No vocals coming thru on Amp?

[jhebert]

Re: No vocals coming thru on Amp?

Any suggestion on a fix, if that is the case?

I gave you the suggested cause: a channel is inverted in phase. The remedy, if that is the actual cause, is to correct the phase inversion.

 

[roughshot]

Re: No vocals coming thru on Amp?

I gave you the suggested cause: a channel is inverted in phase. The remedy, if that is the actual cause, is to correct the phase inversion.

How would I go about doing that?

Thanks

 

[bruceb58]

Re: No vocals coming thru on Amp?

How would I go about doing that?

Thanks

Look at my post #14.

 

[roughshot]

Re: No vocals coming thru on Amp?

Look at my post #14.

Thanks, the speakers are hooked up that way currently.

 

[edu01jose]

Re: No vocals coming thru on Amp?

Do you have another mp3 device you could test? If you are using a cell phone to play music than that may be your problem.

 

[Jerryh3]

Re: No vocals coming thru on Amp?

I gave you the suggested cause: a channel is inverted in phase. The remedy, if that is the actual cause, is to correct the phase inversion.

Are you thinknig it's destructive interference? That usually doesn't happen just with the highs.

 

[roughshot]

Re: No vocals coming thru on Amp?

Do you have another mp3 device you could test? If you are using a cell phone to play music than that may be your problem.

I have used my phone a BB Storm2, my wifes phone a DroidX and our Ipod. Both phones produced music without vocals and the Ipod gave no sound at all.

 

[edu01jose]

Re: No vocals coming thru on Amp?

Pretty strage, just saying, the 3.5mm plugs doesn't enter all the way in into my phone.

 

[bruceb58]

Re: No vocals coming thru on Amp?

I actually doubt its a phase issue. That usually reduces the amount of bass you would hear but shouldn't affect mid range where vocals reside.

 

[jhebert]

Re: No vocals coming thru on Amp?

To test if there is a phase inversion of one channel of the stereophonic reproduction system, play a recording that is a two-channel monaural recording. If there is a phase inversion in one channel there should be almost complete cancellation upon playback through your system. This simple test will help determine in a few seconds if the problem you are observing is due to a phase reversal in one channel of your stereophonic system.

It is very common for cheap audio gear to have phase problems due to poor quality control. All it takes is for a pair of wires to get crossed.

 

[hrdwrkingacguy]

Re: No vocals coming thru on Amp?

I was reading in the manual for that amp that there is a high and low level input level dial...Do you have the level matched right? also have you tried a different RCA style source instead of the ipod and the 3.5mm to 4 rca cable adapter you are using...Find something that has RCA outs(like an old headunit, or get a 3.5mm to RCA single channel wire from bestbuy) and plug it directly into the amp...if the problem goes away its the wire...

 

[jhebert]

Re: No vocals coming thru on Amp?

It would be quite an amazing property for wire to be able to conduct the music between the recorded playback device and the loudspeaker amplifier but somehow not conduct the vocals. Could you explain the principle on which the wire would possess the ability to discriminate between which electrical signal it should conduct and which electrical signal it should not conduct based the the musicality of the signal?

 

[hrdwrkingacguy]

Re: No vocals coming thru on Amp?

It's real simple...It's called process of elimination...If you have a known good source and you plug it into your amp with known good wiring and it still does the same thing(and its true that there aren't any crossover switches, or crossovers in the speaker wires) then your amp is bad...I have my droid x plugged into my Alpine CD player in my truck with a 3.5mm to RCA and its old...when you bump it hard or twist the wire or pull a little while its playing, all kind of weird things happen...

It would be quite an amazing property for wire to be able to conduct the music between the recorded playback device and the loudspeaker amplifier but somehow not conduct the vocals. Could you explain the principle on which the wire would possess the ability to discriminate between which electrical signal it should conduct and which electrical signal it should not conduct based the the musicality of the signal?

BTW people are making things way to complicated...The only "principal" that's involved, "Is the hardware good, or bad" knowing what I know about car/marine audio installation I personally think you have a bad amp, and I was trying to show a way to prove it...

 

[jhebert]

Re: No vocals coming thru on Amp?

The only "[principle]" that's involved, "Is the hardware good, or bad" ...

I don't believe you have demonstrated how copper wire would know how to delete the vocals from a recording but preserve the accompanying music. I do not believe that copper wire possesses that ability.

 

[Jerryh3]

Re: No vocals coming thru on Amp?

I don't believe you have demonstrated how copper wire would know how to delete the vocals from a recording but preserve the accompanying music. I do not believe that copper wire possesses that ability.

It wouldn't be from the wire. It would be destructive interference of the sound waves from two channels being out of phase of each other. It happens more with lower frequencies so that's why I highly doubt it's a phase problem. Most likely a bad amp.

 

[hrdwrkingacguy]

Re: No vocals coming thru on Amp?

...Most likely a bad amp.

Kinda the conclusion I was trying to help the OP reach...There is waaaaay to much douchebaggery in this thread...So I will say good luck to the OP...

 

[jhebert]

Re: No vocals coming thru on Amp?

[The loss of vocals] would be destructive interference of the sound waves from two channels being out of phase of each other.

I said that in post #5 in this thread. We are 36 posts into this thread and you are saying the same thing I said in post #5.

 

[Jerryh3]

Re: No vocals coming thru on Amp?

I said that in post #5 in this thread. We are 36 posts into this thread and you are saying the same thing I said in post #5.

Um, ok.

 

[WebsterCityIowan]

Re: No vocals coming thru on Amp?

It's real simple...It's called process of elimination...If you have a known good source and you plug it into your amp with known good wiring and it still does the same thing(and its true that there aren't any crossover switches, or crossovers in the speaker wires) then your amp is bad...I have my droid x plugged into my Alpine CD player in my truck with a 3.5mm to RCA and its old...when you bump it hard or twist the wire or pull a little while its playing, all kind of weird things happen...

Well said friend.
I have a brand new Kenwood head unit in my truck and I also use a 3.5mm to play direct from my mp3 player. I got the 3.5mm cord with my Sirius radio and just used it for my mp3....blah blah blah. Here's my point; the 3.5mm cord got cut so I went to Radio Shack to buy a new one. There were ones that costed 15 dollars and ones that costed 3 dollars. I figured I'd save a few bucks and just get the cheap one. Well, the NEW 3.5mm cord doesn't work properly. The sounds are extremely distorted and unrecognizable. I'm no genius but I think certain cords only have the capability to handle certain-"bits"-of sound.

Hope this helps buddy!

 

[ac0j]

Re: No vocals coming thru on Amp?

I am wondering why the 3.5mm jack to rca has 4 rca jacks on it. A 3.5mm stereo jack only is two channels of audio and a common. NOT 4. It may be a cable designed for video and audio. Look at the 3.5mm jack on the cord, does it have three shiney spots and two black bands? If not, you have the wrong cord! Are the rca ends of the adapter cord color coded? if so what colors?