DSP Basics:
Intro:
Intro:
- Most DSPs have these same features:
- Crossover
- Polarity (0/180 deg phase)
- Time Alignment – ability to delay signal so all channels reach the listener at the same time
- Levels – essentially gain for each output channel
- Equalizer
- The difference in DSPs is usually small, in regards to features. The difference typically comes in the resolution of adjustment of these features or (most notably) the interface. Here are some examples*
*Note: This is NOT intended to be a summary of all features of every DSP. I’ve just chosen specific examples.:
- Resolution of adjustment:
- Alpine PXA-H800 uses 0.5dB increments for levels; Helix DSP uses 1dB
- Alpine PXA-H800 uses 1/3 octave frequencies for crossover points; Helix DSP has 1/12 octave (in other words, Helix has a whole lot more flexibility); ARC Audio PS8 allows you to type in any number you wish
- There are some exceptions where a DSP has something different (Helix offers adjustable phase in 15 degree increments on the subwoofer channel)
- Interface:
- Most DSPs are now controlled via a computer interface, though some are still controlled directly through the DSP (ie; Pioneer P99 or Alpine H800)
- This is user preference. Some prefer to have a laptop and some prefer to be able to tune ‘on the fly’.
- Resolution of adjustment: