Will these speakers fit in my 2008 double cab

they sound OK with out it i need to order the back seat ones soon

 

I know this is old but I finally found what I was looking for. This was posted on another website by one of the manufacturers with probably more SQ wins in competition than any other.

This is a very complex subject that require very in depth analysis for proper understanding so I will just give some basic outlines of the factors at work.

Oval cone shapes offers up many unique attributes most of which are helpful to smooth frequency response and low distortion. The fundamentals and basics that apply to round speakers still apply and as always a speaker is the sum of it parts.

A speakers cone in a perfect world would have infinite stiffness, and the fundamental cone resonance would be an octave or more above it highest useful frequency.

Now back to the world as we know it with those pesky laws of physics. Cone shape and material both have attributes that apply to the stiffness and resonance of the cone body. A stiff material tends to store energy and release it causing a resonance, also a geometrically stiff object will store energy and release it, although geometric stiffness is significantly damped when compared to material resonance which makes it much preferred over material stiffness.

The two most significant modes affecting FR through the pass band of a speaker are edge ring back and primary cone resonance. I am over simplifying for sake of explanation. Primary cone resonance sees the edge of the cone operating 180 degrees out of phase of the neck of the cone causing a very large dip in the frequency response. Edge ring back is the sound traveling through the cone material from the Voice Coil to the edge of the cone and ringing back to the Voice Coil. This causes a very significant null in the frequency response. Both of these mode will normally happen at different frequencies and almost always are easily identified in a simple on axis frequency response plot.

Now lets draw some conclusions based upon my simplified explanation of modes in a speaker that effect frequency response Well if you look at the primary cone resonance with a round cone the diameter is equal for 360 degrees allowing this primary resonance to develop with great strength where in a oval shaped cone the diameter is constantly varying so the primary mode will have nowhere near as much strength. Next up is the edge ring back again in a round cone the distance is equal for 360 degrees causing the null in the FR to be very strong, in the oval cone the the distance is not equal except at 2 points spaced at 180 degree intervals so the resulting effect to the FR will be much lower if almost unmeasurable.

I know that what I wrote is not complete but it points out some of the high points.

As for stresses caused by unbalance, this doesn't follow common logic if you think things through in a mechanical analysis. A round cone is not geometrically stiffer than a oval cone, however a round egg would be stiffer than an oval egg but then they aren't cones they are eggs. Cone stiffness geometrically comes usually from depth and most of the cheap ovals out there are designed for shallow OEM drop in applications meaning a shallow cone which will not be geometrically stiff. Hence my statement in the beginning that "The fundamentals and basics that apply to round speakers still apply and as always a speaker is the sum of it parts"

There have been many variations of trying to improve on the norm of round, star shaped and offset voice coils being just a couple of examples.