Denon low end CD players - tweakable?

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Hello all

I've been searching for a cheap CD player primarily in order to experiment NOS mods and not only, but haven't been able to find all the necessary info in order to decide. One of the first things that count is the posibility to disable or bypass the digital filtering, which is not possible with all IC's.
I haven't found any info regarding the digital filters used inside Denon low end CD's like DCD-690, DCD-860, DCD 480, 615, 900, 435 etc. There seems to be a bunch of them available.
Anyone has any idea which types of digital filters are used inside of these?
Thanks.
 
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