I'd love to hear those ELAC Adantés they're discussing in that first video. If I had to replace my Thiels, those would probably be the first speaker I Listened to.
I would try and stay away from mixing brands of speakers with the exception of the subwoofer. You want to stick with the same brand and line if you can but mixing brands can lead to a mixing of the voice from speaker to speaker which would be the timber of the speaker. Like someone else mentioned definitely do not mix speakers across the front channels. No problem with your receiver and Denon makes nice receivers so I would match your power to what ever speakers you get since you have already locked down your receiver. B&W and Klipsch are both good for home theater and plenty of people use both but they are different animals as Klipsch uses horn tweeters and B&W does not. That being said and because the actual sound from both differ I would make sure you also look into SVS and especially ELAC by Andrew Jones who is a well known speaker designer and the ELAC's are well designed and are not real expensive a great bargain for what your getting. If you live to far from retailers try to listen to as much as possible and make up reading as much as possible. Try to stay away from consumer reviews and take them with a grain of salt like reviews from Walmart and Best Buy or even Crutchfield. Have you listened to Klipsch speakers before? The highs can be on the bright side compared to other speakers as can horn tweeters be in general. Also after running Audyssey go back in and set your speakers to small! Unless you have large bass drivers that can handle deep bass on your left and right IMHO set them to small.
As far as your tv I would suggest making sure it does both HDR & Dolby Vision and make sure your 4K blu-ray player is compatible as well. I have a Samsung which is not that bad and has worked out well. But I would look at the Sony and Panasonic player but the Oppo is the best but just be warned that Oppo is shutting down if they have not stopped production already. Oppo is also alot more expensive than everything else but this is why I would stick with checking out the Sony or Panasonic player.
I would at minimum if you want good solid sub in your home theater I would go with at least a 12" sub maybe a 15" sub. I wouldn't go below a 12 and after living with the subwoofer for at least 6 months and after hearing a decent amount of content with good low frequency content reevaluate if the one subwoofer is enough and consider at that point if you need to add a second as that can make a big difference and a better performance in your room. If your receiver doesn't have dual rca outputs for two subs don't worry you can get a rca splitter to hook up dual subs later. Keep in mind to take any of these videos with a grain of salt. And one thing never take the audio presentation as a representation of what the speakers sound like because it will never sound like the way it did in the room where the video was shot. At the end of the day you are hearing your speakers not the speakers on the other end!
Just wondering if your a critical listener like I am? If yes then your choice in speakers will be critical!
I hope this helps you achieve your goals! I like big full sound and it is my opinion that to get that kind of room filling sound nothing beats larger speakers! You do not need them as big as I have them but I also have another reason for hanging onto my speakers and that is they belonged to my father and the sound is incredible.
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Hopefully in the near future these Altec A-7's will get a high gloss black lacquer finish or back to the original grey. If I end up moving and can not keep these then I will be looking at B&W, Klipsch, SVS or another tower speaker. But unless I change my mind about the center channel I have I will most likely stick with moving to all B&W's. My other choice is to pair Klipsch to the Altecs or just flat out change everything to Klipsch or something else.
I don't know why you want to complicate things by using DIY for the surround. BTW, in a 5.1 setup, which it sounds like you are doing, the surrounds go on the sides, not the rear. Common misunderstanding. If you like the B&Ws, just get B&Ws all the way around, using bookshelf models for surround. Plus, surrounds really should be higher than floor standing speakers. I know people use floor speakers for surround, but it's not what I'd recommend.
AhhhDoing DIY speakers is not an easy task and getting the performance out of them is even trickier so I have to agree just stick with the B&W's and IMHO you will be happier in the long run and most likely even in the short term as well. Also I would run the surround speakers for the back. The only reason for running towers around the back is for surround music formats like DVD-A or some SACD's. Otherwise I wouldn't run towers in the back as surrounds do not require large towers to be used. The B&W's with an SVS sub should sound really good!
Your room really isn't that big. You want power and capable speakers, but I wouldn't bother with floor standing speakers outside the L&R. My big HT is 20x25x8, so not a tremendous difference from yours. My personal recommendation would be to consider external amps, at least for your front three channels, or full separates (preamp/amp combination) instead of a receiver. The alternative is to use a receiver with preamp outputs, and an external amp for the front three channels, and let the receiver power everything else. I think you should aim for a 7.1.4 Atmos/DTS:X setup. Don't get suckered into using two lesser subs instead of spending the same $ on a single, better sub. A single $1500 sub will always out perform two $750 subs.
FWIW, I use separates, aka a preamp and three power amps in my system, which is currently 7.1.2, headed for 7.1.4
Yeh definitely never said size meant thatThat SVS should be a good choice.
Which B&W speakers are you considering the most?
As far as an amp, you'll probably need to add one if you want to go 7.1.4, since virtually no receiver has 11 channels of amplification, so it just makes sense to me to add a powerful one for the front three channels. That takes a lot of strain off the receiver and gives you maximum kick where it's needed the most. Take a look at the Emotiva XPA-3 when the time comes. One warning, it's a big sucker.
I get a lot of argument over external amps, almost always from people who have never used them, but your speakers will determine how important that is. With Klipsch, it's not needed. With most better speakers, it is a benefit. The fact is, you virtually can't have too much power, but you can have too little. I'm also definitely a "believer", that amps do sound different.
Finally, the size of speakers has nothing to do with how "crisp" the sound is. Large speakers just don't make a lot of sense for surrounds, and they're mainly a negative, because surrounds should be at least at ear height, and preferably a little above.