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40hz room mode RPG Modex Corner trap?

Hey guys,
Looking for some help with some room modes I am battling. Main offender is 40hz mode. (very typical with 8ft ceilings I suppose) I have several ASC tube traps that have helped a lot, but at this point the don't need much more broad bass damping just 40hz damping as the peak there is way above everything else.

So, two questions:

1. Has any one used the RPG Modex Corner trap?
http://www.rpginc.com/products/modexcorner/
Seems to be exactly what I need as they make a 40hz model. How effective are these? I think that to make a significant difference I may need so many that the cost will kill. Would 2-4 make a difference?

2. Any other ideas to kill the 40hz room mode short of an eq like the PARC?

Thanks
Nik
nikturner920
rives
953 posts
 
If we could deal with 40 Hz effectively passively we would not have made the PARC. We have tried the Modex--and we love RPG products and use them all the time in our designs, but we have not gotten good results with the Modex. At 40 Hz, there's a lot of energy and a long wavelength. The only real passive option is a custom designed and built Helmhotz resonator. It can do the job--but it's not easy to build these properly, particularly if it's a high Q resonance and greater than 8 db.
cmo
471 posts
 
Nik,

Although they are more of a broadband solution, you might want to look into the Mondotraps made by Realtraps. They only absorb under about 100Hz or so (so your room doesn't become overdamped in the higher freq.). They are a lot cheaper than the RPG's........... Don't know if they are more/less effective, but certainly a higher Q.

I recently installed four of them alond with some of their other products in my listening room to great effect.

Chris
eldartford
4,262 posts
 
I understand that the PARC might be a bit expensive. However, the Behringer DEQ2496 would do the job for you. See the several threads about this remarkable unit. By the way, Rives audio will tell you that LF room resonances, like 40 Hz, can't really be controlled by room treatments, and that is why they came up with the PARC.
nikturner920 OP
144 posts
 
Thanks for the info. I have a lot of respect for the PARC from everything I've read, and actually I've got a huge amount of use from the rives test cd with the rat shack meter while doing speaker placement and adjusting my asc treatments. $3k is probably too much for me at the moment though, wish there was a cheaper version that did just one mode.

Rives, is your thought on the Modex what I was thinking that it would take so many that it would be better to just use a PARC? Also curious if you have an info on building a Helmhotz resonator? Not actually out of the question as I have access to shop and lab equipment and would be looking at a 5-8db cut if I use optimum speaker placement.

Mondotrap looks interesting, may work in a corner for me.

I'll check info on the DEQ2496, probably stupid not to try it for the price. Probably would shift my direction to using an out board dac or something since my current digital player is optimized for tube analog out and doing A/D/A would give me an aneurysm. ;-)

Nik
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