Sub amp tuning

[bbeljefe]

Correction, the system has 4.8v preouts. I tested them just a little bit ago, and i got 2.4v from each rca input on the hu on a 50hz -6db test tone. Assuming this is right since 2.4+2.4 = 4.8?

Sounds like the HU is fine.... need to find out what's up with those signal wires...

 

[bmk6795 10+ year member]

Sounds like the HU is fine.... need to find out what's up with those signal wires...

i don't think it's the wires because i got the same .65v reading when testing the hu, i think i had bad connections when i got those readings

 

[bbeljefe]

i don't think it's the wires because i got the same .65v reading when testing the hu, i think i had bad connections when i got those readings

Ah, well then back to my first thought... teh box is too bigz. Make it smaller and I bet it will hit hard on music.

EDIT: You could either stuff it with something to reduce the volume or retire it to service in a home theater setup and build another one. I bet it would get stupid loud in a big room, lol.

 

[Bomtillington]

hey man i had that same head unit what happens is man it does something funky with the voltage turn the gain up to about 1 oclock and itll be fine with no clipping and itll go to 47 volume without clipping but with the unit the gain does have to be high

 

[bmk6795 10+ year member]

hey man i had that same head unit what happens is man it does something funky with the voltage turn the gain up to about 1 oclock and itll be fine with no clipping and itll go to 47 volume without clipping but with the unit the gain does have to be high

you had the jvc kd-ahd65? and there is no clipping until 47?

 

[Bomtillington]

Yes sir the gains have to be set pretty high man on all amps I had no less the 1 o'clock gain

 

[bmk6795 10+ year member]

Yes sir the gains have to be set pretty high man on all amps I had no less the 1 o'clock gain

so clipping starts at 47 so set the gains at 46? or clipping stats after 47? thanks for the help btw.

 

[bmk6795 10+ year member]

Ah, well then back to my first thought... teh box is too bigz. Make it smaller and I bet it will hit hard on music.

EDIT: You could either stuff it with something to reduce the volume or retire it to service in a home theater setup and build another one. I bet it would get stupid loud in a big room, lol.

here is another thing throwing me for a loop, I've got a 70 amp alt, and big 3 done with stock battery, i had the amp set for 1200 watts with no voltage drop, it's now set at 1800 watts and i still have veryyyyyy little drop, like to 13.5, how's that possible? i understand the amp is very efficient, but with my audiopipe ap 1500 i had hella drop on 900 watts.

 

[bbeljefe]

Now you know the importance of efficiency. If an amp is only 50% efficient and it draws 100 amps of current, then you essentially have a 50 amp heater and a 50 amp audio amplifier that you have to work harder to get good sound from. Bump that to 75% efficiency and your heater just got half sized while the audio amp is 150% easier to get good sound from.

Thus, in reality, the 50 amp heater got cut in more than half because you don't need to pull a full 100 amps of current in order to achieve the same sound pressure...

EDIT: Sorry if that metaphor sounds kinda dorky... it was all I could think of at the time.