What is A subsonic filter for and what does it do....and what is the phase control for? Its just a 2way switch from 0 to 180. completely lost
Replies (8)
swez on 02/15/2006 09:02:49
The SSF is used in ported enclosures to protect the sub(s) from damaging sonic energy below the "port tuning frequency" (PTF) of the enclosure. At PTF, most of the bass we hear, comes out of the port(s). Below PTF, the sub(s) will "unload" and cones and coils are subject to excess heat and excursion rates. (Bad for a sub)
SSF's are not required when using sealed boxes as the sealed box will roll off lows naturally and the air spring effect helps keep the sub cones from damage as well.
The phase shift feature, helps with alignment between the sub(s) and full range components in the vehicle. Basically, it insures the bass waves are hitting at the same time as the MB/MR drivers. We know we have it right when we get the fullest bass sound in the vehicle. All cones are working in an additive fashion.
When subs are out of phase, they tend to cancel out some of the overlapping frequencies and bass/MB tend to be subtractive, thin and hollow sounding.
Does that help ya out?
Swez
Harvester on 02/15/2006 13:32:42
So if the box is tuned for 40hz then the ssf should be on 40....and the phase switch should be set accordingly with the way it sounds
Harvester on 02/15/2006 13:33:07
and if its a sealed box...neither matter
ttocs on 02/15/2006 15:28:55
Most SSF I have seen are not selectable. It is either on or off. You can use it on a sealed box as well, but it is mainly for ported boxes which are more suseptable to damage from those notes.
As for the phase switch, try it out and see what is better.
Harvester on 02/15/2006 16:28:44
I dont hear a difference on the phase switch
swez on 02/15/2006 16:55:03
Try reading your manual on the phase switch and see what they recommend for setup and operation.
As for the SSF, some amps are only selectable at a fixed frequency. Choos the one that is closest to the PTF used in box. (Typ: 15/30 Hz.) Here, use the 30 Hz., Other amps do offer a variable freq setting range. In that case, set this as close to PTF as possible.
Swez
MrBrownstone on 02/15/2006 18:01:55
Since most speakers at ~20Hz are just 'fartin in the wind' (not able to reproduce sound, you can go ahead and set your SSF to 20 (or even 25Hz) and it'll save you a lot of power consumption.
that, and a lot of heat to the speaker.
Phase, I wouldn't change that from 0 unless you have a really good reason to...like linking up 2 amps to the same speaker...but that's way too advanced for this conversation.
Harvester on 02/15/2006 22:49:10
ample
Replies (8)
swez on 02/15/2006 09:02:49
The SSF is used in ported enclosures to protect the sub(s) from damaging sonic energy below the "port tuning frequency" (PTF) of the enclosure. At PTF, most of the bass we hear, comes out of the port(s). Below PTF, the sub(s) will "unload" and cones and coils are subject to excess heat and excursion rates. (Bad for a sub)
SSF's are not required when using sealed boxes as the sealed box will roll off lows naturally and the air spring effect helps keep the sub cones from damage as well.
The phase shift feature, helps with alignment between the sub(s) and full range components in the vehicle. Basically, it insures the bass waves are hitting at the same time as the MB/MR drivers. We know we have it right when we get the fullest bass sound in the vehicle. All cones are working in an additive fashion.
When subs are out of phase, they tend to cancel out some of the overlapping frequencies and bass/MB tend to be subtractive, thin and hollow sounding.
Does that help ya out?
Swez
Harvester on 02/15/2006 13:32:42
So if the box is tuned for 40hz then the ssf should be on 40....and the phase switch should be set accordingly with the way it sounds
Harvester on 02/15/2006 13:33:07
and if its a sealed box...neither matter
ttocs on 02/15/2006 15:28:55
Most SSF I have seen are not selectable. It is either on or off. You can use it on a sealed box as well, but it is mainly for ported boxes which are more suseptable to damage from those notes.
As for the phase switch, try it out and see what is better.
Harvester on 02/15/2006 16:28:44
I dont hear a difference on the phase switch
swez on 02/15/2006 16:55:03
Try reading your manual on the phase switch and see what they recommend for setup and operation.
As for the SSF, some amps are only selectable at a fixed frequency. Choos the one that is closest to the PTF used in box. (Typ: 15/30 Hz.) Here, use the 30 Hz., Other amps do offer a variable freq setting range. In that case, set this as close to PTF as possible.
Swez
MrBrownstone on 02/15/2006 18:01:55
Since most speakers at ~20Hz are just 'fartin in the wind' (not able to reproduce sound, you can go ahead and set your SSF to 20 (or even 25Hz) and it'll save you a lot of power consumption.
that, and a lot of heat to the speaker.
Phase, I wouldn't change that from 0 unless you have a really good reason to...like linking up 2 amps to the same speaker...but that's way too advanced for this conversation.
Harvester on 02/15/2006 22:49:10
ample
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