Using headphones with a turntable

[hccard]

I am looking into getting the Audio Technica LP60:

http://www.audio-technica.com/cms/turntables/9a7f42b88ee1e14b/

 

To preface, I know very little about turntables or audio stuff in general. While this probably doesn't make a ton of sense in the context of a turntable setup, I prefer to listen to music with headphones almost exclusively. This being said, I have tried to do some research about what I'll need and have found inconclusive results. From what I understand, I should be able to directly plug my headphones (I have the Audio Technica AT-M40X) into the turntable with an RCA-to-Aux adapter and be able to listen right away. However, I would have no way to adjust volume with that method, and I'm also unsure if that would affect the quality of sound. So I've looked into getting a headphone amp, which would give me a way to control the volume, but apparently my headphones don't need an amp to work. Would a simple volume controller like this:

 

https://www.amazon.com/Koss-155954-VC20-Volume-Control/dp/B00001P4XH

 

give me the same result as an amp? Additionally, this is the amp I was looking into getting, should I go that route:

 

https://www.amazon.com/SMSL-sApII-TPA6120A2-Headphone-Amplifier/dp/B00J2PJQ0O

 

Any suggestions on what I should do/get would be greatly appreciated!

[spwath]

It looks like that turntable has a built in preamp, so that's good, but you will need an actuall amp for headphones.