DACs and bass response?

Seems like my choice of words is not skillful. With the COS, the bass, whether electric or acoustic, was very evident. Although it varied from one cd to another, I never had to struggle to hear it. And it was well-focused, not dispersed with too much bloom as I used to hear from my old Jolida tube integrated.  With La Voce, the bass was simply not very present on the majority of cds I played. It seemed to be buried in the mix or recessed. I don't really know how else to describe it. 

I'm using an Ayre QB 9 DSD and I've added a Regen ISO with the the optional linear power supply. I replaced the fuse with a Synergistic Research Black and attached an Akiko Audio XLR tuning stick to the Ayre DAC. These tweaks have made my DAC sound (to me) more natural, more balanced and with a greater degree of presence. I never up-sample, as it isn't necessary nor is it preferable. 
Doing this would probably alarm many however, I've tailored these tweaks to my own hearing. I would however appreciate slightly faster bass with more melodic structure whenever I'm listen to music options other than classical music and so I'm considering the new Synergistic Research Blue fuse for the Ayre. Is anyone using the Blue fuse?

@stuartk 

I am not familiar with the La Voce, but it sounds as though it may not have had enough burn-in time. Could it be the case? Also, did you notice any significant difference between balanced and single-ended outputs?

Best,

Luiz

Capacitance. A look inside a DAC will tell you. If it has allot of electrolytics it will typically have good bass.

I've owned several DAC's to date and some were more on the "thin" side in terms of Bass and others were a bit "thicker".

I have a hunch that the power supply design and how well its isolated from the rest of the sensitive pieces play a pretty big role here.

Of all the DAC's I've tried to date the best ones have been from EMM Labs/Meitner when it comes to deep/textured and clean bass output. I hear DCS is also very good in this area but I've not had the opportunity to hear that for myself, yet.