14 replies to this topic

[Darkness_GR]

Hey Guys,

I Got my new Ute yesterday and decided to go with the full Focal Kit 7 Be, now i have to decide with the subs and amp,

what i was thinking was 2 x 27v1's, and run the Be's and the 27v1's off a FP5.500

my question is do you guys think that the sub channel on the 5.500 (300wrms @ 2ohms) will be enough power to run the 2 27v1's?

also the dealer i was talking to said that running the two subs so 4 + 4 ohms for 2 ohms to the amp (which is right, but he also said that the subs would see 300wrms each when running at 2 ohms, this is wrong isn't it, they would only see 150wrms each wouldn't they.

the subs are rated at 250wrms and are single 4ohm

cheers, Grant

[Damo95]

yes, the subs would be seeing 150wrms each..
not sure how they'd sound being underpowered but a little more than rated goes a long way.. plus they arent as efficient as the larger diameter V1's..
imo, its hard for me to say..

[Darkness_GR]

or do you think it would be better for me to run the utopias off the FP2.150 i allready have and get 2 x 27v2's and run them off a FP1.800

[Shreknos]

get the 1.800 m ate..

when you load all the channels on a 5 chan down, it puts enourmess strain on the power supply, and the output may suffer...

[Darkness_GR]

if i used the 5.500, id probably bi-amp the utopias. so it wouldn't be loading it down too much but yeah probably will go the 800

[Shreknos]

Quote

if i used the 5.500, id probably bi-amp the utopias. so it wouldn't be loading it down too much but yeah probably will go the 800

bi ampiing would involve using all 4 channels for speakers at 4 ohm, aand 2 ohm for the sub,
all channels loaded means fk all power

[Fury♫]

Why not get a 4ch for the splits, and bridge the 2ch for the sub(s)?

[Damo95]

seeing you've already got the FP2.150, i'd use that for the utopia's run passive.. c'mon, focal make good crossovers that work, use them..
and get the FP1.800 for the sub(s)..

[Pulse-R]

Fp dual monitor for splits and fp1.800 for the subs.

[Darkness_GR]

Pulse-R, on May 6 2007, 02:40 AM, said:

Fp dual monitor for splits and fp1.800 for the subs.

Great idea if i had the money to afford both those amps at the minute.



And also how would i explain to someone that if you hooked up two of the 27v1's (4ohm SVC) in parrallel to the sub channel on the FP5.500 (rated 300wrms @ 2ohms) that each sub would only get 150wrms not 300wrms each?. and in technical terms too. if possible like calculations. and stuff



cheers, Grant

[mooingchicken]

the amp puts out a total of 300wrms, so if there is two subs the power is divided in half, so each subs see 150wrms

Edited by mooingchicken, 06 May 2007 - 06:45 PM.

[Darkness_GR]

i told them that, but they don't seem to belive me

[mooingchicken]

well some people you just cant help...lol

[Darkness_GR]

yeah very true, But does anyone know how to scientifically prove it so i can show them, like using ohms law or somehting like that.

just so i can proove im right,

[Pulse-R]

300 watts into 2 ohms = 24.5 volts [P=IV, I=V/R :: P=V^2/R]

24.5 x 24.5 / 2 = 600/2 = 300

since the subs are in parallel, they each get 1/2 the current, and therefore 1/2 the power (same voltage applied at the terminals, into 4 ohms.. P = V^2/R = 24.5x24.5 / 4 = 600/4 = 150)

Edited by Pulse-R, 06 May 2007 - 08:04 PM.