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Quarter Wave / T-Line tutorial-UPDATED


Forevrbumpn

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area is measured in square inches, not cubic feet.

MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..."

Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through.

Hammerdown... 1%

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so do you just change the fs in the equation if you want to tune it differently?

yeah..and in turn it changes the overall length.

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I think theyre pretty neat. When the water runs down your crack as you let one out... its like shitting in a crockpot.
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Hello guys. I am new around here as a member but i was watching this forum for a while.

Can someone help me with a t-line box project for 4 12's? I have 4 spl dynamics v300d4 woofers.

I would prefer a 33 - 35 hz tune.

Here are some parameters for the woofers.

Nominal impedance 2x4 ohm

Voice coils connection series 8 ohm:

Fs 30.7 hz

Vas 65.4L

Qts 0.553

Qes 0.616

Qms 5.456

Xmax lin/peak 10/20 mm

Re 6.4 ohm

Mms 146 g

Bl 18.18 Tm

Spl 1w/m 87.6 db

For parallel voice coils connection 2 ohm:

Fs 30.9 hz

Vas 67.2 L

Qts 0.595

Qes 0.664

Qms 5.676

Xmax lin/peak 11/20 mm

Re 1.6 ohm

Mms 146 g

BL 8.586 Tm

Spl 87.6 db 1w/m

If you have any suggestions of how to connect them together and what kind of box should i use... i'm looking forward. I want to use them as daily driving but also in spl. i have enough space in the car because i quit off the back seats. Thank you.

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Nobody wants to help me? :( I can't understand how to calculate exactly the length and how to place the 4 subs in single box. If i have 4 12" subs the port area has to be the sd of 1 sub multiplied by 4?

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