a little help with understanding/matching my components..

Hi all,

Longtime reader and music/gear lover, but never needed to ask your help as most of it is already been discussed.

I think i have a question thats not been asked before, at least not with these components.

First the components i use are:

B&W Matrix 804 speakers (http://bwgroupsupport.com/downloads/specsheets/bw/Matrix%20804%20InfoSheet.pdf)
B&W MPA1 monoblocks
(http://bwgroupsupport.com/downloads/specsheets/bw/MPA1%20Specifications.pdf)
Resonessence Labs Herus+ dac
(http://www.resonessencelabs.com/herus-2/)
MIT speaker cables
Mogami W2534 interconnect
MacMini/Audirvana+ source(i use the digital volume control of the Herus+)

Question 1: do my amps and dac match well or do i have some impedance mismatch? or do i need a preamp, sound wise i think it works beautiful but i'd like to know if the dac output is a serious bottleneck. I am saving for an RL invicta, but that's gonna take a while.

Question 2: I have finally found a B&W Bass Alignment Filter for a nice price and now i am wondering if i run in to problems if i put the BAF between my dac and power amps?

As you can see i have included links to the specs of the components, i understand the basics but most of it is out of my league. That's why i hope you can help me understand.

Thanks

P.s. i hope i posted this in the right sub, admins feel free to move it to the right sub if needed.