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System 2 x 4 channel Amps bridged to run 2 x 3 ways in each front door 

So i am running 1 amp left door      1 amp right door 

i used DD1 to find distortion point  on 1 amp it was 32 0f 35  LH channel ( Alpine Double Din unit in defeat mode )

other amp only 27 of 35  RH channel

So there's my problem 

is this correct solution use 27 as distortion point then set 10% overlap at  LH channel amp

use CC1 to set other amp RH channel to get both amps and therefore left and right channels in balance 

what i find confusing is this does the DD1 use the distortion  point as the start of its overlap calculation

which is why i have gone for using the CC1 as this i'm thinking this will sync the other amp 

thanks 

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If i remember what others have said, you want to use the amp that distorts first and volt match them the same.

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10 hours ago, Skullz said:

If i remember what others have said, you want to use the amp that distorts first and volt match them the same.

so CC1 is used to volt match is this correct ?

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Dont you only need to find the volume distortion of the headunit? Not the amps volume distortion. 

Find where the headunit outputs distorts ( amps not part of this step, you can disconect amps), use 40hz test tone to find what volume that distorts, then do the same with a 1000hz test tone. Use the lower distortion point of both, example:40hz clips at 31volume and 1000hz clips at 33volume, that means 30volume is the highest u can go without clipping, if u turn it to 31 your headunits signal clips.

So now u can set ur amp gains. Turn headunit to 30, turn amp gains all the way down. Play the tones again and set it right before clipping.

I think thats how it goes.

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Yes 06 and Skulls are correct. Since there are separate amps for the right and left channel they need to be gain matched. After you set the gain with the dd1 on your amps, measure the output voltage from each amp. Then turn the higher of the two down to the level of the lower one so they have the same voltage. Don't turn the low one up because that will cause it to clip. Please post some pictures, I would like to see this.?

 


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Get a Beer 

I will explain it completely cause i think we are on the same thinking

will post pictures tomorrow which will make it all clear 

I think the CC1 did a great job because the front end sounds so balanced

what concerned me was that 1 amp would be louder than the other as by using the DD 1 plus the gain would be higher on the amp that distorted at 32 because the distortion light would come on later 

and therefore once you add overlap also  

broncoupe 

 

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I think overlap is something different. Gain matching is matching the amplifiers outputs so they play at the same level with a volt meter.

Edited by ShadeTreeMechanic
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91 C350 Centurion conversion ( Four Door One Ton Bronco)

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CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

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Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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Overlap is where mids and tweeters crossover points meet and begin to slope off, that is something you have to play with as setting the points too close can cause high points instead of a flat response when you use an RTA.


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unless i'm wrong we are all going in different directions 

according to SMD this is correct way to set up

All connection and using the SMD  disc  as per instruction manual  

1 -  DD1plus connected to output of Amp  turn up headunit until distortion light comes on 

OK  but normally it would be a stereo 2 channel or 4 channel amp

So you now have distortion point   say 29 of 35 from headunit

Now according to Rockford who SMD support you should add 10% of overlap to the amp 

this definitely helps with the power output of the amp and normally that is setup down

But in my setup i have used 2 amps so 1 for Left channel 1 for right channel

so i now repeat the procedure above only problem on this amp DD1plus shows distortion at 32 of 35

if i now add 10% overlap this amp will be much louder than the other

because put simply the gain is turned up

this is why i think the correct thing to do here is use the CC1 to match the outputs

 

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