How to reduce echo in a room. Echos are delayed sounds caused by sound waves bouncing off a hard surface so that you hear the same sound again. The delay in delivering your message can be frustrating, especially if you are talking to someone other than yourself.
To minimize annoying reverberations caused by echoes, one should decorate the room in a way that absorbs anything reflective such as mirrors and glass pieces, depending on whether or not it is causing the problem.
It may be helpful to place heavy furniture throughout the room in order to mask out any other sounds.
How to reduce echo in a room
Reduce echo in a room by covering the floor. Carpets and rugs do more than provide soft padding for your feet, they also help muffle sound bouncing off otherwise hard flooring surfaces and help cut down on unnecessary audio effects.
Cover the Walls and Windows. Wallpaper or painting along with curtains (and even furniture) can be used to give a room added texture, pattern, color, and contrast that reduce the impact of every reflective surface in a room. Fill Rooms with Furnishings. Install Acoustic Panels.
Covering the Floor
Hopefully, you will have time and money to place area rugs in rooms that can use a little more softness. Area rugs work well with hardwood, tile, or another surface that generates too much echo because they give off an ambiance of relaxation, warmth, and comfort into an otherwise austere-looking space.
Carpeting is also great for this reason but it tends to be much more expensive because you’ll need to rent a steam machine to put the wall-to-wall carpeting down otherwise there will be some parts that never get steamed properly and then the segments stick out like a sore thumb.
Time and patience are two things we don’t generally have but if you want the best floors possible at the cheapest price possible then go with wall-to-wall carpeting.
Cover the windows and walls
Wall and window coverings, such as curtains and rugs, help absorb sound that bounces off of hard surfaces like walls. Heavy curtains and lined draperies are great for more tightly controlled sound, also reducing echo from within the house as well as outside.
Keep in mind that decorative artwork framed within the glass can reflect sound if it is not carefully considered when envisioning your design plan.
Fill rooms with furniture
In a room that may potentially be filled with echo as a result of sound reflection, soft furniture and accessories can cut down on the reverberating sounds.
For example, couches and plush chairs work well to mold and fit the contours of our bodies in contrast to stiffer vinyl or leather chairs that often reflect sharp, stinging echoes throughout a space.
Similarly, bookshelves lined with tomes or any other decorative items would help absorb sounds so that even if an individual reading in the corner decides to yell at full volume, it’ll still be relatively muffled.
Installing acoustic panels 
It is not practical for all applications and décor considerations, but soundproofing is a smart option when you need to reduce reverberations.
Installing an entertainment system in the main room of your house or renovating the home to create a dedicated recreation room are two examples.
Also, when there’s too much echo in your television studio, studios, and other large spaces designed to be used for any sort of sound recording or broadcast activities.
The problem with sound reflection can sometimes delay editing since the editor will have to boost up the volume just to overcome the reverberating effect being produced by poorly isolated rooms.
You might also find that with open-plan rooms you are likely to have echo problems if there aren’t walls or partial walls between the entertainment area and another room such as your office space.