If you have many cassettes like i do some are live recordings a Nak Deck is worth the investment.
Out of the decks mentioned i would go for the DR-1 simply because it has more adjustment options.
i have owned a Nak 550 battery powered portable.
It was a great deck and ahead of its time.
i made many live recordings of my band and they always came out great.
However in my opinion The Nak ZX9 was the best deck ever made.
It was very adjustable and built like a tank.
That would be my choice.
Out of the decks mentioned i would go for the DR-1 simply because it has more adjustment options.
i have owned a Nak 550 battery powered portable.
It was a great deck and ahead of its time.
i made many live recordings of my band and they always came out great.
However in my opinion The Nak ZX9 was the best deck ever made.
It was very adjustable and built like a tank.
That would be my choice.