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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 233

post #3481 of 3489
Quote:
Originally Posted by hpandy View Post
 

I've read the bulk of this thread and I finally have a clear picture in my head of the different options.

 

My question is this: Why are the headpone outputs of integrated amps not already set up this way?  If it is so cheap and sounds so good, what is it that makes manufacturers do something different?

 

I opened up my arcam alpha 10 to take a look at the headpone socket, and all I see are 4 resistors.  Am I really doing anything different that what is already done inside the case by using the speakers taps?

 

The arcam alpha 10 is 100+ wpc in 8 ohms, can anyone guess as to how much attenuation I will need when driving a pair of audeze lcd-2?  Would it be safe to hook them up without?

 

(Additional none related query below)

 

 

Something that has been bugging me is that when people talk about the power requirements of headpones, they talk about the amount of power required to make a certain headphone reach a certain db.  Is this an average figure taken accross all frequencies, because I thought lower frequencies required more power? 

 

When somebody says x amount of power will produce y db output on these headphones, then in theory, could that not be true for the lower frequencies?

 

The reason I ask here is I wonder if this could be the reason that driving headphones from powerful speaker amps produces favourable results.

 

Cheers,

Andy

 

Hey Andy,

 

Built-in amplifier headphone jacks are usually over attenuated and drop the power to the headphone jack too much. This may be due to liability issues with damaged headphones or hearing. The resistors in your arcam alpha probably over attenuate. You could replace the built-in resistors to get the amount of attenuation you want.

 

You can safely connect your headphones to the speaker taps but slowly raise the volume so you don't overpower the headphones. As long as you don't have noise floor (hiss) or volume control issues you don't need a resistor network with a solid state amp (tube amps tend to be more sensitive to speaker load).

 

For 100watts per channel I would recommend about 24db of attenuation.


Edited by robrob - 4/10/14 at 9:50am
post #3482 of 3489
Quote:
Originally Posted by manbear View Post

Quote:
Originally Posted by hpandy View Post

Something that has been bugging me is that when people talk about the power requirements of headpones, they talk about the amount of power required to make a certain headphone reach a certain db.  Is this an average figure taken accross all frequencies, because I thought lower frequencies required more power? 

When somebody says x amount of power will produce y db output on these headphones, then in theory, could that not be true for the lower frequencies?

The reason I ask here is I wonder if this could be the reason that driving headphones from powerful speaker amps produces favourable results.

Cheers,
Andy


Sensitivity is usually measured relative to 1000 Hz. It will definitely vary across frequencies, and the variation depends on the headphone's impedance curve. As far as I know, many headphones have an impedance peak somewhere in the bass frequencies due to driver resonance, so that peak would require more power. 
It's the opposite, impedance tend to increase in the bass, meaning it requires less power.
Bass in lots of music tend to be fairly 'loud' compared to other sounds and instrument, but bass doesn't require more power per se, at least to reach a certain dB.
post #3483 of 3489

Thanks for the answers guys.

 

I've noticed that when I eq the bass significantly, music volume decreases when bass notes are present in a piece, and then increases when they are not.   Empirical evidence suggests that from an amplifiers perspective, bass frequencies are harder to drive.  I would like to see this represented in numbers.

 

I'm considering selling my DAC and one or two of my amps and buying a budget-mid cost receiver to function as an all in one headphone amp/dac.  Can anyone recommend any brands for relivable dac performance in receivers?

post #3484 of 3489

Somebody made some recommendations on receivers with DACs in the "Speaker amps for headphones" thread. There are some pretty sweet receivers out at pretty killer prices.

post #3485 of 3489

Still no word from brunk?

post #3486 of 3489
Quote:
Originally Posted by themad View Post
 

Still no word from brunk?

 

Nope

post #3487 of 3489
Quote:
Originally Posted by DaemonSire View Post

Nope
Same here. I hope he is ok and that he is so busy making the Robinette boxes that he does not have the time to respond now.
post #3488 of 3489

will the new he-560 responds the same way when paired with the mini-x? hopefully it will..

post #3489 of 3489
Quote:
Originally Posted by kothganesh View Post


Same here. I hope he is ok and that he is so busy making the Robinette boxes that he does not have the time to respond now.

Yes, let's hope that is the case...

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