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Alpine CDA-9887 - Help for the totally ignorant
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<blockquote data-quote="mikey7182" data-source="post: 3706829" data-attributes="member: 580809"><p>Running active means using the headunit or an amplifier to set the crossover points for your component set rather than using the passive crossovers that come with the component set. Active, in other words, determines the exact frequencies sent to each speaker BEFORE or AT the amp rather than inline between the amp and the speakers. The 9887 has the ability to do this, as do certain other higher end headunits. It also has the ability to be a regular 2 way crossover, which allows you to set a Low Pass Filter on your Subwoofer (cuts off all frequencies above the frequency you pick, more or less) and a High Pass Filter that allows you to cut off all the frequencies below the one you choose, more or less, for your mids. Then if you use the passive crossovers (assuming you're using a component set) they will send the right frequencies to the woofer and the tweeter. There are also slopes you can set the crossover at, which determines how steeply after the chosen frequency the speaker stops responding. But that's an entirely different subject. What's important is what sounds good to you, and making sure the speakers are subjected to safe frequencies. If you set your High Pass Filter too low for your mids, you'll hear distortion at higher volumes because they aren't designed to respond like woofers, etc. Play around with the crossovers and see what sounds good to you. Typically 80-100 HZ is a safe High Pass Filter for most mids and highs. Likewise, 63-80 HZ is usually a good frequency to set your Low Pass Filter for the subs.</p><p></p><p>As far as the EQ, Parametric allows you to adjust the level of different frequencies to bring out different sounds in the music you listen to. There are usually preprogrammed options, like Rock, Rap, Jazz/Blues, etc. Also, you can customize your own to your liking. The difference between a Parametric EQ and a Graphic EQ is a Parametric EQ will boost or reduce a frequency RANGE, whereas a Graphic EQ boosts or reduces a specific frequency. For example, if you want more bass, using a Parametric EQ, you would boost the 50HZ frequency, and this will have an affect on say everything from 30 to 100 HZ, with the greatest increase at 50 HZ. If you do the same on a graphic EQ though, it will only boost the level at 50 HZ and not affect the other frequencies around it.</p><p></p><p>THere's days of information on the subject, and I am far from well-versed, but hopefully that gives you a bit of information as a starting point.</p><p></p><p>Mike</p></blockquote><p></p>
[QUOTE="mikey7182, post: 3706829, member: 580809"] Running active means using the headunit or an amplifier to set the crossover points for your component set rather than using the passive crossovers that come with the component set. Active, in other words, determines the exact frequencies sent to each speaker BEFORE or AT the amp rather than inline between the amp and the speakers. The 9887 has the ability to do this, as do certain other higher end headunits. It also has the ability to be a regular 2 way crossover, which allows you to set a Low Pass Filter on your Subwoofer (cuts off all frequencies above the frequency you pick, more or less) and a High Pass Filter that allows you to cut off all the frequencies below the one you choose, more or less, for your mids. Then if you use the passive crossovers (assuming you're using a component set) they will send the right frequencies to the woofer and the tweeter. There are also slopes you can set the crossover at, which determines how steeply after the chosen frequency the speaker stops responding. But that's an entirely different subject. What's important is what sounds good to you, and making sure the speakers are subjected to safe frequencies. If you set your High Pass Filter too low for your mids, you'll hear distortion at higher volumes because they aren't designed to respond like woofers, etc. Play around with the crossovers and see what sounds good to you. Typically 80-100 HZ is a safe High Pass Filter for most mids and highs. Likewise, 63-80 HZ is usually a good frequency to set your Low Pass Filter for the subs. As far as the EQ, Parametric allows you to adjust the level of different frequencies to bring out different sounds in the music you listen to. There are usually preprogrammed options, like Rock, Rap, Jazz/Blues, etc. Also, you can customize your own to your liking. The difference between a Parametric EQ and a Graphic EQ is a Parametric EQ will boost or reduce a frequency RANGE, whereas a Graphic EQ boosts or reduces a specific frequency. For example, if you want more bass, using a Parametric EQ, you would boost the 50HZ frequency, and this will have an affect on say everything from 30 to 100 HZ, with the greatest increase at 50 HZ. If you do the same on a graphic EQ though, it will only boost the level at 50 HZ and not affect the other frequencies around it. THere's days of information on the subject, and I am far from well-versed, but hopefully that gives you a bit of information as a starting point. Mike [/QUOTE]
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