Contents
System requirements ...................................................................................... 3
Installing the HELIX DSP PC-Tool Software .................................................. 4
Connecting the PP50 DSP to the PC ............................................................. 6
Connecting the C-DSP/P-DSP to the PC ....................................................... 7
Starting the software ....................................................................................... 8
Operating controls ........................................................................................ 10
Description of the main navigation menu ..........................................................10
Channel selection .......................................................................................... 12
Linking channels: .............................................................................................. 12
Channel routing - conguring inputs and outputs .....................................13
Naming inputs: .................................................................................................. 13
Naming outputs: ................................................................................................14
Default settings of the individual channel types: ............................................... 14
Allocating inputs to outputs: .............................................................................. 15
High and low-pass lter settings .................................................................17
Crossover frequency .........................................................................................17
Filter characteristics .......................................................................................... 17
Butterworth
Bessel
Linkwitz
Chebyshev
Self-dene
Slope .................................................................................................................19
Q-factor ............................................................................................................. 21
High-pass and low-pass lter bypass function ..................................................22
Adjusting the output levels .......................................................................... 23
Adjusting the phasing and time alignment ................................................. 24
Adjusting the phase .......................................................................................... 24
Adjusting the time alignment .............................................................................25
Adjusting the equalizer ................................................................................. 27
Graphic 1/3 octave equalizer ............................................................................ 27
PP50 DSP: Parametric lter .............................................................................28
P-DSP: Graphic equalizer ne adjustment function ..........................................29
C-DSP: Graphic equalizer ne adjustment function .........................................30
Measuring frequency responses ................................................................. 31
Measuring equipment ....................................................................................... 31
Measuring microphone
Suitable preampliers
Suitable measurement signals
Measurement software ..................................................................................... 32
Appropriate car radio settings for taking readings
Frequency response readings .......................................................................... 34
Important information about the PP50 DSP ......................................................36