DSP and Class D
Since the DSP based solutions made great progress and the integrated DAC's are getting better, we became interested in the topic more and more. The development of Class-D amplifiers and high-quality switching power supplies are extremely important for active speakers.
In winter 2010, we were able to introduce the passive version of this speaker. The active variant exists as prototypes and has already convinced some of our testers.
We use the DSP-based filter for quite some time - e.g. when we evaluate and test with new chassis. These filters are developed extremely flexible and relatively fast, different polls can be compared very quickly. The total development can be so much more extensive and occur faster. It is very important for us to have our cutting edge measurement equipment.
The path from the evaluation board to a finished product is still far. In particular, the signaling pathway involved and the DAC's are a big issue.
FIR filter and time alignment
For developing our "custom-design" models, we started our investigations with DSP and a Class D technology. The products are quite expensive and complex. In addition, the project budgets are usually somewhat more extensive.
The possibility of equalization of very large loudspeakers and the use of class-d amps for the subwoofer made this technique even more interesting. Adjustments on site in the listening room can be easily implemented.