There is some doubt about pronunciation of the word booths. Dictionaries give two variants for singular of it . Those are
[bu?ð] and [bu??]. ?orrespondingly the plural for them should be [bu?ðz] and [bu??s]. But having some trust to my ears I got [bu?ðs] on the site
www-howjsay-com. Am I right about my ears' belief and this time there's only some exception to the rule "after voiced - voiced, after unvoiced - unvoiced" or something else?