Pass XA25 for my system


I have been a long-time lurker here, but never posted until now. I have learned a lot from reading other posts and I thought it would be nice to share details on my current system. Also wondering if anyone has thoughts on switching from Hegel to a Pass XA25 amp.

Current system:

  • Room: 14x19 living room with medium(ish) damping - couch, rug, bookshelves, plants etc.; however, no dedicated room treatments.
  • Sonicorbiter i9 optical Roon server upsampling to DSD128
  • Fiber to Sonore Opicalmodule Deluxe 2 (Sonore LPS with Mundorf Silver/Gold DC cable)
  • Sablon Ethernet 2020
  • Bricasti M3 DAC and Roon endpoint running exclusively via NDSD conversion (3x Isoacoustics Orea)
  • Audioquest Fire XLR cables
  • Linear Tube Audio Microzotl Level 2 preamp with Lundahl balanced transformer input, Ray Reserve and Gold Lion tubes.
  • Iconoclast Series 2 OCC RCA cables
  • Hegel H390 Integrated (using as amp with HT bypass)
  • Audioquest Robin Hood speaker cables
  • Dynaudio Heritage Special (Dynaudio Stand 6 with Isoacoustics Gaia feet) 
  • Power: AQ Niagara 1200, AQ tornado and Cardas power cables.

My system is relatively modest, but was carefully assembled and it sounds pretty great to me. After adding the Microzotl preamp and seeing the improvement, I am thinking of replacing the Hegel (I am not using the preamp or DAC functionality) and trying a new amp. Thinking of the Pass XA25 after reading great reviews and seeing other people matching it with both my speakers and preamp. To be clear, the Hegel has been great and is a good match for my speakers. Dynamics are great, clarity, detail and a very relaxed feel to the sound. It was maybe just a touch too “clean/thin” before the LTA preamp. That move added a little more body, better imaging and soundstaging so curious to see what the Class A XA25 might do to further improve on these areas. The LTA Microzotl also helped with lower level/volume listening allowing more detail and dynamics to come through. With the Hegel volume control, I had to turn things up quite a bit to get things sounding their best. I also tried the Bricasti as a preamp and that was slightly less preferable than using either the Hegel or LTA for volume control.

I am still slightly nervous moving away from the Class A/B sound I am familiar with. Maybe it will soften things a little too much and be a step backwards? I was also considering a slightly used Class A/B Audionet Amp. I have no doubt they make excellent amps but I also couldn’t find many people using that brand and even fewer using it with my preamp and speakers. Any thoughts on whether the Pass XA25 will soften dynamics and transients significantly relative to my Hegel? I found some info. at 6Moons comparing the XA25 to Kinki Class A/B monoblocks and the comments seemed positive albeit a little mixed and unclear.

sfpeloton

Showing 5 responses by sfpeloton

Thanks for the input. To clarify, the Bricasti is still running balanced to my LTA preamp with Lundahl transformer conversion in the preamp and then SE output to the Hegel. I agree it is best to keep the Bricasti running balanced.

My impression from reading was that the XA25 was not as dark as the XA30.8, but your comment is why I am asking for feedback since that seems to be what some describe as the Pass sound.

I have been considering Coda as well. My take away was that the XA25 was possibly similar to the Coda S5.5 in sound signature and overall specs. XA25 is closer to 100 watts into 4 ohms with distortion less conservative than 0.01%

Lot's of thoughtful comments here so thanks to all who chimed in. After reading the comments, I do think the XA25 might be a little too warm for my tastes - even though it may be less warm than some other Pass offerings. 

My room is not very large - 14x19 with pretty standard ceiling height. I really hadn't been too concerned about the XA25 power since it has high current output and is very conservatively rated 50W at 0.01% distortion. However, I do like to turn up the volume some times and I wouldn't want to miss that.

Given the power issues and possible warmth of the XA25, I am leaning towards sticking with Class AB and it sounds like Audionet is one of the best options in that area. I had indeed been eyeing the Amp 1 V2 for sale here. I noticed the input impedance is 37 kohms. I think the LTA is 50 ohms so it should be okay? Any concerns about impedance mismatching or the pairing with the LTA?

Cbrez, you have a nice system. I remember coming across it at some point and it was one of the reasons I was thinking about the XA25.

I have the Ray Reserve tubes and Gold Lion 12AT7s. I thought they were a nice improvement over the stock tubes, I think they helped tighten up the bottom end and eliminated a small amount of treble glare I noticed with the stock tubes - although to be fair, the amp and tubes were also probably still burning in and settling at that point.

Seems like a lot of good recommendations and feedback here - Coda, Plinius, Pass. I may have to try the Pass at some point just to see why so many people and reviewers think they make great amps for a variety of systems. I also hear they have great customer service. I just worry that it might lack a little bite and power with my specific setup.

I have decided to go with the open box Audionet Amp 1 V2 that was listed here. zlone and fastfreight, thanks for the feedback on Audionet. Given that I generally like the Hegel, I think Audionet would be a step up, but maybe a similar signature to what I have with Hegel - Class AB, high wattage and damping factor.

Probably won't get it for a bit given the holiday timing, but I will report back on how it works in my setup.

Thanks again to all who commented as it did help me make a decision. Happy Holidays!

Happy New Year everyone. I wanted to circle back to this thread since the new amp has been playing for 5 days now and I have some initial thoughts on it. It is exactly what I was looking for and I am really pleased that I went with the Audionet Amp 1 v2. No, it doesn't "crush" the H390 as I really liked that sound as well. The Audionet just does everything a little bit better than the Hegel H390. Same iron grip on the Heritage Specials, but the sound is more refined and transparent. Some improvement in soundstage depth. There is almost a touch of warmth, but that word doesn't exactly capture what I am hearing. It can be almost hypnotic on the right songs and I find the music even more engaging and that is exactly what I was hoping for. Lastly, it seems to be a great match for my LTA Microzotl and cables. 

I really think I have all of the major pieces in place for a system I can enjoy for at least the next few years without needing to change things (except for maybe some small tweaking/experiments like adding an additional LPS on the dirty side of my fiber). One interesting thing that has happened is that due to the height of the amp, I need to reconfigure my audio rack.  I think I will take this opportunity to move the rack to a spot that should open up more room for me to play around with speaker positioning. When I change my listening position with this amp, I get a really good soundstage and stereo imaging. I think there is definitely more I can do with setup to fully enjoy the Audionet. FYI, there is also an article on speaker setup by Richard Mak that was just published over at PTA. I really enjoyed reading it and I am going to try some of the setup tips that are described.