[j.f.leonard]

Originally Posted by ctuna

More like 180 for the under seats low passed and 180 or above for the doors high passed . You want the under seats to carry as much midrange and midbass as they can. And you want the doors to go as low as they can. You can play with that number a little bit till you find something you like. Doors may be a little higher but high passed. Mine are 180 for under seats low passed and 200 for the doors high passed.

Okay awesome, exactly what I was looking for. What about "input sensitivity"?

[ctuna]

Start out low, like 0 . With 4 ohm speakers I would say the the doors may be
close to zero and the floors somewhere around almost halfway .
Start with zero and turn them up slowly if you hear noise or distortion
it's to much. The floors should be able to take some gain no matter if
there 2 or 4 ohm if there 2 it will be less.

[j.f.leonard]

Originally Posted by ctuna

Start out low, like 0 . With 4 ohm speakers I would say the the doors may be
close to zero and the floors somewhere around almost halfway .
Start with zero and turn them up slowly if you hear noise or distortion
it's to much. The floors should be able to take some gain no matter if
there 2 or 4 ohm if there 2 it will be less.

The new speakers are 2 ohm and the stock under seats are 4 i believe. Anyway ill try that, thanks!

[j.f.leonard]

Real quick, I was gonna ask if tuning my amp for the under seat subs will effect my 2 12s? To get a source for RCAs for my sub amp I used a line out converter and spliced into the sub wires from the stock harness. If I tune the nee JL amp for the under seat subs, will my 2 12s get the same limiting as the under seats? Also, if something does happen with that, is there a way i could just run an RCA from my JL amp to my sub amp?

[ctuna]

If you are tapping the Radio outs and not the speaker outs
for your sub no . If you are tapping the speaker outs of
the new amp then it will effect it .
Always you the Low level outputs from your radio to feed
your amps is a basic rule for car stereo .
The idea is to get the under seats to pick up some of the mid
range and mid bass.

Avoid using Speaker outs if you can .
This makes a much cleaner setup .
Most amps will accept low level signals.
Pre amp signals .

Also with a new amp the speaker level outs will be at a much
higher voltage.


subwoofer threads
http://www.e90post.com/forums/showpo...2&postcount=66
http://www.e90post.com/forums/showth...t=Ultimate+Sub
http://www.e90post.com/forums/showth...ight=subwoofer

[j.f.leonard]

Originally Posted by ctuna

If you are tapping the Radio outs and not the speaker outs
for your sub no . If you are tapping the speaker outs of
the new amp then it will effect it .
Always you the Low level outputs from your radio to feed
your amps is a basic rule for car stereo .
The idea is to get the under seats to pick up some of the mid
range and mid bass.

Avoid using Speaker outs if you can .
This makes a much cleaner setup .
Most amps will accept low level signals.
Pre amp signals .

Also with a new amp the speaker level outs will be at a much
higher voltage.


subwoofer threads
http://www.e90post.com/forums/showpo...8;postcount=66
http://www.e90post.com/forums/showth...t=Ultimate+Sub
http://www.e90post.com/forums/showth...ight=subwoofer

Okay well I guess ill try it how it is and see what happens as Im doing the install as we speak. If it effects it, could I run rcas from the JL amp to the hifonics amp?

[ctuna]

If you are using RCA connectors for the Input to the amp just
go to the electronics store and buy some y connectors to spit
the input signal to have a set to feed the Sub.
Also It might not make that much difference but its a more
correct solution.
I don't know if that particular amp has a pass through.
I would try to tune the new amp with the subs dissonected
at first.

[j.f.leonard]

Originally Posted by ctuna

If you are using RCA connectors for the Input to the amp just
go to the electronics store and buy some y connectors to spit
the input signal to have a set to feed the Sub.
Also It might not make that much difference but its a more
correct solution.
I don't know if that particular amp has a pass through.
I would try to tune the new amp with the subs dissonected
at first.

So im installing it right now and I looked at my line out converter and its spliced into the sub out wires. So, when i plug the harness into my texhnic harness and then into the JL amp, is there a way i can send rca signal from the JL amp to my sub amp?

[ctuna]

Buy some RCA splitters If you are using RCA inputs.For the Input to the sub amp. Run them off the FR/FL channel and be sure to tape the outside connectors of the RCA's as its a speaker out cable and the shield is and active signal not a ground.

Put tape around the shields of the RCA's going to the amp at the splitter.
Does your sub amp accept low level signals (pre outs)?

You could just leave it the way it is for now probably won't make much
difference you may have to adjust the gain on the sub amp.

[j.f.leonard]

Originally Posted by ctuna

Buy some RCA splitters If you are using RCA inputs.For the Input to the sub amp. Run them off the FR/FL channel and be sure to tape the outside connectors of the RCA's as its a speaker out cable and the shield is and active signal not a ground.

Put tape around the shields of the RCA's going to the amp at the splitter.
Does your sub amp accept low level signals (pre outs)?

You could just leave it the way it is for now probably won't make much
difference you may have to adjust the gain on the sub amp.

Okay so you are saying for now I could try it and see? You said to put the under seat subs low passed at 180 and if thats how its gonna be I dont know if my subs (12s) will even play...

The new JL amp has pre outs and my sub amp has "master out"s

[j.f.leonard]

Well I just plugged everything in including the power/ground wires and everything was good to go so I went to play music and there was absolutely no sound and as soon as I plugged in the technic harness to the car, my sub amp came on.

[j.f.leonard]

Update: My new JL amp is not getting power. The power wire sparks, but the amp "power" light is not coming on and no music is playing. ???

[ctuna]

Do you have a voltmeter?
Do you have a Technic Harness.
Did you run power wires to the Battery with a Fuse.
for the New Amp
What technic calls the power kit.
If you grounded it on the chassis is there 0 resistance
between the negative terminal on the amp and battery
and or 0 volts in-between when powered on.

If the voltage at the battery and amp are not the same you have
resitive connection somewhere. If you attached the ground to a painted
or annodized surface it will not make a good contact.

Most amps have indicator Leds that tell you whats going on.

Check the Voltages at the battery and the amp are they
the same?

The technic harness uses a relay and the old 12 volt power line
is used to switch it . This is done so the turn on signal has enough
juice to switch on multiple amps.

[j.f.leonard]

Originally Posted by ctuna

Do you have a voltmeter?
Do you have a Technic Harness.
Did you run power wires to the Battery with a Fuse.
for the New Amp
What technic calls the power kit.
If you grounded it on the chassis is there 0 resistance
between the negative terminal on the amp and battery
and or 0 volts in-between when powered on.

If the voltage at the battery and amp are not the same you have
resitive connection somewhere. If you attached the ground to a painted
or annodized surface it will not make a good contact.

Most amps have indicator Leds that tell you whats going on.

Check the Voltages at the battery and the amp are they
the same?

The technic harness uses a relay and the old 12 volt power line
is used to switch it . This is done so the turn on signal has enough
juice to switch on multiple amps.

Yes I have a technic 676 harness. The ground was connected where the ground for my sub amp is grounded so all that was good. None of the indicator LEDs came on on the JL amp. I just got a quote for $85 to pull it all out and redo it correctly so I think Ill just do that. Thanks for the help everybody, I know Ive been difficult haha. Ill make an update post once I go to the audio shop. Again, thanks for your time guys

[j.f.leonard]

Alright so I just got back from the shop. It ended up costing me $45, and the problem had something to do with the relay on the technic harness. Anyway, as I expected, my subs are now nowhere close to hitting as low as they were. How can I fix this?

[j.f.leonard]

Could I run an RCA from the preouts on the JL amp to the regular RCA plugs on the sub amp?

If not, could I turn the filter off for the underseat subs since thats what is causing the issue?

[ctuna]

Why don't you take it back to the shop and ask them to
attach the subs such that they run off the Radio outs Inputs
to the amp bypassing and getting rid of the speaker out adapter.
(If possible) and have them readjust the gains and crossovers
to your taste.

Also the thing is now you actually have some mid range and high
end that won't be swamped out by the low end.

[j.f.leonard]

Originally Posted by ctuna

Why don't you take it back to the shop and ask them to
attach the subs such that they run off the Radio outs Inputs
to the amp bypassing and getting rid of the speaker out adapter.
(If possible) and have them readjust the gains and crossovers
to your taste.

Also the thing is now you actually have some mid range and high
end that won't be swamped out by the low end.

Thats true, but my subs dont even sound like subs anymore. I got a response from crutchfield stating that I can use the preouts as rca signals for my sub amp so im just gonna run rcas from there and then re adjust my sub amp as needed, if needed at all.

[j.f.leonard]

I tried using the preouts on the JL amp, and my subs sounded even quieter than before. Any suggestions...?

[j.f.leonard]

I just tried a few different things and noticed that when I only insert the rear RCA into the preouts of the JL amp, the subs seem to hit how they used to. Could I leave it like this..?

[ctuna]

If you don't need the rear outputs of the radio for anything else
it should be OK. Then you can use the Fader to control the balance
between the Subs and the stuff attached to the JL
if I am understanding what you are saying correctly.

If it works and doesn't smoke it should be Ok.

Why don't you run it but the guy that straightened out your wiring.

[j.f.leonard]

Originally Posted by ctuna

If you don't need the rear outputs of the radio for anything else
it should be OK. Then you can use the Fader to control the balance
between the Subs and the stuff attached to the JL
if I am understanding what you are saying correctly.

If it works and doesn't smoke it should be Ok.

Why don't you run it but the guy that straightened out your wiring.

He didnt do anything with my sub wiring and theres no point in driving 20 mins again just to ask so Ill just run the rear rca and see how that goes. I cant imagine it would cause any issues not supplying my sub amp with front speaker signal