Hey guys i had problems with my Sub, It wasint hitting hard at all ,so i was messing around with some settings and turned the Sens up and it started pounding, so Now Iam wondering what it does. thanks

 

Prolly stands for imput sensitivity, AKA that GAIN **** I was telling you about in the other post. It's supposed to be used to match the output signal of the head unit to your amp, some try to use it as just a volume **** and eventually blow speakers.

 

Well, can you explain how to match it up with the headunit, and also my buddy said he wouldint reccomend putting it up more than half way.

 

The easiest, but not necessarily the most accurate way, is to turn the gain all the way down, set the volume of your head unit to about 3/4 max, then slowly turn the gain up while listening to a track that you are familiar with [use a somewhat bass heavy song]. As you turn the gain up slowly, listen for any distortion, sub popping sounds, etc. . . and then turn the gain down just so the sub sounds normal again.

If that's not good enough for you check out JL audio's tutorial site for a way to do it with a multi-meter.

dh

 

yeah, I'm assuming t99 SE-L doesn't have an oscilloscope handy, the above would prolly be fine. I like the same thing with a 1Khz tone (with speakers that will play 1K well of course). Makes clipping real obvious. But I'd just do the above and be careful. SHould be fine.

 

x2 use a DMM and a 50hz test tone recorded at-3db

 

i used the dmm method to set my gains to power my front speakers. this is taken from soundsolutionsaudio.com

"Most audio equipment dies for one simple reason. Most people push their equipment beyond its limits. Whether it is the amplifier, subwoofer or full range speakers, clipping is the number one cause of failure. To prevent clipping, use this tutorial.

To figure out what voltage you should set the gains to, multiply the RMS power of the amplifiers output by the impedance of the speaker, then find the square root of that number. If you are using an amplifier that has an RMS rating of more than your speaker(s) can handle/rated for, then use the RMS rating of the speaker (instead of the RMS of the amplifier) to determine the voltage to set your amp to. This is also referred to as gaining down.

Gain Setting Equation
Voltage of the output = sqrt(RMS Power X impedance of the speaker)
Example
Say the amp provides 100WRMS into a 4 ohm speaker:

Voltage = sqrt(100W X 4 ohms)
Voltage = sqrt(400W*ohms)
Voltage = 20V

Again, that was only an example, use the ratings of your amp to figure that out.
Setting the Gain(s)
To set the gain(s), you need two things:
1. A DMM (digital multi-meter) that is capable of measuring AC voltage (needs to be able to measure up to a range of 200V).
2. A test tone CD to use to set the gains at the correct setting.
Now, to set the gain(s):
1. Start the vehicle, and pop the test tone CD in the head unit.
2. DO NOT hook up the sub(s) or speaker(s) to the amplifier while doing this, just leave the outputs unused at this time.
3. Now, time to set up the head unit.
a. If the loudest you listen to your music at on a regular basis is 22/35 with bass @ +3 and treble @ 0 with MX (or any other sound processor) on, use those settings. NEVER turn the headunit above 3/4 of the maximum volume.
b. Remember to have the car turned on.
c. If you want to use bass boost on a sub amp, set it prior to setting the gains on the amp and use the center frequency of the bass boost (45 Hz for most amps) as your test tone.
d. Please remember that if you have a subwoofer volume control on the headunit and/or a bass **** for the amplifier, set it to the maximum before you set the gains on the sub amp.
4. Take the leads from the DMM and but them on the outputs from the amp.
5. Set the gain so that the outputs of the amplifier equal the voltage you found above. This is a MUST.
Here is JL Audio tutorial on their site:
http://www.jlaudio.com/tutorials/Inp...nsitivity.html

Here is where you can download some test tones for system testing/gain setting:
http://www.ronelmm.com/tones/
http://www.eminent-tech.com/music/multimediatest.html

For test tones higher than 80Hz, download this program and you can create your own:
Adobe Audition Trial Version

It is best to use 50 Hz tone for a sub amp (unless you have bass boost, use the frequency that is boosted as the tone), and a 1kHz tone for a full-range amp.

This is a good way to set the gains, but if you have access to an oscilloscope, by all means use it. Then you can set the gains to their absolute maximum as you can see when the amplifier clips.

If you are wondering what exactly clipping is, and what it looks like, read this:
http://www.bcae1.com/2ltlpwr.htm

If you have any questions about this, post up, I’ll try my best to answer them.

Also, remember a sub can only handle what it can, if you set the amp to its RMS you have to remember that the sub can handle only so much. It is box dependant, but it is best if you are not experienced to follow the manufacturers recommendations."

 

Thanks alot guys i will do this tommrow, but now its hitting pretty hard and clean with the sens half way