If we consider a scale of 1-10 (X) with 1 being the easiest, and 10 being the most difficult, here is a player breakdown:
X | Brand/Model | Specific Install Notes | 4 | Denon LA-2500 | All jumpers, nothing to remove | 3 | Denon LA-31001 | Straight-forward, nothing to remove | 3 | Marantz LV-5001 | Straight-forward, nothing to remove | 4 | Marantz LV-5101 | All jumpers, nothing to remove | 3 | Mitsubishi M-V60221 | Straight-forward, nothing to remove | 3 | Mitsubishi M-V70251 | Straight-forward, nothing to remove | 7 | Panasonic LX-6001 | Difficult soldering, nothing to remove | 7 | Panasonic LX-K7001 | Difficult soldering, nothing to remove | 7 | Panasonic LX-9001 | Difficult soldering, nothing to remove | 3 | Pioneer CLD-521 | Straight-forward, nothing to remove | 3 | Pioneer CLD-S201/250 | Straight-forward, nothing to remove | 3 | Pioneer CLD-M301/350 | Straight-forward, nothing to remove | 3 | Pioneer CLD-M401/450 | Straight-forward, nothing to remove | 3 | Pioneer CLD-D501/5501 | Straight-forward, nothing to remove | 4 | Pioneer CLD-D503 | All jumpers, nothing to remove | 7 | Pioneer CLD-D5042 | Remove mainboard, some difficult soldering | 8 | Pioneer CLD-D5052 | Remove mainboard, some difficult soldering | 3 | Pioneer CLD-D701/7501 | Straight-forward, nothing to remove | 7 | Pioneer CLD-S104 | Remove mainboard, some difficult soldering | 6 | Pioneer LD-838D | Difficult Soldering | 5 | Pioneer CLD-M90 | Slightly Difficult Soldering | 4 | RCA LDR-610 | All jumpers, nothing to remove | 7 | Sony MDP-500 | Remove one board. | 3 | Toshiba XR-W751 | Straight-forward, nothing to remove | 4 | Toshiba XR-W90C | All jumpers, nothing to remove |
Legend:
1 - These players include a TOSLink Digital Output already.
2 - These players include an AC-3 RF Output already.