Post by
Looneybomber »
https://forums.nicoclub.com/looneybomber-u14304.html
Wed Feb 11, 2009 8:25 am
Due to incorrect terminology, improper grammar, and a lack of capitalization, I'm having a hard time decyphering your post.
Let's see if I can rephrase it...
I've tried reducing the bass boost within the headunit, yet I still hear distortion from my speakers at some erroneous volume level. I've thought about using an amp to allieviate the stress on my headunit, but I only have one set of pre-amp outputs, which has a selectable lowpass crossover that can be by-passed.
What I'd like to do is add a subwoofer, then use the line level outputs of the headunit to power an external amp with only RCA inputs. How can I make this work?
Is that pretty close?
If so, hook up the sub amp as usual using the pre-amp outs on your HU. The amp for your mains, however, will need a line level to RCA converter, much like this.What that does is drop the voltage to an appropriate level for the amp, otherwise at some erroneous volume level like 8, you could be sending a strong enough signal to your amp to clip it...which means bye bye speakers.
Also, I tell this to everyone. The greatest source of distortion comes from your speakers, not your amp. If, however, you're driving your amp into clipping, distortion will skyrocket! There are also various harmonics of distortion. The lower order, even harmonics, can at times even sound plesant, within moderation. Upper level harmonics, H6+ will always sound bad and will be audible at much lower levels of distortion, possibly even below 0.1%. On the flip side, it may take as much as 10-15% distortion for an H2 to be audible. Some blind tests I've seen, even had people reporting no audible H2 distortion even at 20-25%. But that's enough out of me.