please help asap, need gain setting

[Saxo_Seann]

i read the sticky above and it says u can find out what to set ur gain at from headunit, where do u find it or what is it im looking for as no idea what its called? my headunit is cdx-mp40

please help as need it sorted asap, sean.

[craig1gk]

i just match the gain to head unit volume, it is literally how much volume the amp gains, turn up for more etc, just fiddle around until you like the sound balance

[Ashleyp]

i just match the gain to head unit volume, it is literally how much volume the amp gains, turn up for more etc, just fiddle around until you like the sound balance

Completely wrong.

I CBA to explain, quoted from CSVTR:

THE GAIN SETTING ON AN AMP...

...is not a volume control! It’s a signal matcher. (This is the biggest thing I must stress to everyone as setting this up wrong is the main cause for damage to a speaker). If you’ve got a 5v head unit the gain should be set to 5v, if you’ve got a 4v head unit set it to 4v etc. This is what you will produce max volume at anything over this figure and you will be sending a clipped signal from your amp to your speakers and this is what does damage.

The best way to have this done is to scope it or get someone at an audio meet to scope it for you, but if you can’t do this then the next best way is to set the volume to roughly 75% on your head unit and gradually increase the gain until you hear any sort of distortion, when you reach this point turn the gain back a touch and you should be fine.

For some people this could result in the gain being set at almost max and some around half way, it all depends on the head unit but the overall volume will be the same on both set-ups, don’t think “my mates got his set at 80% and mines at 50% his is going to be louder” it doesn’t work that way, some head units are better at delivering max volume at lower gain levels than others.

How many times have you heard someone say:

Quote:

"You think this is loud, you should hear it when the amps turned all the way up it's only at half way at the moment"

This clearly shows they have no knowledge of car audio and I guarantee that the speakers won't have a long life span.


i read the sticky above and it says u can find out what to set ur gain at from headunit, where do u find it or what is it im looking for as no idea what its called? my headunit is cdx-mp40

please help as need it sorted asap, sean.

It will be called signal output or signal, check the manual.

It will be in V (volts) so shouldn't be hard to find.

If not, just do as in the quote above, set volume to 75%, turn up gain until you hear distortion, then turn down a tiny bit, job done.

[bethell]

^^^^ really good just sorted out mine using this from how a mate set it up 10x better cheers :)

[Saxo_Seann]

yep sorted mines out thanks, subs dont cut out at all now even turned up to max vol, also turned subsonic off aswell which helped a lot!

[liam_b]

best way to set a gain up is via a scope

yep sorted mines out thanks, subs dont cut out at all now even turned up to max vol, also turned subsonic off aswell which helped a lot!

what box is your sub in? subsonic is a very good thing to have you might of just had it up to high i normaly set them too 20hz depending on the box

[shellz090]

will be doing this soon when i get my new stereo!