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sorry, i cann't input chinese in my computer. for the 220Hz noise, in my opinion, you must know it's PT noise or Road/tire noise. and find out which transfer path is the most important for 220Hz noise. 220 hz noise may be mixed of structure born and air born noise. so if i was you,
i will test the sound outside the car, to see if there is 220Hz noise outside the car, if yes, it may be air born noise, find the source or test the air leakage of the car, if no, it may be the structure born, finding out the transfer path may be very important. |
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