THE_COW_IS_OK
03-31-09, 08:55 AM
Hi all, Just moved into a new home and my listening area is about 3m/4m/4.4m big with all concrete walls/ceiling/floor. My room need serious calibration and treatment and I am really frustrated with the lack of info when posting measurements or when saying the system is properly calibrated.... What does that mean specifically.
What should I target when optimizing the room?
k, I know for one I need to aim for
1) flat frequency response But which one?! Should I use steady state source or sweep/pink noise or MLS as source. Some software use varying gating time (around 1.5x cycle time) to follow psychoacoustics perceptions. Some auto calibration hardware aim for flat FR with 50ms gating time @all frequencies. Others maximize gating time (all measurements period >400ms)and add a house curve.... I mean there are so many ways of getting flat FR and I obviously can't meet all at once. For example, If I have a room mode @50hz that is 5DB higher then norm using gating of 70ms and 10DB higher using gating of 400ms, should I lower it by 5DB or 10DB? Isn't it music/instrument dependent?
2)rapid decaying Waterfall plot for bass region.
3)RT60. I know target time is room & personnel preference dependent. IS there consensus curve? My room is 53 cubic meter and I listen to all type of music. What should I aim at? Should be constant for all bands? Also, I hear no valid RT60 can be computed for the bass region in a small room. What to do in this area?
4) Minimize reflection reaching my ear arriving before 20ms(round 7m). After that, its all perceived as good echo..... Wonder how to accomplish this in a small room without placing absorbent panels @70% of room surface :D
4) Dunno what else to look for, you tell me....
all help appreciated.
Tkx for any input....
What should I target when optimizing the room?
k, I know for one I need to aim for
1) flat frequency response But which one?! Should I use steady state source or sweep/pink noise or MLS as source. Some software use varying gating time (around 1.5x cycle time) to follow psychoacoustics perceptions. Some auto calibration hardware aim for flat FR with 50ms gating time @all frequencies. Others maximize gating time (all measurements period >400ms)and add a house curve.... I mean there are so many ways of getting flat FR and I obviously can't meet all at once. For example, If I have a room mode @50hz that is 5DB higher then norm using gating of 70ms and 10DB higher using gating of 400ms, should I lower it by 5DB or 10DB? Isn't it music/instrument dependent?
2)rapid decaying Waterfall plot for bass region.
3)RT60. I know target time is room & personnel preference dependent. IS there consensus curve? My room is 53 cubic meter and I listen to all type of music. What should I aim at? Should be constant for all bands? Also, I hear no valid RT60 can be computed for the bass region in a small room. What to do in this area?
4) Minimize reflection reaching my ear arriving before 20ms(round 7m). After that, its all perceived as good echo..... Wonder how to accomplish this in a small room without placing absorbent panels @70% of room surface :D
4) Dunno what else to look for, you tell me....
all help appreciated.
Tkx for any input....