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Right now I'm using onboard sound. I wouldn't be against upgrading however. My current motherboard has the Realtek ALC889 chipset. I'll stay on the lookout for these two headphones. Any amplifier in particular that you would recommend if I went that route?
For single tube headphone amplifier.
I think Indeed is best, there are on their third generation (G3) design.
The only G3 model they sell is a headphone amp with preamp, which is over $100
Indeed has a slightly better chip (IRF510) for treble, starting with the G2, most other use a IRF630.
Also Indeed has a delay built in to their amps (G3), the headphones do not pop when the unit is turned on.
But other makers are also recently installing that feature.
The EH 6922 tube seems to be the best, and also the most expensive tube.
My Indeed 6922 ($88) stopped working after less then to months.
It had been moving from house to house, lose in a box, so it might be my fault.
Thought it was a defective AC power adapter, ordered another one for $18, 10 days to ship from China.
Turned out it was not the AC adapter (6922 tube tested ok), so I'm out $115.
So, I would say go for a cheaper one (different brand?) that has that power up delay built in.
You can save a few dollars if you go after the ones up for "Biding", not "Buy It Now"
and your not picky about which model tube they use.
Name brand resistors, capacitors to me are a plus.
and they have at least gone though one revision on their design,
like made the PCB has been redesigned.
Now also for around $20 (after $10 mail in rebate), you can just get the Asus Xonar DG (PCI) sound card.
The built in headphone amplifier is rated up to 150-Ohms.
It comes with Dolby Digital (headphone) 5.1, which is great for DVD movies, and helps in some games.
Sennheiser HD-558 headphone is rated at 50-Ohms.
So Sennheiser HD-558 and Asus Xonar DG, total $160 to $180