Changing the Frequency of a box....?

[Briggiboy33 2]

I bought a x12 and have made the reccomended ported box for it. I def sounds amazing when the windows are down in my truck it gets really low. But its not really as loud as i want and most of my music just dosnt go that low.. The other thing is i have a pair of harrison soundlab external subsonic filters... And a pair of right angle adapters from radioshack.. Could these be lowering the signal to the amp and decreasing my out put? Any help would be great. Iv heard you can fill the box a little to raise the tuning frequency.. Idk the sf are at 30hzbtw

[Briggiboy33 2]

My subwoofer level was on -4... My mistake...

[fearlessgangsta 12]

^ good to hear

[lithium 358]

I bought a x12 and have made the reccomended ported box for it. I def sounds amazing when the windows are down in my truck it gets really low. But its not really as loud as i want and most of my music just dosnt go that low.. The other thing is i have a pair of harrison soundlab external subsonic filters... And a pair of right angle adapters from radioshack.. Could these be lowering the signal to the amp and decreasing my out put? Any help would be great. Iv heard you can fill the box a little to raise the tuning frequency.. Idk the sf are at 30hzbtw

so your amp does not have a sub sonic filter built in? how about your headunit?

if your amp or hu already has the filter then no need for and external filter.

you can either shorten the length of port or decrease the volume of the box to raise tuning IIRC.

you should also try moving the subwoofer enclosure around the trunk and aiming in different directions.

in my car, firing into the trunklid from about 5" away resulted in the loudest/lowest response and firing forward was the worst output. this varies car to car so you may find something different that works for you.

what are your other setting set at? bass boost off? any additional "loudness" setting on?

what is the box specs? tuning and net volume? vehicle?

[CHRIS 323 12]

shorten the length of port

when you make a port smaller that means tuning UP or DOWN ??????????????

[Julian 641]

shorten the length of port

when you make a port smaller that means tuning UP or DOWN ??????????????

I would suggest adding larger and larger 45's in the corners... it is a much easier way to raise tuning and is easily reversible. Simply calculate the area of a square and half it, you will end up with your amount of space taken away then you can calculate how much it raised your tuning.

[lithium 358]

shorten the length of port

when you make a port smaller that means tuning UP or DOWN ??????????????

I would suggest adding larger and larger 45's in the corners... it is a much easier way to raise tuning and is easily reversible. Simply calculate the Volume of a square and half it, you will end up with your amount of space taken away then you can calculate how much it raised your tuning.

FTFY

and shortening the port would raise the tuning.

i like julian's idea since it is easier to add 45s then to shorten a slot port. if it was a pvc port then that would be easier.

[Briggiboy33 2]

Well the box positioning is pretty set in the back left passenger seat of my 06 tundra accesscab. It bangs super hard on "gettin to the money" by gudda gudda.. But thats the only song i really listen to that is that low. And i really only listen to it cuz its so loud in my truck.. I dont know the exact specs of the box but it was the one reccomended for the x12 on the fi forum Page. And no su sonic filters o. The head unit or amp. I have the clarion cx501 and the powerbass asa 400.2. But whats the easiest way to make the box smaller? Everything is glued and painted nice with about 6 coats... So im not taking it apart.... Lmao but if i could do ajything with just access from the sub hole then that would help alot.

[lithium 358]

Well the box positioning is pretty set in the back left passenger seat of my 06 tundra accesscab. It bangs super hard on "gettin to the money" by gudda gudda.. But thats the only song i really listen to that is that low. And i really only listen to it cuz its so loud in my truck.. I dont know the exact specs of the box but it was the one reccomended for the x12 on the fi forum Page. And no su sonic filters o. The head unit or amp. I have the clarion cx501 and the powerbass asa 400.2. But whats the easiest way to make the box smaller? Everything is glued and painted nice with about 6 coats... So im not taking it apart.... Lmao but if i could do ajything with just access from the sub hole then that would help alot.

to decrease the volume you could add 45s to the corners like Julian suggested. i think you could do this thru the sub hole.

if you had spec's for the box you could calculate the effect on tuning. in other words, if i remove X amount of airspace, the tuning frequency will now be XX hertz.

i would also try flipping the phase on the subwoofer. if there is no phase adjustment then just switch the + and - speaker wires at the amp.

[Briggiboy33 2]

What could adjusting the phase do?

[Dangrebel 89]

I used expanding foam that I sprayed in a cardboard box with a trash bag inside of it, let it cure, then glue to the inside of the box somewhere to not disrupt port air flow.

[Julian 641]

I used expanding foam that I sprayed in a cardboard box with a trash bag inside of it, let it cure, then glue to the inside of the box somewhere to not disrupt port air flow.

The 45 is the cheapest and easiest way to do it.

[lithium 358]

What could adjusting the phase do?

likely nothing but worth messing with a bit.

if you had strong midbass upfront then thats another story.

google destructive interference