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Help with proper amp gain Setting
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<blockquote data-quote="Databyter" data-source="post: 6797363" data-attributes="member: 621750"><p>Your confusing yourself with the reference to matching the voltage from your HU.</p><p></p><p>Yes, the gain adjustment is used to make sure the signal from the Head Unit Preout (regardless of the voltage) is pushed up to match what the amplifier primary circuit wants to see.</p><p></p><p>So, You're not trying to <strong>"match"</strong> 2 volts, your trying to <strong>"compensate"</strong> for it.</p><p></p><p>Just another example of someone who really knows what they are talking about using the wrong language in a manual or a tutorial and thereby confusing someone who doesn't know <strong>what he means</strong> and can only go by what he <strong>actually is saying</strong></p><p></p><p>Your not trying to match 2 volts. Your trying to set the gain whether it is 2 or 4 volts or whatever so that it looks exactly the same as what the primary circuit on the amp. wants to see as it's starting point (voltage).</p><p></p><p>Also despite what some have said you want to have the gain as low as possible, if it's too high you will have more volume, but you will also reach a point of distortion, clipping and overdriving that pretty much defeats the purpose of having an amp in the first place. If your amp can't do what you want at the right gain setting, then you need to buy a bigger/better amp, period.</p><p></p><p>The advantage of higher voltage pre-outs is that the gain at the amp can be set lower, so any extraneous noise that it picked up from the head unit, or from the car which is also amplified, will be amplified less.</p><p></p><p>In other words, the signal to noise ratio will always be higher when the signal level is higher while the noise remains the same.</p><p></p><p>A 4 volt preout will have twice the headroom over the noise level as a 2 volt system. But in practice, every car and every HU has a different level of electrical noise, so you can get fine results from 2 Volts out if you use good cables and your HU is decent. With 4 Volts it's just that much better and that much easier to keep the noise threshold below audible.</p><p></p><p>By the way I have that head unit also, I'm thinking of upgrading though, I want to have 6 channel pre-outs at 4 volts and a built in HD radio. But so far it's served me well, it's just that I have 4 speakers and a sub, and with only 2 sets of preouts I will lose my ability to use the fade on the headunit for the 4 speakers.</p></blockquote><p></p>
[QUOTE="Databyter, post: 6797363, member: 621750"] Your confusing yourself with the reference to matching the voltage from your HU. Yes, the gain adjustment is used to make sure the signal from the Head Unit Preout (regardless of the voltage) is pushed up to match what the amplifier primary circuit wants to see. So, You're not trying to [B]"match"[/B] 2 volts, your trying to [B]"compensate"[/B] for it. Just another example of someone who really knows what they are talking about using the wrong language in a manual or a tutorial and thereby confusing someone who doesn't know [B]what he means[/B] and can only go by what he [B]actually is saying[/B] Your not trying to match 2 volts. Your trying to set the gain whether it is 2 or 4 volts or whatever so that it looks exactly the same as what the primary circuit on the amp. wants to see as it's starting point (voltage). Also despite what some have said you want to have the gain as low as possible, if it's too high you will have more volume, but you will also reach a point of distortion, clipping and overdriving that pretty much defeats the purpose of having an amp in the first place. If your amp can't do what you want at the right gain setting, then you need to buy a bigger/better amp, period. The advantage of higher voltage pre-outs is that the gain at the amp can be set lower, so any extraneous noise that it picked up from the head unit, or from the car which is also amplified, will be amplified less. In other words, the signal to noise ratio will always be higher when the signal level is higher while the noise remains the same. A 4 volt preout will have twice the headroom over the noise level as a 2 volt system. But in practice, every car and every HU has a different level of electrical noise, so you can get fine results from 2 Volts out if you use good cables and your HU is decent. With 4 Volts it's just that much better and that much easier to keep the noise threshold below audible. By the way I have that head unit also, I'm thinking of upgrading though, I want to have 6 channel pre-outs at 4 volts and a built in HD radio. But so far it's served me well, it's just that I have 4 speakers and a sub, and with only 2 sets of preouts I will lose my ability to use the fade on the headunit for the 4 speakers. [/QUOTE]
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