Room Treatment Help

@keeferdog 

Unless you look forward to all the time (a lot) and effort with trial and error trying to dial in your room just consult an acoustician. Jeff at HDacoustics is extremely good with smaller rooms  and can design the treatments required for a great sounding room. Also a corner set up like mine might give you the best sound with your room being almost square. Good luck!

keeferdog,
The echo sound when you clap your hands is likely flutter echoes between two hard parallel and untreated surfaces while the weird resonance is likely a room mode.  Treating a room your size is challenging due to its small size.  For example,  the theoretical decay time based on your room dimensions is just over 200ms which is the bottom limit of a generally accepted 200 - 500ms rule of thumb.  You don't want to line your walls with absorption which would lower it further and make listening uncomfortable like a quasi-anechoic chamber.  Instead, you could opt for bass traps of 6" thickness with a wooden facia to help preserve the mids/high frequency decay times to avoid an overly dampened room.  For the sidewalls, use reflective boards on an angle to deal with 1st order reflections from the closest speaker (L speaker->L sidewall) and farthest speaker (R speaker->L sidewall, and vice-versa) to create a quasi-reflection free zone while maintaining mid/high frequency energy.  Behind you in the corners and centre of the back wall place thick absorption panels, and place on either side of the centred panel 2D Skyline or 2D QRD diffusion panels of about 4" - 6" depth in order for you to sit 5-6 feet from them to help kill slap/flutter echoes.  On the front wall place 1D QRD diffusion centred on the wall with bass traps in each front wall corner.  With the bass traps having a wooden facia (See GIK Acoustics for example), sidewalls having angled wooden boards and the backwall a combo of diffusion+absorption that leaves the floor and ceiling to treat.  Place a small wool rug and underpad just large enough to capture the floor 1st order reflection bounce and 2D Skylines for the ceiling.  This combination of reflecton/diffusion/absorption of bass should go a long way towards improving your sound quality.

It'd be good to know what the RT-60 is in the room. A general rule of thumb for hi-fi listening is around 300ms, and fairly even through the frequency band, rising a bit as it goes into the bass. 

Absorption is best applied in multiple smaller panels rather than large single panels. Break large flat wall surfaces into smaller reflective zones. Tall, thin vertical panels with a mix of diffusive and absorptive properties are ideal, as their edges will scatter sound more horizontally than vertically. One goal is to break up the fewer strong reflections into many more weak reflections that are spaced apart, averaging about one per millisecond reaching your ears. So about 300 reflections before it fades below audibility. That will ensure an open and lively sound that is very neutral and low in room coloration.

Hello @keeferdog 

try to call ATS (  Acoustic Panels by ATS Acoustics  )

They help me a lot. I used REW to determine what my room was doing and used that information to help ATS tech support better understand my situation,

If you do NOT have REW, ATS tech support will also help you. I had done 2 rooms, and they were spot on. if you look at my profile pic, you will see the ATS treatments they had advised me to use

Good luck

Don't buy anything until you do analyses on your room dimensions.

https://amcoustics.com/tools/amroc?l=12&w=10&h=9&ft=true&r60=0.6

There is your room in AMROC and it looks pretty good as far as avoiding modes piling up. It also suggests approx 89 sq ft of absorption (Sabines). 

2 inch panels for higher frequencies, 6 inch bass traps or thicker if serious.

REW is your friend.

See this recent thread as well:

https://forum.audiogon.com/discussions/room-analysis-how

You're getting good advice but don't rush to spend money on panels until you understand what you need.

I prefer Acoustimac panels because their backsides are solid ply and it makes it easier to mount onto unusual surfaces.

GIK is a great company as well. Lots of them out in the wild. OC 703 is typical for high frequencies and Rockwool/fiberglass is typical for bass. (not the pink stuff)