Tunning PXA H701

rjcastr
10+ year member

CarAudio.com Elite
Is there a guide or a book that will teach me about tuning , what a phase is, curves, flat and all the terms the gurus use about tuning, im trying to learn but i have the slightest clue on how to start and what i should look for.

Help //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 
That's an expensive and complicated piece for someone to be setting up who doesn't even know where to start. We cannot possibly tweak your system for you over the internet. Id suggest sticking around here a while and learning the ropes. That processor has many functions, it would take all day to explain each of them to you. The owner's manual should cover the basics. Then, come back here with any specific questions you have. Another good trick to learning is pay your local shop to tweak your system while you listen in and ask questions. That would be a big help to you.

Just making a general question of what buttons to start hitting on your processor to make improvements is too.... general.

Good luck man, and nice choice of a processor.

 
knowing what features does what is one thing... actually knowing HOW to use them is even more difficult.

that is a very complex unit. complex, but great.

 
That's an expensive and complicated piece for someone to be setting up who doesn't even know where to start. We cannot possibly tweak your system for you over the internet. Id suggest sticking around here a while and learning the ropes. That processor has many functions, it would take all day to explain each of them to you. The owner's manual should cover the basics. Then, come back here with any specific questions you have. Another good trick to learning is pay your local shop to tweak your system while you listen in and ask questions. That would be a big help to you.Just making a general question of what buttons to start hitting on your processor to make improvements is too.... general.

Good luck man, and nice choice of a processor.
finding a competent shop would be the bigger battle.

 
Phase.....lets see how to explain it.....if you have a speaker connected correctly, you run the positive wire to the positive post on the speaker and the same with the negative. But if you reverse the polarity on a different speaker (negative terminal to positive wire) the speaker will be out of phase. You can try it with the unit. Sometimes it is a good thing to reverse phase because it sounds better but sometimes not.

 
This was a post from Elitecaraudio.com written by cmusic. Hopefull it helps:

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 step’s 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 driver’s 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 speaker’s 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 “acoustic” 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 midbass’ 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. (We’ll 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 –6.

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 “My Disk” 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 band’s left and right eq controls as a balance control. This is very similar to the head unit’s 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 band’s 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.

 
i guess i will have to start somewhere.

What is phase?
There are two concepts regarding phase; Relative phase and absolute phase.

Absolute phase refers the drivers themselves. When a speaker is wired "in absolute phase", it will excurt outward with the peaks in the signal and inward with the valleys of the signal (in relation to the original signal on the source material...i.e. the CD). If the driver is "out of absolute phase", it will excurt inward with the peaks and outward with the valleys. This can be done two ways. First is by reversing the wiring of the speaker leads (positive amplifier output to negative speaker input). In which case the peaks and valleys of the signal the amplifier is outputting matches that of the original recording on the CD.....but because the speaker leads are reversed, the speaker will move inward with a peak in the signal and outward with a valley in the signal. The second way to reverse absolute phase is the method the H701 uses...it "inverts" the signal prior to sending it to the amplifier. So while the speaker is responding as it should to the signal it is receiving (it excurts outward with peaks and inward with valleys), the signal the speaker is receiving is exactly opposite that of the signal on the original CD (the peaks in the signal the speaker is receiving is actually a valley in the signal on the original CD). In both instances it's said to be "180 degrees out of phase". And at this point we are strictly talking electrical signals.

Relative phase refers to the acoustic interaction of sound waves in the listening environment. THIS IS WHAT IS VITALLY IMPORTANT. If two sound waves meet each other at some point in space and the sound wave from speaker 1 is at a peak and sound wave from speaker 2 is at a valley (they are "out of relative phase"), they will "destructively interfere" and cancellation of the sound wave will occur. If the two sound waves are both at peaks or valleys (they are "in relative phase"), they will constructively interfere and combine in amplitude. Destructive inteference is generally a bad thing and something we want to avoid. So if we have a situation where we have destructive interference, how do we manipulate this? Well, by switching the absolute phase of one of the speakers! This is why the H701 possess the ability to reverse phase by 180*

Clear as mud ??

Here are some other things regarding phase for you to follow up with;

http://www.betteraudio.com/geolemon/Phasing/Phasing.htm (good read, but keep in mind he has the terms "absolute phase" and "relative phase" reversed)

http://www.elitecaraudio.com/forums/showthread.php?threadid=97540

http://forum.elitecaraudio.com/showthread.php?threadid=81356&pagenumber=1

 
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rjcastr

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