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Old 04-19-2010, 11:45 AM   #1
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Slope in bass output

I am full custom now and I now notice when i get above 23 volume my bass output scoops out from something in the factory headunit. I even have the JL cleansweep and the Signal Summing interface.. anybody know how to byspass this headunit problem without the metra and a new headunit! ;-)
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Old 04-19-2010, 12:06 PM   #2
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???? scoops out???
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Old 04-19-2010, 01:06 PM   #3
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this was all I could think about when I read the title of this thread
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Old 04-19-2010, 03:46 PM   #4
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Take it back to the installer if you have a problem. Not sure what you are talking about with "scoop". Also IMO with all that work you did you should have changed out the factory HU you are loosing alot by still using it.
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Old 04-19-2010, 04:02 PM   #5
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Most GM radios have a feature that attenuates the bass as the volume goes up. That is, the radio is designed to remove the bass as the knob is turned up. This is to protect the factory speakers from clipping and to keep them being overdriven mechanically.

The aftermarket stuff is only as good as the signal it receives, and why one of the best single upgrades one can do is the head unit. Even the factory speakers will sound infinitely better with a better source!!

In all honesty, not much you can do Sin, until the factory unit goes byebye. It will always attenuate the bass, so you'll have to tweak your settings and risk overpowering bass down low, or bo aftermarket in dash and have a true auidophile system. Then again, you'll want to go active all the way to achieve near perfect response.
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Old 04-19-2010, 09:42 PM   #6
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Bought the metra and the new Kenwood Excelon DNX9960 :-) Thanks for your help.
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Old 04-19-2010, 10:57 PM   #7
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Quote:
Originally Posted by seddon View Post
Take it back to the installer if you have a problem. Not sure what you are talking about with "scoop". Also IMO with all that work you did you should have changed out the factory HU you are loosing alot by still using it.
Why do you think the Factory radio is such an issue?

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Originally Posted by mrray13 View Post
Most GM radios have a feature that attenuates the bass as the volume goes up. That is, the radio is designed to remove the bass as the knob is turned up. This is to protect the factory speakers from clipping and to keep them being overdriven mechanically.

The aftermarket stuff is only as good as the signal it receives, and why one of the best single upgrades one can do is the head unit. Even the factory speakers will sound infinitely better with a better source!!

In all honesty, not much you can do Sin, until the factory unit goes byebye. It will always attenuate the bass, so you'll have to tweak your settings and risk overpowering bass down low, or bo aftermarket in dash and have a true auidophile system. Then again, you'll want to go active all the way to achieve near perfect response.


We just recently finished up a 2010 w. the BA system. we have no issues with reduction in lowend signal volume.

GM does have a feature known as SCV (speed controlled volume) but this nor anything else in the units reduces volume of the lowend frequencies.

sounds to me like there is an issue elsewhere int he system causing the amp to reduce volume.
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Old 04-19-2010, 11:13 PM   #8
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Quote:
Originally Posted by IAS View Post
Why do you think the Factory radio is such an issue?





We just recently finished up a 2010 w. the BA system. we have no issues with reduction in lowend signal volume.

GM does have a feature known as SCV (speed controlled volume) but this nor anything else in the units reduces volume of the lowend frequencies.

sounds to me like there is an issue elsewhere int he system causing the amp to reduce volume.
With the BA system, I would suspect no reduction in bass response as the volume goes up. It's got a seperate amp/upgraded speakers to handle a little more lowend.

This has nothing to do with the SCV. Most all basic GM headunits in recent model years, have some sort of attenuation built in for bass reduction as the volume knob goes up.

I bet when he gets the aftermarket radio installed, this goes away. Takers?
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Old 04-20-2010, 10:42 AM   #9
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i agree with mrray's theory... i know for sure all chryslers had this but we didnt think the boston acoustics setup would since they have the upgradeable subwoofer that you wouldnt want fading out when volume goes up. Cant wait for the touch screen! hope it fixes the problem.
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Old 04-20-2010, 08:24 PM   #10
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no

Quote:
Originally Posted by IAS View Post
Why do you think the Factory radio is such an issue?





We just recently finished up a 2010 w. the BA system. we have no issues with reduction in lowend signal volume.

GM does have a feature known as SCV (speed controlled volume) but this nor anything else in the units reduces volume of the lowend frequencies.

sounds to me like there is an issue elsewhere int he system causing the amp to reduce volume.
EVEN my 07 Silverado Factory Deck does same thing,,,
Higher volume, lessens the bass ouput..lower it,it returns
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Old 04-20-2010, 10:33 PM   #11
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I know you already solved the problem 2010SIN, but when I get my o-scope I'll look at what happens to the bass output as the volume increases and report back here.
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Old 04-20-2010, 11:19 PM   #12
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cool because there are people out there with subs and no headunit. i cant believe they attenuate so crazy, we're talking a huge drop off when the volume goes way up. I can see them making this a protection device for stock speakers but we figrued the JL pieces would've fixed it.
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Old 04-21-2010, 01:23 PM   #13
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unfortuneately the JL Cleansweep cannot increase volume that has been reduced within the Factory head.
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Old 04-21-2010, 02:48 PM   #14
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Now i've been told that the factory head doesnt do the cut that the actual EQ is built into the factory amp. is this right?
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Old 04-21-2010, 04:46 PM   #15
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HUH

Quote:
Originally Posted by IAS View Post
unfortuneately the JL Cleansweep cannot increase volume that has been reduced within the Factory head.
st before ya said no head units from GM do such a thing..?

"We just recently finished up a 2010 w. the BA system. we have no issues with reduction in lowend signal volume.

GM does have a feature known as SCV (speed controlled volume) but this nor anything else in the units reduces volume of the lowend frequencies.

sounds to me like there is an issue elsewhere int he system causing the amp to reduce volume."
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but its all good



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Old 04-21-2010, 05:55 PM   #16
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Now i've been told that the factory head doesnt do the cut that the actual EQ is built into the factory amp. is this right?
Could be for the BA system. I can't believe the upgraded system would still do this, but I guess anything is possible, lol.
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Old 04-21-2010, 06:02 PM   #17
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..what's the scoop?
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Old 04-21-2010, 09:37 PM   #18
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Quote:
Originally Posted by Alfieboy View Post
st before ya said no head units from GM do such a thing..?

"We just recently finished up a 2010 w. the BA system. we have no issues with reduction in lowend signal volume.

GM does have a feature known as SCV (speed controlled volume) but this nor anything else in the units reduces volume of the lowend frequencies.

sounds to me like there is an issue elsewhere int he system causing the amp to reduce volume."
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I did not say "no head units do such a thing" I stated that the system we had just finished up did not have this issue. I am still not convinced that they do this, but It is very possible that they do. We have a couple calls into some people we know with GM to find out the story. will try to get an answer ASAP.

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Could be for the BA system. I can't believe the upgraded system would still do this, but I guess anything is possible, lol.
If he has the BA system this could be the issue as I was told that leaving the Factory amp in causes lots of problems. We removed the factory amp, but we do have an issue we have found, when you turn the car off there is a bit of a delay and then a loud turn off pop... working on the resolution for this.
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Old 04-22-2010, 11:09 AM   #19
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Quote:
Originally Posted by IAS View Post
I did not say "no head units do such a thing" I stated that the system we had just finished up did not have this issue. I am still not convinced that they do this, but It is very possible that they do. We have a couple calls into some people we know with GM to find out the story. will try to get an answer ASAP.



If he has the BA system this could be the issue as I was told that leaving the Factory amp in causes lots of problems. We removed the factory amp, but we do have an issue we have found, when you turn the car off there is a bit of a delay and then a loud turn off pop... working on the resolution for this.


Oh, the attenuation is there, I guarantee it, lol.

That turn off pop I've expereinced before with a Monsoon system. Even had the subs diesel on turn off when trying to intergrate into a factory, upgraded system. Typical found it to be either LOC problems, or horrible grounds. If it was the LOC, had to tweak the gains to almost off, then compensate on the amp. Still not a great setup, a CleanSweep or 3Sixty would have been better. Of course, gutting the whole car and replacing everything would have been premium, lol!!
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Old 04-22-2010, 08:15 PM   #20
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we are not using a LOC we are using a Zapco SLB-TP4 symbilink interface, slodered ends to the low-level wires from the head and in. I triple checked the grounds... will have to go back over my interface set-up.
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Old 04-23-2010, 10:09 AM   #21
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Have zero experience with the Zapco. I know you know what you are doing, so I'll wager you'll find it.

Talked with James, installer I used to work with, he seconded the gains.

A thought just hit me. Don't know if it applies. But on a couple of systems with a poorly grounded head unit, we would ground the RCAs. Don't remember doing it on a factory head unit, just a few Pioneers and cheaper brands. If nothing else works, might try that. It definitely can't hurt.
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Old 04-23-2010, 01:13 PM   #22
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true... have not thought of having to do that in ages.
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Old 04-23-2010, 11:09 PM   #23
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I had the loud popping also, I just did a little messing with the gains on the 3sixty and tuned it out .
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Old 04-24-2010, 05:41 PM   #24
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Got my o-scope in the mail today hopefully I'll get some time to test the bass output this week. Today I was listening to my stereo at about 30 and I did notice the bass wasn't increasing at the same level with the mids and highs but that could just be a result of poor factory speakers not keep up in the low end.
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Old 04-24-2010, 10:22 PM   #25
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Take it back to the installer if you have a problem. Not sure what you are talking about with "scoop". Also IMO with all that work you did you should have changed out the factory HU you are loosing alot by still using it.
That is not true at all, you can use a Bit one, line driver, Cleansweep, and get everything that an aftermarket radio will do and even more. Bit one has a 36 band eq no aftermarket in dash has a 36 band eq on it.
line drivers, bitone give you up to 10v of out put which no after market radio does,

Plus have you looked at the metra kit it looks like ass, I hate how the buttons look in the car and how the feel, seems like something out of the 90s.
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