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Hifiman HE-4 Impressions Thread - Page 78

post #1156 of 3073

I have a general question regarding the powering of inefficient headphones. This may not be the best place to ask it, but since i am an HE-4 owner, i figure its close enough.

 

Anyway, i have been powering my HE-4 with a Burson HA-160. It gets me to listening volumes at a little past 9 o'clock, and i am happy with the sound quality. But does this mean i am powering the headphone correctly? More specifically, does getting my HE-4 to listening volumes without cranking my amp mean that i am providing the headphone with adequate power?

post #1157 of 3073

As long as your amp is operating within its current limits, you are getting the exact same power, voltage, and current that you would be getting if you listened at the same volume through 1,000 watt monoblocks, or anything else for that matter. 

post #1158 of 3073

Yeah, but to get full dynamic range your amp has to be able to deliver enough power

post #1159 of 3073
Quote:
Originally Posted by manbear View Post
 

As long as your amp is operating within its current limits, you are getting the exact same power, voltage, and current that you would be getting if you listened at the same volume through 1,000 watt monoblocks, or anything else for that matter. 

 

Thanks for the info, thats what i was thinking. I hear so much about amps not powering these guys fully, but maybe i just listen quiet. I was also worried that maybe i dont listen loud enough to make the headphone sound as good as it can.

post #1160 of 3073
Quote:
Originally Posted by kchapdaily View Post
 

I have a general question regarding the powering of inefficient headphones. This may not be the best place to ask it, but since i am an HE-4 owner, i figure its close enough.

 

Anyway, i have been powering my HE-4 with a Burson HA-160. It gets me to listening volumes at a little past 9 o'clock, and i am happy with the sound quality. But does this mean i am powering the headphone correctly? More specifically, does getting my HE-4 to listening volumes without cranking my amp mean that i am providing the headphone with adequate power?

If you can get the headphones to comfortable listening levels, you have enough power.

 

Quote:
Originally Posted by manbear View Post
 

As long as your amp is operating within its current limits, you are getting the exact same power, voltage, and current that you would be getting if you listened at the same volume through 1,000 watt monoblocks, or anything else for that matter. 

Is this true? I was under the impression that power is constant and that the pot/knob affects voltage (and, in turn, current).


Edited by Thujone - 1/10/14 at 3:24pm
post #1161 of 3073
Quote:
Originally Posted by Thujone View Post
 

Is this true? I was under the impression that power is constant and that the pot/knob affects voltage.


The knob controls voltage, yes. Voltage affects the power through the headphones according to Ohm's law, P = V^2 /R. V is the voltage you get at a given volume setting, and R is the impedance of the headphones. So power changes as you move the volume knob, which adjusts voltage. The power ratings for amps are maximum limits. I.e. what you get with the volume all the way up. 

IMO it makes more sense to think of amps as providing a maximum voltage instead of a maximum power, because voltage is what you actually control with the knob. The impedance of the headphones decides how much power you get at that voltage. This also explains why amps put different amounts of power into difference impedances. 

post #1162 of 3073
Quote:
Originally Posted by manbear View Post
 


The knob controls voltage, yes. Voltage affects the power through the headphones according to Ohm's law, P = V^2 /R. V is the voltage you get at a given volume setting, and R is the impedance of the headphones. So power changes as you move the volume knob, which adjusts voltage. The power ratings for amps are maximum limits. I.e. what you get with the volume all the way up. 

IMO it makes more sense to think of amps as providing a maximum voltage instead of a maximum power, because voltage is what you actually control with the knob. The impedance of the headphones decides how much power you get at that voltage. This also explains why amps put different amounts of power into difference impedances. 

I was thinking along the lines of P=IV for some reason. Current is constant then? It seems, based on this assessment, that the whole "you need more power" bandwagon is completely BS. 

post #1163 of 3073
Quote:
Originally Posted by TooPoor View Post
 

 I'm very interested in getting HE-4's, but I was wondering if my (new) M Stage HPA-2 (USB) has enough juice for them? Or, rather, has anyone heard this setup yet?

Not enough IMO.

post #1164 of 3073
Quote:
Originally Posted by Thujone View Post
 

I was thinking along the lines of P=IV for some reason. Current is constant then? It seems, based on this assessment, that the whole "you need more power" bandwagon is completely BS. 

 

Current isn't necessarily constant, but it is the load (the headphone in this case) not the amplifier that dictates the current draw. In this case current is not constant.

 

I have also been skeptical of the "orthos need gobs of power" thing. I have used a Starving Student (19J6), a PPA, and a Burson HA-160 and all have powered my HE-4 sufficiently.

post #1165 of 3073
Right. Current is constant for the load. Okay, that makes sense. The pot changes voltage and therefore power. I just got my mind in a twist for some reason... Thanks, guys!

beerchug.gif
post #1166 of 3073
Quote:
Originally Posted by Thujone View Post

 It seems, based on this assessment, that the whole "you need more power" bandwagon is completely BS. 


Yep. As long as an amp isn't clipping or distorting at volumes you want to listen to, you're probably good on power. A little extra never hurts for high dynamic range music, but I agree that power requirements are often overstated. Especially for the more sensitive orthos. 

post #1167 of 3073
Quote:
Originally Posted by MattTCG View Post
 

Not enough IMO.


 Yeah, after some research, I agree. Going to hold out and see how the 400i and 560 sound. The M-Stage shouldn't have issues with either, correct?

post #1168 of 3073
Quote:
Originally Posted by TooPoor View Post
 


 Yeah, after some research, I agree. Going to hold out and see how the 400i and 560 sound. The M-Stage shouldn't have issues with either, correct?

Correct.

post #1169 of 3073

3 projects accomplished so far tonight, 1. drink I.P.A, , 2. finish emotiva hp jack, 3. finish he4 re grill with felt removal. Well, i finished early, does that mean i get to drink more? Ya, i think it does.

 

post #1170 of 3073
Quote:
Originally Posted by hemipowered007 View Post
 

3 projects accomplished so far tonight, 1. drink I.P.A, , 2. finish emotiva hp jack, 3. finish he4 re grill with felt removal. Well, i finished early, does that mean i get to drink more? Ya, i think it does.

 

Oh, man. Looking good!

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