When I bought my first FT817ND I upgraded the build in speaker with a Massoth 8241020. Which gives more dynamic and details (especially in the lows and of the range).

Recently I got a second FT817ND and wanted to upgrade it also. But found out that Massoth 8241020 is replaced by Massoth 8241021 Visaton Lautsprecher K57F. So I bought one to install it it in the second FT817ND.

This video showing the difference between the 8241020 (left orange display) and the original speaker (purple blue display) befor the modification. The 8241020 is much better then then original speaker

After this video I replaced the original speaker from my second FT817ND with a Massoth 8241021 Visaton Lautsprecher K57F and did a side by side compare of the 8241020 and the 8241021. See : [ Ссылка ]

More info on my blog : [ Ссылка ]

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