Last weekend while my wife and daughter were away I decided it was a great time to do a little baseline sound transfer testing.
The space is open..... wide open and is directly below... well most of the house. The theater area is directly below the living room and front entry.
As I am doing drop ceiling, I know that that will not prevent much sound from transferring up to the main floor.
I do plan on doing insulation between the joists in the entire basement and am debating on doing drywall between the joist also.
Foot fall with everything open right now is terrible
In this post I want to document the baseline results that I got and how I did the test so that I replicate in the future when materials have been added
I set up my AVR with my Anthana speakers set to the image below
Downloaded a white noise track from http://www.audiocheck.net/testtones_whitenoise.php
Did three measurements with my radio shack db meter. volumes on the AVR where Off / -10 / 0
I got to say that white noise at 0 is damb annoying!!!
They way the equipment was set
I choose white noise for it "flat" frequencies
Results of Tests
With everything off and no one home:
MLP = 31db
Just outside theater pocket doors = 32db
Mid upstairs living room = 30db
So pretty quiet in general
At -10 on the AVR with white noise track
MLP = 81db
Just outside theater pocket doors = 58db (-23)
Mid upstairs living room = 46db (-35)
At 0 on the AVR with white noise track
MLP = 88db
Just outside theater pocket doors = 71db (-17)
Mid upstairs living room = 58db (-30)
I find it interesting that with an 7 db rise at MLP that the reduction in sound is not linear to that..... I'm sure there is a good explanation.... its just not what I was expecting.
Thought I would see the living room closer to 53db.....
If there is better way that I should have done the test PLEASE let me know before I get to far ahead and can't retest baselines
I was wearing earplugs during this cause it damb loud and annoying, but I took them out briefly to "subjectively" see what it was like at MLP and upstairs...... yes is was quieter upstairs but still to loud for my liking.
So this leads me back to my thoughts on installing drywall and green glue between the floor joists to try to aid in the sound transfer not only footfall but sound going up also
Now is the time to do it as I am almost ready to install the insulation
What are peoples thought on this?
My thought was to do the area above the theater.... not the entire basement, this would require ~9 sheets of drywall and 9 tubes of GG, estimated cost per layer is $300
I know there is flanking to worry about also but to do the entire basement would be stupid in cost and labor..... plus there are cold air returns and HVAC that is in the way
My theory is that if you put anything in the way of a sound wave it is going to help.... how much depends on the material and where you are measuring.
Example if I do between the joist only above the theater and measure directly above the theater there should be a measurable difference...... right?
If I yell at some one 10 ft away and then do it again with a wall in the way the yell is reduced.... yes sound travels around the wall also but it is reduced
I guess I am trying to figure out if the cost and effort is worth it when only part of the ceiling is being done??????
Found it interesting that solution three at the Sound Proof a Ceiling link
(insulation, double drywall, GG and clips) gets a 6 star rating when adding 1 layer between the joists goes to 8 and two between joist to 9