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DXZ775USB: First Impressions
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<blockquote data-quote="Babs" data-source="post: 3119229" data-attributes="member: 567066"><p>Ok.. On the time alignment... Check out if you can find the cda-9887r user manual.. since that (non-US) model is out, the manual can be downloaded.. reason I point you to it is that it has a pretty nice educational description of what TA does and the goal for it... Essentially, cliff notes, you want the signal from all your speakers hitting your ears (single location) at the exact same time.. With the distance differences between your left/rights fronts/rears, you typically have quite a big difference in a car. If you draw an overhead picture of your car with speaker locations, you essentially delay those speakers that are closest to your ears to simulate effectively all the speakers being equidistant so that if you drew a circle with your noggin (hehe) in the middle, the speaker distance + any delay added to each would have all speakers forming a perfect circle.. hehehehe.. yeah you really need to read that 9887 section on TA to see what I'm talking about..</p><p></p><p>Trust me... Once you figure it out.. if you get it tuned up nice, you'll be a TA convert.</p><p></p><p>Ok... On the crossovers.. Yes it's typically becoming the norm that these head units will allow either front/rear "sets" or a front-stage of components... Reason.. Rear fill is considered less than hi-fidelity and a distraction and degradation to both frequency response and soundstage.... With a fine set of front components, good TA tuning, good xover tuning and eq, you will not miss rear fill speakers.. at all.. IF its tuned correctly... Goal being to project an audio-image in your car like you're sitting infront of the show at a concert.</p><p></p><p>Exactly... Don't mess with the EQ at ALL until you get your xovers and TA setup... Try to eliminate freq. issues working with a completely flat signal from the head unit.. In general (if not using some sort of freq-plot tool or software) I'd first get my crossovers somewhat dialed in to protect your speakers.. by ear if you have to, FLAT response being the goal.. then TA to get those left and rights hitting your ears at the same time. Then you may need to tweak the xovers if there are any new dips or peaks perceived in those x-over frequencies. Test tone discs help a lot.. You can play a sine right in that x-over freq range and see if there are cancellations between the speakers due to phasing issues (to be fixed with the TA) Then adjust EQ to get to as flat as possible.</p><p></p><p>Disclaimer:</p><p></p><p>Sorry... I'm NO pro and I'll NEVER claim to be.. I may be totally off my rocker and if there are some pro's that cringe reading my recommendations, I humbly will listen and learn from those that actually DO know what the H@#$ they're talking about.</p><p></p><p>Also.. PROTECT your tweeters.. DO NOT send a full range signal to them.</p><p></p><p>Good luck and I hope to hear how this one turns out.</p><p></p><p>//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="Babs, post: 3119229, member: 567066"] Ok.. On the time alignment... Check out if you can find the cda-9887r user manual.. since that (non-US) model is out, the manual can be downloaded.. reason I point you to it is that it has a pretty nice educational description of what TA does and the goal for it... Essentially, cliff notes, you want the signal from all your speakers hitting your ears (single location) at the exact same time.. With the distance differences between your left/rights fronts/rears, you typically have quite a big difference in a car. If you draw an overhead picture of your car with speaker locations, you essentially delay those speakers that are closest to your ears to simulate effectively all the speakers being equidistant so that if you drew a circle with your noggin (hehe) in the middle, the speaker distance + any delay added to each would have all speakers forming a perfect circle.. hehehehe.. yeah you really need to read that 9887 section on TA to see what I'm talking about.. Trust me... Once you figure it out.. if you get it tuned up nice, you'll be a TA convert. Ok... On the crossovers.. Yes it's typically becoming the norm that these head units will allow either front/rear "sets" or a front-stage of components... Reason.. Rear fill is considered less than hi-fidelity and a distraction and degradation to both frequency response and soundstage.... With a fine set of front components, good TA tuning, good xover tuning and eq, you will not miss rear fill speakers.. at all.. IF its tuned correctly... Goal being to project an audio-image in your car like you're sitting infront of the show at a concert. Exactly... Don't mess with the EQ at ALL until you get your xovers and TA setup... Try to eliminate freq. issues working with a completely flat signal from the head unit.. In general (if not using some sort of freq-plot tool or software) I'd first get my crossovers somewhat dialed in to protect your speakers.. by ear if you have to, FLAT response being the goal.. then TA to get those left and rights hitting your ears at the same time. Then you may need to tweak the xovers if there are any new dips or peaks perceived in those x-over frequencies. Test tone discs help a lot.. You can play a sine right in that x-over freq range and see if there are cancellations between the speakers due to phasing issues (to be fixed with the TA) Then adjust EQ to get to as flat as possible. Disclaimer: Sorry... I'm NO pro and I'll NEVER claim to be.. I may be totally off my rocker and if there are some pro's that cringe reading my recommendations, I humbly will listen and learn from those that actually DO know what the H@#$ they're talking about. Also.. PROTECT your tweeters.. DO NOT send a full range signal to them. Good luck and I hope to hear how this one turns out. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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