Getting back to the question of how this thing actually sounds . . .
Now with several weeks listening under my belt, here is an update to my previous posts on the SPP (#'s 132, 156, and 172)
From, say, 100 - 150 hours, the SPP opened up a bit in terms of sound stage and separation of voices. It also developed a bit of “warmth” in the midbass and midrange. The upper bass and lower midrange registers became noticeably more “punchy” in their delivery of bass lines and kick drums. The differences were not huge, but definitely noticeable. Overall, I continue to observe fewer “burn-in effects” with the SPP than my experiences with pre and power amps and DACs.
The differences I’m hearing between it and my reference Pass XP-15 remain more or less the same, but I’ve been able to refine my descriptions. The differences in sound stage “depth” have more to do with the perceived shape of the rearward sound stage. At the plane of my speakers, the sound stage width is nearly the same. However, the width seems to vary with depth. Center stage, there is little difference. However, the SPP in my setup has more of a “V” or “U” shaped front-to-back sound stage. The Pass has more of a “C,” or semi-circle shape, with more width towards the right and left as you move farther back.
The XP-15 has also thus far maintained the advantage in detail retrieval farther back in the sound stage. This, plus the difference in soundstage shape adds a greater “holographic” effect to the “in the room with you” aspect of these two phonostages. It seems like the SPP adds just a touch of grain or opacity that obscures low-level detail.
That said, the SPP’s upper and mid-bass punch is a welcome addition to older pressings that compressed the bass to reduce groove excursion in order to pack more music on the disc. The Pass extracts more detail and nuance from the bass lines, but at the same time the overall presentation is a bit more “polite,” which can be less involving depending on the recording, your mood, and the volume setting.
In fact I’ll hazard an opinion that, to the extent that the PSS deviates from “neutral,” those deviations favor and enhance what is likely to be retrieved from the run-of-the-mill discs found in most collections, while at the same time only just barely diminishing what’s on audiophile pressings. While formulating my thoughts, I stumbled across this observation by a blogger who was writing, of all things, about collecting vinyl as an investment. In an attempt to explain the resurgence in vinyl, he stated:
" Why the big comeback? Simply put — nostalgia, and a more desirable sound. The sound isn’t necessarily “better” per se, but it has a richness and fullness that fans say CDs just couldn’t duplicate."
So, OK, this guy obviously isn’t an audiophile, but he is onto something. I’m coming to believe that the SPP slightly deviates from neutral with precisely a touch of “richness and fullness” that complements vinyl reproduction perfectly.