I haven't compared them, but I would guarantee there is a huge improvement. The "64" is very old technology and as good as the DT10 is, the 64 is the weak link.
At one point, I was going to upgrade my Studio to the 64 (at a great price), but I contacted Krell and was advised not to do that. They told me that the sound difference was slight and that the 64 was not as reliable and expensive to fix. I followed their advice.
Years later, wanting to go for SACD, I bought the Marantz SA14. Properly set up, it blows away the Krell in all aspects.
If I could afford the 505, I would buy it!
I have owned a lot of Krell over the years, and with the exception of the Marantz, use only Krell now. I have always found that the newer products always sound better than prior models.
Richard
At one point, I was going to upgrade my Studio to the 64 (at a great price), but I contacted Krell and was advised not to do that. They told me that the sound difference was slight and that the 64 was not as reliable and expensive to fix. I followed their advice.
Years later, wanting to go for SACD, I bought the Marantz SA14. Properly set up, it blows away the Krell in all aspects.
If I could afford the 505, I would buy it!
I have owned a lot of Krell over the years, and with the exception of the Marantz, use only Krell now. I have always found that the newer products always sound better than prior models.
Richard