guestlinger
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- Jan 5, 2017
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I recently read a forum post about suppressing resonance from the sound system (apols can’t find link) so thought I’d share my experience.
Firstly I downloaded the free iphone app called “Tone Gen”. I then Bluetooth connected to my A4 B9 B&O Sound System and systematically played all the different frequencies at fairly loud volume one by one through the system. I noted a few frequencies which seemed to cause undesirable resonance within the car. Easily the worst freq was about 230hz which really seemed to hit the natural harmonic freq of central speaker above the dash. And I also noted that if I firmly applied finger pressure to one point on the grill (see pic) then the resonance would significantly reduce. This speaker plays a lot of the mid range vocals and is a critical speaker in the B&O setup and I have historically noted certain songs did indeed generate some resonance of this central speaker. So I unclipped the speaker grill (go careful so as to not snap any lugs - I had no problems but went very slowly and carefully, prising gently with a plastic tool until the lugs starting releasing one by one) and added multiple Velcro strips - see pics. I used both sides of the tape to get a tight grip between car and speaker grill. I then replaced the grill and was thrilled that all the resonance had literally vanished. The system sound had really tightened up and was crisper and much harder hitting. So I’d advise folks to try out the Tone Gen app and if you find an undesired resonance try some simple damping to get a very cheap and fast sound system upgrade
Firstly I downloaded the free iphone app called “Tone Gen”. I then Bluetooth connected to my A4 B9 B&O Sound System and systematically played all the different frequencies at fairly loud volume one by one through the system. I noted a few frequencies which seemed to cause undesirable resonance within the car. Easily the worst freq was about 230hz which really seemed to hit the natural harmonic freq of central speaker above the dash. And I also noted that if I firmly applied finger pressure to one point on the grill (see pic) then the resonance would significantly reduce. This speaker plays a lot of the mid range vocals and is a critical speaker in the B&O setup and I have historically noted certain songs did indeed generate some resonance of this central speaker. So I unclipped the speaker grill (go careful so as to not snap any lugs - I had no problems but went very slowly and carefully, prising gently with a plastic tool until the lugs starting releasing one by one) and added multiple Velcro strips - see pics. I used both sides of the tape to get a tight grip between car and speaker grill. I then replaced the grill and was thrilled that all the resonance had literally vanished. The system sound had really tightened up and was crisper and much harder hitting. So I’d advise folks to try out the Tone Gen app and if you find an undesired resonance try some simple damping to get a very cheap and fast sound system upgrade
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