So, I've been upgrading my home theater. Some pictures:
It all started when my 12-year old Panasonic plasma television died. I hadn't been using the television very often, so I replaced it with a relatively cheap 55" Hisense U7N. But it turns out that even cheap TVs with HDR look really good compared to an old plasma suffering from burn-in.
So, I decided to get a 4K capable receiver, only to discover reconnecting my speakers that my small subwoofer had died at some point, too. Well, I had gotten that 14 years ago, so maybe it was time to get a real subwoofer, one that I would definitely notice if it died. And since the receiver supported Atmos, maybe while I was at it, I'd get some height speakers.
As it turned out, I found I really enjoyed the new subwoofer and Atmos, so over the course of six months or so, I slowly researched what else I could do to improve my home theater experience. Using a calibrated mic. Acoustic treatment. Tactile transducers. A second subwoofer. It was a real "if you give a mouse a cookie" situation, as my wife would describe it. And now here I am writing about my home theater journey, in case it is helpful or interesting to anyone.
Display
TV or projector? I prefer TVs due to their ability to be used in more lighting conditions. The main downsides are that they are much smaller and you can't place speakers behind a TV, unlike an acoustically transparent screen.
A 55" TV from my seating position at 7 feet occupies about 32 degrees horizontally. It's a little large for normal shows, which I rarely watch; about the right size for games; but a little small for movies, my primary use case, which normally target 45 degrees. I would go 65" or 77" next time.
OLED has the best picture quality but has burn-in issues and are more expensive than mini-LED. Most people will say there is a negligible amount of burn-in after 5 years, but I like to keep devices until they completely die and had my last TV for 12 years. I spent the last few of those years with a burned in image, so I decided to go mini-LED. A quick visit to the excellent TV review site rtings.com and I ordered the Hisense U7N.
Receiver
After discovering that the new TV looked amazing compared to my 12-year old plasma with burn-in, I decided it was time to get a 4K capable receiver. I went with a Denon AVR-X3800H.
I'm of the opinion that a receiver's effect on sound quality is pretty minimal so long as the receiver supports good calibration options and sufficient power, so it's mostly a matter of features. I went with Denon because I had the impression that they were slightly more reliable than Onkyo and Integra. The X3800H has the better Audyssey XT32 sound calibration and is the cheapest Denon with multiple independent subwoofer outputs. While I wasn't initially planning on getting multiple subwoofers, I had heard so much about the benefits of multi-sub and figured it would be nice just in case without needing to buy a separate device like a MiniDSP.
The choice ended up being very good for me as I did eventually get another sub, tactile transducers (which uses another one of the 4 sub outputs), and ended up really liking some sound calibration software called A1 Evo, which only works with Denon and Marantz receivers.
First Replacement Subwoofer
When hooking things up to the new receiver, I realized my subwoofer was dead. It was a small 8" Aperion Bravus I bought when I lived in a condo that only went down to 35hz at -3db.
Given that I didn't even know when it died and now that I live in a house, I decided to get a subwoofer with much more impact. I wanted it to go to at least 20hz and I wanted it ported because, while the listening area is fairly small, it was part of a much larger basement and ported subwoofers just have more output. I also needed it to take up less than 20" x 20" horizontally to give me more options for where it could be placed. The Hsu Research VTF-TN1 met all this criteria, though it turned out that I only need to turn its gain up to roughly 25%, so probably I could've gone with a sealed sub.
Experimenting with various locations, I found I was happiest with it nearfield, directly behind the main listening position.
So, how much difference does a real subwoofer make? A lot. I had some bass demos, and one of the clips is the Gas Station attack scene from Terminator Salvation. I was not very impressed with that scene with the old system--I guess it had nice explosions. What I hadn't realized was that my old system had actually failed the bass test and that you were supposed to feel the giant terminator walking around.
Speaker upgrades and Atmos
My speakers at the time was a 5.1 setup using the Aperion Intimus line. 4T towers for LR, 4C center, and 4B surrounds. They were really good for the price, but sounded a little thin at louder volumes in the larger basement.
I considered getting more Aperions, but doing more research, found that they don't usually measure that well. Objective measurements don't tell the full story as people don't hear the same way a microphone does, but speakers that measure well rarely sound bad and I appreciate the scientific approach. I wasn't sure about getting more speakers that measured poorly even if they did sound pretty good to my ears, but I also did not want to go through the hassle of selling my existing speakers and definitely didn't want to just throw them away.
So, I decided to take a risk and do a mix and match. I bought speakers from Ascend Acoustics, who publishes measurements. Normally, you want speakers all from the same brand so that, as a sound pans around, it doesn't shift in timbre. I got a pair of Sierra LX for the left and right speakers, a Sierra-2EXv2 for the center, and a pair of HTM-200SE2 for the front heights. I moved the Aperion 4Ts that were the previous left and right speakers to be surrounds, and the Aperion 4Bs to be the rear heights.
There is a small timbre difference after doing speaker calibration, but it doesn't bother me. Very similar to the timbre difference between the Sierras and the HTM-200SE2s, actually.
The Ascends are excellent and have no thinness problem.
How good is Atmos? Height position vs top position?
A common question is whether Atmos speakers are worth it. It's a pretty subjective question that depends on your priorities. I find well-done Atmos effects a lot of fun when they happen, but it is also true that this is only present for maybe 20% of content that I listen to and typically for a small portion of it. When it happens, though, it's really cool and it happens often enough that I consider it worth it.
I did experiment with the speaker position. The "heights" position have the speakers closer to the walls and less directly above you, whereas the "tops" position is more above you. I felt there were trade-offs and neither are clearly superior. There's often action happening on the screen that pans up, and heights just sound more natural when that happens. However, if there is something panning from front to back above you, or if it's something like rain on a rooftop, the tops are much more convincing.
In the end, I kept the tops position because it was more fun.
Tactile Transducers
So, I mentioned that being able to feel the action was game changing. However, I experienced two problems:
- Sometimes I wanted to feel more oomph, but if I turned the sub up, the audible portion of the bass was too much. I wasn't able to EQ things to get both tactile impact and not overwhelming bass.
- If I was sitting in one of the sides of the couch instead of the center, there was much less impact. Remember, the sub is directly behind the main seat.
Tactile transducers are devices that connect to your seating or platform and directly impart movement. I got a pair of Earthquake MQB-1s with an XJ-300ST amp and it solved both problems. The Denon X3800H receiver can be configured to set one of the subwoofer outputs to tactile transducer, which both allows you to set a separate high-pass filter and avoid using that output during calibration.
Taking Measurements
About 30% of the apparent sound quality has to do with the room, so I was curious how my system measured and whether there were any issues with the room. I also strongly suspected that having a wall on the right side but none on the left made for an imbalance.
So, I bought a calibrated microphone (Umik-1) and took measurements with this excellent and free software called Room EQ Wizard. I found the decay time to be pretty decent, with some room for improvement above the bass level, and a lot of room for improvement at bass frequencies.
Acoustic Treatments
Standard advice is to prioritize treating first reflection points and corners. I bought some 244 panels and a 6A Alpha Pro from GIK Acoustics online and found a couple of their tri-traps on Craiglist.
Treating the first reflection point in the side wall and the rear wall made a very noticeable difference in the sound. At first, it sounded pretty bad. Turns out, you should re-run speaker calibration or else things will sound weird. After doing that, things we much improved. The soundstage was made less wide, but imaging was considerably improved. Decay times improved some, but the perceptual effect was greater than what the graphs would imply.
Treating the ceiling did not affect the soundstage, but surprised me by also improving the imaging, even for content that did not use heights. It gave sounds a much more distinct vertical location. I thought that vertical imaging did not matter for non-Atmos content because there aren't speakers with different vertical positioning to image with, but it was nice to have things like voices sound like they come from a more distinct point than sounding smeared vertically.
Treating the corners made some small improvements to bass decay time, but I discovered later that it's much easier to treat bass issues with multiple subwoofers. I'm not sure I would recommend treating corners if you haven't tried multiple subs already.
Multiple subwoofers
If I was so happy with the Hsu and only had its gain at 25%, why would I want another subwoofer? Higher quality bass. It's hard to get an even bass response with a single subwoofer for a single seating position. It's impossible to do so across multiple seating positions. Things sounded bloated at the right side of the couch.
I got a Speedwoofer 10s Mk2 which only goes to about 22hz. But as my issues with peaks and dips were above 30hz, it did just fine to flatten the bass response across multiple listening positions.
Painting the room and changing bias lights
While I prioritize audio over video, I did find it distracting that the walls were yellow. So, I painted them the most neutral and non-reflective gray possible, a flat Sherwin Williams Westchester Gray.
I had also transferred some LED bias lights from my old TV to the new one, but found they were a little too bright. So, I got some MediaLight Mk2 lights, which are dimmable and have high CRI, and found they were an improvement as well. I find having bias lighting to reduce eye strain in high contrast situations.
A1 Evo
I had bought the Audyssey app but ultimately had trouble getting the bass dialed in so that there was both enough impact and no sign of bloat on some test tracks involving acoustic bass. I had heard about A1 Evo from forums and decided to try it out. While it was a little confusing figuring out how to get the right sweep measurements, eventually I figured out that you can just use the odd.wtf script and generate sweeps with the standard Audyssey mic hooked up to the receiver.
The results from A1 Evo sound better than whatever I tried with the Audyssey app and solved my bass bloat problem, so I recommend it.
Moving from 5.2.4 to 7.2.4
A little devil on my shoulder kept on whispering that 7 bed layer speakers might be noticeably better than just 5. So, I got another pair of HTM-200SE2s for use as rear surrounds an and AIYIMA A07 amp to power them.
There's not a lot of movie content where having sound directly behind you is important. I did find that surround effects seem more enveloping than in my 5.1 setup. For video games, however, rear surrounds are utilized far more actively where there can be a lot happening behind you and it's useful to get accurate positioning information.
Overall, it's nicer but not a big deal compared to properly set up 5.1.
Content Playback
Originally, I bought a Panasonic 420 because I figure since I did not have an OLED, probably I wouldn't care a lot about Dolby Vision. The internet suggests that actually it's the opposite, where the worse the TV is, but more Dolby Vision is beneficial. At any rate, I almost never actually play physical discs because I saw how many people complained about minor scratches messing up their 4K so I pursued a way to transfer them to disk. And I discovered later that I don't really care about Dolby Vision over normal HDR.
I ended up getting an Ugoos AM6b+ and installed CoreElec. It's one of the few players that supports all versions of Dolby Vision and lossless audio. I stream from my Synology 923+ using Eero Pro 6E with wireless backhaul. I had initially tried very hard to get it working with my FireTV Stick and thought I did not have enough network bandwidth and got an ethernet adapter and a long cable, but it turns out the FireTV Stick just isn't powerful enough to handle really high bitrates.
I rip discs using MakeMKV and a Verbatim 43888 that I bought from Amazon.co.uk.
What's next?
At this point, the home theater is pretty much complete. I might get some diffusion panels for the ceiling and back, but they're more expensive than absorption panels. Whenever my current TV dies again, I will go for a 65" or 77" instead.
Appendix
Equipment list
Visuals
- 55" Hisense U7N
- MediaLight Mk2 bias lighting
Audio equipment
- L/R: Ascend Acoustics Sierra LX
- C: Ascend Acoustics Sierra-2EXv2
- Ls/Rs: Aperion Intimus 4T
- Lsr/Rsr: Ascend Acoustic HTM-200SE2
- Amp powering sr: Ascend Acoustic HTM-200SE2
- Tfl/Tfr: Ascend Acoustic HTM-200SE2
- Tbl/Tbr: Aperion Intimus 4B
- Receiver: Denon AVR-X3800H
- Sub 1: Hsu Research VTF-TN1
- Sub 2: RSL Speedwoofer 10S MKII
- Tactile transducers: 2x Earthquake MQB-1
- Amp powering transducers: Earthquake XJ-300ST
Room treatment
- Sherwin Williams Westchester Gray flat paint
- 5x GIK Acoustics 244 absorption panels
- GIK Acoustics 6A Alpha Pro combo absorption/diffusor panel
- 2x GIK Acoustics Tri-Trap
Sources
- Ugoos AM6b+ with CoreElec, streaming from a Synology 923+
- Panasonic DP-UB420
- FireTV Stick 4k
- Nintendo Switch
- Asus ROG Flow x16 laptop
Key trade-offs
Spectrograms
You can see things are more even above 80hz, which is where the crossover is set. But overall, I found it difficult to correlate the graphs with the actual effect.
How much is good enough?
This is a personal question. Not just due to personal taste and budget, but also simply physical limitations. There's no point in getting more if you can't hear the difference unless you are trying to impress others for some reason. I used to be able to distinguish in a double-blind test the difference between a well-encoded 192kbps MP3 and a lossless track in college, but I can't do so any more. Even if you can hear the difference, you may not care about some types of differences.
But it's a hassle to audition equipment. How will you discover your limits without spending too much time and money? How can you figure out what you care about?
One trick is that headphones are much more convenient to try out and cost about 10x less for roughly the same quality of sound. You won't get really get body-shaking bass impact, though.
As for figuring out what you care about, ready some testing tracks and clips that are a combination of your favorites that you are intimately familiar with and reference material that others agree are high quality and can stress some particular aspect of video or sound.
Testing Material
Standard advice is to use what you are familiar with, but what if what you are familiar with isn't particularly good for evaluating things? It can be helpful to learn about what others use and what specifically they look for. I used a lot more than just these, but some that I thought were particularly helpful:
- "Amaze" Dolby Atmos trailer. Does the sound of the bird flying seem connected and consistent as it pans across the room? Does the thunderstorm have impact without getting muddy?
- "Train" by Holly Cole. Does the bass sound full without getting bloated?
- First ship battle from Master and Commander. Do you feel the cannon fire?
Video Playback
While I purchase a lot of discs, I rarely use the actual Blu-Ray player. I got a bit paranoid about disc scratches and instead use MakeMKV and a Verbatim 43888 to rip the discs to my NAS (a Synology 923+). For a while, I was trying to get my FireTV Stick 4k to play back the files, but it was choppy. I thought it was due to poor network bandwidth, so I upgraded my wireless to Eero 6E routers, which improved but did not solve the playback problems. Eventually, I eliminated the network as the bottleneck via an ethernet adapter and a long cable and purchased an Ugoos AM6b+. It's the most common device that can playback all Dolby Vision formats and lossless audio, though it turns out that I don't really care about Dolby Vision over standard HDR.