Spl Calibration

[broke]

After finally getting around to calibrating properly follwing the guidelines in Mark Techer's sticky, I noticed that all 5 speakers needed 1db or less calibration to match each other......no problem, however, when I calibrated the the sub (on the 80db setting on the meter and peaks set to 79db) it came up with a -7.5db calibration figure. Is this just relative to the volume setting on the sub itself?

Upon listening (and watching) some seens from Black Hawk Down in uncompressed PCM, the LFE effects felt a little lean in comparison to previous settings.

I checked various spots in the room for bass loading and (to my surprise) the wasn't many bass loaded nodes within the room. (1-2db variation from listening position)

Is it detrimental to the sound produced from the other speakers to set the sub slightly higher (frequency cancellation, domination etc)?

I know the sub is meant to 'underpin' the sound for movies etc but the moments when a real rumble was required I just felt things needed a little more impact.

Might test out Transformers (just in DD) in the street seen when Ironhide (i think that is name) does the cartwheel and see what the outcome is.

Any feedback would be appreciated.

Cheers

[OzMillsy]

It maybe a case of what you're used to, has become what you like and seems right.

If you've been running the sub at +7.5db higher than the other channels for some time, this could well be the case.

If you havent already, try running test tones at various freq levels - to see if there are lows/nulls at certain frequencies.

You'd want the sub to hit 80db's (or close to it), evenly, at 40, 60, 80, 100, 120 Hz. If any of those frequencies are much lower than the other, this could be contributing to the problem. Then play the placement game, to try and fix it.

[broke]

It maybe a case of what you're used to, has become what you like and seems right.

If you've been running the sub at +7.5db higher than the other channels for some time, this could well be the case.

If you havent already, try running test tones at various freq levels - to see if there are lows/nulls at certain frequencies.

You'd want the sub to hit 80db's (or close to it), evenly, at 40, 60, 80, 100, 120 Hz. If any of those frequencies are much lower than the other, this could be contributing to the problem. Then play the placement game, to try and fix it.

Thanks for the tip, will try the meter at the various frequencies mentioned and see what the outcome is.

I 'll try the sub in a few different spots (limited) and see how I can improve it.

Is it possible to do the EQ measurement for the room via the provided mic THEN set the db levels manually? or would this interfere with the original EQ parameters?

Cheers

[OzMillsy]

Dont know, I havent used the provided mic (yet).

I just use an spl meter, and a test tone cd.