Hey Brian,
I am really sorry for the delay of this reply,
I've global search around in Google and see how to get that <enclosure> tag content link, then I use this method to get that mp3 link, you can take a look of my attached screenshot below about the imported result.
// Trying to get the link from the enclosure tag
foreach (@$item->get_enclosures() as $enclosure) {
$enclosureLink = @$enclosure->get_link();
}
If you would like that mp3 link url, you can download my attached file and replace into
JoomlaFolder\administrator\components\com_easyblog\includes\feeds\adapters\mapper.php
and see how it goes.