woofer inductance

[lolojr1]

not sure if this should be in the amp or caraudio section i will move it if it is in the wrong place

can there be any adverse effects to running 36 exactly the same brand new woofers on one class d amp?

the impedance was just over the rated 1ohm measured at 1.1 ohm and the input voltage never dropped below 14 volts

9 groups of single 4 ohm wired to 4 ohms and then paralleled to just over 1 ohm total

i spoke with the manufacturer of the woofers and he told me about an inductance problem that might/will happen from this

2 of the mosfets completely melted right off of the heatsink

all of the woofers were checked and double checked for shorts and phase they all move the same direction

im curious now because my line array will get finished soon and i have 36 mids per channel and i dont want to do the same to my amp

[95Honda]

Inductance will lower with drivers in parallel and increase when they are in series. If you are doing series/parallel or just parallel then no problem. You would get a lot of inductance if you wired a whole bunch in series, but you would also get very high impedance....

[PeteMcK]

?
4/9= 0.444

[AndrewT]

I'm not sure what "9 groups of single 4" means, but I think Pete is on the track with 4/9 giving an impedance very much lower than 1ohm.
Why on earth aim for 1ohm when 4ohm or 8ohm works perfectly well?

[lolojr1]

sorry let me clarify

every 3 are series up to 12 ohms

then there are 12 groups of 3 paralleled back down to 1 ohm

my mistake i was remembering alot of different wiring configurations and that one stuck in my head fr some reason


the reason to use 1 ohm is that is where this amplifier is rated to be used at

[AndrewT]

the amp manufacturer is telling fibs.

[ßart West-VL.]

Originally posted by AndrewT
the amp manufacturer is telling fibs.

I didn't know what "fibs" meant.. now I do:
http://www.urbandictionary.com/define.php?term=Fibs

Thanks Andrew, I needed that.

[tinitus]

A 4ohm driver may only be 3ohm dc

High sensitivity might help on using a classD fore low impedance drive, but you may actually not achieve high sensitivity at all

[lolojr1]

Originally posted by AndrewT
the amp manufacturer is telling fibs.

actually this is one of those crazy low impedance amplifiers it has been wired to .25 ohm and worked fine but that wasn't on 36 woofers it was 2

[lolojr1]

anyone have any idea what this could do to an amplifier?

is this the same as a line array with a final impedance of (?) can this damage an amplifier