amp ohm question - Saxperience

jallen · 27th September 2009, 02:36

ok i have a set of 13cm 4 ohm front components and i want to get a set of two ohm jbl compoonents and i was just wandering 2 ohm aand 4 ohm on the same amp is that ok ???? thats the amp >>http://caraudiosecurity.com/shop/pro...d/1180.htmland theres the specs >>>http://www0.dealtime.co.uk/xPF-JBL-J...nnel-Amplifier 4x50 watt rms at 4 ohm and 4 x 75watt rms at 2 ohm so does this mean 4 ohm speakers are beter slash more power full ??? need to no some as i wana get this in the next few weeks

claff · 27th September 2009, 10:47

ok are you bridging the amp? if you are then you cant go lower than 4 ohm because when you bridge an amp it puts more stress and this one wont handle it.

As a rule for 4channel amps, if they are ok for 4x 2 ohm speakers then they the minimum impedance you can use for bridging is 4 ohm. When you bridge a speaker over 2 terminals it effectively halves the impedance load on each.

So if the amp is only running these comps and nothing else at all (e.g. sub, rear speakers), then with 4 ohm your already getting the most out of the amp and going even lower will cause it to probably overheat or damage it.

Ashleyp · 27th September 2009, 11:16

it cant be bridged if 4 channels are being used to run 4 speakers

it'll be fine

claff · 27th September 2009, 11:29

oh right i misread, i thought he was replacing the 4 ohm comps with 2 ohm

Ashleyp · 27th September 2009, 11:38

Quote:

Originally Posted by claff

oh right i misread, i thought he was replacing the 4 ohm comps with 2 ohm

hmm, maybe he is... i read and assumed he was running all 4 speakers

the amp can run 2ohm, but as you say, cant be bridged, just use channel 1 & 2

no speaker is more "powerful" than another, they can handle power in different ways, the impedance (ohms) is just a measurement of how much current is drawn from the source, more power can be had easier with higher impedance.. IE: 1ohm > 8ohm

jallen · 29th September 2009, 18:11

ok so a par of 4 ohm speaker and a pair of 2 ohm speakers is ok then yea ?

McBain · 29th September 2009, 19:20

Ai it'll be ok providing you wire them properly. Might need a bit of tweaking to get a balanced sound tho.

jallen · 29th September 2009, 20:27

wat do u mean by balance it wont be perminante im gona buy two set of the two ohm ones so ......

McBain · 29th September 2009, 20:50

Quote:

Originally Posted by jallen

wat do u mean by balance it wont be perminante im gona buy two set of the two ohm ones so ......

By balance I mean the 2Ohm set might be a bit louder than the 4Ohm speakers, so you might wanna adjust the gain to them a bit. Nowt to worry bout tho.

jallen · 29th September 2009, 21:26

sweet i dont mind if there louder the gona be in my parcel shelf then im sort of taking out me back seats putting a sub behind each chair and 4 comps between them and a set in the doors lol so its guna be like a van so its not guna get wrecked wen im musin it 4 work

Ashleyp · 29th September 2009, 21:33

Quote:

Originally Posted by jallen

sweet i dont mind if there louder the gona be in my parcel shelf then im sort of taking out me back seats putting a sub behind each chair and 4 comps between them and a set in the doors lol so its guna be like a van so its not guna get wrecked wen im musin it 4 work

if 1 set is guna be in a parcel shelf

itd be better to not have them atall

jallen · 29th September 2009, 21:40

not perminate ley im takin out bk seats and build sort of half wall so my tools dont slide in my back in that wall are going 2 subs and a set of comps but im gettin it all together bit by bit its the only way i can afford it so...

claff · 29th September 2009, 21:45

yea man thing about sounds in your car is you dont want millions of speakers everywhere, a set of £100 comps will sound a lot better than 2 sets of £50 comps by a mile. lots of speakers will jumble up your sound, the less sources of sound (speakers) you have, the better. just left/right and a sub.