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?

2.5k

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