Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Do these do a good job a suppressing human speech? I also want something to suppress noises that my wife makes around the house so that I can read.
Document: These noise reduction headphones worked great. I bought a pair for myself and for my husband. We flew to South Korea which is a very long flight and were so very glad to have these. Not only did it block out the engine roar but also the noise (children) around us. the only thing negative was they did get snug on the head (below the ears on my jaw line) after wearing them for hours. but otherwise they were comfortable and did the job well.
These are good headphones especially for the price. They are pretty equal in quality to the more expensive brands. The battery cover on the side doesn't want to stay on' but that is something I can over look.
My work place has an average 55dB noise level. So noise cancelling ability is most important to me. I want to use the headphone without listening to music.I think this headphone's low frequency noise cancelling ability is bad. I can still hear the low frequency vibration sound.I checked the Specifications, it says "Active Noise Cancellation - Up to 18dB between 150-400Hz". I do know much about sound, but based on something I read, low frequency noise is below 150Hz level.
Peltor H10A could reduce 36.6dB at 500Hz. (you can find this in the manual)QC15 could reduce 20dB at 200Hz , 10dB at 50Hz, 10dB at 300Hz. 5dB at 500Hz (This is just reasonable guessing from something I read.) I think it is really good. Complete noise cancelling is unrealistic.But is "so far the best" good enough for your exceptions? Personally I don't think so.
I had a Plane Quiet headphone for about 15 years and loved it. Unfortunately, the ear muffs disintegrated after all that time, so I bought a new one. The same great performance was still evident, but when I moved my head quickly, there was an odd sound, like something was loose inside. I returned the headphones and they were qucikly replaced with a fully functional set. Then I decided to buy another pair for my wife.
When I put them on it was like I was at a rock concert with &#34;silent&#34; pressure in my ears, Similar to being next to the Ginormous Speaker blaring, but I could still hear all the ambient noises around me only slightly muffled due to the headphones over the ear. Not the noise canceling. I was NOT impressed and would not recommend to anyone.
I then realized that by putting gentle ( I mean VERY gentle pressure, less than you would from having your head on a pillow) against the cup causes what I would describe as a short in the wiring in the cup. You get a lot of cutting in and out and crackling.. I understand that these are cheaper headphones but something like this just points to very bad manufacturing.Still haven't decided if I want to chance a replacement.
I wanted something to kill the plane cabin noise and this worked well. It does NOT give you total silence. Only that certain decibel of noise that happens in a plane- that whoosh sound as I call it. I could still hear the engine noise slightly and people talking softly. I tested this ahead of time with my noisy air conditioner at home. It killed the whoosh sound but not the buzz sound that it periodically makes.
My first pair of noise canceling head phones so not much to compare to, but I love them and they have great sound quality and do a very good job of canceling background noise.
I bought two pairs of these for my wife an I on a 4-hour plane ride. I had no idea how they would perform as I have tried a couple of "discount" noise cancelling systems and nothing ever came close to the premier Bose system you drool over in the store but cannot afford especially if you do not travel that often.NOISE CANCELLATIONThese? Oh they are good! Both of us were very impressed.
Answer: You will hear muffled talk and other noises.  What these are more known for are cutting out that decibel sound that a plane engine makes.  I wore these in the house to cut the noise of a noisy air conditioner and I still heard it, which depressed me.