Brought my own speakers, amp and sub to wire up. Their labour quote is a bit less than Sheng Auto and Jackson was busy so decided to go there rather than carry my new audio gear in and out of JB.
They took quite a while to do the full setup and sound imaging for me so I was initially happy with their work. Interior wiring was also well secured and a seemingly clean install.
Testing there the volume was high so didn't notice but once I was driving home, I realised there was a whine from the speakers corresponding to the RPM. Went back to them another day for something else and asked about the whine. He told me it's because my headunit using stock one, if use aftermarket won't have. Just basically taichi away the problem. I didn't really accept his explanation but I don't like to argue with shops so I just left it at that.
Went to Sheng for another job and I asked Jackson to help me check on the whine. He told me the RCA cables used are poor quality, the equaliser(supplied by Da Sen) also not good and contributing to the whine and I think Da Sen had laid out the RCA on the same side as power cables also. He also said a very small amount of whine will be there regardless because of the amp which I fully understand and accept. He then pointed out inside my engine bay got unsecured wiring(although it doesn't really have much space to move and nothing to get into but still not good), my sub fuse was some crap baby fuse instead of the larger one used for the speakers and the place they ran the cables from the cabin into the engine bay was not secured. Jackson said small insects/animals and water can go in.
Went back Da Sen and they still maintain the whine cannot do much. Pointed out why the fuse got one baby one, he like no real explanation then ask me if I want the bigger fuse, I said ya, then they just come and change. No charge. I'm not 100% sure but one of the guys working there starting kpkbing about something, dunno if it's about me or something else though. He seemed to be making noise that the specky fella keep agreeing to everything.
Went back Sheng and told Jackson to change the RCA cable to decent one. Paid another RM225 or 235 for 3x RCA and labour. They rewired it. Headunit still stock, amp still in. Whine reduced by 80% or more. Very happy with the work done at Sheng and extremely disappointed by Da Sen. Should never have wasted my time and money to do with them and to top it off, live with a super loud and annoying whine for weeks before I had Sheng resolve it.
That said, I wanted a small bit of my tail light tinted, Jackson had told me RM40/60 depending on quality. Da Sen did for me for RM20.
That's the only kind of work I'll go back to them for. Everything else, save your heartache and time and just pay the slightly higher quote from Jackson and get the job done properly.
Side note, one of the times I was at Da Sen got SG uncle with his Porsche SUV doing work there but he was literally standing over the guy's shoulder watching the work get done and telling them to do this and that.