In most cases you are going to be better off fixing the speaker to the floor even if you are not on slab.I am afraid that fixing the speaker to the vibrating floor, and letting external vibration in particular of each one of the speaker resonate near one another, will not do the job.... :)
Springs under turntable
I picked up a set of springs for $35 on Amazon. I intended to use them under a preamp but one thing led to another and I tried them under the turntable. Now, this is no mean feat. It’s a Garrard 401 in a 60pound 50mm slate plinth. The spring device is interesting. It’s sold under the Nobsound brand and is made up of two 45mm wide solid billets of aluminum endcaps with recesses to fit up to seven small springs. It’s very well made. You can add or remove springs depending on the weight distribution. I had to do this with a level and it only took a few minutes. They look good. I did not fit them for floor isolation as I have concrete. I played a few tracks before fitting, and played the same tracks after fitting. Improvement in bass definition, speed, air, inner detail, more space around instruments, nicer timbre and color. Pleasant surprise for little money.
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@uberwaltz - I haven't had much success with the cheap Chinese knock-off of the Solid-tech Isoblack, perhaps the Nobosound knock-off is better? Using the springs you tried earlier, and placed under your sub, you could add mass under your TT with a heavy shelf to try mass loading them? Are you able to tell me more about the springs under your sub? Wire used, how many turns, spring rate etc? |
Rix. If you had asked when I bought them I would have had all of those answers as I researched it a fair bit. Tbh now after 9 months or so since purchase I do not have that information to hand or memory... getting old ya know! Yes I guess I could have mass loaded with something, not that I had or have anything that would likely fit the bill for that purpose lying around. But worth some pondering for sure. |
The adjustment of the compressive rate like you already know is very important.... The nobsound will do the job.... easy to adjust, because a variation around 2 to 5 pounds on the 80/90 pounds of possible compressive weight is very audible.... I use them without any negative effect on all spectrum.... But the adjustment must be done around 3 or4 % of the optimal compressive force.... It is possible the effect even with this little variation in compressive force is very audible....It is way more easy to do with the addition or substraction of slab of 5 pounds each than with the substraction of one or 2 or 3 springs.... :) If you substract one spring on the seven you are left with a ratio of 1/7 , 5 pounds is under this ratio of compressive force, it is around 2 times more refine adjustment than taking off only one spring at a time( 2 five pounds slabs equal roughly one spring if we equal the maximum compressive force around 85 pounds on the 7 springs) ...When i speak of taking off one spring i means in each of the four boxes under each speakers.... :) I prefer to add weight because i want my speakers damped.... |
@slaw I've experimented with weights on top of speakers in the past, not on springs and found that it's easy to overdamp the cabinet. Not always a good thing.Are you sure by adding the mass, you didn't actually overdamp, but perhaps moved the resonant frequencies into modes that sounded worse? TMD dampers on top of a loudspeaker cabinet, the likes of the ETI AMG topper. http://www.audiopolitan.com/blog/eti-amg-toppers-review/ I was an employee of the inventor, almost all you need to know what I mean, is found in reading that review. |
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