A2562

Automobile Noise Levels $3.5

Benchmark Article on Ambient Sound

Road noise, engine noise, wind noise, and vibrations are all experienced inside a vehicle. Some vehicles are noisier than others. This article describes a method of recording the spectral content of various cars. Charts are presented and 18 figures are included.

A2570

Damping $3.5

Benchmark Article on Amplifier Damping Specs

Richard Clark discusses the definition and real-life implications of the damping factor specification. This is an Advanced Topic article and includes equations and physics.

A2600

SPL $3.5

Benchmark Article on Bass / SPL  Problems

Why does the bass get louder when the trunk or window is open? Why is microphone placement so critical in SPL measurements? This article answers the questions.

A2555

Bass Principles $2.5 Reduced from $3.5. You save $1.00!!

Benchmark Article on Bass in a Car

Pressure zones and waves are defined. Speakers propagating into ½ space, ¼ space, 1/8 space, etc. are diagramed. The effects of location of the woofer enclosure on the response is discussed and plotted.

A2573

Car Battery Frequently Asked Questions $3.5

Benchmark Article on Batteries

This article answers specific questions on charging, jump starting, buying batteries, cold-cranking amps, reserve capacity, installation, longevity, battery failure, and battery myths. One chart included.

A2596

Aperiodic MemBrain Technology $3.5

Benchmark Article on Enclosures

The first article that answers many questions on the subject of Aperiodic MemBrain sub woofer systems.

A2574

12 Volt Confusion $3.5

Benchmark Article on Getting Killed by 12 Volts

This article is a rebuttal to some Rocket Scientist who claimed that a 12 volt, 1 Farad capacitor could kill a human. The article is 7 pages long and answers the question about the safety of 12-volt components. Don’t miss this article!

A2610

Measuring Magnetic Fields $3.5

Benchmark Article on Mapping Noise

The use of a magnetic probe and DMM to quantify low frequency electro-magnetic noise. This article tells why cars with batteries in the back can be much noisier than regular cars. A must-read for all installers.

A2581

Amplifier Tests With Reactive Loads $3.5

Benchmark Article on Power Testing Amplifiers

The difference between resistive loading and using IHF reactive loads to test amplifiers is covered in this article. Many charts included.

A2552

Amplifier Output Regulation $2.5 Reduced from $3.5. You save $1.00!!

Benchmark Article on Regulated vs. Non-Regulated Amps

Richard Clark explains the definition of regulation in the power supplies of power amplifiers. Some amps are more tightly regulated than others. Learn about how much regulation is enough. There are 17 charts in this article.

A2607

Misconceptions In Cabling $3.5

Benchmark Article on Signal Cables

This nine-page article discusses the various types of signal cables and how they interact with noise fields from the car. The merits of using UTP over STP are demonstrated. Loop area inductive noise is covered in detail. This is a must-read article for every installer.

A2438

Determining Speaker Placement $3.5

Benchmark article on System Design

A method of testing a vehicle for optimal speaker placement BEFORE the speakers are installed.

A2442

An Ideal RTA Response $3.5

Benchmark article on the value of RTAs

Topics of Near Field listening, Direct and Reflected sound, Spectral Balance, RTAs, human perception and frequency response, reflections are presented.

A2580

Audio Transformers $3.5

Benchmark Article on Transformers

This eight page article discusses the most important engineering specifications of audio transformers. Differential amplifiers, common mode rejection ratios and Jensen Transformers are described in detail. Many drawings included.