John, it is the Yamaha DSP-A1, now several years old but still running strong. It has 3 subwoofer outs (2 for stereo subs and 1 for mono) with custom bass management options for LFE and redirected bass for all 3. In addition, the subwoofer output levels for DD and DTS can be set individually, meaning that when DD signals are being processed, the LFE out can be set to have one level, and when DTS signals are being processed, the LFE output can be set to a different level. The two levels are stored and automatically recalled when playing one format or the other. This is potentially useful since DD apparently has an LFE output that is 10 dB above the main signal, as recommended by Dolby. In my case, I decided to keep the same subwoofer level between DD and DTS soundtracks. Despite all of these wonderful features, I think it will soon be time to upgrade.
John
