1thing i just dont get about setting gain...

[SQBubble 10+ year member]

how can u know what max. voltage should it read on the DMM so it isnt givin' clipped signal?

on jl's web site, it says for each jl's amp.

i dont get it...

Click to read more...

 

[Thermem mermem 10+ year member]

im not to sure either but heres this if u havent seen it or if it helps at all

http://mobile.jlaudio.com/support_pages.php?page_id=143

 

[Fast1one 10+ year member]

how can u know what max. voltage should it read on the DMM so it isnt givin' clipped signal?on jl's web site, it says for each jl's amp.

i dont get it...

This is what the amp is rated to put out, the RMS watts have just been converted to AC volts....
To do this with any amp, take its rated power (RMS) at whatever ohm load it puts it out...

Multiply both numbers (Watts * ohms) and then take the square root of the product...this is the number that should be on the DMM...no higher

Can be lower if the install calls for it ( IE you dont need all the power) Good luck

 

[T3mpest 10+ year member]

Or to save time over a DMM simply turn you HU up to about 3/4 volume and increase gains until you hear stress from the speaker or until it's as loud as you'd ever need it. If the former comes first, the back it down a little bit once you begin to notice it not sounding quite right. Odds are you 'll get "common sense" results that are close to the DMM, with room leftover for low record volume.

 

[supa_c 5,000+ posts]

how can u know what max. voltage should it read on the DMM so it isnt givin' clipped signal?on jl's web site, it says for each jl's amp.

i dont get it...

The proper way is to use an oscilliscope to see when your signal is clipped.

A DMM wont tell you that

 

[SQBubble 10+ year member]

so with my amplifier, 800rms @2ohm

800x2 = 1600

sq.rt (1600) = 40v

if i set this with 0db 45hz test tone.

do i have a chance of having clipped signal or it is for sure i wont have any clipping?

that is with a battery just for the system itself, if that help.

thx

 

[JimJ 5,000+ posts]

With a 0dB tone, the chances of you clipping the amp with normally recorded music are very, very small.

 

[SQBubble 10+ year member]

With a 0dB tone, the chances of you clipping the amp with normally recorded music are very, very small.

alright thx

why would people use -3db and -6db or wtv test tones then?

 

[JimJ 5,000+ posts]

Because music isn't recorded at a 0dB reference level, usually...so by using that level to set your gains, you're making the tradeoff of not using all your amplifier's potential in return for staying well under the clipping threshold...

Set it at -6dB, and you run the risk of clipping whenever there's a musical transient that's recorded higher than that...

 

[SQBubble 10+ year member]

Because music isn't recorded at a 0dB reference level, usually...so by using that level to set your gains, you're making the tradeoff of not using all your amplifier's potential in return for staying well under the clipping threshold...
Set it at -6dB, and you run the risk of clipping whenever there's a musical transient that's recorded higher than that...

ohh now i get it!

so wut all of u usually set it at? 0db or -3db?

thx alot JimJ