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Reload Thread: Port tuning on a 18" DC Level 4XL

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    Z from Japan's Avatar
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    Port tuning on a 18" DC Level 4XL

    I am looking for suggestions on port tuning (recommended Hz) for a 18" DC Level 4XL D2 pushed by a US Amps Merlin MD2D 1500W@1ohm.
    This will be going in the back of my family van and I have about 6-7cubes (maybe 8cu if I am willing to give up more trunk space) to work with.

    This will never be metered. I just want to rock on out to some old school Techmaster PEB, Bass Mechanic, etc. FWIW, I like the lows

    What is a good frequency to shoot for to make this sound good?



    Here are the subs specs:
    Mounting Depth 9.25"
    Mounting Hole Diameter 16.75"
    Motor Width 8.75"
    Weight 56.5lbs
    VC Diameter 3" Flat 8 layer
    Magnet Weight 50lbs
    Power Handling RMS/Peak 1500/3000
    Impedance D 1 or 2ohm
    Sd 1159.00 cm²
    Fs 31.86Hz
    Qms 7.25
    Qes 0.33
    Qts 0.31
    Xmax 26mm
    Sensitivity 94.77
    Suggested Sealed N/A
    Suggested Ported 5.0³-8.0³ ft







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    Marlo Stanfield's Avatar
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    Re: Port tuning on a 18" DC Level 4XL

    32hz would make a pretty nasty daily setup, with like 7ft3 and 100 or so sq in of port.



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    Re: Port tuning on a 18" DC Level 4XL

    I have a DC Level 4 18 tuned to 32hz, it def likes the lows, but sounds good on everything. The upper end suprised me too.

    30hz would be a little better on the lows, and 6.5 cubic feet net would be a nice size for that sub.



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    Re: Port tuning on a 18" DC Level 4XL

    Quote Originally Posted by tez4life View Post
    I have a DC Level 4 18 tuned to 32hz, it def likes the lows, but sounds good on everything. The upper end suprised me too.

    30hz would be a little better on the lows, and 6.5 cubic feet net would be a nice size for that sub.

    ^^Thats very encouraging to hear. It means a lot and I am looking forward to seeing what this can do.



    Just two hypothetical boxes, the outter dimensions would be similar:
    one is 5cuft tuned for 28hz,
    and the other is 7.5 tuned for 32hz.

    How much different would they sound?
    I realize that the bigger box would be more efficient (louder) off lower power, but the one tuned for lower hz might have a smoother and deeper roll off.

    Anyone have any suggestions on these two boxes?




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    Marlo Stanfield's Avatar
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    Re: Port tuning on a 18" DC Level 4XL

    If you had to choose between the 2 then without question go w/ the 7.5ft3 @ 32hz setup. The other box is just all wrong in more than one way.



    No body talks to me direct... You deal with Snoop and Chris first.

    1998 Ford Explorer Eddie Bauer
    Pioneer AVIC-N2
    2 Orion HCCA 15.4
    AB VFL 400.1
    8ft3 @ 33hz w/ 6" aeros

    150.6 @ 40hz 149.8 streetbeat 148.0 bassrace

    Quote Originally Posted by snoopdan View Post
    you're right, most girls are up to date on the newest rockford line.

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    Re: Port tuning on a 18" DC Level 4XL

    Quote Originally Posted by Marlo Stanfield View Post
    If you had to choose between the 2 then without question go w/ the 7.5ft3 @ 32hz setup. The other box is just all wrong in more than one way.

    Def agree with you on that, however, my box was 5.5ft3 at 32hz and sounded great. I considered a larger box to dig those lows a little better however. Even with the low tuning, the sub would honestly benifit from a larger enclosure esp on the lows.



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    Re: Port tuning on a 18" DC Level 4XL

    28hz, hit them lows and kill your car




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