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Yamaha P-515
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No, not really. They're easier to drive than the HD660's which are Sennheiser's answer to audiophile headphones that don't need an amp like the HD650s. They might sound a little better with an amp, depending on what's driving them, but if you're using a VST or your computer for audio, I'd go for a DAC before I went for an amp with those headphones.

My AKG K712 are in a similar spec range. They sound good when powered by my DP or my iPhone/iPad, but they do fill out and sound a little better with more power.

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Originally Posted by Joe Garfield
No, not really. They're easier to drive than the HD660's which are Sennheiser's answer to audiophile headphones that don't need an amp like the HD650s. They might sound a little better with an amp, depending on what's driving them, but if you're using a VST or your computer for audio, I'd go for a DAC before I went for an amp with those headphones.

My AKG K712 are in a similar spec range. They sound good when powered by my DP or my iPhone/iPad, but they do fill out and sound a little better with more power.

Thanks.

What's a DAC and which one do you recommend?


Yamaha P-515
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A DAC (Digital to Analog Converter) is an electronic device that converts the digital representation (discrete numbers) of sound to the electrical analog (continuous wave) representation of the same, before it gets amplified and transformed into audible sound by a transducer (loudspeaker or headphone).

You probably already have several (in your digital piano, or in your phone, in your TV set etc.).

I your situation, I believe you don't need a separate one.

Last edited by Erard; 09/08/21 03:22 AM.

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An external DAC is the entry way to the rabbit hole of "spending money to hear the sound of air."

You don't need one.

But if you want one, these are very good - not just very good for the price, but actually very good:
https://hifimediy.com/product/sabre-9018-uae23hd-usb-dac/

I recommend not going down that rabbit hole - save your money and sanity. But if you decide to take the plunge, send me a PM. I've played with a lot of hi-fi audio equipment over the past few years, mostly for DP usage, and am happy to share what I've learned to save you money and headaches.

Last edited by Joe Garfield; 09/08/21 04:03 AM.
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@Joe Garfield : your point makes me remember the Audio Myths Workshop where they copy a piece of music multiple times through a DAC / ADC of a usual PC soundcard. Despite of the multiple loopbacks, the degradation is barely audible.


Last edited by Frédéric L; 09/08/21 05:16 AM.

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No DAC needed here.

You should just be able to plug your Sennheiser headphones directly into one of the P515 6.3mm (1/4") headphone ports. Done. I just now tried this with my P515 and my Sennheiser HD800S headphones that I use on my big audio rig in my listening room - they just work. As do the Shure SRH1840 headphones that I usually use.

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If OP is using a P515 I would expect it to have plenty of capability to drive those headphones straight out of the jack.

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Fwiw, I have the HD650s and have never needed a headphone amp for the Yamaha CP5, CP4, CP88 or my AvantGrand N3X. I haven't used the P-515 but have one on order.


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