Absolute Musical Gems.
THE BEST IS YET TO COME!!

Some people are just never happy with doing good things,, they just have to have things that are good.. This is my latest creative handiwork and I recon it is going to be a winner.

Designed for outrageous SPL without losing site of SQ,, this box is RUDE..

Just when things had gone quiet,  I go and come out with this.
The deal so far, 2 JL 15W3-D4's, nuff power and an estimated 156dB,, ummM!!

Basically a 5 Chamber Triple Reflex Design which has internal chambers that behave like a Transmission Line speaker. There is a centre square adjustable port that will satisfy most SPL bandits.

This is a big box so it is reserved for big cars or small vans but it is worth losing the space for.. Adequate power supply is a most.

The graph above also shows how the box will peak @ 46.83Hz will push 140.4dB with 3200wrms. When an AMG in-car prediction calculation of *1.1131 is added at a 12dB of TF then a figure of 156.27dB is calculated for the output. THIS IS JUST A PREDICTION.

*1.1131 is a calculation based on an in-car response of a typical car whereby a transfer function of just 12db at 70Hz is accounted for. It also assumes the use of an Audio Control RTA meter being used in a non outlaw event.

SQ hasn't lost the plot either, as we can see from the graph below.

This graph is similar to the phase response graph except that it expresses the lag of the output audio signal as a delay in milliseconds. The group delay is derived from the slope of the phase response. Ideally, there should be no delay from one frequency to the next. This would result in a flat plot line. In general, the group delay increases as the frequency decreases. A gradual change in the group delay is not very audible. However, sudden large changes in group delay are audible and should be avoided.

These graphs help to give an idea of the transient response, for really deep low bass a group delay that is high will achieve this result especially for hard dance music lovers, this produces a slow and low bass note, it is not designed for sonic purity, but it will rumble everything it touches. Very typical of a Bandpass box in 6th order configuration.

A short group delay time is better for sonic purity and high SPL lovers, this often means that Bandpass boxes are not going to be suitable for a certain applications. 

A total group delay time of under 15.0ms is what to aim for if you want good clean solid bass [from the peak or at  30.0Hz to 100Hz]. Or under 5ms for real pure tight punchy reproduction, though this can be often the result of an over-dampened enclosure.. At the very least we want this delay to be below 5ms @ 100Hz or better.

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Last revised: November 14, 2002 .