i dont like my sound on vented design subwoofer(definitivetech 15tl+) lately,it gets kindof boomy so i was thinking of sealing its port completely(to get tighter bass),would it be a bad idea?or any other suggestions?
Are you saying that lately you do not like the boominess that the sub produces or that the sub has gotten boomy lately. I have owned this sub in the past and I never thought that it was boomy. The location of the sub in the room will have more impact on the sound quality than plugging the port. Keep it a minimum of 6" to 8" from the walls and do not place it in a corner. You may also need to tune it. What volume is the sub on? How high do you have the sub volume turned up on your receiver?
Sometimes those higher bass freq.can be heard(and i'm not much into it). reciever is set at 0db.,subwoofer is at one-third,through LFE. I think my reciever's x-over is set too high(can't adjust it,nor turn it off)). I'm gonna move it further away from wall and see what it'll do.