Room Acoustics Forum by Rives Audio

Welcome! Need support, you got it. Or share you ideas and experiences.

Return to Room Acoustics Forum by Rives Audio

Message Sort: Post Order or Asylum Reverse Threaded

Quiet room measures 42db SPL?

173.64.208.196
Posted on December 2, 2012 at 12:45:17
hifi1959
Audiophile

Posts: 45
Joined: May 12, 2011
 Is your small room have a noise floor of 40 some db?

What is it that runs my spl meter up to 40db and at what level does one measure sweeps of room for acoustic measurements in REW?

 

Hide full thread outline!
    ...
RE: Quiet room measures 42db SPL?, posted on December 3, 2012 at 08:49:01
jkloganjr
Audiophile

Posts: 18
Joined: November 23, 2012



My average is about 50db. But looking at a spectrum analysis, most of it is at very low frequencies.

In my case, from 200hz and up, the graph show <32db. So in the important ranges, its much better than the average of 50db might indicate.

 

RE: Quiet room measures 42db SPL?, posted on December 3, 2012 at 09:03:56
Ethan Winer
Manufacturer

Posts: 1709
Location: New Milford, CT USA
Joined: December 3, 2003
 When using REW it's important to play the sweep at least 40 dB louder than the room's background noise. Otherwise you won't see the full extent of nulls, which can be 40 dB deep (or even deeper).

--Ethan

 

RE: Quiet room measures 42db SPL?, posted on December 3, 2012 at 11:32:57
hifi1959
Audiophile

Posts: 45
Joined: May 12, 2011
 So . . . is there a db level that is recommended for sweeps other than 40 db above noise floor?

That would put me at a measure of roughly 85db.

As a follow up question . . . Most of the time I listen in the 85db average range. Some of the rock music I listen to I am at 102db average during those listening sessions. Should one sweep where one listens?

 

RE: Quiet room measures 42db SPL?, posted on December 3, 2012 at 12:47:34
jkloganjr
Audiophile

Posts: 18
Joined: November 23, 2012
 While measuring 40db above the noise floor maybe ideal, your going to see big lulls (if you have them) at 25-30db above the noise floor also.

In my way of thinking, whether a lull shows up as -25 or -40 makes little difference in the sense that I am going to treat it in any case.

Most of my sweeps I run at 65-70db and I have no trouble finding those areas in need of attention. Loud sweeps annoy me and after hours of them cause me anxiety :)

Whats more important than +40db > noise floor sweeps, imo, is to make sure your running 1/24 octave smoothing (1/48 is ok also). 1/3 or 1/6 octave smoothed results gloss over way too much.

 

Page processed in 0.026 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]