with a port tuned to 24hz. how important is a sub sonic filter?
i know that most music has minimal if any content below 20hz, but im sure films have heavy bass information all the way down to 0hz
i have also seen many many vented speakers without them....
i know that most music has minimal if any content below 20hz, but im sure films have heavy bass information all the way down to 0hz
i have also seen many many vented speakers without them....
Mostly sub-sonic filters are used with vinyl (records), though I suppose it could be possible to filter it out for some other reason. If you're good down to 24 Hz though, I couldn't imagine you'd have much of a problem.
Several factors come into play.
What is the response of your amp? Do you have a subsonic filter on your preamp you can use instead? What is the mechanical X-max of your speakers? Finally, what are you willing to spend?Low frequency filter elements in a passive crossover can be quite large, and costly.
Several factors come into play.
What is the response of your amp? Do you have a subsonic filter on your preamp you can use instead? What is the mechanical X-max of your speakers? Finally, what are you willing to spend?Low frequency filter elements in a passive crossover can be quite large, and costly.
If below 24 Hz is a problem then don't play Mendelssohn organ works by Peter Hurford on the Rieger Organ at Ratzeburg Cathedral on Argo. There is a lot of loud material down to 17 Hz.
G²
If you play a lot of vinyl, especially older/used vinyl, a subsonic filter can help prevent your woofers from seeing an early grave (this is based on personal experience!). For two reasons:
* a lot of vinyl can look quite flat or the warps you do see don't seem all that bad, but whatever the reason (some kind of resonance reaction between a certain type of warp and the cartridge's own specific mechanical properties?), I've seen woofer cones move so far in & out I thought they were going to tear the surround, despite the seemingly mild appearance of a warp.
* low-frequency feedback can be really nasty too. This can happen even at moderate levels e.g. background music at a social occasion, and depending on the type of music and location of the table vs. speakers, the woofers can unexpectantly begin pulsating wildly, making you think the cones will launch themselves right out of their baskets.
BTW if someone has their system sitting on a suspended wooden floor or they live on the 2nd, 3rd etc floor of a building, sometimes just walking across the floor near the turntable can cause the tonearm to react, and a subsonic filter can sometimes prevent problems here too.
Lastly, even if the warp/feedback doesn't damage a speaker, the amp is now being asked to supply power for reproducing that extremely low frequency signal, diverting power away from the music signal - not good.
* a lot of vinyl can look quite flat or the warps you do see don't seem all that bad, but whatever the reason (some kind of resonance reaction between a certain type of warp and the cartridge's own specific mechanical properties?), I've seen woofer cones move so far in & out I thought they were going to tear the surround, despite the seemingly mild appearance of a warp.
* low-frequency feedback can be really nasty too. This can happen even at moderate levels e.g. background music at a social occasion, and depending on the type of music and location of the table vs. speakers, the woofers can unexpectantly begin pulsating wildly, making you think the cones will launch themselves right out of their baskets.
BTW if someone has their system sitting on a suspended wooden floor or they live on the 2nd, 3rd etc floor of a building, sometimes just walking across the floor near the turntable can cause the tonearm to react, and a subsonic filter can sometimes prevent problems here too.
Lastly, even if the warp/feedback doesn't damage a speaker, the amp is now being asked to supply power for reproducing that extremely low frequency signal, diverting power away from the music signal - not good.
Certain subwoofer designs really need to have high pass filters as well, like TQWT.
As a general rule, it probably wouldn't hurt to filter out what your speakers can't / shouldn't be producing anyway. Not only does it waste amplifier current, it can be damaging for drivers.
I've seen woofers that almost jumped out of the coil gap during the playback of a record, simply from a light "thump thump thump" of someone walking across the room.
As a general rule, it probably wouldn't hurt to filter out what your speakers can't / shouldn't be producing anyway. Not only does it waste amplifier current, it can be damaging for drivers.
I've seen woofers that almost jumped out of the coil gap during the playback of a record, simply from a light "thump thump thump" of someone walking across the room.
Pipe organ subsonic
I have been a pipe organ fan all my life and subsonic noise are common in recording pipe organs, especially when like in my case, using a large subwoofer, you hear it all.
I have a subsonic filter on my amp and if all subsonic filters are suppose to work like that, then I would not invest in one,
You can try and reduce or EQ down from 30hz and below, so it is not that that noticeable.
What really works well for me is to edit the CD on Sound forge and take out the subsonic noise in the areas that are most noticeable, like on the softer parts in the music. That has worked very well for me, keeping the bass and the extremely low 32ft stops and all it's sound on the loud parts and reducing bass if any on the softer parts.
Only a few record companies do that for you, especially on organ works, MotetteSACD-MOT-13254 Transcription from Cologne, that CD has it all done and can easily be seen on Sound Forge.
Pipe organs are difficult to record, without any subsonic frequencies,especially the old ones .
I have been a pipe organ fan all my life and subsonic noise are common in recording pipe organs, especially when like in my case, using a large subwoofer, you hear it all.
I have a subsonic filter on my amp and if all subsonic filters are suppose to work like that, then I would not invest in one,
You can try and reduce or EQ down from 30hz and below, so it is not that that noticeable.
What really works well for me is to edit the CD on Sound forge and take out the subsonic noise in the areas that are most noticeable, like on the softer parts in the music. That has worked very well for me, keeping the bass and the extremely low 32ft stops and all it's sound on the loud parts and reducing bass if any on the softer parts.
Only a few record companies do that for you, especially on organ works, MotetteSACD-MOT-13254 Transcription from Cologne, that CD has it all done and can easily be seen on Sound Forge.
Pipe organs are difficult to record, without any subsonic frequencies,especially the old ones .
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