Ok, I think I'm ready for my initial thoughts on the 25th Anniversary updates to my ZMA, in my setup at home. I'd like to preface this with a couple things to keep in mind.
#1 I think there is more here I'm not getting yet - I feel like the amp needs some burn in of the new parts and/or I need fresh tubes.
#2 My infamous L shaped room that has plagued me for years currently has hard floors in the form of LVP (Luxury Vinyl Planks). They are 8mm of layered Vinyl with a cork underlayment built in that I just installed. Side Note: I had to laugh that directions on these said they are sound absorptive. I think something was lost in translation, I think they maybe meant floor squeaks and footsteps maybe. Previously I had a really tired beige berber carpet throughout.
#3 While I know many of you live without Room Treatment, I can't have a serious listening session without some. The reflections and reverberations in a room are too chaotic to me without it, and currently my Room only has a couple studio grade absorbers on the ceiling. Everything else is packed up while I continue to work on installing the LVP floors.
So with those 3 items above, I was hesitant to post my initial thoughts on the amp. But after a little bit of mental recalibration and more burn in on the amp, I feel I can better speak to my initial thoughts. I will absolutely post more after much more burn in, room treatments, and maybe even new tubes if I can swing them...and YES, I will absolutely do a side-by-side with the little Zen that started all this 25th Anniversary madness. :)
Note: Thanks Donnie for the slab - it's found a good home and goes well with the new flooring! Now I just need to find a mate for the ZMA!
So, I plugged the amp in place of the Zen that I've been listening to, which for most of this year had pretty much knocked the ZMA off it's pedestal. I've had a love/hate for the Zen amp for 20 years, but the 25th Mods...well, like I said, it knocked the ZMA right out of rotation; I just couldn't listen to the big amp anymore. Anyways, I plug it in - System is one of my custom built Music Servers running ROON ROCK which pushes the bits out to the TEAC NT-503 via USB, and/or PS Audio DirectStream via Network and it's Bridge II network connection. From the ZMA it goes to my (yes, unfinished) El Camino speakers.
Initially I was like WTF, this sounds horrible...but then I remembered, oh yeah, the ZMA does that until it's warmed up and the big caps have evened out. Damnit, it's been almost 5 years and that still trips me up! Well, I let it play and warm up as I went about my business checking E-mail, making dinner, loading the dishwasher. I really don't pay attention to the music, and eventually something catches my attention, or even subconsciously I wander back into the listening room and find myself sitting and focused. But....that didn't happen. I let it play for hours, and while it sounded good, it didn't sound "engaging".
So last night I decided to start fresh. I went back and listened to the Zen amp for a bit to recalibrate my head, it helped me realize that the room reflections were messing with my perception of the mids on up. Then I put the ZMA back in, and gave it many hours of warmup time while I mowed the lawn, worked in the garage, basically did anything but listen. Then as I was walking through the house I got caught off guard by the bass. I don't recall what was playing, because I had Roon pretty much playing at random, but it had speed, punch, and grip. And I found myself sitting down and clicking on some new albums in my library - fresh music, and I started to hear my ZMA again!
Except...the bass. There was something sexy and lucid about it. Acoustic bass sounded woody and percussive, and electronic bass had more of a room filling, punch you in the chest feel about it. I don't mean to say that it was louder, but just had more weight to it, even at low volumes. I noticed this on the Zen amp after the mods, the little amp that could...except now the big amp with it's horsepower and new found speed had more grip on the bass. With that, the beginning and the end of each bass note was sharp and articulated. Not necessarily "deeper" mind you; the notes the system could hit didn't change, but the notes it hit were THERE!
As I continued to click through tracks, old and new, I started hearing more micro-detail and speed throughout the range. *That's* what I was looking for and expecting! But as I said, with the chaos of the more reflective room, I'm feeling a lot of what I'd normally be able to spot instantly is smeared in the reflections and I can't really fully flesh how good the amp is nor compare it to the little zen till I get the room tamed. I honestly didn't think the lack of room treatment would trip me up so badly, but there it is. I felt I needed to put some small update up, even if just to laugh at myself for thinking I could hear through the room and confidently state what the improvements are in the Upgrade. (sigh)
So yeah, not a very fleshed out review, but interesting. I'm looking forward to updating and putting the two amps head to head in the (hopefully) near future.