Phase for 2?

[howie85]

Phase for 2 subs

Ok, I have been messing around with 2 subs both, velodyne 15's, trying to get them to sound good in opposite corners. I did not want to have the lopsided look with them both on the same side. Today I finally broke down and tried them stacked in the same corner....
I wish I would have tried this some time ago. My question is now, is there any particular phase adjustment to start from as apposed to guessing 0-180 something to get me in the ball park? What am I listening for when i change the phase? I do not have any meters or such so I have been doing it by ear and It was never quite right before but it seems much better now. I guess i can get a rad shak meter it it is absolutely necessary. Thanks , Curt

 

[vinyl]

You might run both in "Stereo Mode"...not dual mono, you won't lose the LFE in the 5.1, IF you set the L/R speakers in the receiver as large and sub OFF, however, subs need to be close to the L/R speakers...merely an option for 2 identical subs to explore

 

[howie85]

That is how i started out. I had a resonating sound that was really bothering me so I started changing things around and found the bass to be more detailed where they are now. I was just wondering how changing the phase will help the sound from this point. Thanks

 

[vinyl]

General rule of thumb: The phase is correct when the sub sounds louder, if not, leave it at 0.

Unless the complete set up is calibrated to matching levels with a SPL meter, the phase question is really secondary at this time.

This may also have contributed to the “resonating sound” you heard in the other configuration; it may sound better to you now partly because the corner loading may have smoothed out some peaks and valleys? So, in the great scheme of things you really don’t know how well or not the speakers/subs are blending as a whole, and the subs may be running too hot….at this stage you’re merely guessing.

I strongly suggest getting the SPL meter and start from there, a good map is always handy to have when traveling to the unknown.

 

[vinyl]

howie85,

This is want you want/need.

 

[crashguy]

I would set them both at 0, or both at 180. If you set them at oposite, they will work against each other instead of in tandem like you want.......you bass freak!!!!

( I can say that as I'm one too)

 

[howie85]

I resemble that remark

 

[howie85]

vinyl, I was thinking about getting that meter and have read about the use of it in conjunction with some device that will allow for correciton of the spikes in certain frequency ranges. I was wondering if i get that meter then i would need the test disc for bass tones then something like a BFD to correct the problems? I guess I was hoping for a shortcut to get me by until the automatic room correction that is now coming out gets more refined.

 

[vinyl]

Whoa there partner, you’re climbing the mountain before you overtake the hill.

First get the meter; doesn’t your receiver/pre/pro have a test tone generator?

If not, discs with test tones are easy enough; you can also download/burn specialty test tones.

I wouldn’t concern myself with any other gear at this point the goal here is to achieve the same levels in all speakers and then matching the subs levels to them, after that you can set them -/+ to your taste.

Lot easier to experiment when you can see results on the meter, i.e. moving subs for better blending, the extra 2/3 db on that center…etc. etc. etc….the meter is the biggest intelligent bang for the buck Have fun with it.

 

[crashguy]

Also keep in mind that due to phase variance peaks, where you position the subs, and what phase setting you use will not be the only variable you will have to deal with. PLACEMENT OF THE METER will vary the results as much as any setting you can adjust. On my Yamaha 2500, moving the YAPO mic a few inches (yes - less than a foot) made a total difference on the results of the auto set-up.

Just another thing to keep in mind, from a bass freak to a bass freak....

....you can never have too much rumble.....

 

[howie85]

Im still waiting for my e mail notice on the winner of the Axiom sub..
see my stuff here http://forums.audioholics.com/forums/showthread.php?t=6974