All posts by Nyal Mellor

Power and Grounding: The Acoustic Frontiers Approach

We recently spent some serious research & development time developing what could be called the Acoustic Frontiers approach to power and grounding for audio, home theater and studios.

Here are some of the juicy topics covered on our power pages:

  • Why should you care about how your system is powered and grounded?
  • What is the anatomy of the power and grounding system feeding your AV gear?
  • Do you know that there are 8 power and grounding issues that can affect the performance and lifespan of your AV system?
  • What are the causes and cures of 60Hz hum and powerline harmonic buzzing?
  • Why are 99% of all (Metal Oxide Varistors) no good for AV equipment?
  • Why do you need a UPS for your projector?
  • What is the concept of whole room power conditioning?

SurgeX Powerframe 420

Home Theater Calibration 101: Speaker Levels, Distances and Subwoofer Phase

Introduction This blog article will teach you about home theater calibration – in particular how to calibrate the audio side of your home theater pre-processor (pre-pro) or audio visual receiver (AVR). I’m not going to cover the video side. The three basic elements of audio calibration in home theater setup are: Speaker and subwoofer levels […]

Four approaches to room acoustic measurement

This article covers the four main ways in which you can measure your room’s acoustics. In decreasing ease of use order these are: Integrated software / hardware packages such as XTZ Room Analyzer and Dayton Audio Omnimic Standalone software packages and your choice of measurement microphone, cabling and soundcard such as Room EQ Wizard Hardware devices such […]

Hard proof that equalization kills room modes

In recent years there has been much debate about how effective equalization is in reducing the negative impact of room modes. Room modes are characterized by a peak in the frequency response and extended ringing in the time domain. They create low frequency coloration and lack of articulation and are perhaps one of the most prevalent acoustical problems, since they exist in all small rooms. This article provides measured evidence of the efficacy of equalization in reducing both the peak and ringing associated with room modes.

Impulse Response measurement showing reduction in ringing from EQ

Two channel amplifiers with bass management and room correction!

Recently I have become aware of a new class of product: two channel amplifiers WITH bass management AND room correction. Why is this cool? Well until this new class of products came out the only way to do this type of thing was with a home theater receiver or a separate preamplifier such as a DEQX or TacT and a power amplifier. Two channel systems benefit just as much from subwoofers and equalization as home theater systems. Many two channel speakers, even high end ones, cannot reproduce low bass below say 30-40Hz with low distortion. A JL Audio F112 can play down to 19Hz at a -3dB point! Using subwoofers also allows for cunning room mode cancellation and avoidance of speaker boundary interference.

Classe CP-800