As you can read in the previous posts, evaluation of the apodizing filter from the DSP5200 revealed both advantages and disadvantages. Technical analysis of the filter revealed that it is the minimal phase version of the old linear filter.
Based on these results I set my goal to design a new filter that would combine the advantages of the linear and minimal phase filters, but would have none of its disadvantages. To be able to accomplish this I even had to write my own software to design the filter, because I could not find anything that could do what I required. Now I can report that after many months of hard work and some serious testing I have succeeded!
The characteristics of this new filter are quite remarkable:
- The sound is perfectly balanced: every frequency range (bass, mid, high) is clearly there, but does not cloud, obscure or influence the other ranges.
- Lows are incredibly tight and go deeper than ever before. Highs are clear and clean and reveal more detail than ever before.
- Voices are easy to hear, making lyrics and dialog easy intelligible.
- The imaging is very spacious, phase effects that normally sound weird now easily lock into place.
- The realism of voices, instruments and sounds is stunning, for movies sometimes even frightening.
- It has none of the disadvantages of the Meridian apodizing filter from the DSP5200.
Some additional remarks:
- The above findings are only valid for playback on loudspeaker systems. On headphones we only found a marginal improvement. This has some interesting implications, which need to be investigated further.
- It works with both lossless and lossy compressed data. We tested mainly with FLAC and DTS-HD MA, but also MP3, DD and DTS.
The filter will be offered as firmware mod for Meridian spinners (G08, 800v4 and 808v1) and processors (568.2, G61, G61R, G68, 861v3 and 861v4).