No treble in rear speakers !?!?

[NY-KiD 10+ year member]

I just got four new mb quart coaxials (DKH 116). Have them hooked up to an infiniti amp, pioneer avic N2 head unit. Here's the problem..the front speakers work perfect - good volume, high treble. The rear the speakers on the other hand lack volume and barely have any treble comming out of them. Its definately not a speaker problem because I hooked up the front speakers RCA to the input of the rear speakers on the amp and they sounded good. Its not a rca problem either because i tried changing the rca cable for the rear channel on the head unit and no luck. Its has definately something to do with the head unit's rear channel rca output. Anyway for me to troubleshoot this? Thanks in advance for your replies.

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[ahole-ic]

When you hook the rear channel rcas up to the front channel, do you get clean sound? If you get the same problem then, it is your HU. If you don't, you have your crossover on your amp on the rear channel set to low pass. Set it to flat or high pass and you'll be fine. If it's your HU it's the same deal you'll just have to find the option in your HU to turn low pass off.

 

[t1990le 10+ year member]

When you hook the rear channel rcas up to the front channel, do you get clean sound? If you get the same problem then, it is your HU. If you don't, you have your crossover on your amp on the rear channel set to low pass. Set it to flat or high pass and you'll be fine. If it's your HU it's the same deal you'll just have to find the option in your HU to turn low pass off.

^This^ check the LPF

 

[NY-KiD 10+ year member]

Im sorry I forgot to mention I already checked the crossovers on the amp, both rear channel and front channel are set to HP and the same input level. When I connect rear channel rcas to front channel it has the same problem - low input, no treble. But its def not the cable. Is there anyway to fix this problem or I just have to replace the head unit? and it this a common problem?

 

[ahole-ic]

It's just a setting in your HU. You just have to find it.

 

[Chris Z 10+ year member]

My guess is that you have the rear rcas plugged into the "subwoofer output" or something very similar to that - where there's a lpf on that set of rcas built in to the hu.

 

[NY-KiD 10+ year member]

Nope its not the subwoofer output. I connected the subwoofer rca to my speaker amp just to make sure and you get no sound cuz its for subwoofer. What setting in HU could it be? I mean I checked the fade levels, eq settings, etc. but theres no seperate options for rear channel and front channel. All the settings in there apply to both channels. I'm guessing it might be because the pico fuse or whatever its called is blown because I get a slight whine noise in the speakers (pioneers hu's have a fuse, if its blown typically because of hot swapping rcas which i did, you hear whine noise). I have no idea how that would affect the rear channel output though.

 

[ahole-ic]

Nope its not the subwoofer output. I connected the subwoofer rca to my speaker amp just to make sure and you get no sound cuz its for subwoofer. What setting in HU could it be? I mean I checked the fade levels, eq settings, etc. but theres no seperate options for rear channel and front channel. All the settings in there apply to both channels. I'm guessing it might be because the pico fuse or whatever its called is blown because I get a slight whine noise in the speakers (pioneers hu's have a fuse, if its blown typically because of hot swapping rcas which i did, you hear whine noise). I have no idea how that would affect the rear channel output though.

Well, I guess you could try grounding your HU chassis to the vehicle chassis. I highly doubt this will help your rear channel. You've proven though, that it is either a problem with your HU or your RCA's since the trouble moves with that pair. I don't think it's the pico fuse. If you refuse to change rcas or find some option in your HU to manipulate that sound then you have two options. You can lose your fade and just pass the front channel through to the rear channel and do your fading with the gain knobs OR you can throw that HU away and get a new one.

 

[NY-KiD 10+ year member]

I actually tried using rca output on the speakers infiniti amp and connect it to the rear channel rca input, and the treble improved a little but still its very low compared to front channel. I'm going to try splitting the front rca and maybe itll be a little better, but I know everytime you split you loose signal and quality. Is there any signal boosters for rca perhaps?

Edit: what if i just use the white lead from front channel rca for front input and the red lead for rear channel input? Im guessing that will only give mono instead of stereo but as long as it feeds good signal for all speakers its worth it. Please correct me if I'm wrong. thanks

 

[ahole-ic]

I actually tried using rca output on the speakers infiniti amp and connect it to the rear channel rca input, and the treble improved a little but still its very low compared to front channel. I'm going to try splitting the front rca and maybe itll be a little better, but I know everytime you split you loose signal and quality. Is there any signal boosters for rca perhaps?
Edit: what if i just use the white lead from front channel rca for front input and the red lead for rear channel input? Im guessing that will only give mono instead of stereo but as long as it feeds good signal for all speakers its worth it. Please correct me if I'm wrong. thanks

So let me get this straight. You would rather have the left channel for the front and the right channel for the back and not have balance OR fade rather than just not have fade? You're splitting the signal either way. You WILL NOT be able to tell the difference. Don't do it the way you just said. That is asinine.

 

[NY-KiD 10+ year member]

So let me get this straight. You would rather have the left channel for the front and the right channel for the back and not have balance OR fade rather than just not have fade? You're splitting the signal either way. You WILL NOT be able to tell the difference. Don't do it the way you just said. That is asinine.

oh wow i didnt think about that lol. Just to clarify when you said "pass front channel to rear channel"...is that the same thing that i have done already? (take output from amp and connect it to rear channel input)

 

[ahole-ic]

oh wow i didnt think about that lol. Just to clarify when you said "pass front channel to rear channel"...is that the same thing that i have done already? (take output from amp and connect it to rear channel input)

I don't know exactly what you did there. It sounds dangerous but maybe we are talking about the same thing and just don't know it. I am not referring to a speaker output. I am referring only to rca connections. Most amps today have a pass through option. Some also have a selectable switch to pass the signal from the front to the rear. You also listed something you could do which was use y adapters. The object is to take your signal coming from your head unit and get it to the front and rear input rca jacks. What amp are you running?

 

[Toxic_Acoustiks 10+ year member]

My guess is that you have the rear rcas plugged into the "subwoofer output" or something very similar to that - where there's a lpf on that set of rcas built in to the hu.

x2

pull out the manual, also look into the HPF/LPF settings on the deck maybe

 

[NY-KiD 10+ year member]

Yes im only talking about rca connections. Amp is infinity 475a 4 channel

Infinity - Car Audio

 

[I Like Waffle]

Pioneer HUs have a setting that turns the rear speaker output into SW outputs, turn the unit off and hold the source button to access the menu. Theres a setting that says (rear sp. : full range or rear sp : s/w) Needs to be set as full range