How to Connect Headphones to a SMSL DAC

Update - thanks to everyone who chimed in answers!  I bought an RME ADI-2 DAC fs, which has a headphone amp with 2 outlets, one for IEM’s.  I also bought the Sennheiser HD600’s.  They sound great together.  This gives me the option to listen late at night without having to turn down the volume very low.

I chose this to avoid having another box and wires, as well as giving me a wide variety of controls including parametric EQ.  I also bought a UMIK 1, so I can do some room testing and perhaps adjust the sound for further improvements.  Since I don’t have a preamp, I had no adjustments before.  Enjoying the upgrade!

@soix Thx!  I’m not sure about connectors.  Would I use the balanced out from the DAC to the balanced in on the Singxer?  Right now my powered subs are using the balanced out on my DAC.  Could I instead plug them into the balanced out on the Singxer? (My powered speakers are connected to the RCA out on the DAC.)

@soix  Yes I’d like some headphone amp recommendations.  My price range would be up to $800.

Any one who cares to chime in with an amp suggestion, please do so!

My setup would be NODE N130 > SMSL M400 > Amp > Sennheiser HD600.

Here’s my system.  I have a NODE N130, but I’m bypassing the internal DAC.  A USB cable connects the NODE to a SMSL M400 DAC.  The M400 has 2 RCA outputs, these are connected to my 2 powered B&O speakers.  The 2 balanced outputs on my M400 each connect to one of my powered subs.  There’s no more outputs available.

So say I bought a Singxer, I would install interconnects between the balanced outputs on my M400, and the Singxer balanced inputs.  Having unplugged the 2 subs, I don’t know where I would reconnect them.

‘Right now I’m using my iPad to control the NODE, but volume is controlled by a remote for the M400.  You mentioned that the Singxer would control volume.  I would be using my system for both headphones and my speakers.  I don’t understand if my speakers/subs need to all connect to the Singxer, or if those stay connected to the M400.  And then, how do I switch between listening via the headphones and the speakers.

‘All this does point to the utility of the NODE, where everything is in one box and controlled by one controller.

Thx @soix  I have a better understanding.  I’ll give it more thought.  Often when I want to use headphones it’s late and I’m tired.  I don’t know if I would opt to switch connections.  I can see how some people end up with a separate headphone system.  I am interested in your balanced cable recommendation.