Fish, the automatic equalization Pioneer and now Yamaha makes available should be an important, maybe decisive, factor. Since it's been discontinued you may have trouble finding a new 45TX. There're a few companies advertising factory refurbished 45TXs for around $530. The 53TX is essentially identical except that a couple of rarely used ports(USB,RS-232C)aren't present. On paper the 1400 would appear to have an even better equalization provision, but it's brand new and no reports are available.

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Enjoy the music, not the equipment.