bass traps..which wall first

My understanding is that the MEGA LENRD are bigger. Size counts!

The MegaLENRD Bass Trap (Low-End Node Reduction Device) is extremely effective at smoothing out low frequency room nodes and is just a bigger version of the original best-selling bass trap. At twice the width (extending 24" along each wall, not 12" like the standard LENRD,) the bass trap is substantial enough to handle low-frequency problems in rooms of any size and is the only broadband absorber effective below 50Hz.

Foam is NOT a bass trap, unless it's 4' thick. Cotton, compressed fiberglass (703/705) or mineral wool are denser and wideband but become less effective below 200Hz. Even the commercially available membrane traps are limited due to shipping size and weight. A bass trap that works well to 50 Hz would be substantial and a wall in itself.

so then Ngjockey, what do you suggest? do you use any room treatments? you act as if all the current bass trap sold today are ineffective

That's not what I meant. You were asking about bass traps and foam just doesn't work for bass. It's mostly air but it works fine for mid to high frequencies and would be the choice for reducing highs without affecting lower mids. Denser material absorb lower frequencies and more of the upper frequencies for the same thickness. Well, concrete might be going too far but lead is used in the walls of many studios. Membrane panels (such as Realtraps) tend to be narrow band (100 to 300 Hz, optimal).

My only suggestion is to use the right material and type for your room and needs. However, Ready Acoustics bags seem like a bargain for general use and rigid fiberglass insulation can be found in the yellow pages.

I have built several membrane bass traps, including a couple that double as amp stands with granite tops. The 4' by 2' panels I built aren't very effective at 50 Hz either. For that, they should be about 8X4 and use thicker membranes. Not really practical for my transient nature. Moving 350 lb speakers is bad enough. I have also used custom futon pads (cotton only) and helped build tube and panel traps with compressed FG and mineral wool. Built some artsy diffusors for a friend in need too.

Here's an example: Get a section of 2" bedding/furniture low-density foam, large enough to wrap around your ears and then fold up a pair of jeans about the same thickness for the same purpose. Listen to your stereo with both and compare for yourself.

I think Ngjockey is just pointing out that you can't expect too much (if anything) from broadband bass traps (foam or otherwise) below 100Hz unless you increase your coverage/thickness significantly.