LC2i keeps failing on me.

[THE TECH]

Originally Posted by aresh

when i had all 4 wires plugged in, my sub would never hit hard and they would almost always blow or my amp would over heat. The reasoning i have, your getting signal, a low pass signal from the two subs underneath, just one signal from one sub would give you a clear signal rather than having two signal pushed into one sub. the way i have mine setup is, pick any sub you want signal from and cut the other sub out. EX. right l7 subwoofer, right postive and right negative will go into your lci.

If you're only using one channel of the LC2i then you could only have one output on the RCA side of it right? Are you using a y-cable so the you can use both channels of amp?

[BIGW0RM]

Originally Posted by aresh

Also with all 4 wires in, i could not run the LCi more than minimum, once i cut of the other L7 sub signal, i was able to set the gain of the LCi perfectly.

Interesting!

Originally Posted by aresh

can you run you LCi any higher than half way without it distorting? When i had mine plugged in that way, the unit wasn't able to go any higher than minimum or 9 o clock position without distortion.

SAME HERE. 1/2 way on the lc2 gain and it would distort and that warning light would light up. I have mine at 10am and seems to work (when it worked).

Originally Posted by kmarei

no
i can't run the lc2i any higher, or it distorts
but i have no need to
i have plenty of volume when its set to 9o'clock

Same here. 9to 10 o clock is more than enough.

[Technic]

Originally Posted by aresh

when i had all 4 wires plugged in, my sub would never hit hard and they would almost always blow or my amp would over heat. The reasoning i have, your getting signal, a low pass signal from the two subs underneath, just one signal from one sub would give you a clear signal rather than having two signal pushed into one sub. the way i have mine setup is, pick any sub you want signal from and cut the other sub out. EX. right l7 subwoofer, right postive and right negative will go into your lci.

Originally Posted by aresh

Also with all 4 wires in, i could not run the LCi more than minimum, once i cut of the other L7 sub signal, i was able to set the gain of the LCi perfectly.

There's something else going on in your particular setup... for the Logic7 system I use a 80W peak passive LOC with both OEM amp woofer outputs wired to it. No issues after more than 200 Logic7 harness kits sold in the last 2 years.

The LC2i should handle the Logic7 outputs without any sweat.

So let's go back to the particular problem at hand of 2 different EPS systems causing the exact same LC2i malfunctions all of a sudden.

[kmarei]

Originally Posted by THE TECH

Unfortunately, this seems counterproductive. I can understand maybe keeping the Bass at zero or not adding additional, but to have to keep the EQ flat in order to keep things happy seems to be giving up one thing to have another.

well i'm not giving up anything
i have it set that way because that's what sounds best
if i raise the 100hz (which is the lowest)
the mids start to distort if i raise the volume
same if i raise the bass

this way i have the sub handle the bass
and the mids sound good when i raise the volume

[BIGW0RM]

Originally Posted by Technic

There's something else going on in your particular setup... for the Logic7 system I use a 80W peak passive LOC with both OEM amp woofer outputs wired to it. No issues after more than 200 Logic7 harness kits sold in the last 2 years.

The LC2i should handle the Logic7 outputs without any sweat.

So let's go back to the particular problem at hand of 2 different EPS systems causing the exact same LC2i malfunctions all of a sudden.

Bummer... I was hoping that might have been a fix for us.

[Technic]

If the bass adjustment in the iDrive is set to relatively high levels then the LC2i levels need to be set to complement those levels -high in the iDrive, low in the LC2i.

If both levels are high then clipping will be induced. The LC2i is also a line driver capable of up to 13V output.

The AccuBass feature does not help to set the LC2i accordingly with the EPS system. However as long as it is disabled then it should not interfere with the LC2i Bass adjustment. The LC2i Bass adjustment should simply increase the level of voltage coming from the OEM woofer outputs in a linear fashion depending on how much you turn the Bass knob/gain.

AccuBass increases the bass output dynamically (supposedly filling out the bass "holes" in the music), which it is not good if you also are increasing the bass adjustments at the iDrive.

[Technic]

Originally Posted by ILSMKU

Bummer... I was hoping that might have been a fix for us.

You can always try one channel, but in my opinion this will be masking the real problem.

I will be getting a pair of custom Navone 30V passive LOC for you and Tech each to try sometime late this week. I want to know what happens when the active LOC is replaced with a passive (no line driver, no Accubass) in your particular amps.

[THE TECH]

Originally Posted by Technic

I will be getting a pair of custom Navone 30V passive LOC for you and Tech each to try sometime late this week. I want to know what happens when the active LOC is replaced with a passive (no line driver, no Accubass) in your particular amps.

Awesome. That sounds promising.

[aresh]

Sorry i used L7 because i dont know what else to call the subs underneath the seats, I have the individual like most M3 owners, Well idk why i had the issue but it lasted for 2 years and i had changed several amps and subs and LOCs, nothing would work until i tried using the signal from only one sub and it never had any issue after that, my system hit harder than ever and never have any amp overheating, or subs blowing or LOC going out. Guys give it a shot, im no genius at this and Technic knows alot more than i do, but this worked for me!

PS: I had two subs running in parallel i believe. Also with the adjustment i provided, the LC6i i used would be able to go at least half way or more without distortion.

[Technic]

Originally Posted by THE TECH

Awesome. That sounds promising.

Please PM your mailing addresses...

[aresh]

Originally Posted by Technic

There's something else going on in your particular setup... for the Logic7 system I use a 80W peak passive LOC with both OEM amp woofer outputs wired to it. No issues after more than 200 Logic7 harness kits sold in the last 2 years.

The LC2i should handle the Logic7 outputs without any sweat.

So let's go back to the particular problem at hand of 2 different EPS systems causing the exact same LC2i malfunctions all of a sudden.

Sorry for the confusion, i figured the L7 midwoofers were also used in individual system? Anyhow i have the dirac system. Im also using LC6i

[THE TECH]

Originally Posted by Technic

Please PM your mailing addresses...

Sent!

[THE TECH]

Originally Posted by aresh

Sorry for the confusion, i figured the L7 midwoofers were also used in individual system? Anyhow i have the dirac system. Im also using LC6i

We are using the LC2i so not sure if any of your info even crosses over.

[aresh]

Same unit basically, only more channels

[THE TECH]

Originally Posted by aresh

Same unit basically, only more channels

Are you sure there are no differences in voltage input capabilities?

[kaigoss69]

Originally Posted by THE TECH

Unfortunately, this seems counterproductive. I can understand maybe keeping the Bass at zero or not adding additional, but to have to keep the EQ flat in order to keep things happy seems to be giving up one thing to have another.

The problem described here surely has to do with the input signal to the LC2i becoming too high, which results in either a) the LC2i failing and/or b) the LC2i output signal becoming distorted. Both are bad, for the LC2i, and for your subs. What you want to do is to set up every device in the signal path to NOT produce distortion at the maximum desired volume levels.

I have never been a fan of head unit bass boost, as it is an easy way of introducing distortion into the signal path. If you want to "boost" bass, always do it at the amp, because it has the most available "headroom". As far as the EQ goes, not adding any boost in the bass range is actually not counterproductive. Especially in your case, where the LC2i seems to be close to maxed out, adding additional voltage into the LOC through boost or EQ is to be avoided. You can still EQ, but you do it by cutting, and not boosting. For example, if you want to boost the 80Hz range, you can cut the surrounding frequencies and then increase the gain on the amp accordingly.

[Technic]

Originally Posted by aresh

Sorry i used L7 because i dont know what else to call the subs underneath the seats, I have the individual like most M3 owners, Well idk why i had the issue but it lasted for 2 years and i had changed several amps and subs and LOCs, nothing would work until i tried using the signal from only one sub and it never had any issue after that, my system hit harder than ever and never have any amp overheating, or subs blowing or LOC going out. Guys give it a shot, im no genius at this and Technic knows alot more than i do, but this worked for me!

PS: I had two subs running in parallel i believe. Also with the adjustment i provided, the LC6i i used would be able to go at least half way or more without distortion.

Were you using the LC2i or the LC6i?

[kmarei]

Ok i took some pics
here is my amp gain
I marked the minimum and maximum and the current level in red


and here is the LC2i gain, also highlighted the current settings in red

[THE TECH]

Originally Posted by kmarei

Ok i took some pics
here is my amp gain
I marked the minimum and maximum and the current level in red


and here is the LC2i gain, also highlighted the current settings in red

Wow. Wish I could use settings that low.

[kmarei]

Originally Posted by THE TECH

Wow. Wish I could use settings that low.

I have a spare lc6i I was using then realized it had too many channels for my needs, and replaced it with the lc2i
Want to try it?

[aresh]

Originally Posted by kmarei

Ok i took some pics
here is my amp gain
I marked the minimum and maximum and the current level in red


and here is the LC2i gain, also highlighted the current settings in red

i would use some sort of slope for refined bass and lose the infrasonic unless your aiming for mids, just my 2 cents

[THE TECH]

Originally Posted by kmarei

I have a spare lc6i I was using then realized it had too many channels for my needs, and replaced it with the lc2i
Want to try it?

I have a brand new, third LC2i sitting that I can use. I was just wondering if the LC6i was of any higher quality and/or could handle more input voltage over the LC2i.