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Power vs Decibels
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<blockquote data-quote="ThxOne" data-source="post: 8720627" data-attributes="member: 675210"><p>That IS pretty much the goal... how loud literally or to that "reference point with a given wattage" will the speakers get without breaking up. I know the numbers will be different than just the straight forward math given above. Like distance, direct and reflected sound, the number of drivers, mounting locations and so on all affect the output of the drivers. My main question was how loud should each speaker be in relation to the next type of driver.</p><p></p><p>If I tune my mids and the max undistorted output they give me is 100db do I then bring my tweeters up to 100db to blend with them or are they supposed to be at more or less output than the mids?</p><p></p><p>SkizerR suggested this - "Try a curve that is flat from 20hz to 40hz, then from 40hz, drops 18db to 200hz.<strong><u> Flat from 200hz to 2.5khz, then from 2.5khz to 20khz, maybe a 5 db drop</u></strong>. afterwards, you might need to cut a bit in the 2.5-4k area" So, ignoring the sub at this point, the goal is a flat run of mids up to the tweeter and the tweeters should have less output in the range of up to -5db? </p><p></p><p>If an IASCA judge is sitting in my car I want them to say "It may not be the best sounding stereo but output is correct". I have no reference personally so I need a reference. Everyone says my DSP is capable of so much more and I want to get more out of it. Yes, knowing approximately how loud speakers could get with specific wattage input will help tremendously. </p><p></p><p>What I am going to do is set my mids with a -5db reference tone and stop. I will then break out the MIC and I will use uncorrelated PINK noise and measure the mids then flatten the output with the EQ in the DSP then stop. I will then, using the same pink noise, bring up the tweeters to up to -5db of the flattened mids curve? Then EQ the Tweets? Blending the sub in is easier to do by ear, then eq as well.</p></blockquote><p></p>
[QUOTE="ThxOne, post: 8720627, member: 675210"] That IS pretty much the goal... how loud literally or to that "reference point with a given wattage" will the speakers get without breaking up. I know the numbers will be different than just the straight forward math given above. Like distance, direct and reflected sound, the number of drivers, mounting locations and so on all affect the output of the drivers. My main question was how loud should each speaker be in relation to the next type of driver. If I tune my mids and the max undistorted output they give me is 100db do I then bring my tweeters up to 100db to blend with them or are they supposed to be at more or less output than the mids? SkizerR suggested this - "Try a curve that is flat from 20hz to 40hz, then from 40hz, drops 18db to 200hz.[B][U] Flat from 200hz to 2.5khz, then from 2.5khz to 20khz, maybe a 5 db drop[/U][/B]. afterwards, you might need to cut a bit in the 2.5-4k area" So, ignoring the sub at this point, the goal is a flat run of mids up to the tweeter and the tweeters should have less output in the range of up to -5db? If an IASCA judge is sitting in my car I want them to say "It may not be the best sounding stereo but output is correct". I have no reference personally so I need a reference. Everyone says my DSP is capable of so much more and I want to get more out of it. Yes, knowing approximately how loud speakers could get with specific wattage input will help tremendously. What I am going to do is set my mids with a -5db reference tone and stop. I will then break out the MIC and I will use uncorrelated PINK noise and measure the mids then flatten the output with the EQ in the DSP then stop. I will then, using the same pink noise, bring up the tweeters to up to -5db of the flattened mids curve? Then EQ the Tweets? Blending the sub in is easier to do by ear, then eq as well. [/QUOTE]
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