This is the circuit diagram of enhanced Hafler Matrix surround sound decoder. The above schematic can be a basic technique to attain exactly the same factor (with some extra rewards) at line level (i.e. prior to the signal reaches the power amplifiers - in a bi-amped method, this circuit should be in between the preamp along with the electronic crossover). The extras obtainable are readily apparent:
- Wiring is simplified (despite the fact that extra power amplifiers are necessary)
- We now have a centre channel signal accessible
- Provision for a mono signal to a sub-woofer is simple
