ohms - Page 2

Quote:

Originally Posted by Head Injury 

Current is measured in amperes, so no. High impedance takes more voltage, less current, same power if the sensitivity stays the same.

 

I'm gonna throw some numbers at you, get ready to duck. They're equations to relate power to voltage and current.

 

To find power (in watts, labeled P) from voltage (in volts, labeled V) and current (in amperes (I think whole amperes), labeled I for some reason), you do this:

 

P = I x V

 

To find power from voltage and impedance (R), you do this:

 

P = V^2 / R

 

To find power from current and impedance, you do this:

 

P = I^2 x R

 

So as might be able to see, as impedance increases, voltage must increase to achieve the same amount of power, and current must decrease to achieve the same amount of power. Because it's the headphone's sensitivity that determines how loud it gets with a given amount of power and not the impedance, as impedance increases and sensitivity stays the same voltage must increase, and current must decrease.

 

I can throw numbers in there so it looks less alien, if you need it.

this is true if you think about electricity as electrons.

the coil is only willing to accept a certain amount of electrons.

if you group those electrons into large groups, they are called amperes.

if you group those electrons into small groups, they are called voltage.

the above post is intuitive to say 'sensitivity and RMS value determine how many electrons can be transferred'

how many of those need to be in small groups is determined by the ohm rating.

(more) cleaner, faster voltage = lower harmonic distortion

(more) cleaner, faster amperes = higher signal to noise ratio

check this..

my receiver has a total harmonic distortion of 0.9% when i have it set to surround sound mode.

and when i set it to stereo output, the total harmonic distortion drops to 0.07%

quite honestly..

i just changed my connection method yesterday, and let me reassure you.. the difference is very audible.

all of that crap i was saying about the xb500 headphones.. well i just added another order of harmonics by lowering the total harmonic distortion.

i swear..

the chunks of data information coming out of the headphones proceed with OBVIOUS more voltage.

it sounds 'more functionally active' now.

the bass has higher dynamics.. the midrange has higher dynamics.. and even the treble has higher dynamics.

dynamics are the difference between the low volume sounds and the high volume sounds.

when a person sings.. sometimes they sing with the same mono tone.

but

sometimes people sing and their voice goes up and down.

okay..

even if they are singing mono tone, if you zoom in and listen.. there are rises and falls in their words because of SYLLABLES .. and switching my receiver down to stereo mode has really shown the extra rises and falls in the mono tone (and multi tone) soundwaves with the XB500.

these headphones went from generic 'almost' to a serious gift for beginning audiophiles.

i can now recommend these headphones for the wicked details in digital sounds for electronic music.

before, some of those digital details were simply slurred or non-existant.

these headphones are happy to be tickled.. and they sound good with screaming growls from death metal too.

there are rises and falls in the voice when screaming like that. and they are there.

rap, pop, electronic, classic rock.. i wonder if the headphones can sound any better with an lower harmonic distortion.

and i wonder if i am hitting the limits of the sample rate and bit-depth of the music i am listening to.

of course, i am using my x-fi elite pro with the equalizer settings i posted on this forum.

i dont know what the rest of you goofballs are doing.

these headphones sound better than ANYTHING those high school DJ's of the 1990's could ever dream of.

i dont believe they make PA speakers that sound this good even today.

if you want something that sounds like this.. be prepared to use many line drivers and lots of small amps for each pair of midranges.

chances are.. you'll be stuck with 6.5 inch or 8 inch midrange woofers ... and you are gonna need five of them per speaker cabinet.

that means five amplifiers for the midrange only.

hard as hell to split a preamp single five times without running into an output resistance problem from the preamp.

gotta learn your line driver setup.. probably works like a tournament schedule structure.

3-5 tweeters

5 midranges

5 woofers

and you cant find a DJ subwoofer as accurate as the bass in these headphones.

16 amplifiers later.. you realize spinning for 5 hours is NOT LONG ENOUGH..!

these headphones bring embarassment & shame, and it isnt a mirrored image.

most times.. the microphone gets in the way when trying to recreate realism.

whether that be nuances and harmonics, or simple frequency response accuracy.

if you take anything from this post, let it be your harmonic distortion percentage.

i knew i could hear the difference in my floor standing speakers when i switched from surround sound to stereo mode.

the headphones gave me something of proof.

that means the harmonic distortion of these drivers are lower than 0.07% (my floor speakers too).

but

the x-fi elite pro has a total harmonic distortion of ....

well, one website says 0.004%

another website says 0.0008%

perhaps one of those is harmonic distortion of soundwaves.. and the other is the distortion of those uber awesome stereo panning effects (the microwaving i was talking about).

the smaller the stereo pan effect.. the less and less it is viewed as a harmonic, and the more it leans towards the term 'noise'

but too big to be called a nuance.

listening to a person talk.. and being able to tell they've got something in their mouth while talking = nuance.

the XB500 are close to nuances.. while the philips oneil headphones i tried at bestbuy the same day, those philips were an instant turnoff because they had harmonic distortion.. i didnt stick around to listen if they could make it CLEARLY past the harmonics and reveal the nuances.

put the xb500's on and instantly heard the clarity improvement.

stood around listening to hear how low that clarity went, and as it turns out.. i was listening to the distortion of the digital analog convertor on the bestbuy employee's cellphone.

i've added a 16ft extension cord.. and a 1/4th inch to 3.5mm adaptor to the line running to the headphones.. and they still sound better at home than they did at the store.

BUT

that only goes to prove how bad the other headphones are.

trying to listen to the audio. and instead of smooth soundwaves.. they've got ridges like a ruffles potato chip.

if you've got some expensive headphones that sound like there is ruffles on the soundwaves.. consider a new amplifier.

more amplifier power can get rid of those ruffles.

question is..

what is it going to take to get rid of those ruffles?

is it more amperes, more voltage, or faster output of amperes and/or voltage ?

how fast the amperes or voltage comes out of the amplifier is like packet size for the internet.

specifically, the MTU size.

if the MTU size is too small.. a bigger one might smooth out the ruffles.

but

sometimes, a smaller one is a mis-match with the cone.

it is ultimately best to match the MTU output size with the resonant frequency (or completely far away from that frequency) to get the best sound from the speaker.

So lets see if I understand... I am looking at 2 amps.  One pushes 50 ohms and the other pushes 8ohms (meant to push speakers).  Between the both the 8ohm is a smaller "pipe" to push a stronger current?  And the 50ohm is a wider "pipe" for a not so strong current.  SO...to run a high end phone the 8ohm would be better for less distortion?  

Speaker amplifiers usually have more than enough voltage and current to drive just about any dynamic headphone, and they have low output impedance as well. However, driving a headphone directly from a speaker output (with an adapter) is still not the best idea, since these tend to have a higher noise floor than that of a dedicated headphone amplifier.

Well this amp has a HP out.  The specs aren't available for the amp because it hadn't been released yet.  Noise floor?
 

Quote:

Originally Posted by stv014 

Speaker amplifiers usually have more than enough voltage and current to drive just about any dynamic headphone, and they have low output impedance as well. However, driving a headphone directly from a speaker output (with an adapter) is still not the best idea, since these tend to have a higher noise floor than that of a dedicated headphone amplifier.