Plug in DAC into main in or to cd inputs of an integrated amplifier

Thinking of a basic dac with Bluetooth. I looked at a few.

Currently top contender is creative x7
260$ on Amazon

https://www.amazon.com/gp/aw/d/B00Q3XLGLU/ref=ox_sc_act_image_1?smid=A286IZ33TR5AUQ&psc=1

Has burr brown dac

There is also this one

Audioengine B1 Bluetooth Music Receiver (2019 Version) B1 B&H


And volume control. So it's sort of a pre amp already

I have few nakamichi ta and Sr series. Some come with pre-out and main in jacks.

What's the issue if you have 2 pre amps on signal path

Say
1) creative x7 -->cd inputs of nakamichi--> speakers

2) creative x7 --> main in of nakamichi--> speakers

Any issues or adverse affects of either pathway

If you have other dac recommendation please let me know
Need USB connection to Android, Mac, pc and bluetooth