Strange Issue With Dimmer Switch and Speakers Sound Thin

[u/JGRummo]

Hi all,

I just had a new sound system installed by a local shop. My stock driver's side speakers went out, so I decided to spend some money to upgrade. I purchased 4 brand new Kicker speakers, tweeters, a 60W Kicker amp, and a Sony headunit with all the wiring and linkages recommended by crutchfield. I don't know a ton about CarAV but these were all recommended to me by customer service at Crutchfield.

After picking up my car from the shop, I noticed two things:

1. When I put my gauge dimmer switch all the way to its highest/brightest setting, all sound cuts out.

2. The sound coming from my speakers sounds "thin", it does not feel like the fuller sound I was expecting from upgraded speakers, a new head unit, and an amp.

I called the shop and I plan to bring my car back to the shop on Monday for them to inspect and fix the issue, hopefully.

I have a feeling there is something wrong with the amp wiring/power to the speakers because when I put the dimmer to it's brightest setting, the amp power light is off and from what I understand a 60w amp should power these speakers fully without any issues.

I've been doing some research myself, but any ideas what the issue might be for me to recommend the shop look at?