You might try those to see if that will do it... but... the DV332 is a fairly bright, clear, detailed amp - which is why its so great with Senns. The DAC1 is also - so you may have a bit of difficulty taming the combination enough to suit your preferences.
And... I doubt a tube buffer will do it either. The Yaqin 2 tube (6J1) version, less likely than the Yaqin 1 tube (6DJ8/6922) version, which has a better selection of tubes (offered by Pacific Valve). The EE MM BBA is a pretty expensive tube buffer / impedence matcher just to warm the sound a bit. You'd have over $1200 invested in your amp/buffer combo - which will buy a fairly nice amp. If you're going to keep your DAC1, you may want to just upgrade your amp to one that might provide a warmer sound - perhaps a SP. Or... you might try one that allows you to switch back and forth between OTL and TC modes (e.g. ASL, or Cayin, etc.). This might be the way to go... if you're wanting to retain all the detail of the DAC1. The M24 provides lots of detail, but its likely a bit less than the DAC1 - though its more musical.
You might also try the Senns (modded HD580/600), or another DAC. The M24 provides a warmer, more liquid, organic sound - which is also a bit bright. But, you can tame it, if need be, with warmer tubes than the JAN Philips 6922s.
The NM24 (2007/8 version with black faceplate) has both tube and SS DACs, uses the 96/24 PCM1704 chip, and is a bit brighter than the M24 (2006/7 version with silver faceplate). Some prefer the older M24 with the PCM63 chip to the NM24.
Originally Posted by niccon
I got myself 332 about 1 month back but my recent addition of benchmark dac1 makes it sounds slight too hash/bright for listening with DT770 (W1k, still not too bad). Before I decide to get Yaqin tube buffer or EE BBA or change to Monarchy M24 dac. I wonder is there a possibility to smoothen out the hash by tube rolling.
From what I gathered by reading this entire thread, it seems that Svetlana 6s19P-B/V with Mullard M8100 combo should able to achieve my objective of getting a warm, lush, better sound stage, improve bass while still retaining the detail from dac1.
Kindly advise if I have drawn the correct conclusion or recommend a better combo for my required parameters.