Bigger the Port the better!!

[classic100%]

The peak at tuning has nothing to do with the port size. It has to do with the system Q.

The box size, tuning frequency, and driver t/s parameters determine the peak vs. frequency response.

Here is a quote from Dan Wiggins (pretty sharp guy when it comes to subwoofer for those of you that don't know):

Qtc > 0.707 will have a bump in the response, loses some accuracy (tightness) and bass extension. The higher the Qtc (0.8, 1.0, 1.3, etc) the less accurate and the less deep bass you get.

Qtc=0.707 is called the Butterworth alignment. It provides the most bass extension you can get without the bump. Good all-around compromise alignment.

0.707 > Qtc > 0.577 is considered overdamped. Better accuracy, a bit less bass extension as compared to the Qtc=0.707 alignment.

Qtc = 0.577 is considered best transient accuracy. It's also known as the Bessel alignment. This alignment has the flattest group delay, which means that signals in the passband go through the speaker at the same speed, so everything stays coherent.

0.577 > Qtc > 0.5 are considered heavily damped. They offer some additional benefits, such as less overshoot and ringing, which can be desireable in higher order systems.

Qtc=0.5 is critically damped. This is the point where you finally reach zero overshoot in the signal. You will have no ringing. Considered "transient perfect", because there is no overshoot, IMHO it's not a significant gain over the Qtc=0.577 situation.

Qtc < 0.5 is considered overdamped. You're not ringing, but you're taking longer to reach the final state of the system. Things get slow down here.

GENERAL NOTES:

The lower the Q, the shallower the "knee" in the response. The slower the transition from flat to rolling off.

The lower the Q, the tighter the sound (to a point).

The higher the Q, the more midbass output, and the higher the peak SPL.

The higher the Q, the boomier the response, and the less accurate the response.

IN GENERAL: responses around 0.7 are considered "ideal" for car use. They are typically considered audiophile grade, with very good accuracy and extension. Higher Qtc values are considered more SPL oriented, lower Qtc values are considered more musically/SQ oriented.

Qtc variances of 5-10% are basically inaudible; you'll be hard-pressed to hear the difference between a Qtc=0.66 box and Qtc = 0.74 box.

Hope this helps!

Dan Wiggins

Adire Audio

Thanks a lot for ur imputed!

[Jonathan Mills]

On 8/13/2013 at 8:47 PM, classic100% said:

Thanks a lot for ur imputed!

Yes thank you for your imputed. Or whatever.. Basically you may wanna think about editing this page of windy nonsense since it has nothing to do with this topic?

[n8ball2013]

2013 bro. 2013