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Onkyo TX-NR515 receiver as headphone amp?

post #1 of 7
Thread Starter 

I just picked up a set of AKG Q 701 cans for watching TV/Movies/Games on my home theater (my neighbor is a dick and cries to the HOA).  I have an Onkyo TX-NR515 7.2ch receiver that I plan on hooking the 701's up to.  I cannot find any specs on the headphone jack for the receiver.  Does anybody know if this thing will be able to drive the 701's with no problems or am I going to have to buy another headphone amp?

 

Here is a link to the Onkyo page for the receiver - http://www.onkyousa.com/Products/model.php?m=TX-NR515&class=Receiver&source=prodClass


Edited by Airwolf - 3/11/14 at 10:30pm
post #2 of 7
Thread Starter 

Anybody?

post #3 of 7
Quote:
Originally Posted by Airwolf View Post
 

I just picked up a set of AKG Q 701 cans for watching TV/Movies/Games on my home theater (my neighbor is a dick and cries to the HOA).  I have an Onkyo TX-NR515 7.2ch receiver that I plan on hooking the 701's up to.  I cannot find any specs on the headphone jack for the receiver.  Does anybody know if this thing will be able to drive the 701's with no problems or am I going to have to buy another headphone amp?

 

Here is a link to the Onkyo page for the receiver - http://www.onkyousa.com/Products/model.php?m=TX-NR515&class=Receiver&source=prodClass

The Onkyo 515 receiver should have no problems driving the 62-Ohm AKG Q701 headphones.

post #4 of 7
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post
 

The Onkyo 515 receiver should have no problems driving the 62-Ohm AKG Q701 headphones.

 

Thanks for the reply.  I posted on the Onkyo forums asking for some specifications on the headphone jack, but I doubt I will get any response.

 

I will try the AKG's with the receiver and with my JDS O2.  I think you are right that it will have no problem...I just heard that the Q 701's are a little harder to drive and wanted to be sure I was doing them justice.

post #5 of 7
Quote:
Originally Posted by Airwolf View Post
 

Thanks for the reply.  I posted on the Onkyo forums asking for some specifications on the headphone jack, but I doubt I will get any response.

I will try the AKG's with the receiver and with my JDS O2.  I think you are right that it will have no problem...I just heard that the Q 701's are a little harder to drive and wanted to be sure I was doing them justice.

The Onkyo uses the same amplifier that it uses to drive the speakers to drive the headphone jack, so power is not a problem.

So headphones up to 300-Ohm should not be a problem for the Onkyo.

But chances are the Onkyo's headphone jack has a high impedance, so it might give the Q701's a slightly bloated bass (louder, less detail).

Where as the O2 has a very low impedance (>1-Ohm), so the O2 might make the Q701 sound a bit better.

But plugging the Q701's straight into the Onkyo is easier then try to hook an external headphone amplifier to the Onkyo.

 

I'm guessing the receiver's headphone specs are not published by the receiver manufacturers because there is nothing to brag about.

post #6 of 7
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post
 

The Onkyo uses the same amplifier that it uses to drive the speakers to drive the headphone jack, so power is not a problem.

So headphones up to 300-Ohm should not be a problem for the Onkyo.

But chances are the Onkyo's headphone jack has a high impedance, so it might give the Q701's a slightly bloated bass (louder, less detail).

Where as the O2 has a very low impedance (>1-Ohm), so the O2 might make the Q701 sound a bit better.

But plugging the Q701's straight into the Onkyo is easier then try to hook an external headphone amplifier to the Onkyo.

 

I'm guessing the receiver's headphone specs are not published by the receiver manufacturers because there is nothing to brag about.

 

Thank you for the detailed response.  I will chime in when the headphones come in Friday with my findings.

post #7 of 7
Thread Starter 

So I got the headphones and spent some time with them on both my JDS O2 and Onkyo TX-NR515 receiver.  The receiver can definitely drive them with no problems, as PurpleAngel said.  They were pretty flat when I first hooked them up and listened to some music on the receiver and found out that you cannot adjust the treble or bass on the receiver for headphones.  I am outputting to the receiver from an HTPC with a AMD Radeon HD 6570 via HDMI with audio being processed by the graphics card.  It didn't come with an equalizer, but after some digging, I found out that it uses a Realtek audio chipset and Realtek has an AMD HDMI audio driver on their website that can be used with the card.  I installed this and was able to EQ the headphones and now they sound fantastic.

 

If it weren't for this forum, I'd probably be using the same gawd-awful Sony wireless headphones, but now I can actually enjoy the sound coming from home entertainment center.


Edited by Airwolf - 3/15/14 at 3:40pm
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