General American English speaker pronouncing "aback" to illustrate unaspirated bilabial voiced stop sound.
<a href="https://en.wikipedia.org/wiki/User:Dabblequeen" class="extiw" title="en:User:Dabblequeen">Dabblequeen</a>
21 January 2018 (original upload date)
<span class="int-own-work" lang="">Own work by the original uploader</span>