Dolby Digital Test Tones

[miguelj]

I want to calibrate my speakers using a SPL Meter and I need to generate some test tones.

All the tones that I get from the net are only stereo.

My question is what to do with the LFE and the Rear chanels in Dolby Digital?

Should I code the LFE and Rear chanels or leave them silenced? In my AV Reciver all the speakers are configured as small, an SW Otuput at Both, if I generate a tone at 40Hz and put it at the two main speakers then the AV sends that tone to the SW right? If so, if I put the same tone at the LFE chanel, is the bass is going to be stronger them if I leave the LFE chanel silenced?

How should I code the 5.1 chanel in my test tones? should I put the same tone in all the chanels or only in the 2 front speaker?

 

[Jase]

Hi

Why not buy a test disc such as AVIA or Video Essentials??

AVIA available from www.ovationsw.com

Video Essentials from www.ezydvd.com.au

At least you´ll know these test discs have all the their test tones recorded correctly and will help you balance your AV system properly.

 

[GOODMAP]

Or if you got Star Wars Episode 1 or Monsters Inc on DVD they both have THX Optimizer on them which provides 5.1 channel test tones.

 

[Apocalypse]

One thing puzzles me with test tones, to get 75db pink noise with Video Essentials requires a very high volume, to get 75db pink noise with The Ultimate DVD Platinum requires a lot less volume so which one is more accurate. I'd say the test tones at 75db that are closer to your listening levels are more accurate surely, your thoughts?