The HK system is definitely a decent factory system, with a few caveats I’ll explain:
First about me. My previous truck was a Tacoma that I installed a full-on custom sound system — full sound deadening, head unit, amps, component speakers, sub. It was the best audio system I’ve ever heard in a vehicle. I knew I’d sacrifice going to the HK system, but didn’t want to spend the time and money doing another full custom system.
I got my truck two months ago and was immediately very disappointed with the HK system. The main problem — I was listening to Sirius radio. Once I figured out the source was the primary issue, I loaded up a thumb drive with my entire music collection. Instantly much better. It was louder, more clear, and more detailed, but it still lacked high frequency detail and imaging.
A number of posts recommended replacing the two corner dash speakers with 3.5” Infinity 3032CFX. I did that today, and the difference is night and day. Most of the highs I had been missing were suddenly back. The improvement really surprised me.
I’ve read conflicting recommendations on whether or not to replace the center Dash speaker with the Infinity. I didn’t, primarily because I figured imaging would be better with crisp highs separated on the dash in the corners. Based on what I heard today I think that was the right call.
I won’t put this in the same category as the custom system in my Tacoma, but for a factory system with $70 worth of speaker swap, it’s entirely serviceable. And a lot cheaper. Now that the highs are back I noticed the low end is a bit muddy, and if you’re into hip-hop the sub won’t satisfy you. But for rock, jazz, and instrumental, it meets my needs. I might some day swap out some other speakers, but right now I don’t feel the need.
The speaker swap was very easy. Probably 45 minutes start to finish. Happy to give any installation advice. Bought it all on Amazon, speakers ($50) and wire adapters ($15).