post-mix and capture, so that the filtering commands are executed exactly once for output and input devices. The post-mix stage is preferred to the pre-mix stage because the filtering happens per-application in the pre-mix stage and is therefore more cpu-intensive. However, for specific purposes such as upmixing the pre-mix stage has to be used as it can do filtering based on the number of input channels.
**Example:**
:::perl
Stage: pre-mix
# do upmixing
If: inputChannelCount == 2
# note that there may be audio on SL, SR from another APO
Copy: SL=SL+L SR=SR+R
EndIf:
# ...
Stage: post-mix
# do room correction
# ...
<br>
# Expression commands (since version 0.9)
These commands use expressions to alter the processing behaviour based on runtime variables. Expressions are a tiny language embedded in the configuration file language with a syntax that is closer to scripting languages. The language consists of constants, variables, operators and functions.
**Constants:**
Name | Description
- | -
e, pi | Mathematical constants
inputChannelCount | Number of channels that are input to the current APO stage
outputChannelCount | Number of channels that are output from the current APO stage
sampleRate | Sample rate (in Hz) of the audio in process
deviceName | Name of the audio device
connectionName | Name of the connection on the audio device
deviceGuid | GUID of the audio device endpoint
stage | Current APO stage (can be pre-mix, post-mix or capture)
**Variables:**
User-defined variables that are valid while loading the configuration can be defined using the assignment operator (=). The variables will not be retained between configuration reloads, they are just meant to carry temporary values that will be used later in the configuration file.
**Operators:**
Name | Description
- | -
+, -, *, /, ^ | Arithmetic operators
=, +=, -=, *=, /= | Assignment operators
and, or, xor | Logical operators
==, !=, <, >, <=, >= | Comparison operators
&, &#124;, <<, >> | Bit-wise / bit-shift operators
+ | String concatenation (at least one argument must be a string)
(float), (int) | Type conversion (from numerical type)
condition ? then : else | Conditional operator (ternary if-then-else)
{1,2} | Array creation
array\[0\] | Array access
**Functions:**
Name | Description
- | -
abs | Absolute value
sin, cos, tan,<br>sinh, cosh, tanh | Trigonometric functions
ln, log, log10, exp | Logarithmic / exponential functions
sqrt | Square root
min, max, sum | Minimum / maximum / sum of arguments
str2dbl | Conversion from string to float value
strlen | Length of string
tolower, toupper | Conversion to lower / upper case
sizeof | Length of array
regexSearch | Searches first match in string (second argument) to regular expression (first argument). Result is empty if not matching. If matching, result is array with whole match as first value and capturing groups as further values.
regexReplace | Replaces all matches in string (second argument) to regular expression (first argument) with string (third argument). Result is string with replacements.
readRegString | Reads value (second argument) from specified key (first argument) in the registry. Value must be of type string (REG_SZ). Automatically monitors the registry key for changes and initiates a configuration reload on any value change.
readRegDWORD | Reads value (second argument) from specified key (first argument) in the registry. Value must be of type integer (REG_DWORD). Automatically monitors the registry key for changes and initiates a configuration reload on any value change.
The types supported in expressions are string, boolean, int, float and matrix/array. In error messages, these types are abbreviated to 's', 'b', 'i', 'f' and 'm'. String constants are specified in quotes ("). Backslashes (\\) and quotes need to be escaped by prefixing them with a backslash. Boolean constants are specified as true or false. Integer and float constants are specified without thousands separators and using point (.) as the decimal separator in case of float. Array constants are specified using the {} operator.
Multiple expressions can be combined into one expression by separating them with semicolon (;). The result will be the value of the last expression.
**Examples:**
:::perl
# User-defined variables
Eval: a=0; b=pi
# Comparison
Eval: a > b ? "a is larger" : "b is larger"
# Trigonometric functions and exponentiation operator
Eval: sin(a)^2 + cos(a)^2 == 1
# Matching device name with regular expression
Eval: a=regexSearch("High Definition .*", deviceName); sizeof(a) > 0 ? "found" : "not found"
# Reading configuration path from registry
Eval: readRegString("HKEY_LOCAL_MACHINE\\SOFTWARE\\EqualizerAPO", "ConfigPath")
<br>
## If / ElseIf / Else / EndIf
**Syntax:**
If: &lt;expression&gt;
ElseIf: &lt;expression&gt;
Else:
EndIf:
**Description:**
Conditionally executes the commands between If and EndIf. This resembles the if/else conditional statements found in most programming languages.
When the command If is encountered, its expression is evaluated and converted to a boolean value. If the result is true, the following commands are executed, otherwise they are skipped.
When an ElseIf command is encountered after an If or ElseIf command which evaluated to true, the following commands until EndIf are skipped. If the previous If or ElseIf command evaluated to false, the expression of the ElseIf command is evaluated and the following commands are executed if the expression evaluated to true.
The Else command behaves as an ElseIf command whose expression always evaluates to true.
The EndIf command ends the conditional execution.
Conditional execution can be nested, so between If and EndIf can be another If statement. ElseIf and Else always refer to the latest If which was not ended by EndIf. To improve the readability, lines can be indented by inserting space or tab characters at the beginning.
For technical reasons, If statements can not be used to conditionally execute Device statements as Device statements have a higher priority.
**Example:**
:::perl
# Executes statements according to the current sample rate and channel count
If: sampleRate == 44100
...
ElseIf: sampleRate == 48000
...
If: inputChannelCount == 1
...
ElseIf: inputChannelCount == 2
...
ElseIf: inputChannelCount == 6
...
EndIf:
Else:
...
EndIf:
<br>
## Eval and inline expressions
**Syntax:**
Eval: &lt;expression&gt;
&lt;Command&gt;: ... \`&lt;expression&gt;\` ...
**Description:**
The Eval command just evaluates the expression without using its result any further. It is mainly useful to define variables or for testing purposes.
Inline expressions are used to embed the result of an expression into the parameter string of a command. The result of the expression is converted into a string and replaces the inline expression from the first backtick(`) to the second backtick, inclusive.
For technical reasons, inline expressions cannot be used in Device and If/ElseIf commands, but they can be used in Eval commands (to evaluate a calculated expression).
**Example:**
:::perl
# Specify gain linearly
Eval: linGain = 0.5
Filter: ON PK Fc 1000 Hz Gain `20*log10(linGain)` dB Q 10.0
<br>
Wiki/Documentation.txt
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Welcome to the Wiki of Equalizer APO. This is the documentation for users of Equalizer APO. Developers might also be interested in reading the [developer documentation](https://sourceforge.net/p/equalizerapo/wiki/Developer%20documentation/). To begin using Equalizer APO, you should read the <a href="#install_tutorial">tutorials</a>.
Welcome to the Wiki of Equalizer APO. This is the documentation for users of Equalizer APO. Developers might also be interested in reading the [developer documentation](https://sourceforge.net/p/equalizerapo/wiki/Developer%20documentation/). To begin using Equalizer APO, you should read the <a href="#install_tutorial">tutorials</a>. After that, you can look at more detailed information in the [configuration reference](https://sourceforge.net/p/equalizerapo/wiki/Configuration%20reference/).
**Table of contents:**
@@ -36,90 +36,7 @@ A detailed explanation of the usage of Room EQ Wizard is out of the scope of thi
Congratulations, you have now created your first configuration for Equalizer APO. To learn more about the usage of RoomEQWizard, you can look into its [help file](http://www.hometheatershack.com/roomeq/wizardhelpv5/help_en-GB/html/index.html). The process can even be automated to some extent, as is explained in this [forum thread](/p/equalizerapo/discussion/general/thread/3ba39cad/).
# Configuration file format
The configuration files of Equalizer APO are organized as lines of the following format:
Command: Parameters
All lines not conforming to this format are silently ignored, like the comment lines that start with # in the example below.
Example:
Device: High Definition Audio Device Speakers; Benchmark
#All lines below will only be applied to the specified device and the benchmark application
Preamp: -6 db
Include: example.txt
Filter 1: ON PK Fc 50 Hz Gain -3.0 dB Q 10.00
Filter 2: ON PEQ Fc 100 Hz Gain 1.0 dB BW Oct 0.167
Channel: L
#Additional preamp for left channel
Preamp: -5 dB
#Filters only for left channel
Include: demo.txt
Filter 1: ON LS Fc 300 Hz Gain 5.0 dB
Channel: 2 C
#Filters for second(right) and center channel
Filter 1: ON HP Fc 30 Hz
Filter 2: ON LPQ Fc 10000 Hz Q 0.400
Device: Microphone
#From here, the lines only apply to microphone devices
Filter: ON NO Fc 50 Hz
The commands currently defined are:
Command | Parameters | Description
-|-|-
Preamp | ***Negative number*** dB | Sets a preamplification value in decibels. This is useful when you are using filters with positive gain, to make sure that no clipping occurs. Since version 0.8, when multiple preamps apply to the same channel, the resulting preamp is the sum in dB.
Include | ***File name*** | Loads the given file as a configuration file. Instead of directly replacing config.txt, it can be better to load the actual filter definition from a separate file so that you can e.g. set a preamp before.
Filter ***n*** | ON ***Type*** Fc ***Frequency*** Hz Gain ***Gain value*** dB Q ***Q value*** | Adds a filter of the given type with the given frequency, gain and Q. The supported filter types and their parameters are listed <a href="filter_types">below</a>. This is the filter text format used by Room EQ Wizard for equalizer type "Generic". The filter number (n) is not interpreted and can be omitted.
Filter ***n*** | ON ***Type*** Fc ***Frequency*** Hz Gain ***Gain value*** dB BW Oct ***Bandwidth value*** | Adds a filter of the given type with the given frequency, gain and bandwidth. The supported filter types and their parameters are listed <a href="filter_types">below</a>. This is the filter text format used by Room EQ Wizard for equalizer type "FBQ2496". The filter number (n) is not interpreted and can be omitted.
Device | ***Device identification pattern*** | Matches the given pattern to the connection name, device name and GUID of the current output device. If the pattern does not match, all following commands except Device commands are ignored. The pattern consists of words separated by space that must all be found in the string "***Device_name*** ***Connection_name*** ***GUID***". Multiple patterns of which one must match can be specified by separating the patterns with ';'. The special pattern "all" matches always. The benchmark application uses the device name "Benchmark" and connection name "File output". The easiest way to generate a Device command is to use the button in the Configurator application. (added in version 0.7)
Channel | *** Channel positions *** | Selects the channels to which the following Filter and Preamp commands will be applied. Channel positions can be given by identifier (acronym of 1 up to 3 characters) or by number (counted from 1). The supported channel configurations are listed <a href="channel_configs">below</a>. If a channel configuration is not supported, channels can only be selected by number. Multiple channels can be specified by separating with space. The special position "all" selects all channels. (added in version 0.8)
Lines that contain any command name not in this list are silently ignored.
<a name="filter_types"></a>
# Filter types
The following table lists the filter types supported by Equalizer APO since version 0.8.1. The columns Fc, Gain and Q/BW show the parameters supported by the filter type. An 'X' means that the parameter is required while an 'O' denotes an optional parameter. The filter types supported cover all filters of the "Generic" and the "FBQ2496" equalizer type. Other equalizer types may also be compatible if their filter text format is. There is one exception however: The band-pass filter supported by Equalizer APO is a real band-pass filter that does not support gain, like low/high-pass filters, but unlike the DCX2496's "BP" filter, which is actually a peaking filter.
Type | Description | Fc | Gain | Q/BW | Example for filter parameters
- | - | - | - | - | -
PK<br>Modal<br>PEQ | Peaking filter<br>(Parametric EQ) | X | X | X | ON PK Fc 50.0 Hz Gain -10.0 dB Q 2.50<br>ON Modal Fc 100 Hz Gain 3.0 dB Q 5.41 T60 target 100 ms<br>ON PEQ Fc 100 Hz Gain 1.0 dB BW Oct 0.167
LP<br>LPQ | Low-pass filter | X | | O | ON LP Fc 8000 Hz<br>ON LPQ Fc 10000 Hz Q 0.400
HP<br>HPQ | High-pass filter | X | | O | ON HP Fc 30.0 Hz<br>ON HPQ Fc 20.0 Hz Q 0.500
BP | Band-pass filter<br>(not from DCX2496) | X | | O | ON BP Fc 1000 Hz Q 0.100
LS<br>LSC x dB | Low-shelf filter<br>(with center freq.,<br>x dB per oct. (LSC)) | X | X | | ON LS Fc 300 Hz Gain 5.0 dB<br>ON LSC 10.8 dB Fc 300 Hz Gain 5.0 dB
HS<br>HSC x dB | High-shelf filter<br>(with center freq.,<br>x dB per oct. (HSC)) | X | X | | ON HS Fc 1000 Hz Gain -3.0 dB<br>ON HSC 6 dB Fc 100 Hz Gain -6.0 dB
LS 6dB<br>LS 12dB | Low-shelf filter<br>(6 / 12 dB per octave<br>with corner freq.) | X | X | | ON LS 6dB Fc 50.0 Hz Gain 7.2 dB<br>ON LS 12dB Fc 2000 Hz Gain -5.0 dB
HS 6dB<br>HS 12dB | High-shelf filter<br>(6 / 12 dB per octave<br>with corner freq.) | X | X | | ON HS 6dB Fc 12000 Hz Gain 10.0 dB<br>ON HS 12dB Fc 500 Hz Gain 5.0 dB
NO | Notch filter | X | | O | ON NO Fc 800 Hz
AP | All-pass filter | X | | X | ON AP Fc 900 Hz Q 0.707
<a name="channel_configs"></a>
# Channel configurations
The following table lists the channel configurations that are supported by Equalizer APO. The channel identifiers in the column titles resemble the channels in Start -> Control Panel -> Sound -> Configure. If a channel position is supported for a configuration, the cell in the corresponding row contains the channel number.
Configuration | Left<br>L | Right<br>R | Center<br>C | Subwoofer<br>SUB | Rear left<br>RL | Rear right<br>RR | Rear center<br>RC | Side left<br>SL | Side right<br>SR
- | - | - | - | - | - | - | - | - | -
Mono | | | 1 | | | | | |
Stereo | 1 | 2 | | | | | | |
Quadraphonic | 1 | 2 | | | 3 | 4 | | |
Surround | 1 | 2 | 3 | | | | 4 | |
5.1 Surround | 1 | 2 | 3 | 4 | | | | 5 | 6
5.1 Surround | 1 | 2 | 3 | 4 | 5 | 6 | | |
7.1 Surround | 1 | 2 | 3 | 4 | 5 | 6 | | 7 | 8
<div style="border: 2px solid red; padding: 3px">
<b>Attention:</b><br>
Although it might be tempting to assign low frequency filters only to the subwoofer channel, this might not lead to the expected results. Many audio systems apply bass redirection after Equalizer APO has processed the signal, so filters applied to the subwoofer channel won't be effective for redirected sound. Furthermore, as crossover filters only gradually fade in, the low frequency audio might be played over multiple speakers, not just the subwoofer, reducing the effectivity of subwoofer-only filters. Therefore, to avoid these problems, it's recommended to <b>apply low frequency filters to all channels</b>.
</div>
This information has been moved to the [configuration reference](https://sourceforge.net/p/equalizerapo/wiki/Configuration%20reference/).
<a name="troubleshooting"></a>
# Troubleshooting
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