Stereo/ohms/speakers question

[RNRMF]

Yo.

I have a pretty standard 4 X 50 watt output head unit in Lola running a pair of 6X9's that are 4 ohms each. Can I run speakers that are 8 ohms each instead of the 6X9's or will it melt my head unit?

[Tommy Cooper]

surely you cant do any damage by trying speakers with a higher resisitance as they will draw less current ampage... v = IR and all that

They may not draw anough current to power them properly but can't damage the head unit... but check with Faz first in case my A level physics doesnt match the real world :LOL:

[Iceman]

In laymans terms the The 4x50 watts you have coming out of the stereo is more likely about 5 watts rmsx4 (true power).Now if you want to put on 8 ohms speaker that is fine it will just give you about half the power into them speakers so 2.5 watts rms. Now if you put 2 ohms speakers on and it could handle it it could give them 10 watts rms. It is more complicated than that and yes it is all mathematics and formula but i hope this way is te most simplist.
FAZ

[RNRMF]

Cool, so nothing gets fryed but they will be quieter effectively?

[chrisls]

Nope you can stick them on fine. You'll just have to tun the volume up a bit more to get the same volume.

As has been said, it's more complicated than that as they have inductance and capacitance and different levels of sensitivity and bull poop like that which makes me very confused!

[Iceman]

If you want to try and get to grips with it here is a good website to look on http://www.bcae1.com/.
FAZ

[Tommy Cooper]

well suck em and see they may be too quiet or just as loud

[Tommy Cooper]

Faz you are spoiling me with these links (like trays of chocolate balls covered in gold foil).... that link contains ohms law and algebra :LOL:

I just had a look at the TEST thats on there... question 6 is;--

6. For a sine wave, by what number do you multiply RMS power to get peak power?

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a 2
b 1.414
c 1.73
d 10

[Tommy Cooper]

mind you I had not the faintest idea what this question meant or what the answer was

10. Which types of passive crossovers use capacitors to achieve their rolloff?

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First order high pass
Second order low pass
Second order high pass
All of the above

[Tommy Cooper]

... sorry back on topic.....

Question 17 is pertinent:-

17. When driving a speaker with an amplifier who's power rating is lower than the speaker's power handling rating, how much lower can the amp's rating be below the speaker's rating without damaging the speakers?

--------------------------------------------------------------------------
a 10%
b 20%
c 30%
d It doesn't matter if the amp's power output rating is lower than the speaker's power handling rating.

answer is D

[Jam_meister]

Ok well ere goes.

the answer to question 6 is - B, 1.414

the answer to question 10 is - A, First order high pass

and as you say D for the last question :D

[Tommy Cooper]

1 out of 3 James

could do better ;)

[Jam_meister]

well considering I have no idea and was just guessing, what do you expect?

[DrDivall]

I got 17 out of 18

graph question about decibels caught me out

[Jam_meister]

on the second question you put up I was going to go for C (probably wrong as well) because about 70/75% of the time in my multi choice science module tests the right answer was C

Oh and well done Darren, good going