# Quality Control **URL:** \ **Category:** Shift518 Automotive\ **Created:** [April 2, 2010, 11:35am UTC](https://forums.speedlife.net/t/quality-control/251261 "2010-04-02T11:35:17Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![jdaniels](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdaniels/32/6399_2.png) [@jdaniels](https://forums.speedlife.net/u/jdaniels)\ **Post date:** [June 25, 2010, 12:11pm UTC](https://forums.speedlife.net/t/quality-control/251261/10 "2010-06-25T12:11:51Z")
> [@More rice for the STi](https://forums.speedlife.net/t/more-rice-for-the-sti/32961/37): > > A little confused about your logic here. Maybe I am just misunderstanding but the way you have it worded, it sounds as if you are figuring it out using a High level input which in MOST cases is the wrong way to go. Low level inputs are normally the best quality because you are not “double amplifying” the signal. In which case you are better off matching the power of the amp to the speakers (keeping in mind 4ohm vs 2 ohm vs \_\_\_\_, and the bridging capabilities of the amp) and leaving the head-unit out of the equation. I was completely confused by that as well. The wording of the post suggests that a 200w head unit with a 300w amp is 500w… It’s not. It will still be 300w, regardless of the high level input from the head unit. Truth be told, using high level inputs is a severely broken method as the SNR degrades substantially. If you must use it, use it only for subwoofers. I like that he took the time to make this and I don’t want to be a dick, but the information is hardly spot-on. --- _[View the full topic](https://forums.speedlife.net/t/quality-control/251261)._