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Απάντηση: BELT DRIVE VS DIRECT DRIVE !!!!!
in environments with very high sound vibrations there is always the danger of rumble. This rumble can be compared with the "scream" of a microphone when held close to a speaker.
What happens with the microphone is that the sound it amplifies travels through the speakers back into the microphone therefore creating a loop. The turntables have a similar problem amplifying the grooves in a record and picking up the tremendous vibrations (i.e. bass and people dancing) through the surface they are put on which then creates a loop resulting in a low rumbling sound.
This problem is most common in clubs and at raves where sound levels get close to 120dB (115dB is the usual limit). There are many ways of eliminating this rumble. They include simple rubber bands or bungy-cords and big investments like building a shaft all the way down to the foundation of the building. It all comes down to eliminating direct contact between the turntables and the vibrations.
Here's how I do it: take a long rectangular box (made from any material you like) on which at least two turntables can be placed and with at least a 3in. depth. The box has to have an open top so you can fill it up with sand. The sand should be of fine grain and also make sure it is clean (don't go to the beach, buy it at a shop). Then all you have to do is put a sheet of fabric over the top so it looks good and no sand gets into your equipment. Place your tables firmly on top and your all set!
It's very cheap and very efficient. Just make sure the turntables are on the sand and not on the box, because the sand will absorb ALL vibrations. It speaks for itself that this is for permanent systems and not for mobile systems!
αποτι βλεπεις δεν αντεχουν και τοσο - γι αυτο ψαχνουν και για λυσεις στο συγκεκριμενο προβλημα
in environments with very high sound vibrations there is always the danger of rumble. This rumble can be compared with the "scream" of a microphone when held close to a speaker.
What happens with the microphone is that the sound it amplifies travels through the speakers back into the microphone therefore creating a loop. The turntables have a similar problem amplifying the grooves in a record and picking up the tremendous vibrations (i.e. bass and people dancing) through the surface they are put on which then creates a loop resulting in a low rumbling sound.
This problem is most common in clubs and at raves where sound levels get close to 120dB (115dB is the usual limit). There are many ways of eliminating this rumble. They include simple rubber bands or bungy-cords and big investments like building a shaft all the way down to the foundation of the building. It all comes down to eliminating direct contact between the turntables and the vibrations.
Here's how I do it: take a long rectangular box (made from any material you like) on which at least two turntables can be placed and with at least a 3in. depth. The box has to have an open top so you can fill it up with sand. The sand should be of fine grain and also make sure it is clean (don't go to the beach, buy it at a shop). Then all you have to do is put a sheet of fabric over the top so it looks good and no sand gets into your equipment. Place your tables firmly on top and your all set!
It's very cheap and very efficient. Just make sure the turntables are on the sand and not on the box, because the sand will absorb ALL vibrations. It speaks for itself that this is for permanent systems and not for mobile systems!
