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Thread: Taiko Tana-LPS-Setchi---listening

  1. #271
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    Thanks for posting those! You read my mind! Very interesting...to be fair, those passive isolation racks from 20hz are quite good and better than i was expecting and 50hz-80hz do quite well. The key is whether the 10hz vibration (where the performance difference is quite great) has an effect on the sound higher up the frequency where you can hear it.
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  2. #272
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    Quote Originally Posted by LL21 View Post
    Thanks for posting those! You read my mind! Very interesting...to be fair, those passive isolation racks from 20hz are quite good and better than i was expecting and 50hz-80hz do quite well. The key is whether the 10hz vibration (where the performance difference is quite great) has an effect on the sound higher up the frequency where you can hear it.
    What’s interesting is that that reducing vibrations at frequencies ( abt 10 Hz) which are below the audible threshold seems to clearly improve the perceived clarity of low frequency bass notes in the audible range ( abt 30 - 50 Hz)

    Reducing 10 Hz vibrations would reduce the amount of phase error in the reproduction of audible low frequencies, so this seems to be a reasonable explanation from the perception of increased clarity of bass reproduction.

    One observation I would like to share is as we have step by step reduced or mitigated sources of low frequency disturbance in our test system, the directionality of the bass seems to very noticeably increase.

    Now we seem to be able hear and localize the bass drum in a size realistic and 3-D manner, instead of a broad cloud or sea of bass which we used to hear/perceive before
    Sound Test, Monaco
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  3. #273
    Senior Member shakti's Avatar
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    if you measure the SPL in your room without any music, you will see, that in most rooms you have around 30 to 35 db (c) noise from the outside.
    This noise (wind, traffic, waves, trains, industrial machines, just the sound of nature and city) is mainly in the sub frequencies 30hz and below.

    A good active base will eliminate/reduce this noise related vibrations, which will help to enjoy the music :-)

  4. #274
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    Quote Originally Posted by shakti View Post
    if you measure the SPL in your room without any music, you will see, that in most rooms you have around 30 to 35 db (c) noise from the outside.
    This noise (wind, traffic, waves, trains, industrial machines, just the sound of nature and city) is mainly in the sub frequencies 30hz and below.

    A good active base will eliminate/reduce this noise related vibrations, which will help to enjoy the music :-)
    When we are playing music we certainly can not hear the airborne side effect of building vibrations, but they do get picked up by the electronics and then they can have a negative effect on the sound.

    Shakti, you make a good point about good active bass speakers systems, these tend to have good phase error measurements. We have been really impressed by the Evolution Acoustics MM series which have excellent phase accuracy at the low frequencies. We are hearing great bass spatial definition from EA MM's when we implement the low frequency vibration reduction measures on source and electronics.

    Here is a plot of the vertical vibrations of a New York City apartment building compared to the vibrations of a house in a rural setting. NYC has building vibrations going up to 150 Hz

    Name:  V compare Park Putnam.jpg
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    Here is a plot of the horizontal vibrations of the same two buildings. The horizontal vibrations of the rural house drop of by 50 Hz, but there is a lot to attenuate in both cases !!

    Name:  H compare Park Putnam.jpg
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    Sound Test, Monaco
    Consultant to Sound Galleries Monaco, and Taiko Audio Holland
    e-mail eurodriversoundtest@gmail.com

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