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Necessity of subsonic filter

 

alone_foreever
Unregistered guest
mtx 801d doesn't have subsonic filter. but it has compression circuit to eliminate clipping. this amp used to power subs in ported or bandpass, will it blow them (cuz not having subsonic filter)? if yes,where this filter should be placed?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6889
Registered: Dec-03
you need the filter for a ported box, yes.
otherwise when the amp sends frequencies to the subs below that of the tuned port frequency, the subs lose their suspension (the resistance supplied by air pressure inside the box) and they can over-extend, and that causes the subs to get fried.

www.partsexpress.com has an FMOD 20Hz high pass filter (RCA) you can connect to the amp at the RCA lines for about $25.
that's all ya need
 

New member
Username: Metalgearsolid

NJ

Post Number: 5
Registered: Dec-04
"when the amp sends frequencies to the subs below that of the tuned port frequency......" lets say i have a box tuned 40 hz. isn't FMOD 20 20 Hz still sending freq to sub lower than tuned port?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 6917
Registered: Dec-03
yes, and if the box is tuned to 40Hz, you'd want a filter set at about 30Hz, which is one-half octave down.
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