Of the countless times I've upgraded or changed something in my system, there's only been 2 occasions where the difference was large enough to garner a reaction.
1. When I first added the Terminator + into the chain.
2. Upgrading to the SP2 modules.
Used the Susvara for these impressions. Mainly took notes on these and spent the rest of the evening leisure listening.
Hotel California - Eagles: I should start at the beginning, but the amount of control in the outro guitar solos between Walsh & Felder is just so impressive. This section easily gets shouty on less than ideal gear & the guitars, albeit the star of the show at that point, can take away the drive of the rhythm section. Not on this amp. The increase in separation and air really give it room to breathe. During the chorus when Don Henley sings, ''Welcome to the Hotel California'', the accuracy & clarity in him pronouncing ''California'' is stunning. Micro detail with percussion is way easier to interpret and adds significantly to the overall image. Quite a noticeable increase in texture as well, at the 0:11-0:13 mark there's a sizzle that quickly dissipates from the left channel. Literally sounded like a baby rattlesnake slithering past my ear.
I Can't Tell You Why - Eagles: Dead silence. I actually had to shut off the A/C, because the noise coming from the vent was bleeding through. At 0:33-0:44 when Timothy Schmit sings ''Aren't we the same two people who lived through years in the dark?''. Right when he says ''dark'' you can clearly hear his tongue move and take a small breath before continuing the verse. Instant goosebumps. 3:10-4:55 is such a treat. Drums have presence and carry ample body with incredible realism. The relaxed tonality of the guitar combined with the amount of space & separation in the soundstage is enough to mentally drift off.
Try and Love Again - Eagles: Again, going backwards and starting at the end. This is another one where guitars can easily blend together and sound shouty, especially from 3:55-5:11 when they begin trading off. Cymbals can also get fatiguing/splashy with the wrong headphone. The GT flexes with the amount of control in this latter section. What could normally sound overbearing is incredibly balanced, from trading guitars, acoustic strumming, constant high hat, and background singers. The jump in detail is staggering. Each guitar strum & cymbal crash rings out just a bit more and tapers off with impressive ease. Even with the increase in detail & texture, I wasn't keying in on any specific area. It was actually easier to interpret the track as a whole.
If you haven't caught the drift yet, the SP2 modules make a substantial change. Every area is improved. At the level of my system, hearing a difference this noticeable doesn't happen often. The moment these hit the market, I'd snatch them up no questions asked. When Lachlan mentioned in his review ''You're jumping a whole 'nother tier'', I was immediately skeptical even though I agree with 80% of his impressions. Glad to report the hype is indeed real. Combined with upgraded op-amps, this is a serious amp around the $3k mark & there's nothing I can think of personally that beats it in this range.