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DIY Plans For My Carnhill Stereo Line Transformer Box

2017 PSD Study Guide

Microphone Choices At MI

Laws For Engineers

Understanding Compressors/Compression!

Real Traps Acoustics Special Student Offer

AES Drum Recording Seminar

Drum Miking Tips

Tracking Session Ideas

Audio Terms Glossary

SB1000 Furman UPS

M1500 Furman UPS

KRK ERGO Room Correction System

Creation Audio Labs MW1 Studio Tool

Line 6 Mobil Keys 49-key USB/iOS Controllers

DB500 Hot Wires Direct Box

Little Labs Distro

Sennheiser Evolution Microphones

JZ Microphones' Pop Filter

Three Best Books About The Beatles!
Their Lives And Times

Their Musical And Recording Equipment

Their Creative Process In the Studio
Music Production, Software, Gear, Sound

Axial, Tangential, and Oblique Room Modes
Nodes and Antinodes
Axial Room modes involve two parallel walls.

Tangential modes involve four surfaces (two sets of parallel walls) and have around half the energy of the Axial modes.

Oblique modes have about one quarter of the energy of Axial modes and involve all six surfaces--parallel walls, floor, and ceiling!

What are Nodes and Antinodes?
One characteristic of every standing wave pattern is that there are points along the medium that appear to be standing still. These points, sometimes described as points of no displacement, are referred to as nodes. There are other points along the medium that undergo vibrations between a large positive and large negative displacement. These are the points that undergo the maximum displacement during each vibrational cycle of the standing wave. In a sense, these points are the opposite of nodes, and so they are called antinodes. A standing wave pattern always consists of an alternating pattern of nodes and antinodes. The animation shown below depicts a rope vibrating with a standing wave pattern. The nodes and antinodes are labeled on the diagram. When a standing wave pattern is established in a medium, the nodes and the antinodes are always located at the same position along the medium; they are standing still. It is this characteristic that has earned the pattern the name standing wave.

Standing Wave Diagrams
The positioning of the nodes and antinodes in a standing wave pattern can be explained by focusing on the interference of the two waves. The nodes are produced at locations where destructive interference occurs. For instance, nodes form at locations where a crest of one wave meets a trough of a second wave; or a half-crest of one wave meets a half-trough of a second wave; or a quarter-crest of one wave meets a quarter-trough of a second wave; etc. Antinodes, on the other hand, are produced at locations where constructive interference occurs. For instance, if a crest of one wave meets a crest of a second wave, a point of large positive displacement results. Similarly, if a trough of one wave meets a trough of a second wave, a point of large negative displacement results. Antinodes are always vibrating back and forth between these points of large positive and large negative displacement; this is because during a complete cycle of vibration, a crest will meet a crest; and then one-half cycle later, a trough will meet a trough. Because antinodes are vibrating back and forth between a large positive and large negative displacement, a diagram of a standing wave is sometimes depicted by drawing the shape of the medium at an instant in time and at an instant one-half vibrational cycle later. This is done in the diagram below.

node-antinodes


Nodes and antinodes should not be confused with crests and troughs. When the motion of a traveling wave is discussed, it is customary to refer to a point of large maximum displacement as a crest and a point of large negative displacement as a trough. These represent points of the disturbance that travel from one location to another through the medium. An antinode on the other hand is a point on the medium that is staying in the same location. Furthermore, an antinode vibrates back and forth between a large upward and a large downward displacement. And finally, nodes and antinodes are not actually part of a wave. Recall that a standing wave is not actually a wave but rather a pattern that results from the interference of two or more waves. Since a standing wave is not technically a wave, an antinode is not technically a point on a wave. The nodes and antinodes are merely unique points on the medium that make up the wave pattern.
Sine Cosine
 Devolution or Evolution!? 
ApeDrummer
Not sure I believe that Man would devolve into a drum kit with an ape playing it. Perhaps the image and the walking hominoids above were just reversed in PhotoShop--to the extent that the ascent of Man started from an ape playing drums?
--
Barry Rudolph


 Project Studio Design Class 
Current 2016 PSD Whiteboard Sketches (.zip file)

Harman Room Calculator (.xls file)

Bobby Owinski's PolyMedia YouTube Channel

Auralex Room Analysis Review

Mix Magazine Review KRK's ERGO

3-D Room Eigenmodes Calculator

VocalBooth's Guitar Amp Enclosure

VocalBooth's Vocal Booth

Auralex Room Analysis Kit

Auralex Audio Tile

Auralex Great Gramma

Auralex Microphone Shield

Auralex Spaced Array

Auralex Sono Suede

Auralex SonoLite Bass Trap/Absorber

Auralex Studio Foam

Real Traps' Portable Vocal Booth

CAD Acousti-Shield For Vocal Recording

GIK Acoustics And DIY

Active or Powered Monitor Speakers


All About Fast Fourier Transforms In Audio
Learn The Mid/Side Stereo Technique
Click On The Image Below
Mid-Side Lobes


Of all the instruments ever invented, drums, their sound, and their role in contemporary music continues to undergo change and constant experimentation to this day! The drum kit's sound (itself) is a now a "signature" of different musical genres, producers, engineers and even popular drummers themselves!

That change might have all started with the Benny Goodman and his big hit "Sing, Sing, Sing" written in 1935 by Louis Prima.

The sound engineer took an unheard amount of time (30-minutes) to make sure Gene Krupa's drums sounded perfect for this big 1937 hit with its classic drum-heavy arrangement.



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