Amp setting help

[canadian_mofo 10+ year member]

Ok well as for the gain i just put it up about maybe 40% so hope its fine dunno whether i should put it up more or down more without doing that gain setting tutorial but i dont have cash to go spend on one of those digital voltage meters so im guessing 40% would be safe. Its the other settings im not to sure on. To give you an idea i have a pioneer deck with two infinity plate 4X6's running off it. My amp a 400watt profie AP400 has two alpine 4ohm type R 6.5 componones running off it. Now the crossover options on the amp are low/full/high dunno what to put it on. Right now i have it on full. If i switch it to low seems like the volume reduces consideraby. Then there are two freq settings i dont know what to set them too. Really no info in the manual with the amp either on what i would set them too. Any info would be great or point me in the right direction.

heres a link to the amp i own if it helps: http://www.millionbuy.com/prfap400.html

Click to read more...

 

[squeak9798 5,000+ posts]

Ok well as for the gain i just put it up about maybe 40% so hope its fine dunno whether i should put it up more or down more without doing that gain setting tutorial but i dont have cash to go spend on one of those digital voltage meters so im guessing 40% would be safe.

Listen for distortion. The speakers will let you know when they aren't happy.

Its the other settings im not to sure on. To give you an idea i have a pioneer deck with two infinity plate 4X6's running off it. My amp a 400watt profie AP400 has two alpine 4ohm type R 6.5 componones running off it. Now the crossover options on the amp are low/full/high dunno what to put it on.

You want to set it to highpass (high)

Highpass crossovers attenuate the frequencies below the crossover point. You want to do this, as it will decrease the amount of bass being played by the 6.5" mids.

Right now i have it on full. If i switch it to low seems like the volume reduces consideraby.

Yeah...lowpass crossover attenuates the frequencies above the crossover point...not something you want to do to fullrange speakers.

Then there are two freq settings i dont know what to set them too.

I don't know what both of them are....but one of them should set the crossover point for the highpass. There's no right or wrong when setting the frequency, just set it to whatever sounds best.

Will probably be somewhere in the neighborhood of 60hz to 100hz....but just set it to where ever sounds best.

 

[canadian_mofo 10+ year member]

You want to set it to highpass (high)

Highpass crossovers attenuate the frequencies below the crossover point. You want to do this, as it will decrease the amount of bass being played by the 6.5" mids.

ok now im confused hehe. I want to eliminate all the bass? Arnt these mids where my bass would come from? I know they arnt subs and im not looking for subs but the little bit of bass i do get id want out of these yes/no. cause the 4X6's in the rear are deffinatley not for bass. If im way off lemme know as you can tell im new at this.

 

[PatFitz9 10+ year member]

the high pass crossover says what frequencies get played. say it's set at 100Hz, anything below that (bass notes) aren't going to the speakers, frequencies above it get played.

 

[3onDubs 10+ year member]

ok now im confused hehe. I want to eliminate all the bass? Arnt these mids where my bass would come from? I know they arnt subs and im not looking for subs but the little bit of bass i do get id want out of these yes/no. cause the 4X6's in the rear are deffinatley not for bass. If im way off lemme know as you can tell im new at this.

You're going to want some bass from your mids, but only that bass in the middle frequency (that's why they're called mids). Extremely low frequencies, for example, are only supposed to be handled by subs and normal 6.5's will sound distorted. That is why you have to find the lowest possible frequency that your 6.5's can play before soundind distorted (or rattling). You can set the HPF number after you set the gain....generally the HPF is set between 80 and 100 HZ. You should be safe ar around 90 HZ as a rough guestimate.

To set your gains, you don't need a voltmeter...just your ears. Turn up your volume to about 95% and then turn up your gain until you start to hear distortion (start from the minimum gain setting). After you start to hear distortion, turn the gains back down until the sound is clear again and then leave the gain there. You should never touch it after this, but rather, take the opportunity to adjust your HPF. Turn the music up again and then set the HPF to about 70 HZ. The bass will sound muddled and overplayed at loud volumes. Move the HPF up until all the distortion is gone and then leave that there.

After that, your all set. You might want to pick a track that has lots of various bass frequencies to be safe.

 

[canadian_mofo 10+ year member]

ok thanks very much guys i appreciate it.

 

[canadian_mofo 10+ year member]

well got it all set but its weird no matter what the settings when i play metalica justice for all CD there is this echoy bass that seems to blur maybe its my HU settings? I cant figure out how to really set my HU properly though its not so basic like some its a pioneer with all these presets and shit really pissing me off. but seems like its just metalica specifically the justice for all CD.

 

[SuperTrooper 10+ year member]

You need to get you manual out for your headunit and play around with it and set it to your likeings. Thats what I had to do with my pioneer. If your not running any subs you may want to make sure your sub setting/pre outs are turned off or turned way down, Considering how you have it all wired up. Good Luck.