Springs under turntable
Putting the speaker on springs will make it worse.This is not my ears impressions... I know my ears are biased.... :) This does nothing for cabinet resonance, vibrating panels.2 set of springs boxes instead of one with small difference in load on them will damp the internal resonance...It is very audible... Audible immediately in the naturalness of timbre..... I know my ears are biased.... :) |
mahgister, You may hear what you say you hear, but the phrase "damp the internal resonance" as a mechanism for what you hear is unclear. In other words, as is so often the case in this hobby, we have a phenomenon on one hand and a hypothesis on the other, and we marry them often without much evidence. Can you say how a mass on springs placed on top of a cabinet can "damp the internal resonance"? I do believe that just placing a mass on top can lower the resonant frequency of the cabinet, but why the springs? |
mahgister, You may hear what you say you hear, but the phrase "damp the internal resonance" as a mechanism for what you hear is unclear.You are right, it is unclear, especially for me.... I only tried to convey my experience.... I tought previously that only springs fine tuned under my speakers could and would do the job... I was wrong.... Adding some mass on the load to compensate for the weight of the speaker itself and create a slight difference between the load on the springs that are under the speaker and those that are directly under the load on top of the speakers, create a better vibrations controls mechanism... The only explanation that comes to my mind is that the 2 sets of springs with a slight difference in compression decrease the power of the standing waves negative impact that are associated with resonance... But i am not a scientist by far... The only fact is the fact i observed relatively to the tonal accuracy with a second set of springs.... The results is amazing and audible immediately... Then i will wait for other’s explanation.... |
Added more of these things, now have them under the turntable, phono stage, amp, conditioner, and all 5 subs. Plus of course the different springs under the Moabs. Things were going great until I started noticing a really bad drone or rumble. Immediately assumed it had to be the turntable, and spent a lot of time tweaking and adjusting making sure everything was perfectly level. Thought I’d solved it a couple times but it kept coming back. Intermittent problems are the hardest! A couple times was sure it was solved, the record would play silent, but then comes the rumble. My big clue was playing Simon and Garfunkel Scarborough Fair, the lead-in groove would be nice and quiet at first until after several seconds the rumble would build up and be quite loud. If it was the motor, or bearing, or anything like that it would be there every record all the time. This was telling me it had to be some kind of resonance in the system. I had been using springs under most of this stuff for quite a while with no problems until recently. But now there were springs under the conditioner. Which is connected to a typically stiff power cord, also suspended. Which goes into the phono stage. Which is on springs. I remembered how much the low bass was affected by tuning the springs under the phono stage. Hmmm..... Well if its a resonance then could be what’s happening is an inaudibly small amount of low frequency rumble is making its way through the system back to the phono stage where its creating a positive feedback loop and what I’m hearing is like that horrible mic feedback only instead of a shrieking scream its this low bass rumble. Simple enough to check. Change the resonance, cancel the feedback, no more rumble. Wedged some stuff under one corner of the phono stage. Silence. Blissful silence. I think what is going on is now with everything suspended everything moves more freely and for the most part this is good. Beyond good. Great! But it really is tuning, and a little care must be taken to avoid having too many things with the same resonance. This will be highly system dependent. Look at my system. https://systems.audiogon.com/systems/8367 The conditioner is in a straight line between the sub amps and phono stage. The sub amps are one of the few things not suspended. Could be by springing the conditioner I unwittingly created a situation where the sub amps are feeding resonant energy right into the phono stage. I don’t expect many to have this problem- at least not until they get to where a lot of the system is suspended. Main reason I mention it is because, if you think about it, the same could be happening a lot more often than we think- just at a much less obvious level and without the drone that made this so (relatively) easy to track down. |
