|
Speaker Asylum General speaker questions for audio and home theater. |
|
|
|
Speaker Asylum General speaker questions for audio and home theater. |
|
In Reply to: I understand - and will try posted by VynylTap on January 13, 2009 at 09:23:57:
It's the treble readings over 2000Hz. that are really far from accurate, and should be ignored! Much worse than the treble error corrections shown at the link (unless the meter has been redesigned recently).The Rat Shack meter uses C-weighting.
C-weighting is very useful for average SPL's up to about 90dBA
90dBA is very loud.
Our hearing doesn't work well for bass tones unless the bass is very loud.
That's why for most listeners (who don't listen to music averaging over 90dBA), C-weighting is the best measurement to use
C-weighting assumes bass at 20Hz., for one example, will need to be +6.2dB louder than 1000Hz. to sound equally loud, because our ears have trouble hearing deep bass.
Therefore, any sound meter using C-weighting will read 6.2dB LOW at 20Hz. compared with an unweighted SPL measurement.
So, FOR ANY SOUND METER AT ANY PRICE, the conversion factor from C-weighting to an unweighted measurement at 20Hz. is +6.2dB.
It's not fair to combine a +6.2dB conversion factor that applies to ALL sound meters, with a +1.3dB error correction that applies to one sample of a Rat Shack sound meter, and then claim Rat Shack meters need a +7.5dB "error correction" at 20Hz.
That falsely makes the Rat Shack meter look bad.
In reality, a Rat Shack meter's C-weighted readings should be +/-2dB in the 30 to 100Hz. range ... and merely adding +1dB to the readings is likely to improve the accuracy to +/-1dB = very good for a meter that doesn't cost $300-$500.
Note: Measurements of sinewaves under 30Hz. may not be useful because a big portion of the sound energy may be harmonic distrortion (aka doubling) at higher frequencies which would just make a subwoofer look more powerful than it really is at 20Hz., for example.
.
.
.Richard BassNut Greene.....................................................................
The "Cliff Claven" of Audio
and the "The Floyd R. Turbo of Bingham Farms Michigan"
Edits: 01/14/09
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- The Rat Shack Meter IS most useful for bass -- most people are clueless about "error corrections" - Richard BassNut Greene 09:11:53 01/14/09 (2)
- so really, the graph should look more like this... - VynylTap 14:29:39 01/14/09 (1)
- Yes. - Richard BassNut Greene 14:49:10 01/14/09 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
