I looked into it a bit more since I posted that last message and I have that DTS issue with popping on occasion (rare)... sounds like a bullet firing, I'm surprised I haven't blown speakers. I'd love to do the DTS update but there really isn't much newer info out there. I found a thing on AVS from 2008 and all the links were dead.
I have located the DSP update file on one of my computers. PM me an email address and I can send it to you.
Re: TX-SR705 popping noise - firmware upgrade
Postby ForumMod3 » Sun Jan 18, 2015 6:17 pm
Send an email to Onkyoadmin@us.Onkyo.com with your receiver model number brief description of the problem and your contact information (name address phone number) and you will receive an update to address your issue in the mail.
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si possis, recte, si non, quocumque modo, rem.