So
@rawbine asked for a Volt comparison and it took a little longer because time does funny things when I put Volt in my ears.
If Penon made speakers, the Volt might be what they’d sound like. Moving from the Serial, you’re immediately hit with a bigger, warmer, more refined and simply more immersive experience. It’s simply an upgrade all round.
In particular, the Volt steps up whenever soundstage and atmosphere matter - whether it’s acoustics at a live performance or a small studio jam. I suspect it’s the upper treble from the ESTs at work here.
Likewise, vocals are predictably richer on the Volt but also more detailed and nuanced. I’m hearing not just notes, but the singers producing the notes, if that make sense.
It’s not in any way an indictment of the Serial. After all, the Volt costs more than twice as much. But for the tangible range of hifi improvements that it brings, I’d say it earns its keep, especially if you already know and love the Penon house sound.
And now cable pairings:
CEMA PS
So far my pick to go with the Volt. Bigger well defined low end, good amount of extension in the highs. It also seems to subtly clean up the sound - background is noticeably blacker, and notes sound a bit more three-dimensional and better defined without losing their nuances. They don’t feel etched at all, just more well rounded relying on nuance rather than outright contrast to bring that 3D effect. Besides, the PS looks so good with the Volt. Even the hardware matches perfectly. Yes I’m superficial.
CEMA Ag-Au
Quite similar to the PS, but with a slight tilt towards the highs and slightly less bass boost and 3D effect as the trade off. I haven’t explored this pairing that thoroughly yet but seem to prefer it slightly for vocals.
Flow
Comes across a bit louder and more forward than the other two. It doesn’t thin out the sound in any way but nevertheless makes me think the Volt likes a smidge of copper to show off its best qualities, much like how Serial wants a bit (or in my case, a lot) of silver in its cable.
Quick note on fit
Volt is bigger (no brainer there) and I can’t wear it for as long as the Serial without it starting to hurt. But interestingly I realised that on the Volt, ML Spirals fit like a dream, unlike on the Serial where I was wondering if I’d suddenly gone down half a size.