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Old 03-17-2008   #1
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Default A simple way to tune courtesy of cmusic.......

This is an excerpt from a tuning thread I started on ECA a while back posted courtesy of Chuck Music aka "cmusic" here on the forum Some of you have probably seen this before as I have seen the link posted (and posted it myself) in many threads so I figured I'd just post the whole thing here for all to see and try.

Chuck wanted me to remind everyone that he wrote these tips for someone using a 3-way system with an active crossover between the sub and mids and a passive crossover on the mids and tweeters however the tips can be applied to a completely active 2, 3, or 4-way system. The great thing with these tips is ANYONE can do them without any "special" gear other than a test disc, music you like and most importantly your ears .

I have used these tips (along with a few other tips I've learned from the "gurus" ) with great success over the years. If you follow the sequence just as it is laid out you may be pleasantly surprised at how great it will sound after you just get the acoustic polarity, levels, crossovers and phase between driver pairs set.

Also wanted to mention that Chuck hangs around here sometimes so if you have any questions I'm sure he wouldn't mind answering. Thanks Chuck and here we go!

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There are several different methods used to tune eqs. This is the one I use. An RTA is not needed if the steps are done correctly. This method uses crossovers and gain settings as the most important factor in tuning. I think the eq should be last in line when tuning. Remember after each step to write down your settings. If the sound gets worse, then you can go back to the previous stepís settings and start over.


1. Set all bands flat, as well as the head unit bass and treble.

2. Turn off the subs. Using music with a good bass line, run the highpass crossover up and down until the midbasses can play as low as possible without any distortion or excessive door panel vibrations.

3. Unhook the mids and tweeters, allowing only the midbasses to play. Listen to mono pink noise or a well-recorded song with a centered vocalist. Test CDs such as the IASCA test CD or Autosound 2000 Test CD 102 or 103 will work great. Listen to where the centered sounds are coming from. Then reverse the polarity of one midbass (Reverse the Speaker wires coming from the passive crossover and going to the speaker, just flip the positive and negative wires. I usually flip the driverís side speaker.) and re-listen to the test CD. If the sounds are more centered then keep it as is. If the centered sounds are more diffuse and un-locatable, then flip the polarity back to where it was originally.

4. Then unhook the midbasses and play the mids only and follow the same polarity and listening tests as before. Mark your best settings.

5. Do the same procedure for the tweeters.

6. When you have tested for the proper polarity from all three ranges of speakers, hook all of them back up with respect to each set of speakerís best polarity. You can have any combination of polarity, such as all the midbass and tweeters straight and one midrange reversed.

7. Now you should have the correct ďacousticĒ polarity set within each set of speakers. Next is to set the acoustic polarity between the sets of speakers.

8. Listen to some very familiar music with a good range of sounds. Then flip both midbassí polarity and listen again. Before you only flipped one midbass, now you are doing both at the same time. For example if the left midbass was reversed and the right was not before, now the left will be not reversed and the right will be. Listen to the music again. If the midbass is more powerful and full then leave the wiring as is. If the midbass sounds weaker and wrong then restore the wiring as before.

9. Perform the same listening tests while flipping the mids and tweeters, and use the wiring configuration that sounds the best.

10. If you have went though all these steps adjusting the polarity of the speakers then the system should sound really good without any eq adjustments. You might want to play with the gain adjustments on the crossover and/or amp to better blend all the speakers together.

11. Now onto the eq! The first eq step is to adjust the tonality. While listening to familiar music, adjust each individual band up and down slowly. When the music sounds better then move to the next band. Adjust the left and right bands equally. (Weíll get to the separate left and right adjustments soon.) It really does not matter if the bands are boosted or cut, just that it makes the sound better. Not every band needs to be adjusted. In fact if you did steps 1 thru 10 correctly you should not have to adjust over half the bands. Having a 1/3 octave eq does not mean you have to adjust every band. It means you have the ability to adjust each band if needed. Watch out for big jumps from band to band, like one band set to +4 and the next band set to Ė6.

12. Continue through all the bands, take a break, and do the same procedure over again. But this time the adjustments will be smaller as you get the tonality dialed in. This step might take several days, weeks, or longer.

13. In tuning you will find some eq bands will raise, lower, move the sound closer, or farther away if adjusted in certain manners. For example, lowering 5 KHz will generally move the soundstage farther away and raising 2 KHz will make the soundstage rise. Each vehicle and system will have different settings that will be the best. The best way to achieve awesome sound is to constantly adjust.

14. When you are satisfied with the tonality of the system, it is time to start adjusting the left and right channels separately. These adjustments should not affect the tonality, but improve on the imaging and soundstaging. Using the Autosound 2000 Test CD 102 or 103 ďMy DiskĒ listen to the individual frequency pink noise tracks. (Test CD103 has the tracks arranged in an easier configuration.) Each frequency band should sound like it is coming from the center of the soundstage. If one band is off to one side, then use each bandís left and right eq controls as a balance control. This is very similar to the head unitís balance control, only now you are balancing each frequency band by itself. For example if 200 Hz seems to be shifted to the left of center, lower the left 200 Hz band and raise the right 200 Hz band one dB at a time until the band is centered. If a frequency is shifted to the right, lower the bandís right channel and raise the left channel in small amounts.

15. When you have when through all the bands take a break. Then later go back through each band one by one and make any further needed adjustments until all the frequencies are lined up in the center of the soundstage.

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Old 03-17-2008   #2
 
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Default Re: A simple way to tune courtesy of cmusic.......

Marv,

Thanks for posting this up. I'm gonna save it this time to my computer. I think this is truly the best starting point. As you have told me before, if you go through these steps, generally very minimal prosessing needs to be carried out. I think this really gets at the fundamentals, and when I have time, you can bet I will be going through every single step.

Hope things are well with you. I've been crazy busy going through the process of applying for residencys etc.....I'll give you a shout when I have some down time. take care...
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Old 03-17-2008   #3
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Default Re: A simple way to tune courtesy of cmusic.......

I did this myself using this post and Fox's "windshield ate my soundstage" thread. He provided a link to some sine waves that match Alpine's G-EQ bands. I then took each wave and the above info and started tuning. It worked out pretty well for me.

For those who are interested, I compressed about 30 sine waves into one file so that you can use your Alpine G-EQ to tune with if you have one. here's the link to the .rar'd file:
http://rapidshare.com/files/94343821...Tones.rar.html

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Old 03-17-2008   #4
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Default Re: A simple way to tune courtesy of cmusic.......

thanks
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Old 03-20-2008   #5
 
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Default Re: A simple way to tune courtesy of cmusic.......

Just a quick Q? Does this apply to a Car that is great for one seat or two? Assuming its a normal car/seating configuration. (ie two people sit at the front abreast)
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Old 03-20-2008   #6
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Default Re: A simple way to tune courtesy of cmusic.......

Quote:
Originally Posted by syd-monster View Post
Just a quick Q? Does this apply to a Car that is great for one seat or two? Assuming its a normal car/seating configuration. (ie two people sit at the front abreast)
That's a good question! I have never been fortunate enough to have suitable PL's/PLD's in order to try a 2 seater so maybe Chuck or one of the others who have experience with this can chime in.

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Old 03-21-2008   #7
 
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Default Re: A simple way to tune courtesy of cmusic.......

Very cool ideas, I look forward to trying them out.
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Old 05-04-2008   #8
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Default Re: A simple way to tune courtesy of cmusic.......

This is a great thread!!!
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Old 05-06-2008   #9
 
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Default Re: A simple way to tune courtesy of cmusic.......

Great info here! Maybe sticky worthy?

"Perfection is not attainable, but if we chase perfection we can catch excellence. -Vince Lombardi
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Old 08-07-2008   #10
 
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Default Re: A simple way to tune courtesy of cmusic.......

Absolutely should be a sticky. Great info for a noob (such as myself).
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Old 12-09-2008   #11
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Default Re: A simple way to tune courtesy of cmusic.......

Tune-up time !
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Old 12-10-2008   #12
 
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Default Re: A simple way to tune courtesy of cmusic.......

nice...........


im wondering if there is a tutorial for a passive 2-way system ? or how i would go about this with a 2-way (morel tempo 6's) passive system im kind of a newb when it comes to tuning : (
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Old 12-10-2008   #13
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Default Re: A simple way to tune courtesy of cmusic.......

The tutorial would be no different for a 2-way. There's just one less set of speakers to worry about, and you can skip a step. If you're a newb and don't understand the tutorial, reread it until you do. Don't get discouraged; just think about it until you understand. It's really not that complicated, for a 2-way especially.

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Old 12-13-2008   #14
 
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Default Re: A simple way to tune courtesy of cmusic.......

If your deck has time delay, how would you tune it. Would you zero all of your delay settings on your deck and then use this method, using the delay to make final critiques or would you just set all of your drivers in phase and use the delay function on your deck by itself
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Old 12-14-2008   #15
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Default Re: A simple way to tune courtesy of cmusic.......

Great Info. Thank you.
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Old 12-16-2008   #16
 
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Default Re: A simple way to tune courtesy of cmusic.......

I just printed this off and burned the tones listed and I am amazed at how much better it sounds already......wish I had a better eq on the deck.But after about an hour of working with it I now understand better how the sounds on the ex work together a little better....thanks
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Old 02-01-2010   #17
 
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Default Re: A simple way to tune courtesy of cmusic.......

Im using DRZ9255 which all has polarity on it x-over module...that can be switch into normal or reverse....do I still need to the the polarity on the amp +ve and -ve? Will doing the phase on the HU can be consider the same as doing it on the amp?
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Old 02-01-2010   #18
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Default Re: A simple way to tune courtesy of cmusic.......

Great info

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Old 02-01-2010   #19
 
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Default Re: A simple way to tune courtesy of cmusic.......

maybe a sticky?

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Old 02-02-2010   #20
 
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Default Re: A simple way to tune courtesy of cmusic.......

The rapidshare link to Bikinpunk's digitized sine waves is broken. Would any one still have this file available? It sounds useful - a lot simpler than dragging out my various generators, RTA's and an oscilloscope when I'm not worried about crazy precision.
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Old 06-11-2010   #21
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Thumbs up Re: A simple way to tune courtesy of cmusic.......

Great information for tweaking and fine tuning in Car Audio. Thank you very much.

Best Regards

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Old 06-13-2010   #22
 
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Default Re: A simple way to tune courtesy of cmusic.......

What about time alignment and phase changes at different frequencies?
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Old 07-20-2010   #23
 
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Default Re: A simple way to tune courtesy of cmusic.......

Great writeup. Thanks.
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Default Re: A simple way to tune courtesy of cmusic.......

Thanks for the great post! I'll be doing that soon.

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Old 09-14-2010   #25
 
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Default Re: A simple way to tune courtesy of cmusic.......

Nice write up...
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