ok i dont know what im doing wrong or what..i went by the sticky....i have an JLaudio 5001/v2 amp and jlaudio 10w7 ...
sub is 3ohm and amp specs say 500rms from 1.5ohm to 4ohm...
500
x 3
------
1500 and square root is 38.73
I disconnected the speaker wire and put that cd in it said to...if hooked up pos. and neg. i get 0.00...
if i touch the ground to the ground coming in to amp and pos. to speaker out put i get 87.7
also I cant figure out which to turn it adjust gain
AMP:
Rated Power: 500 W RMS @ 1.5 ohm - 4 ohm (11V-14.5V)
THD at Rated Power: <0.05% @ 4 ohm
S/N Ratio: >95dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Frequency Response: 5 Hz - 500 Hz (+0, -1dB)
Damping Factor: >500 @ 4 ohm / 50 Hz
>250 @ 2 ohm / 50 Hz
Input Range: Switchable from 200mV-2V RMS to 800mV-8V RMS
Dimensions (L x W x H): 13.40 in. x 9.25 in. x 2.36 in.
340 mm x 235 mm x 60 mm
SUB:
Free Air Resonance (Fs): 30.6 Hz
Electrical “Q” (Qes): 0.578
Mechanical “Q” (Qms): 7.647
Total Speaker “Q” (Qts): 0.537
Equivalent Compliance (Vas): 1.28 cu. ft. / 36.1 liters
One-Way, Linear Excursion (Xmax)*: 0.9 in. / 23 mm
Reference Efficiency (no): 0.171%
Efficiency (1W/1m)**: 84.3 dB SPL
Effective Piston Area (Sd): 59.8 sq. in. / 0.0386 sq. m.
DC Resistance (Re): 2.75 ohm
Nominal Impedance (Znom): 3 ohm
Thermal Power Handling (Pt): 500W
Driver Displacement: 0.09 cu. ft. / 2.5 liters
Net Weight: 30 lbs. / 13.6 kg
Elmer the wricer hunter..."Shhh be vewy vewy quiet...I'm huntin wrice"
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I don't know what the problem is or what you're trying to do.
2002 Cavalier 2200 5spd
Solid Snake wrote:I don't know what the problem is or what you're trying to do.
I'm trying to tune my amp
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tune it till it sounds good. i may be a newb but thats the best way for me to tune my amps. just play with the dials till the sound gets good.
idk aboot anything JL but IIRC input sensitivity is another term for gain
I agree with ^^ since the gain matches the output to your input (hence is input sensitivity) So my first guess would be to adjust that one. And you don't want your multi to touch anything going into the amp, that's not what you're tuning. With the multimeter aside, hook up your subs again and turn on the hu with the cd, if it's making sound from the subs, then unhook the subs and bring in the multimeter. Hook the one side of the multimeter to where you had the sub hooked up and then hook the other wire on the multimeter to where you had the wire for the other sub. Then switch it for either DC or AC voltage and you should get a number (60v-20v) is the range you're probably going to see. Then all you gotta do is turn that sensitivity dial until the number on the multimeter matches the voltage you need to be sending the subs.
Robert Freeman wrote:I agree with ^^ since the gain matches the output to your input (hence is input sensitivity) So my first guess would be to adjust that one. And you don't want your multi to touch anything going into the amp, that's not what you're tuning. With the multimeter aside, hook up your subs again and turn on the hu with the cd, if it's making sound from the subs, then unhook the subs and bring in the multimeter. Hook the one side of the multimeter to where you had the sub hooked up and then hook the other wire on the multimeter to where you had the wire for the other sub. Then switch it for either DC or AC voltage and you should get a number (60v-20v) is the range you're probably going to see. Then all you gotta do is turn that sensitivity dial until the number on the multimeter matches the voltage you need to be sending the subs.
im about to give up...I unhooked the sub again..which hits very hard...but i unhooked it..i tried all diffrent combo with the multi meter and i get 0.00...very strange...i have the digital multi meter on 200ac volts which is the lowest setting. making sure it is reading right..i checked voltage dc out of cap..14.7...so the meter is working...i dont understand
Elmer the wricer hunter..."Shhh be vewy vewy quiet...I'm huntin wrice"
Kill da wriiiicer...Kill da Wricerrrrr..kill daaa wriccceeerr!!!
Voltage tuning is a waste of time unless you drive an anechoic chamber.
What matters in the end is what hits your ears, doesn't it?
First of all, your speakers (probably) have different efficiencies. If your fronts are 93dB and your subs are 89dB, you're not going anywhere without solving a logarithmic equation.
Second, your fronts and your subs are facing different directions, pass through different materials and are different distances away from your ears.
Third, your subs box can greatly affect output. One box can be 3 or more times louder than another at certain frequencies, at the same voltage.
Fourth, each car has its own unique transfer function that boosts low frequencies.
Don't bother with the multimeter. What you need is a dB meter and a test CD full of sine waves. First flatten out your bass response. Play a tones from 20-80hz in 10hz increments while using your EQ to flatten the response. Then play higher frequencies and integrate your fronts with the subs.
2002 Cavalier 2200 5spd
my end product was hopeing that when i raise the volume of the radio it all raises equally...i love that my sub hits hard as @#ck but i was wanting to have it hit that hard at my full volume that i listen too...ive adjust everything i know to..i have NO bass boost or anything on and its at full blast half way up and doesnt go any louder 1/2 to full...only my 4 fronts do...
Elmer the wricer hunter..."Shhh be vewy vewy quiet...I'm huntin wrice"
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maybe what will help better is if you just get another amp to push the other speakers. that might solve your problems
Then you must raise your amp's gain and/or your head unit's signal.
2002 Cavalier 2200 5spd
see i used to have this same problem. did you turn your bass down from the head unit.
i have an alpine amp pushing the fronts..and the jl amp pushing the sub...i can figure out how to adjust the alpine amp...just cant figure out the jl amp...yes my bass is all the way down on the radio...ill take a pic of my set up today and show you were im at..keep in mind its a project in progress so it doesnt look all pretty yet~LOL~
Elmer the wricer hunter..."Shhh be vewy vewy quiet...I'm huntin wrice"
Kill da wriiiicer...Kill da Wricerrrrr..kill daaa wriccceeerr!!!
nevermind...problem solved...my dumb azz for got to turn the remote hooked up to the amp down...now its around 38..so i figured it out...why would the bass boost make it go from 34-38...all the way to i checked with everything going around 90?
Elmer the wricer hunter..."Shhh be vewy vewy quiet...I'm huntin wrice"
Kill da wriiiicer...Kill da Wricerrrrr..kill daaa wriccceeerr!!!
Setting gains with a DMM:
- Get a dummy load representing the speaker impedance. You will need to use power resistors capable of dissipating the amount of power you're expecting from the amp.
- Depending on your DMM you will probably need a 60Hz 0dB signal as this MIGHT be the only frequency it will recognize for AC voltage.
- Connect the dummy load to your amp as if it were your speaker and play the 60Hz signal.
- Read the AC voltage across the resistor.
- The power coming from the amp is equal to voltage^2/resistance.
Although you appear to have already solved your problem I hope this helps you in the future or someone else.
Not everyone has easy access to one but a scope would be much better to use as you can verify there is no clipping
Sir Tipsy
Solid Snake wrote:Voltage tuning is a waste of time unless you drive an anechoic chamber.
What matters in the end is what hits your ears, doesn't it?
First of all, your speakers (probably) have different efficiencies. If your fronts are 93dB and your subs are 89dB, you're not going anywhere without solving a logarithmic equation.
Second, your fronts and your subs are facing different directions, pass through different materials and are different distances away from your ears.
Third, your subs box can greatly affect output. One box can be 3 or more times louder than another at certain frequencies, at the same voltage.
Fourth, each car has its own unique transfer function that boosts low frequencies.
Don't bother with the multimeter. What you need is a dB meter and a test CD full of sine waves. First flatten out your bass response. Play a tones from 20-80hz in 10hz increments while using your EQ to flatten the response. Then play higher frequencies and integrate your fronts with the subs.
Sure if you dont mind doing damage to your speakers/subs....
Voltage tuning is not a waste of time, its the proper way to do it
