JL Audio Amps

[no1buster]

ARC, MTX, Kicker all suffered from the same "clipping" issues related to a few bad runs. IMHO, and thats purely me, believe that they are pound for pound worth the money. I 've been running setups like this in DB drags for a few years without issues.

Magnet size does matter when considering Q and effeciency of the box setups. Read this:
Q Q is the formula for what happens electrically and physically at resonant frequency. Q is related to how slowly a natural vibration dies down. Q is a neat term that combines many elements of speaker design, so it's an important term to speaker designers.
Q is important to the woofer because in a speaker system where the Q is too high, you'll get a whomp in the bass. If a speaker system's Q is too low, then the bass output is relatively weak, because frequency response is highly damped in that region.
The best Q for a speaker to have is one that gives flat response down to the resonant frequency.
If you do nothing to a speaker but make the cabinet smaller, you increase stiffness and therefore Q goes up. But Q is not a word for stiffness alone. It's a ration involving mass, stiffness, and resistance (or damping). Designers often juggle these three factors. Good bass is not enough. Good bass with uniform frequency response and spherical wave-form is the goal. Obtaining that goal without too much sacrifice in efficiency is the challenge.
EFFICIENCY AND MAGNETIC FORCE
In a dynamic speaker, the voice coil and the magnet structure interact to force the speaker to move. Send an electric current through a coil in or near a magnet and a force is produced. The force results in an alternating movement or motion which is converted to variations in air pressure by a cone. The pressure is radiated as a sound wave.
The stronger the magnetic field, the higher the force, the higher the efficiency. Bigger magnets often lead to stronger magnetic fields, but not always, because the strength is related, not only to magnet size, but also to the size and shape of the gap that the voice coil moves in.To get a more efficient speaker of the same size, you can use a stronger magnetic field. However, this gives you lower Q. You'll get more output at the middle frequencies, but less at the high and low ends. This can give relatively less bass even though you now have higher efficiency. Therefore, if you increase magnetic field, you have to go back and redesign the tuned port of the cabinet to get back to correct response.


you can go to directed acousitcs for more info on this at http://www.directacoustics.com

[ghaitma]

help!!!!
I have a 2004 X5 with standard radio no nav. After reading the "How to add a subwoofer amp to the X5 factory audio", I decided to add a JL audio
250/1 amp and a 10w3v2d4 sub to boost the low bass. I follow the setup procedure from JL audo: configure the sub coils in parallel to achieve 2ohms and adjust the amp to 22.4 volt ac. After doing all that, I can not hear any difference. When I play with the input sensitivity, I have huge bass but the sound is awful. Can somebody tell me what I am doing wrong?

[el_duderino]

Originally Posted by ghaitma

Can somebody tell me what I am doing wrong?

Yes, you are spam-posting. Stop posting the same question all over the place