In this video, the Triple Freedom team tests and analyzes the audio output of four SID chips: the original SID, ARMSID, X-SID, and SWINSID. The audio is recorded through a “Sound Blaster Z SE” line input in pure PCM format, ensuring zero compression for maximum sound quality.
The experiment includes running audio through a hardware test that generates standard audio signals and evaluates the filters. The chips are pushed to their limits using a demo and a game, “International Karate+.” The Commodore 64 is connected via audio cable to an amplifier, and the recordings are made using OBS Studio. To ensure accurate comparisons, the audio output is normalized, as each chip varies in volume.
During testing, the X-SID showed incomplete emulation of the analog components but performed adequately, while the ARM SID passed all tests flawlessly. The SWINSID, similar to the X-SID, had a lower volume.
The final analysis focuses on comparing the filter performance of all four chips. After normalizing the audio, a demo resembling the “Axel Foley” theme is used for further testing, followed by a playthrough of “International Karate+” to evaluate sound and music differences between the chips.
