Axiom Home Page Forums General Discussion Home Theater Avia Disc & Sub-Woofer Calibration...

I think the 75 db might be the standard to allow for headroom of various speaker sensitivities in a system and still achieve the 85db movie standard.

I guess you could clibrate to 70 while using the disc and then to 75 when using the pink noise from the receiver, as the receivers output is set at 75db. The biggest thing is maintain the same speaker levels all around.

Just to be clear I was thinking it would be good for speaker + subwoofer pairs where each pair is hooked up to it’s own channel L/main, R/main etc… otherwise I can’t see any use for them in a single or multi-sub system running off the subwoofer line out.

Clearly how they tell you to use those other test tones is very confusing.

Good question Rick, and sorry I could not answer your question last night. I may try my new AviaII disc but I admit, I was confused by the calibration for each speaker.

Rick,

That alternating test between sub and channel is for setting your crossover point. Or, at least that's what I use it for. Play with it some and you'll changing your crossover (at the channel level) will change the spl db reading on the meter.

Thanks Mike, Randy and I were talking on the phone last night and actually touched upon whether it was for setting the crossover or not, I assumed that normally the crossover would be set by the freq. response of each speaker in the manufacturer's specs? My center and surround crossovers were both set to 100 whenever I did the quick calibration with the 10+db difference between the mains, centers and surrounds.

What do you have your centers and surrounds crossovers set on?



Grunt thanks for the explanation, I'm getting old ... you'll have to bear with me.

Tom, it really isn't very crucial and the more important point is to get all the speakers equal in level, regardless of what SPL level is used for the calibration. Be that as it may, most(all?)receiver test tones are set 30dB below the maximum level of 105dB that movies are supposed to be recorded at, so if you adjust the levels to 75dB, then the movie sound(not applicable to music discs, which have no established standard level)would be played at the designated "reference level" when the receiver volume control was at 0 or whatever number was used during calibration. Of course, few listeners find that using the "reference level" for movies is acceptable for long-term listening in the home and use a a level 10dB or more lower.

Rick,

My twin M22 centers is set to 60, the QS8 surrounds are set to 100 and the M3 S-Backs are set to 90. Mains are set large.

I played with this function quite a bit. It really does make a difference in LFE / Low bass DB levels by changing crossover points. This is largly ignored because most receivers restrict you to a global crossover point for all channels.

Tell me about it Mike, my 2805 is a global setting, sucks.

That's one of the issues I have with the H/K Mike, although it does allow separate crossover adjustments for all speakers it only does this in increments of 20hz ... 40, 60, 80 and etc., that is why I had the surrounds and center crossover at 100. I did change the crossover for the center and surrounds to 80 last evening but I haven't really noticed much of a difference in my minimal amount of time with the system since then.

Mike just curious, why did you go with the 'large' setting for your mains?