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70V audio speaker systems70 volt systems are generally used in commercial applications where many speakers needs to be run from one amplifier. It is also called high impedence speaker system. The advantage is that, being high impedence, long cable runs of relatively small gauge (usually 20-24 gauge) do not significantly affect the output as they would in a common low impedence speaker system. This document gives you the basic information about 70V audio speaker systemsUnderstanding amplifier power ratingsThere are different methods for measuring the power ratings for amplifiers and speakers. And different measuring methids give different values so it is vital to understand the difference between theosedifferent power ratings to be able to make at least some comaparisionf between different power ratings. This article is collection of information posted to rec.audio.tech newsgroup at July 1996. The information is compiled from Usenet newsgroup rec.audio.pro articles written by Norbert Hahn, Dick Pierce and Earl K.Audio attenuation dataShort table about audio attenuationAudio cable run lengthInformation about audio cable lenghtTips on repairing and testing audio cablesTips on repairing and testing audio cablesA-weighting filterSimple A-weight filterBalanced connectionsWhat is balanced connection?Dynamic RangeWhat is dynamic range.Elecret microphone connectionElecret microphone connection.Sound system equalizing adviceTips for equalizing audio system.Headphone detailsDetails about headphones and headphone amplifiers.Audio induction loops for hearing aidsAudio induction loop for hearing aids.LoudnessInformation about loud sounds.Simple line mixerThis simple line mixer allows mixing of two line level audio signals together to make on audio signal. This circuit can be used to mix the audo signal from for example two soundcards, CD player, casette deck or any combination of those. This simple circuit is very easy to buils and you can even fit the components inside the RCA connectors if you are careful in construction.Multimedia microphonesInformation about multimedia microphones.Different Noise TypesDescription of different noise types. (Pink, White etc.)Signal Noise RatioInformation about Signal Noise RatioSPDIFInformation about SPDIFSpeaker impedanceThe following article is based on news articles posted to rec.audio.tech newsgroup by Richard Pierce, Dan Marshall and John Woodgate at 1998 and 1999- The article is compiled and edited by Tomi Engdahl at 1999.Measuring speaker element parametersHow to measure speaker element parameters.Surround Sound SystemWho invented surround sound system.VU vs. dBHow does VU and dB meters differ ? |