I compared the Aurender N150 plus BAD Alpha USB 2 combo to a Bluesound Vault 2. In this shoot-out, these units were streaming to a BAD Alpha Dac Reference 2 with the Michael Pflaumer MQA software upgrade.The N150 was connected to the Alpha USB via an Audioquest Diamond USB cable. The Alpha USB was connected to the DAC via an Audioquest Diamond AES/EBE cable. The Vault was connected to the DAC via a DH Labs D-750 SP/DIF cable with a BlackCat BNC to RCA adaptor. The rest of my system is described in my Audiogon profile.
The N150/Alpha USB combo was clearly superior to the Vault 2. Although I had streamed from the Vault 2 for many year with great pleasure in the head-to-head it was apparent that the Vault 2 was producing distortion, particularly jitter. Easily heard on female vocals were glare and shoutiness. The N150 did a better job of producing the original timbre of vocals and instruments. Again, there was delicacy and clarity. An easy analogy for me is a white wine with a high degree of minerality- where you can taste or imagine you can taste the water in the region the grapes were grown.
That said the N150 imparted some sweetness to the sound. Others have commented on the warm coloration produced by the N150. Some may prefer this. Also, the sound stage is not small but a wider and deeper rendering would be nice. I am eager to compare the N150 to N200 to see if the latter produces a more true-to-life sound in my system.
A heads-up that the break-in time on the N150 was considerable. (I was breaking in the USB and AES/EBU cables at the same time so it’s possible those pieces were responsible for the long break-in instead.) At around 200 hours the sound becomes stable. Prior to the sound stage and instrumental sounds go through several evolutions. There may some addition relaxing of the sound after 200 hours.