My two öre.
There is calculations regarding tone arm mass, cartridge weight, compliance and so on.
That is for calculating the match between the cartridge and tonearm.
The calculation gives you a low Hz number as output. That is the resonance frequency that the whole assembly.
You want that frequency be out of the hearing range. If you are unlucky maybe you have not as optimal match there.
Second thing is that you can also stand and jump in front of your TT if you turn of the subs. What I trying to say it is not much worth if someone is telling that they can jump beside their TT IF they do not have subwoofers that that play easily down to 10Hz and doing that with some extra dB (not a -3db reading)
With your 3 15" subs you can get into that situation.
So first thing is to check your cartridge and tonearm. If that is a issue try to fix that so you get a frequency in the proper range. (We can’t work against physics).
Then there is unfortunately something called rumble filter that is a hi-pass at somewhere 15 - 20hz (depending on the above).
I implemented that in my miniDSP with a 24 oct/dB slope. (The miniDSP is in my opinion to noisy but therefore it is only used to my two 18" subwoofers there it performs 6 different duties. And this is one of them.)
Yes rumble is a nasty feedback loop noise. So you need to have speakers that play low down with adequate of db to yours tonearm assembly resonance frequency if you do that and a tell is when you play a track put your fingers on the sub surround and you can notice it pumping in and out that is not in the music that is your feedback loop. (It is so low frequency that you don’t hear it and those frequencies is the one you cut out and stop the loop with the rumble filter..)
There is calculations regarding tone arm mass, cartridge weight, compliance and so on.
That is for calculating the match between the cartridge and tonearm.
The calculation gives you a low Hz number as output. That is the resonance frequency that the whole assembly.
You want that frequency be out of the hearing range. If you are unlucky maybe you have not as optimal match there.
Second thing is that you can also stand and jump in front of your TT if you turn of the subs. What I trying to say it is not much worth if someone is telling that they can jump beside their TT IF they do not have subwoofers that that play easily down to 10Hz and doing that with some extra dB (not a -3db reading)
With your 3 15" subs you can get into that situation.
So first thing is to check your cartridge and tonearm. If that is a issue try to fix that so you get a frequency in the proper range. (We can’t work against physics).
Then there is unfortunately something called rumble filter that is a hi-pass at somewhere 15 - 20hz (depending on the above).
I implemented that in my miniDSP with a 24 oct/dB slope. (The miniDSP is in my opinion to noisy but therefore it is only used to my two 18" subwoofers there it performs 6 different duties. And this is one of them.)
Yes rumble is a nasty feedback loop noise. So you need to have speakers that play low down with adequate of db to yours tonearm assembly resonance frequency if you do that and a tell is when you play a track put your fingers on the sub surround and you can notice it pumping in and out that is not in the music that is your feedback loop. (It is so low frequency that you don’t hear it and those frequencies is the one you cut out and stop the loop with the rumble filter..)