Impala Builder

attack and decay get affected also, thus the reproduction of the signal becomes less accurate.
harder to start, and harder to stop.

Just because it plays the note doesn't mean the speaker is accurate.Accuracy in the heavier drivers is harder to achive. Example would be an explosion like a cannon. its a very dynamic sound. does your sub make a clap, or a grown when it plays something that dynamic.........

a BOOM!

or a bbbbbbbBBBBBBBOOOOOMMMMMmmmmmm

[ January 17, 2005, 01:56 PM: Message edited by: Impala Builder ]

SilverGS

That is a lot of excellent info to digest Jamie! Thanks for all the info.

Now I am even more confused! [img]smile.gif[/img] I think I should just settle on a pair of 12's and get this torture over with!

hobbes26

More mass will change the frequency response (greater low end), but not the transient response. This change in frequency response changes the spectral balance you hear.

Acceleration of the moving mass is controlled by the amount of current going through the coil. The change in acceleration is controlled only by the inductance. Since the 'attack' is a change from low current to a sudden high current - this is also only affected by the inductance.

[ January 17, 2005, 03:13 PM: Message edited by: hobbes26 ]

Sassmaster

iTrader: (2)

you're not even considering inertia... a body in motion tends to stay in motion.

also, the laws of thermodynamics, a body moving in a given direction tends to maintain that direction unless sufficiently acted upon by a force (paraphrase)

so the heavier the cone, the harder it is to stop it's motion and reverse it.

That is the arguement they are making, more mass = more energy required to change direction = less transient response.

hobbes26

The change of acceleration with respect to time is transient response and is independent of mass.

Acceleration itself is not the transient response.

[ January 17, 2005, 05:32 PM: Message edited by: hobbes26 ]

Sassmaster

iTrader: (2)

it is absolutely not independant of mass... the entire premise of inertia is that change of accelleration, or change of motion is completely affected by mass.

try changing the accelleration of your car by standing in front of it and tell me if mass has anything to do with it.

Impala Builder

so back to your original q.....now what was it again....LOL

Sassmaster

iTrader: (2)

for your sub, I'd recommend the Image Dynamics IDmax... great IB sub, light cone and suspension.
1000 RMS power handling, but still plays well down at 200 RMS.

hobbes26

Here's a good read on the issue of inductance, mass and transient response: http://www.carsound.com/cgi-bin/UBB_...=022382#000004

Real data to prove it too. Added mass and increased inductance on a real driver and measured the impulse response. Increased mass did not change the impulse response but the higher inductance driver had a slightly delayed response.

[ January 17, 2005, 09:29 PM: Message edited by: hobbes26 ]