OK. Here is some injections of things based off of this post. I focused on main points... (Sorry about the blue color. I didn't know what would work best since different people like different colors or see different ones better than others.)
Originally Posted by Soupy1970
...the SF did look much better to me
on the Monster poster comparison but it was just black and green. Please continue on and then see my photos at the bottom and additional comments.
My thing is the ease of use. There is no problem with wrinkles using SF that I have come across. That's not to say a sloppy packaging could cause for the use of a wrinkle spray (easy to use by the way). There is plenty of stretch to the SF but not overly stretchy to cause a problem with distortion. I agreed that it just takes steam or wrinkle release spray for SF.
... I feel (my own opinion) that the only plus is that PK is easier to breath through, but that doesn't make the SF a bad Choice for acoustics. It has been noted that it is easier to blow through SF than fabric offerings from the professional acoustic panels manufacturers. Nobody said SF was bad for this, but it is harder to blow through than the original Kona as documented already in this thread. Also, I was the one to mention that it was better than some other fabric samples from the "pros" (ATS specifically), but it was for their micro-suede material. That stuff let zero air through and it seemed like a total failure from the acoustical "blow" test, so I wouldn't say that this statement validates SF as being great or anything. I still think that SF DOES perform fine, but wanted to qualify your statement with some background for those jumping into the thread at this point.
Nick and I are both just speculating which is easier to use. TRUE We both have had great success with the choices we went with and it is hard to speculate what others would prefer.
... In all honesty it's just opinion and not some big scheme to get someone to buy one fabric over the other. ABSOLUTELY 1000% agree with this.
... If you are making just a couple and take your time it's probably not a big deal. TRUE
Especially if you don't have a lot of text lines to keep straight. If you are making several posters though it could mean a couple hours shaved off the build time. I don't know of anyone else that has used several different fabrics, so I think I have a good grasp on why I think one is easier to work with than the other. This is still opinion based off of what has worked for you. The statement about saving *hours* is quite excessive, especially when the PK that is so terrible in your opinion can be easily fixed, either small parts, or even the entire poster if the whole thing is skewed with just a couple more staples in mere minutes tops.
Here is an image to recap the actual imagine comparison by eye of a simple black and green poster. Sf is on the left and PK on the right. First image has no flash and the second does have flash on. Simple snapshot using Samsung Galaxy S4 phone. What you fail to remind people is that we both agreed that the PK has more "shine" to it than the SF so in a bright room, laying flat on a surface PK does look a lot lighter, but it was also agreed that hanging on a wall without any light shining straight down on it (not talking flash), it was much closer with SF having slightly deeper blacks. You can also see that the PK side of your pictures is more directly under whatever overhead light you have since the wood table in the background is quite a bit darker on the SF side and a lot lighter on the PK side. The flash image also has the flash going off ever so slightly more angled towards the PK side as evident by the light reflection off of the wood table in the foreground and the inconsistent shading of the PK (hot spot in the lower right). Again, not saying that you did anything intentionally incorrect, I just wanted to use that information to show that the PK has a little more sheen to it. The SF has some too, but not much. I've added my one photos below that both agree and disagree with your photos.
And from my post above...
PK = Performance Knit
SF = Silky Faille
PK has more accurate colors TRUE
SF has slightly darker blacks TRUE
PK passes more air, which in means that it is better acoustically TRUE
SF is significantly more difficult to blow air through, but I still believe that it will work fine because it is on the level of the original Kona Cotton that was tested and used for a while as the original fabric. TRUE
PK stretches a lot easier, which means easier to get wrinkles out, but also means that the image can be overstretched easily and thus takes a little more effort to keep things straight. The benefit of this is that it is also easy to make adjustments by adding more staples to the right spots. TRUE
SF is more rigid which means to get wrinkles out, you will need to steam the fabric, or spray with a fabric wrinkle release product. If you pull too hard to get wrinkles out, it too will distort and requires more muscle to straighten it if you do get distortion. It is, however, less prone to distortion as long as you don't "over muscle" it. TRUE
People here have used both and have had great success with both. TRUE
And now my own photos. These were taken on my new Galaxy S5 and are completely unaltered. The one with the 4 entire fabric samples was taken last night, the others about 15 minutes ago.
Kona Cotton - Performance Knit - Silky Faille WITH flash at a slight angle.
Kona Cotton - Performance Knit - Silky Faille NO flash at a slight angle.
Kona Cotton - Performance Knit - Silky Faille WITH flash straight down.
I switched the following two in order to get the SF into the middle instead of the PK just for thoroughness.
Kona Cotton - Silky Faille - Performance Knit NO flash straight down. Notice the color deviation in the SF. While it isn't that dominant in real life, it is there enough to show up in the photo. This is inaccurate color.
Kona Cotton - Silky Faille - Performance Knit WITH flash straight down.
Performance Knit (top) - Silky Faille (bottom) NO flash
(AVS rotated the picture sideways for the next one, so "sideways" orientation is below - Kona Ultra off to the side, but not included since it isn't available)
Performance Knit - Kona Cotton
Performance Pique - Silky Faille WITH flash
As you can see, some images, especially the straight down shots, the SF seems to be noticeably better, at an angle you could argue that the PK looks better. With the two fabrics side by side in the 2nd to last image (where I focus on just those two and their black squares) they look pretty even.
You can't tell too much from the final picture, but the color of the PK is more accurate for more of the colors in the sample than any of the others. In real life that probably doesn't matter either as who is going to have a color swatch next to your posters to see if they are correct. I needed them to be since I was color matching pain and other colors in my theater room, so it was important to me. It might not be to you.
So there you have it. This *should* be the end all, be all on the subject of SF and PK. They both work great and look outstanding, especially against the original Kona product that people were stuck with for so long. They should both function well as acoustical fabric, and blacks/color accuracy really probably doesn't matter for 99.5% of the people doing this, so that is a wash. Wrinkles are easily removed with either product, they just take different methods... Either lightly stretch the PK, or apply some steam or wrinkle release for the SF. Easy as can be. The real only remaining debate is consistently about the easy of getting them mounted to a frame easily and accurately. SF lends itself to end up straight to begin with, but is a bit more work to fix something if it does end up crooked or out of alignment. As mentioned by another very recent post from someone else, SF does NOT stretch much at all, no matter what the size. PK should only be stretched a small amount or you could end up fighting wavey lines, however if you do end up with something out of alignment, you can just stretch that area either to pull more away from the front, or to stretch it more away from the back and add another staple and you are good to go.
I think that Soupy and I would both say that having a helper, while not required, would be a big help. Also, there are recommended methods for stapling canvas to a frame that can be googled that might help some people. That worked for me, but might not be required depending on your skill/luck/etc.
I'm out.... You all have a great one and remember, just pick what you think would work best for you and enjoy it. It will be awesome both visually and these panels can REALLY help acoustically with any listening space.