Time correction help on CDA-9887

[Cyrax89721]

I'm having a hell of a time trying to figure this out. Seems I would need to be mathematically inclined to do so, which I'm not, so I'm hoping somebody here has figured this thing out!

Here's my stats:

Left Front: 32.2 inches from my left ear

Right Front: 46.9 inches from my right ear

Left Rear: 48.2 inches from my left ear

Right Rear: 54.9 inches from my right ear

Can anybody help me in figuring out what values I need to put in for each correlating channel? So far, all I know is that the right rear needs to be at zero.

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[99StangGt 10+ year member]

32.2 would be either 61. or 1.0

46.9 would be either 64 or 1.9

48.2 would be either 65 or 1.4

54.9 would be either 67 or 1.6

Thats off the 9835 manual, should be the same as the 9887

I dont use the numbers but just adjust to where I like it.

 

[cocoleveo7686 10+ year member]

32.2 would be either 61. or 1.046.9 would be either 64 or 1.9

48.2 would be either 65 or 1.4

54.9 would be either 67 or 1.6

Thats off the 9835 manual, should be the same as the 9887

I dont use the numbers but just adjust to where I like it.

how did you figure all that out? is it how far away you are from each speaker?

 

[99StangGt 10+ year member]

I went by what what the manual said. Its about how far you are from each speaker according to the outputs of the deck.

 

[mikey7182 10+ year member]

Not to jump way off topic or steal the thread, but it just occured to me- I'm installing my 9887 this weekend and am running a set of Boston Pros active, with no rear fill. How would I use the TA for that, since the mids will be off the front channels and the tweeters off the rear channels? Do I still measure the distance from the tweeter and the mid, or do I just not use the TA?

 

[ramos 5,000+ posts]

You guys are going about it all wrong . Don't TA each individual speaker , take the difference between the two and add that difference to the closest driver . so using your measurements

We need to convert the measurements to metric to make the math easier . Your difference in mids is 14.7 inches . that gives us .37338 meters so we divide .37338 by 343 ( speed of sound in m/s ) and multiply this by 1000. This gives us 1.09 miliseconds.

So that means you need to add 1.09 miliseconds of delay on the Left front. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[ramos 5,000+ posts]

Not to jump way off topic or steal the thread, but it just occured to me- I'm installing my 9887 this weekend and am running a set of Boston Pros active, with no rear fill. How would I use the TA for that, since the mids will be off the front channels and the tweeters off the rear channels? Do I still measure the distance from the tweeter and the mid, or do I just not use the TA?

Same way I just showed him . I haven't played with the 9887 yet , but look on the outside chassis of the receiver and see if it has a f/r subw - 3 way dip switch on it. If it does , switch it to 3 way and use the same formula in the post above for both the mids and the tweets //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Flipx99 5,000+ posts]

You guys are going about it all wrong . Don't TA each individual speaker , take the difference between the two and add that difference to the closest driver . so using your measurementsWe need to convert the measurements to metric to make the math easier . Your difference in mids is 14.7 inches . that gives us .37338 meters so we divide .37338 by 343 ( speed of sound in m/s ) and multiply this by 1000. This gives us 1.09 miliseconds.

So that means you need to add 1.09 miliseconds of delay on the Left front. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Good to know. I have an 880 but I just emailed this to myself.

 

[ramos 5,000+ posts]

Good to know. I have an 880 but I just emailed this to myself.

Did pioneer change the way there TA is adjusted ? I thought it was set in inches on their units so you didn't have to do the conversions //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[99StangGt 10+ year member]

ramos is right about how to figure it out. I was only showing what manual said for those measurements in the chart. The 9887 uses different numbers. here is a link to the manual if you dont have one.

http://vault.alpine-usa.com/products/documents/OM_CDA-9887.PDF

 

[Cyrax89721]

You guys are going about it all wrong . Don't TA each individual speaker , take the difference between the two and add that difference to the closest driver . so using your measurementsWe need to convert the measurements to metric to make the math easier . Your difference in mids is 14.7 inches . that gives us .37338 meters so we divide .37338 by 343 ( speed of sound in m/s ) and multiply this by 1000. This gives us 1.09 miliseconds.

So that means you need to add 1.09 miliseconds of delay on the Left front

The only problem here is that my head unit asks me how many inches to delay each channel. What would this convert to in inches? 14.7 inches of delay to my front left? What about the rest of the channels? Sorry I'm so clueless...//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[oneiztoomany 10+ year member]

cant you just set it by ear?

 

[mikey7182 10+ year member]

Same way I just showed him . I haven't played with the 9887 yet , but look on the outside chassis of the receiver and see if it has a f/r subw - 3 way dip switch on it. If it does , switch it to 3 way and use the same formula in the post above for both the mids and the tweets //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

So if I'm running the components actively, I measure the distance of the left tweeter to my ear, right tweeter to my ear, take the difference, convert it to meters then ms and add that one to whichever is closer? And same thing with the mids? Thanks for the help!

Mike

 

[aeon 10+ year member]

I think you put in 1.09 milliseconds to the speaker closest to you and 0 to the speaker farthest from you.

 

[ramos 5,000+ posts]

The only problem here is that my head unit asks me how many inches to delay each channel. What would this convert to in inches? 14.7 inches of delay to my front left? What about the rest of the channels? Sorry I'm so clueless...//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

Well son of a gun , alpine went inches instead of miliseconds //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

yes you would just add the difference to the closest speaker ( left ) . 0 to the right . You can leave the rears at zero. Might need to play around around those delay lengths plus or minus and inch. see what centers everything up //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif