Category Archives: Articles

How Bass Traps Work

In this article, we’ll examine why we recommend putting bass traps (bass absorbers) in certain places in the room. We’ll explore the options and the benefits of each. The basics are simpler than most people think. First, some background. No discussion of bass traps and bass trapping would be complete without an explanation of modal […]

Why Isolation (Soundproofing) is Important

Isolation (also known as soundproofing) is important for a variety of reasons.  The most commonly recognized reason is to stop sound from bothering other people in the house or other people outside the room and the house/building. A more important reason to soundproof is to stop sound from getting INTO the room.  Why is this […]

Speaker Boundary Interference Response (SBIR)

SBIR (Speaker Boundary Interference Response) – This is a term to describe how the proximity of a speaker to a hard boundary (wall/ceiling/floor) will change the response, especially in the low end. This is something that not a lot of people understand nor consider when planning a room. Sound radiates from a driver in different […]

Diffusion is a Wonderful Tool – by Jeff Hedback

Diffusion is a wonderful tool in small room acoustics. OK, nice enough, but what is diffusion, why is it wonderful and where would it be wonderful in my room? Below I will answer those questions and offer effective application options. Mathematically-based/purpose-designed acoustical diffusors are young, only 30 years in development. The first commercially offered options […]

What Are Room Modes

Bass trapping first reflections in front of room

Room modes are caused by sound reflecting off of various room surfaces. There are three types of modes in a room: axial, tangential, and oblique. Modal activity occurs at frequencies which are directly related to the dimensions of the room. Axial modes are the strongest and many times, the only ones that are considered. Tangential […]

Room Setup Case Study

The following room setup case study was designed to illustrate how a typical room can be tested, designed and acoustically treated to achieve the best sound quality possible. The Room: – 13’7”W x 14’4”L x 8’H – 12’W x 5’H windows on the back wall and left wall – 6’W x 7’H sliding glass door […]

Early Reflection Points

Early reflection points or “mirror point” are semi-technical terms used to describe a phenomenon common to all enclosed spaces no matter the size:  direct sound from the loudspeakers will arrive at the listener’s ears before the reflected sound does. Early reflections are signals that have bounced off the walls, ceiling and floors and arrive at […]

How Diffusion Works

Diffusion is often a misunderstood concept in the audio field; so what exactly is diffusion? According to Webster, there are several definitions which relate to various fields. Let’s take a look at the generic definition and one more audio related. Diffusion, in general, is the movement of a substance from an area of high concentration […]