Kicker zx1000.1 and 15" L7 setup help

[zacritz929]

I will be running an l7 at 2 ohms (1000w rms). 2 x 1000= 2000. sq root/2000 = 44.72v.

Now im confused becuase the manual for the amp says the input sensitivities are:

high level 250mv-10v

low level 125mv-5v

but dont I need it to go to 44.72?

On the gain knob on the amp there isn't any numbers.

Ive read the guide on setting gains using a dmm but am a little confused. Would I hook the leads up to the pos neg terminals on the amp and turn the gain up until the meter reads 44.72v? (playing a -3db 50hz test tone at 3/4 HU volume)

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[Lakota 5,000+ posts]

I will be running an l7 at 2 ohms (1000w rms). 2 x 1000= 2000. sq root/2000 = 44.72v.
Now im confused becuase the manual for the amp says the input sensitivities are:

high level 250mv-10v

low level 125mv-5v

but dont I need it to go to 44.72?

On the gain knob on the amp there isn't any numbers.

Ive read the guide on setting gains using a dmm but am a little confused. Would I hook the leads up to the pos neg terminals on the amp and turn the gain up until the meter reads 44.72v? (playing a -3db 50hz test tone at 3/4 HU volume)

The voltage they are referring to is the input voltage from the headunit (via rca's) to the input on the amp. You are calculating output voltage to the subwoofer.

There doesn't need to be numbers on the gain knob; set it to where it's appropriate. Your method will work, but 3/4 volume isn't exactly, imo, the best place to set it. Set the gain to an appropriate listening level (before distortion), this can't really be defined as 3/4. It would be safer to set the gain to a # less that 44.72v. If you have any questions pm me and I'll be glad to help.

 

[thegreatestpenn 5,000+ posts]

If you don't want to use a DMM, just set them by ear. Your ear is quite good at setting gains if you know what distortion sounds like. Sure, your ear can't hear clipping, but unless you have really high input voltage with the gain very high and bass boost up, you should be fine

 

[Lakota 5,000+ posts]

If you don't want to use a DMM, just set them by ear. Your ear is quite good at setting gains if you know what distortion sounds like. Sure, your ear can't hear clipping, but unless you have really high input voltage with the gain very high and bass boost up, you should be fine

It takes a decent amount of distortion in the lower frequencies for the ear to detect. However, it can give you a good idea of where it should be.

The best possible way to set gains is with an oscilloscope, but not everybody has access to one.

 

[basssquared 10+ year member]

true that