Mass Loaded Vinyl (MLV) Acoustic Treatments - A Question

I rarely post here but seeing that this is right down my alley, I thought I'll chime in.
I've been in the Industrial Acoustics field for almost 20 years and in my experience the best product for low frequency attenuation is Rockwool.
Fiberwool would be the next one, foam being the least effective among these three but does work once the density is suitably high.

I've treated my room accordingly and the sound is absolutely fantastic.
I will add some pictures of the back wall, to my virtual system, to try and show what I'm talking about.
Wooden diffusers have also been used to a great effect.

I don't think MLV would help in taming low frequencies

I'm not an engineer, just someone who's in the business of manufacturing Sound Attenuated Enclosures.

Apologies if I came across as condescending, just that I'm not used to writing here, prefer reading.   
-S

@shahzada123 

Any chance on you posting those pics? I'm starting in on room treatment and you sound like you know what you're doing..

I just finished my new room, just posted in All Out Assault, and I incorporated MLV on the ceiling of a 16 x 20 room. It cost me $500 for the materials. I have done many rooms and this is the first with MLV. Was it worth it? Overall it does help (living room is directly above) but it kicked our butts getting it up. I used a drywall lift and still had to cut the 15 foot rolls in half to have a chance in cranking it up to the ceiling. I had to screw it in and then go back and add some nails. We taped all the seams as well.

The heating ducts will ruin the effects of MLV if you don't treat them properly. DOn't ignore them, they carry everything up and away.

My ceiling is 16 OC joists with rockwool in it, MLV, hat channel, 2 layers of drywall with greenglue, then diffusion and absorption to taste. I'll try to add some of the construction pics here but over on AudioCircle my complete room build is documented.

Hi all,

I have nothing that compares with bugredmachine’s extensive "ground-up" installation, but went through a challenging time damping the excessive low/mid-bass frequencies in my 15’ X 24’ X 9’ room.

I read a ton of stuff by Jon Risch on another forum and built floor-to-ceiling SEALED corner bass traps using 2" thick by 24" wide dense fiberglass panels (not the loose pink in-a-roll kind you buy at home-improvement stores) found at a builder supply warehouse and common 1/2" thick 4" wide plywood planks to build the frame around the fiberglass. Covered them with an attractive acoustically transparent fabric to match the room and to keep fiberglass particles from entering the air in my listening room. I used a thick, yet pliable rubber garage-door gasket material to seal the traps into the front corners of the room (behind the speakers) all the way around the frame.

These worked wonders to eliminate the exaggerated mid/low bass in my room without overdamping the overall sound. Pics can be seen on my system page.

I also built smaller 2" thick 24" X 48" panels for side-wall reflections using the same materials and construction technique (but unsealed) that are place at the midpoint between my speakers’ front baffle and my listening position. Audible improvement in imaging and soundstaging.

I recall that it cost me around $500 total plus a few days of dedicated construction/installation time.

I hope this is helpful.

Best to you all,
Dave