How to use headphones with separates

What I am having trouble understanding is that if I had “saved money” by buying an integrated amp, this would not be an issue.  Why?

Some stereo preamps and integrated amps have headphone amps built in and some don’t (separate amps don’t have headphone jacks), so you could’ve bought an integrated amp without a built-in headphone amp and still been in the same position you’re in now. Generally speaking, headphone amps built into preamps and integrated amps are not very high quality, underpowered, and often just an afterthought, so if you’re at all concerned with performance and/or have good headphones you’ll likely want a separate headphone amp. Hope this helps.

Buy a Headphone Amplifier, Schiit has some very nice and inexpensive HP Amps. 

  https://www.schiit.com/products/midgard

yes, long ago it seems all Preamps and Integrateds had headphone amps built in...for the most part, most built-in ones now are really just for the casual headphone user...the Belles Aria Preamps and Integrated Amps have high quality ones, really depends on your headphone needs...

As usual in audio rules had many exceptions...

I tried to upgrade for my K340 from my integrated 100 watts Sansui alpha... I buy one of the best tubes amplifier dedicated for headphone there is...

There was more apparently at first 15 minutes with this tube headphone amp. more details and there was certainly more silent background noise for sure even if the Sansui was very low noise already ...

But there is many acoustic factors in sound... Almost none were better on the upgraded celebrated headphone amplifier ... SYNERGY matter more than any rule...With the Sansui the K340 are stellar top heaphone ... With the upgraded headphone tube amp : artificial headphone timbre sound , no more out of the head impression and no 3-D holography with a natural realistic speaker like sound ...

I returned for a refund where i lost much money ( post fees customs insurance for import and export shipment ) ....😊

My K340 is so picky almost no headphone amp will serve them better that the Sansui alpha paid 300 bucks 8 years ago ...

Then if you had "an headphone out" from a vintage top flagship amp. of many decade ago and if you are stunned by the sound dont "upgrade" ...😁

My actual modified active  speakers alimented by the right dac in their acoustic corner are low cost and beat most headphones easily in nearfield listening ... My k340 beat them in all aspects and are my dedicated system for dedicated listening... My astonishing small speakers are for casual listenings many hours each day...

my system value is 700 bucks... I am proud of it as many others are proud of their costlier system... In a race for quality i am no so much far behind that what most people think ...

my headphone and their amp is vintage flagship of yesterday but yet always top product among today offerings ... Not the best there is... The best in the ratio price /S.Q. scale ...

Then some headphone out can beat dedicated amplification ...