hiss noise kenwood kvt 717 hu

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westlos213

Member - Posts: 10

Joined: May 27, 2007

Location: United States

Posted: May 27, 2007 at 11:08 PM / IP Logged

first of all thank you for readign this, here is my system

kenwood kvt-717 ,infinity 7541a 4 ch amp, kenwood kgc-4042a eq,hifonics mono amp, 12'' l5, 4 door speakers infinity kappa 6872.cf vehicle:2005 ford expedition

the last thing i added to this setup was the kenwood eq, it made the system sound a hell of alot better BUT! i also got alot of HISS noise coming in, now i re-routed all the wires(power,ground)etc... away from each other and no luck =( now i have read that kenwood and pioneer units have a history of this type of stuff, has any one succeeded in minimizing this or getting ridof it completely? i have set the gains on the infinity amp to barely even on and it still there not as loud as it is when i turn the gains up, the thing is that when i defeat the eq the hiss is barely noticeabe but my system sounds nothing like it does when the eq is on the last thing i have tried to look at was the ground for the hu,eq amp and i noticed that the ground for the hu ends up at the harness and is not grounded to metal , now i knwo there is a sticky for grounds but i have 22 pages to read before i figure out if i can solve this so please bare with me, thanks for reading this and hopefully you can help me out.....

btw, IF it ends up being that the hu is the culprit, anybody know fo a hu similar to mine in features and quality i can look at?..

audioman2007

Copper - Posts: 580

Joined: February 20, 2007

Location: United States

Posted: May 28, 2007 at 11:38 AM / IP Logged

Ok make sure you have your power and ground wires running back the driver side of the car and have your RCA's running back the passenger side. This will eliminate any possible ground loop engine whine that can jump from the power/ground to the RCA's. Also make sure you have a good solid ground. Hissing or "whine" sound are commonly caused by a bad ground. Also, your EQ might be grounded poorly, but your EQ could also just be amplifing your hissing sound. First off, does your hissing sound change when you rev the engine?

westlos213

Member - Posts: 10

Joined: May 27, 2007

Location: United States

Posted: June 05, 2007 at 12:03 AM / IP Logged

no, the hissing does not change when i rev the engine, i do not get any ''whine'' just ''hissing'', what type of wire do i use if i were to ground the hu/eq to bare metal? what gauge?....

haemphyst

Platinum - Posts: 5,054

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: June 05, 2007 at 9:59 AM / IP Logged

Power has nothing to do with it... Stop chasing that cat. You have already discovered the issue, and you just don't realize it. It's the EQ, and there is nothing you can do about it, without replacing the EQ with one of better quality. (And even that might not completely fix the issue, as the noise could ALSO be coming from the deck... Kenwood decks aren't famous for their specifications, IMO) The EQ gain stages are amplifying (and equalizing) noise that the deck is already producing, while at the same time, adding it's own... It's going to happen no matter WHAT device you put in line.

If you are not experiencing any kind of alternator noise, then it is obvious that the installation is fine, and the hiss you are hearing is the poor signal to noise (S/N) ratio of the EQ. Short of opening the EQ, and replacing all of the (obviously) VERY cheap op-amps within it, you are stuck with it.

Let this be a lesson to everybody reading this: ANY additional gain stage, (even a UNITY GAIN STAGE) whether EQ, line-driver, (speakermakers, are you reading this?) crossover, whatever... And no matter HOW MUCH YOU PAY FOR IT, it will always, always, ALWAYS add some noise and distortion. Some components are better than others, (westlos213 actually got one that WASN'T better than others) but it is an absolute guarantee that there will be additional destruction of the signal, no matter how minute.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

westlos213

Member - Posts: 10

Joined: May 27, 2007

Location: United States

Posted: June 05, 2007 at 5:49 PM / IP Logged

haemphyst,

thanks for the info my friend told me the exact same thing today after he heard my system he also had the same problem, with the exact same model eq.....he removed his....any recommendations on eq's ? not too expensive ...are all kenwood eq's this problematic? so the higher the s/n the better or what specs will i look at when considering a eq?, thanks again

speakermakers

Copper - Posts: 231

Joined: January 02, 2003

Location: United States

Posted: June 10, 2007 at 2:30 AM / IP Logged

Are you kidding me? I haven’t even commented on this thread and haemphyst is calling me out? Adding a line driver or an item with a line driver in it early in the signal chain (next to the head unit) will reduce the noise floor between that unit and the next in the chain. I don’t believe that I have ever stated otherwise. I think that haemphyst needs to loosen the strap on his helmet.

If you add 1 db to the noise floor between the head unit and the EQ and reduce the noise floor by 10 db between the EQ and the amp you end up with a 9 db reduction. I might just be dumb but I am not. Oh yea and I am right!

hiss noise kenwood kvt 717 hu -- posted image.

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hiss noise kenwood kvt 717 hu

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