A ranar 25 ga Afrilu, 2006, Godsmack ya saki kundi na huɗu na studio kawai mai suna IV, wanda ya biyo bayan yawon shakatawa wanda zai ci gaba har zuwa Agusta 2007, mai taken "The IV tour". Erna ya samar da kundin kuma masanin injiniya Andy Johns, wanda aka sani da masanin injiniya Led Zeppelin's Led Zeppelin IV. An saki kundi na farko daga kundin, "Speak" a ranar 14 ga Fabrairu, 2006. An fara bugawa a lamba daya a kan Billboard 200, yana sayar da kwafi 211,000 a cikin makon farko. An ba da lambar zinariya ta IV. Kungiyar ta rubuta waƙoƙi arba'in don kundin, amma jerin karshe na da waƙa guda goma sha ɗaya, Larkin ya yi sharhi, "Ƙungiyar Sully da hangen nesa na Sully".
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