View Full Version : yet another question about speakers
amplified
17-02-2009, 08:26 PM
hi everyone, this is my first post so go easy on me. after searching the forum i cant find the answer to a question i have and that is that if i have some 600watt max speakers at 8ohm connected to a 1200w amp would be ok if i connect some 4 ohm speakers via the 8 ohm speakers????
Penfold42
17-02-2009, 08:28 PM
Hi,
Please take a few minutes to read this -
http://www.mobilediscodirectory.co.uk/forums/showthread.php?t=11711
Thank you. :)
501damian501
17-02-2009, 08:31 PM
ahh i think this is how we get 16ohm or 2ohm tone, :D :D :D
if this is the case, i would never run at 2ohm, only 8ohm and for emergencys 4ohm.
Excalibur
17-02-2009, 08:45 PM
hi everyone, this is my first post so go easy on me. after searching the forum i cant find the answer to a question i have and that is that if i have some 600watt max speakers connected to a 1200w amp would be ok if i connect some 4 ohm speakers via the 8 ohm speakers????
Short answer, probably not. :( Giving us make and model of bits concerned will help, but I still have a feeling the answer's no.
amplified
17-02-2009, 09:14 PM
Short answer, probably not. :( Giving us make and model of bits concerned will help, but I still have a feeling the answer's no.
Ano it isnt the proberly the easiest question to answer and part of the reason i cant find an explanation on it anywere. i have a C audio 1200w amp and 2 600w max QLX pro speakers. i have seen some hh 200w max speakers at 4ohm i was thinking of purchasing to add a bit more umph. just wanted to know if it was a good idea to do this
nigelwright7557
17-02-2009, 09:25 PM
The problem starts when you run the amp loud at below the minimum ohmage. The power supply runs out of amps and you could blow a fuse.
Excalibur
17-02-2009, 09:32 PM
Ano it isnt the proberly the easiest question to answer and part of the reason i cant find an explanation on it anywere. i have a C audio 1200w amp and 2 600w max QLX pro speakers. i have seen some hh 200w max speakers at 4ohm i was thinking of purchasing to add a bit more umph. just wanted to know if it was a good idea to do this
Ah, you see now we're making progress. :D
1) Don't buy 4ohm cabs.
2) If poss, get an identical pair of 8ohm cabs.
3) Failing that, get a pair of 8ohm cabs of similar sensitivity.
4ohms are verboten in this scenario, especially if they're lower rated, as they'll actually get more of the available power. :( :(
I don't know if the C Audio is rated down to2ohms, but a mismatch like this is out.
Edit:
The problem starts when you run the amp loud at below the minimum ohmage. The power supply runs out of amps and you could blow a fuse.
Come on Nigel, read the :Censored: post properly. :mad: He'll blow the 4ohm cabs , cos they're gonna get most of the power. The amp may actually be rated to 2ohms, C Audio is not a bad make.
nigelwright7557
17-02-2009, 09:55 PM
Come on Nigel, read the :Censored: post properly. :mad: He'll blow the 4ohm cabs , cos they're gonna get most of the power. The amp may actually be rated to 2ohms, C Audio is not a bad make.
Not if the 4 ohm cabs are a higher wattage than the amp can supply !
Its all about maths.
P=IIR. P=VV/R. P=VI
Excalibur
18-02-2009, 06:04 AM
Not if the 4 ohm cabs are a higher wattage than the amp can supply !
Its all about maths.
P=IIR. P=VV/R. P=VI
Like I said Clothears, READ THE POST!
" 200w Max at 4 ohm " The amp does 600. I seem to remember you warning against such practices. ;) Sometimes Nigel I truly despair of you. :( :(
BTW. Don't start posting as if none of us have ever heard of Ohm's Law, or are incapable of basic maths. Pillock!
Peter - have to agree with you
As for ohms law, it does talk a little understanding to know what it means and how to work it out but for the sake of this thread, there is no need for it.
Imo, I would of gone for 4ohm cabs as the amps would cheaper. The higher the resistance (ohms) the more the amp will cost to produce the same amount of power (watts) as a 4ohm load.
It doesn't matter if you have 8ohm cabs or 4ohm cabs. If you run to much power into the driver then it will fry.
Having said that, you can run more power into the driver but this can be risky unless you know what you are doing.
For a 200 driver, I would go for a 300 per channel amp at what ever ohms the speakers and back down the amp.
Excalibur
18-02-2009, 04:46 PM
Peter - have to agree with you
As for ohms law, it does talk a little understanding to know what it means and how to work it out but for the sake of this thread, there is no need for it.
Imo, I would of gone for 4ohm cabs as the amps would cheaper. The higher the resistance (ohms) the more the amp will cost to produce the same amount of power (watts) as a 4ohm load.
It doesn't matter if you have 8ohm cabs or 4ohm cabs. If you run to much power into the driver then it will fry.
Having said that, you can run more power into the driver but this can be risky unless you know what you are doing.
For a 200 driver, I would go for a 300 per channel amp at what ever ohms the speakers and back down the amp.
Thanks for the support Tom, but again, I think you're answering a question the OP hasn't asked. ;) He has 8ohm cabs already, so buying 4ohm ones is a bad idea. I repeat point 2) as the best option.
Thanks for the support Tom, but again, I think you're answering a question the OP hasn't asked. ;) He has 8ohm cabs already, so buying 4ohm ones is a bad idea. I repeat point 2) as the best option.
Whoops. :bang: :o
Mixing different ohm loads is a no go unless you know what you are doing. To keep it simple, stick with a piar of 8 ohm cabs. The amp will cost a bit more but as it's for low wattage speakers then it's not really a problem.
It becomes a problem if you need 1000 watts at 8ohm. That would get quite expensive.
I would go with what Peter has said. :)
nigelwright7557
18-02-2009, 10:02 PM
Thanks for the support Tom, but again, I think you're answering a question the OP hasn't asked. ;) He has 8ohm cabs already, so buying 4ohm ones is a bad idea. I repeat point 2) as the best option.
Its possible to get different volumes with 2 speakers of the same ohmage with different sensitivities, never mind with different ohmages.
Excalibur
18-02-2009, 10:06 PM
Its possible to get different volumes with 2 speakers of the same ohmage with different sensitivities, never mind with different ohmages.
A point fully covered in post #7 I feel. Do try to keep up.
nigelwright7557
18-02-2009, 10:15 PM
As for ohms law, it does talk a little understanding to know what it means and how to work it out but for the sake of this thread, there is no need for it.
.
I dont agree.
One of my setups is a 18inch 6 ohm speaker in conjunction with a 4 by 10inch cab with 8ohm speakers in it.
I have 2 pairs of two speakers in series then in parallel giving 8 ohms.
Without ohms law I couldnt have worked it out.
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