Hi i went to a shop yesterday to install a DSP (with built in amp) + active sub

After installing / tuning i notice there is noise coming out from all speakers (even with the HU off). whenever i start the car there will be noise.

This has become really annoying. I brought the car back to the shop just 2 hours after installing, they say they cant do anything other than reducing the master volume to a minimum (then there is no point to upgrade audio in the first place).

The explanation given by them is, the amplifier amplified the stock amp current (kenwood stock amp) so they cant do anything.

Tried to get a return+refund (with a loss of course) but they havent bothered to reply me.

Any sifu can suggest any solution to this?

is the wiring works ok?
did you monitor on how they did it?
maybe can ground your car properly...it might helps
u got add grounding cables?

hi bro, i've been through the same route.

1) Does the noise increase with ur rpm?
If yes, most probably the signal lines are too close to the power cables. u can try isolating it.

In my previous car, i ran the power cables and rca on opposite sides and it solved the issue.

no. with 0 rpm there is still sound. i notice the boss of audio shop try to rev the engine but didnt notice any difference.

its very annoying as i can hear the sound through the background of any music i play (worst when the HU is off)

how much damage to ur wallet?

2.5k

ouchh..... maybe u can visit other shop for them to diagnose?

are you around pj area?

if yes, we can meet up and let me check if u dun mind.

u mention about kenwood stock amp. does ur system looks like this:
hu > kenwood stock amp > dsp (built in amp) > speaker
better hve it like this: HU > dsp > (kenwood amp optional) > speaker.
if the kenwood amp is non removable (integrated with the HU) try reducing the gain to minimum. only use the dsp built in amp

This post has been edited by finalazy84: Jul 13 2020, 03:45 PM

I'm back at the shop now they are trying to bypass the stock amp now

wat dsp r u using?

Awave.. 5 channel with built in amp

Long story short, they told me they solved it by "upgrading" to other brand dsp. Ask me top up 1.5k. I ask them to fly a kite and revert back to stock.

Rugi labor cost

Just name the shop here. Gila top up 1.5k... I think 1.5k can get u a new DSp with amp already...

This post has been edited by t3n: Jul 13 2020, 04:00 PM

i think it caused by the stock amp. what car is this? does ur car has active noise control? sometimes it produce weird noise as well.

btw other brand is it helix match?


This post has been edited by finalazy84: Jul 13 2020, 04:06 PM

Ya it's helix match

X70 premium

I say don't want then they reduce to 1.3k..haha.. Then I say don't want again they say ok try another cheap one which is also awave. Didn't work. So revert stock

Not really about the money really. Not happy with their attitude

amplifier amplified system have different RMS signal voltage than a headunit amplified system, not many DSP can take the amplified system as the initial design is to consider a "common system" upgrade rather than an amplified system upgrade.

so this will occur sometime when the DSP is not designed that way, and most of the DSP design tat way will not be too cheap.

I have the same issue with Helix Match DSP also.
The speaker tend to have tuk tuk sound even i off engine.

What shop is this? Come name & shame it here so we know what shop to avoid.