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Car Audio Equipment
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High Pre-Amp Voltage H/U
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<blockquote data-quote="AlterEgo99" data-source="post: 6020095" data-attributes="member: 610253"><p>You must be new here...get used to it...it's how we operate...but you will get the answers you seek, so, get off your //content.invisioncic.com/y282845/emoticons/highhorse.gif.6bbb570c3f53dc0dcce8a2b8ad05cf11.gif and grow a thick skin, quickly! //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif</p><p></p><p>Taken from <a href="http://www.bcae1.com/:" target="_blank">http://www.bcae1.com/:</a></p><p></p><p>Amplifier Gain Controls:</p><p></p><p>Contrary to popular belief, an amplifiers' gain control does not determine the maximum power that an amplifier can produce. As long as the preamp/drive signal has sufficient level, the amplifier will produce its maximum power output level. The gain controls are used to match the amplifer's gain to the gain of the other amplifiers in the system (in the case of a multi-amp system). The gain controls also allow you to match the amplifier(s) to the head unit. Not all head units have the same maximum preamp output voltage. Some head units are capable of producing 9 vrms out while others are only capable of 1.5 vrms out.</p><p></p><p>Please note that a head unit will reach its maximum output level (clipping) well before the volume control reaches the upper end of its range (usually at a point of 85-90% of its maximum range).</p><p></p><p>Note (rant):</p><p></p><p>There have been many people who have said that the gain controls were not volume controls and they are right, to a point. Some amplifiers' gain controls are used precisely like a volume control (one end of the potentiometer connected to ground, the other end connected to the pre-amp signal and the wiper connected to the amplifier's front end). This configuration will allow you to reduce the output to nothing at the minimum gain position. These are not very common but they HAVE been used on some amplifiers. I know because I took the cover off of a few amps to see why they had absolutely no output (Doh!). Others are connected similarly but there is a small amount of resistance between ground and the formerly grounded terminal of the potentiometer. This small resistance prevents the gain control from reducing the output to zero output. These are very common on amplifiers made in Korea and China. There are other amps that use the potentiometer to pull the signal toward ground. The pot is the lower half of a voltage divider and may use only 2 legs of the potentiometer. This type of gain control was used on at least one brand of Japanese manufactured amplifier. You can also put the potentiometer in the feedback loop to control the overall gain of the amplifier. The point to all of this is... There are many ways to use a potentiometer to control the output of the amplifier. Some are used precisely as volume controls and others are not. You cannot make a blanket statement such as 'gain controls are not volume controls'.</p></blockquote><p></p>
[QUOTE="AlterEgo99, post: 6020095, member: 610253"] You must be new here...get used to it...it's how we operate...but you will get the answers you seek, so, get off your [IMG]//content.invisioncic.com/y282845/emoticons/highhorse.gif.6bbb570c3f53dc0dcce8a2b8ad05cf11.gif[/IMG] and grow a thick skin, quickly! [IMG]//content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif[/IMG] Taken from [URL="http://www.bcae1.com/:"]http://www.bcae1.com/:[/URL] Amplifier Gain Controls: Contrary to popular belief, an amplifiers' gain control does not determine the maximum power that an amplifier can produce. As long as the preamp/drive signal has sufficient level, the amplifier will produce its maximum power output level. The gain controls are used to match the amplifer's gain to the gain of the other amplifiers in the system (in the case of a multi-amp system). The gain controls also allow you to match the amplifier(s) to the head unit. Not all head units have the same maximum preamp output voltage. Some head units are capable of producing 9 vrms out while others are only capable of 1.5 vrms out. Please note that a head unit will reach its maximum output level (clipping) well before the volume control reaches the upper end of its range (usually at a point of 85-90% of its maximum range). Note (rant): There have been many people who have said that the gain controls were not volume controls and they are right, to a point. Some amplifiers' gain controls are used precisely like a volume control (one end of the potentiometer connected to ground, the other end connected to the pre-amp signal and the wiper connected to the amplifier's front end). This configuration will allow you to reduce the output to nothing at the minimum gain position. These are not very common but they HAVE been used on some amplifiers. I know because I took the cover off of a few amps to see why they had absolutely no output (Doh!). Others are connected similarly but there is a small amount of resistance between ground and the formerly grounded terminal of the potentiometer. This small resistance prevents the gain control from reducing the output to zero output. These are very common on amplifiers made in Korea and China. There are other amps that use the potentiometer to pull the signal toward ground. The pot is the lower half of a voltage divider and may use only 2 legs of the potentiometer. This type of gain control was used on at least one brand of Japanese manufactured amplifier. You can also put the potentiometer in the feedback loop to control the overall gain of the amplifier. The point to all of this is... There are many ways to use a potentiometer to control the output of the amplifier. Some are used precisely as volume controls and others are not. You cannot make a blanket statement such as 'gain controls are not volume controls'. [/QUOTE]
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