Review Details

1.25" Dia Sorbothane Hemisphere Rubber Bumper Non-Skid Feet with Adhesive

1.25" Dia Sorbothane Hemisphere Rubber Bumper Non-Skid Feet with Adhesive

Product Review (submitted on September 18, 2015):
Used these under my JBL LSR305 monitor speakers on a glass table and actually had a genuine jaw dropping moment. Obviously a glass table is not ideal for monitoring however that's my only option right now and after experiencing these I will be using them on whatever surface my monitors sit on, stands included to achieve proper frequency levels for mixing, recording and producing.
Test 1: Speakers only on glass table. Used palms and fingers to feel the area next to the speakers and under the table where the speakers sit. Results : Clear, obvious and strong vibration/humming of all low frequencies resulting in a false sense of bass throughout the table. Used Britney Spears' "I Wanna Go" as the reference song as it has strong bass frequencies from start to finish.
Test 2: Placed 4 of these under each speaker (round side up supporting speakers) still sitting on the glass table. (Did not remove adhesive on flat side) Results : I kid you not, a 90-100% reduction of the same exact false low frequencies at 90+db. I'm in disbelief that these little black crescent shaped squishy "bumpers" could absorb and dissipate that much bass before it reached whatever surface the speakers would sit on.
Test 3: Set my JBL LSR305's on these bumpers again (round side up adhesive peel away still intact) which in turn fit perfectly on each point/leg of my ISO Acoustic L8R155 speaker stands. Results: 100% reduction of any humming, buzzing or vibration of bass frequencies traveling through the table.
You can normally feel the bass traveling through the ISO Acoustics however it's severely reduced when the speakers have these bumpers in between them and the stands resting points.
Conclusion : I can't believe this material isn't used in every monitor stand or promoted more as a decoupling method for speakers. I'm not sure how the one reviewer here did not experience these results. I tried Blue-Stick (Tack) and the results didn't come close to this. Incredible and well worth the $20+. While I also recommend the ISOAcoustics as they give your monitors a much needed lift to ear height and an apparent 80-85% bass reduction which greatly improves and tightens bass response and boosts the clarity of the mid and high range, I wouldn't hesitate to place my monitors on these bumpers alone, which cost a 5th of the price of the ISOAcoustics and in my opinion decouple and dissipate/absorb low misleading bass frequencies much better. However the ISOAcoustics give an unmatched floating/raised height effect which is extremely beneficial. The reaction I had the first time listening after placing my speakers on the ISOAcoustics is subtle compared to the reaction these sorbothane bumpers gave me. If the ISOAcoustics are out of your price range these bumpers placed on a regular or DIY stand would have the same decoupling effect.
Note: I have not peeled the adhesive off of the underside because I'm hesitant to have adhesive glue stick to the ISOAcoustics resting points but I can only imagine the decoupling effect would be even greater if the 3M paper peel (reflective material?) was removed. It also might not make a difference as it is extremely thin.
That said, combining both the Sorbothane bumpers with the ISOAcoustics L8R155 like I have gives an incredible kind of mind blowing result with more credit going to these bumpers than the stands. Extremely satisfied.