I realize that there have been no posts here for a couple of months, but I just did a back to back test of several laserdisc players, with two different video processors all feeding a Vizio VF551XVT LED/LCD 1080p HDTV. I had been using a Mitsubishi M-V7057 (Pioneer D704 clone) directly feeding my previous monitor (Vizio 720p plasma) thru composite. However, I was not initally pleased with the picture on my new screen, as it had a fair amount of noise and artifacts. I don't own an X0 or X9 so I can't add them to the mix, but what I used were upper mainstream players.
The equipment I tried:
Mits M-V7057 (CLD-D704 clone)
Panasonic LX-900 (two different ones)
Pioneer LD-V8000 (three different ones)
Faroudja NRS HD 16x9 720p fixed output setting (I would have like to try a 1080i output, but this processor was fixed at 720p. However, the Vizio has a very good scaler built in.)
I played with each setup quite a bit, and also tried both composite and s-video (where available) out of each machine.
In general, here is what I found:
1. As stated previously in this thread, the source makes a huge difference. The cleanest composite out, by far, came from the LX-900's. Next was the D703, the Mits, and then 2 of three of the LD-V8000's, and then one noisy LD-V8000. I played with the DNR on the machines that had it to get the best SNR that I could.
2. S-video from each machine was worse than the digitally recombined composite from the same machine. This appears to result from the comb filters involved. S-video ran from bad to horrid with crawling and hanging dots all over the place.
3. Both of the Faroudja processors added some noise to the signals, even with detail turned fully down.
4. The VP-100 adds a Delay function to help fix synch problems between the Y and C caused by the digital processing of the composite in the players. This helped the Mits and 703 somewhat, but didn't help the LX-900s at all.
5. ALL of the Pioneers exhibit what I call smearing to the right of brightly lit objects on screen, causing a sort of dark shadow. I've seen this in the past, but considered it a trade off for an otherwise high quality signal. Neither of the LX-900s have any of this artifact.
6. Neither of the Faroudja processors, not to mention the players themselves, had comb filters that stood up to the one in the Vizio. This really surprised me. I was using Toy Story as my source watching the same scenes over and over. There is one scene containing a venetian blind about 10 minutes into the movie that proved to be a real test. Both of the Faroudja processors had a tremendous shimmer in the blind as the scene panned across it. The Vizio processor held it rock solid. It didn't matter what source I used, the outcome was the same. The Vizio could be seen switching back and forth between a 3D and 2D filter as motion stopped and started, if I was right on top of the screen.
7. At first, I thought the LX-900s had a softer picture than the Mits and D703. However, close observation showed it was a lack of noise in the picture. I could get sharper images with less noise with the LX-900 by adjusting the set controls. BTW, the Vizio gives great access to video controls and picture improvement is quite noticeable if you play around with sharpness and noise reduction settings.
8. Since the LD-V8000s never go thru a comb filter internal to the machine, I was somewhat surprised by the noise that I saw as they were known as one of the better analog machines. These things are built like a tank with huge power supplies, rigid platforms, and the goodies that you'd think would make for a clean picture. Oh, well.
9. I also found that a THX transfer doesn't mean much as I saw great variation between titles in transfer to video.
10. The 1080p screen doesn't hide as many picture issues as my old 50" 720p plasma did. I've found this true with upconverted DVD's also.
Bottomline: I'm now using one of the LX-900s with a direct composite feed to the set. I'm not using a processor at all. Too bad Panasonic now longer supports them, as they are clearly better IMO than the similarly priced Pioneers of the period. I know that one of the specialty companies did some mods to the Panny and sold it as a high machine under their own name, and now I see why. Anyone want to buy a processor or two?