I have the ASC Subtrap which is similar but taller, raises the sub 18'' off the floor. My unit helped tighten the bass and helped with "room boom".
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I've used the Auralex SubDude and Great Gramma with good results under my Velodyne subwoofers.
Here is an older thread where other A'gon members have shared their thoughts on the Auralex SubDude. Seems to be the real deal.
Jedinite24-thanks for the response. I'm using a downward firing with passive radiator right now and just received my SubDude, i will add my input after i get a feel for the new addition.
Kkm-i agree with you that the build quality is cheesy. My freakin' logo is not even centered! Its about 1 1/2" off. Wow Auralex.
No problem. I wasn't much help but please definitely share your thoughts on the subdude. I know it helped in my case.
I've seen the SubDude go from $50 to $60 each new from various online e-tailers.
Sometimes you can get lucky on the secondary market and get them for min $25. I used to check CL all the time for Auralex or other room treatments. Sometimes I would luck out.
I used a similar Auralex Gramma under a Vel DD-15 for a time. It is effective in isolating the room from the sub, but not much good in communicating LF with precision. A Star Sound SP-1 with Audiopoints brass cups gives more delineation in the sub bass region and reduces muddiness that cabinet resonances will otherwise introduce into the upper bass and midrange.
Interesting. I need to do more listening. I think I might experiment by putting some weight on top of the sub to damp the movement a little. I've heard people putting bags of lead shot on top of subs.
On the subject of monitors, has anyone tried the Auralex Mopads? I've read mixed reviews. Some people seem to prefer the Primacoustic recoil stabilizer. Unfortunately, due to decorating factors and a small house, my monitors are on a built-in MDF cabinet. It's extremely solid, but it is coloring the sound somewhat.
Mateored, rather than lead shot, you might try a bag of microbearing steel from eBay or a foundry supply company. I use this inside the enclosure and in an ultrasuede bag placed on top of my modified Merlin VSMs. The Merlin is particularly active with vibration across the top of its cabinet. Microbearing steel is more reactive than lead shot in absorbing vibration and is of course non-toxic.
Several years ago I got a fairly inexpensive 1x10 powered sub. I felt it could play cleaner. I had a slab of granite I had gotten from a Tandy store (just $20) for leatherworking. I placed the slab on the subwoofer (with a layer of shock-absorbing shelf liner in between) and voila! It made the bass much cleaner and more linear-sounding.
I agree with David and Johnny. IME, adding weight to the top of your sub results in a noticeable improvement in pitch definition and transient response in the bass.
I have my JL Audio sub sandwiched between weights and a platform.
--On top... 40 pounds of weights concealed inside a Bright Star Big Rock platform. Under it...
--A large piece of industrial felt. Under it...
--The sub itself. Under it...
--2" Black Diamond Racing carbon fiber "pucks." Under them...
--3" maple platform. Under it...
The final result looks like this.
I did that in increments, and I heard improvements with each step, including when I placed carbon fiber pucks between the sub and the maple platform, bypassing the sub's soft feet.
I recommend trying something similar, if you're inclined.