ok I was just reading another site and it said that if an amp is rated at less power than the speakers, the speakers would clip and over time be detrimental to the speakers. Now, seeing that when I hook these up it will be running 100W per channel, when each channel can max at 200W. Would I have to worry about clipping with this set up?
It's all about impedance matching and maximum power transfer between source and load (amplifier and speaker).
Check Here for lots of good useful information.
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Check Here for lots of good useful information.
Also, click here.
PowerEngineer
Diamond Member
- Oct 22, 2001
- 3,598
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I think I can help out on this question! 
Power supplies give a wattage rating and a load impedance because the wattage delivered to the load will change with the load's impedance. A real world power supply can be modeled as an ideal voltage source with a resistance in series. The load resistance is connected across the output to close the circuit (i.e. voltage source with the two resistances in series). This means that some of the power will be consumed inside the power supply and some consumed by the load. The split between what's consumed inside the power supply and what's delivered to the load is a function of how big the load resistance is compared to the internal resistance. As I recall (and should be able to demonstrate if I remembered how to do derivatives), the maximum power delivery to the load occurs when the load resistance is equal to the internal resistance. So if your speakers are actually 4 ohms, then the power delivered to them will be roughly 89% of the power supply rating at 2 ohms. So you do not have to worry about blowing them out.
Another obvious possibility is to get another set of 4 ohm speakers to form parallel pairs which will have a 2 ohm resistance.
Good luck!
Nuts! KMurphy beat me to it!
Power supplies give a wattage rating and a load impedance because the wattage delivered to the load will change with the load's impedance. A real world power supply can be modeled as an ideal voltage source with a resistance in series. The load resistance is connected across the output to close the circuit (i.e. voltage source with the two resistances in series). This means that some of the power will be consumed inside the power supply and some consumed by the load. The split between what's consumed inside the power supply and what's delivered to the load is a function of how big the load resistance is compared to the internal resistance. As I recall (and should be able to demonstrate if I remembered how to do derivatives), the maximum power delivery to the load occurs when the load resistance is equal to the internal resistance. So if your speakers are actually 4 ohms, then the power delivered to them will be roughly 89% of the power supply rating at 2 ohms. So you do not have to worry about blowing them out.
Another obvious possibility is to get another set of 4 ohm speakers to form parallel pairs which will have a 2 ohm resistance.
Good luck!
Nuts! KMurphy beat me to it!
Adul
Elite Member
Adul
Elite Member
lets keep it simple here
you amp is
100 watts X 2 channels @ 2 ohmns
So that is 100 watts per channel for a 2 ohmn load.
But you will be placing a 4 ohmn load on each channel. So the power sent to the speakers will be halfed.
it will be
50 watts x 2 channels @ 4 ohmns.
You speakers shall handle this just fine. You will not blow them or anything.
you amp is
100 watts X 2 channels @ 2 ohmns
So that is 100 watts per channel for a 2 ohmn load.
But you will be placing a 4 ohmn load on each channel. So the power sent to the speakers will be halfed.
it will be
50 watts x 2 channels @ 4 ohmns.
You speakers shall handle this just fine. You will not blow them or anything.
Adul, thats what i thought too, but I am still seeing differing opinions on this... WHO IS RIGHT?!?!?!?!
This. Take for instance my amp. rated for 600W @ 2ohm and 300W @ 4ohm... doesn't get any easier.
PowerEngineer
Diamond Member
- Oct 22, 2001
- 3,598
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I AM!
It's not quite as simple as Adul and frizzlefry think, but the important point that we all agree on is that using higher impedance speakers will reduce the maximum power your amplifier will deliver. Your 80 watt continuous speakers should be fine with that 100 watt/channel amplifier. I expect you'll run into objectionable distortion long before you reach maximum amplifier output anyway.
Before taking advice from me, you should remember that I also believe in evolution. :Q
Good luck!
Evadman
Administrator Emeritus<br>Elite Member
- Feb 18, 2001
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No your not. minendo is just explaining it from the speakers end instead of the amp's end that everyone thinks of it as, so it messes with your head unless you think it out.
If your amp is rated to put out 100w x 2 @ 2 ohms, then if you hook one speaker up to each chanle, then the amp will put out 50 watts to each speaker because the resistance ( ohm's ) are doubled. HOWEVER if you connect the 6 x 9's in parallel, then hook the entire setup to your amp on one channel, it will put out 100 watts to the set ( still 50 watts per speaker ) but what is really nifty, is your amp can be bridged ( hooking the positve on one chanel and the negitive on the other ) so with the speakers in the parallel setup, the speaskers will now get the full 200 watts that the amp can put out.
Also be aware that if your amp is rated @ 100 watts x 2 @ 2 ohms then it can probably put out 200 x 2 @ 1 ohm. As long as it is 1 ohm stable. My crappy 250 watt jensen was 1 ohm stable, so I would assume the MTX series would be.
Read your instruction manual on how to bridge the amp. They are all different. The MTX I used to have, it was Right channel positive and left channel ground to bridge.
Originally posted by: minendo
Double the power to each channel.Originally posted by: Beast1284
ok, this site says they are 4 ohms, so what would it happen if I hooked up that amp? Just cut the rated power in half to each channel?
sigh. no. more resistance = less power. you get half the power per channel out of the amp with 4 ohm speakers as you do with 2 ohm speakers.
minendo, amps can't change the resistance you're using. that is defined by speakers and speakers alone.
evadman, these are 6x9's, not subwoofers. he's going to be running them in stereo, not a mono parallel setup. at least i assume that's what he's doing. anything else would be silly.
the short answer to Beast's question is using your MTX speakers with your Thunder amp will give you an output of 50 watts per channel, well below their rated capacity. so go for it.
Heh...that's why most wouldn't use that. You have to take the limit to get anything of substance...and as R approaches 0, I approaches infinity.
adul is right.....trust me or i will buy you new speakers
{errrrr did i say that?}...lol seriously....yer all set dudeOriginally posted by: minendo
Double the power to each channel.Originally posted by: Beast1284
ok, this site says they are 4 ohms, so what would it happen if I hooked up that amp? Just cut the rated power in half to each channel?
Have that backwards. It's cuts the power in half. And with Amps, you can never be toosure if half is accurate. You have to see what hte manufacturer says they do at 4 ohms.
You can hook up a 10000 watt amp to a 10 watt speaker and not fry it. It can be easily done, but as long as you don't turn the volume up too high, everything will be fine.
I have "200 watts" going into my front MB Quarts that are rated at 100 watts. Don't even come close to fryingthem.
Truth is, in my experience, that if you have a more powerful amp, there is less static in the speakers at higher volumes. Makes it sound much cleaner.
Sems to be confusion here:
Two formula you NEED TO KNOW:
P = IV
V = IR
P = power
I = current
V = volts
R = resistance.
Using these formulas, you should be able to figure out how different load will effect power output.
Two formula you NEED TO KNOW:
P = IV
V = IR
P = power
I = current
V = volts
R = resistance.
Using these formulas, you should be able to figure out how different load will effect power output.
K...simply put....ur amp puts out 50 x 2 at 4 ohms...or 100 x 2 at 2 ohms....or 200 x 1 at 4 ohms. It wont handle 2 ohm mono. So you can either hook up each speaker to each channel and each will get 50 watts. Or you can wire the two speakers in parallel and treat it as one big speaker and hook it up to one channel and each speaker will still see 50 watts. If you do that, you will still have one channel free.
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