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Old 01-13-2013, 01:34 AM
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Default how do the legs of a circuit affect power seen?

so this is my question i was reading my auto book and i got the understanding that in parallel all legs given the same resistance will see the same power. is this correct? also series how does that work out. i had 2 fullrange speakers in my dash both 2 ohms wired in series with a 4 ohm coax this created an 8 ohm load which i paralleled with a 4 ohm load to get 2.6. my question for future wiring issues and install how does this all work out?

SIDENOTE: i have a sa-12d4 in 2.9cubes on a brz1700 at 2 ohms i dd-1'd it the other day and got a clean rail voltage at 14.2vdc of 48.8VAC which on a purely resistive load of 2 ohms would be 1190ish watts of power. IT DOES RATED. the 1700 is rated at 1700(duh) at 1 ohm which would be 41.2VAC. ive noticed not all amps assume a constant efficiency where the power doubles every time you halve the load. so would this be a flaw in the dd-1 because when this d4 dies i plan on getting a d2 recone. and if i dd-1'd out to 48.8 id be making 2380W which would surely be clipping. ive read up quite a bit about the dd-1 and IVE NEVER SEEN ANYONE BRING THIS UP. does this question hold any validity?
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Old 01-13-2013, 02:11 AM
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addressing only your subwoofer setup and thinking around it;

you are assuming too much.

#1 at your output voltage peak, the 2ohm load is not a 2 ohm load. {it's higher}

#2 you can not assume your amplifier's output into a load you don't have.

-----------------------------------------------------------------------------
the dd-1 only sets your input gains based on the best possible scenario. it does not adjust for voltage drop, THD or damping factor changes with different impedance.

honestly, a DD-1 is "good enough" compared to no gain setting utensil at all.

but,

even after you set your gains with the DD-1, you have to be smart enough to know when you need to turn a gain down. sometimes, set 'perfectly' leaves you with a system which does not have 'control' of itself.
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Old 01-13-2013, 02:33 AM
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i know i have rise and i watch my drop. i wanna say i still had rail voltage for over 1100W with the car off. im just saying some people make the dd-1 seem so glorious and it is pretty cool and has its place.

lets say i had the ultimate 100% efficient box with no rise id eventually kill the amp if i dd-1'd instead of dmm'd. id just thought id make a point and hopefully someone will come in and answer my circuitry questions.

maybe ill be able to clamp my amp tomorrow and see what my rise actually is. and i know its not just hifonics that doesnt double there power every time the load is halved.

so you have clean rail voltage for your 4 ohm output but that rail voltage may be too much over the 2 ohm rating. like with my dash its running off an old alpine 3522s rated at 12v at 30w into 4 and 45 into 2 both x2. im running it at 2 ohms so i dd1'd it lets say i set it to clean 4 ohm rail voltage what then? i know they probably rise a little from inductance but id be my active load stays under 3 ohms.

though the old fosgate p201s i put in last night and set by ear does double its power. i know power also depends on the amps ability to fight the back voltage produced by the sub/speaker. if i understand it correctly the coil moving through the magnetic field acts somewhat like an alternator or brushed dc motor and produces its own amount of voltage I THINK.

Last edited by shackleford; 01-13-2013 at 02:38 AM.
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