[goatwuss]

Hi,

I am integrating Danny's direct-servo sub into my HT with Neo 2's as front speakers.

How do you usually go about dialing in the phase of the subwoofer? 

Are there any tricks, formulas or rules of thumb that take distance of the sub driver from front speaker baffles into account? 

Or is it mostly something that needs to be set by ear? 

Is it possible to nail this easily nail this with RTA measurements?

No one likes phase issues...  I'm hoping to nail this! 

Danny, do you have any advice on this?

Thanks,

Todd

[Danny Richie]

How do you usually go about dialing in the phase of the subwoofer?

Personally, I use my Clio measuring system to take some in room responses.

Are there any tricks, formulas or rules of thumb that take distance of the sub driver from front speaker baffles into account? 

The use of a cheap rat shack SPL meter and some test tones played from a CD comes in real handy.

Or is it mostly something that needs to be set by ear? 

You can do it by ear. Set the crossover point to where you know that you are getting some overlap to the main speakers. Then while listening determine what position on the phase control makes it the loudest (in phase) and what position makes it the quietest (out of phase). Then set it to the position with the most output and adjust the crossover point and gain settings for optimal blending of the subs to the main speakers.

Is it possible to nail this easily nail this with RTA measurements?

Oh yea, real quickly.

Danny, do you have any advice on this?

See recommendations above.

[miklorsmith]

Courtesy of richidoo and Robert Harley:

http://www.avguide.com/forums/subwoofer-phase#comment-617

I generated a 5-minute XO frequency tone on Audacity (freeware) and the whole operation took me like 15 minutes.  The "maximum null" is very easy to hear.