Hello I am writing to you to see if you can help me, we're riding in a car for spl competition, the car is a VW Polo 6n 3 doors, we have already set the frequency of the car, we've soundproofed, we have prepared everything and car operates at 55Hz,
the material we are using is D7s amplifier, subwoofer xtr 250d2 x 2 units, we made ​​a lot of drawers and port and we can not exceed 149. dbs
we have sought all kinds of information on the internet and have found nothing
I would be very grateful if I help us
thanks and a big hug from Spain
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