How do these compare to the 598s?

The HD 599 is a cosmetic refresh of the the HD 598. Both uses the Sennheiser SYS38 50-ohm transducer.

How is the bass on these headphones? Does it effect the mids/highs at all?

While these aren't "bass head" headphones, they have noticeably more bass than their predecessor the HD 598s. I always found the HD 598s to be a little "bass light", where the HD 599s have a much richer sound. The HD 599's are more musical where the HD 598s are more analytical. Depending on the track and your listening level there may be some noticeable intermodulation distortion where the bass frequencies will distort the mids and highs. On Deadmau5's new track "Let Go" the effect is very noticeable when you turn them up (and not all that loud). Playing the same track on my HD 600s, HD 650s, and HD 700s does NOT result in this distortion. It isn't that the bass is distorting, it just interferes with the mids and highs. These HD 599s are my daily driver (at work) and I REALLY like them. They are a far more versatile than the HD 598s, they sound fantastic, and I don't regret the purchase at all. At work I run them on a Schiit Modi 2 Uber/Magni 2 Uber stack and the pairing with the HD 599s is excellent. The highs are also better on the HD 599s than the HD 598s (which struggled with "Sh" and "F" sounds).

Can you use these on a phone

Yes. I have an earlier version, the HD598SR. They are compatible with phones and computers, and the short cable has a built-in microphone which will allow you to use it on phone calls. The longer cable doesn’t.

Can any recommend an amp for these? i was thinking of getting the objective 2 but if anyone else has a better one please tell me. p.s. i'm on a budget

I powered the HD599s with my LG-G4 smartphone, an Acer Chromebook R-13 (excellent headphone section for a laptop), a Schiit Modi 2 Uber/ Vali 2 (Genalex Gold Lion 6922 tube) stack that I use at work (I also used a Schiit Magni 2 Uber with the Magni 2 Uber), and a Schiit Bifrost Multibit/Valhalla 2 (Genalex Gold Lion 6922 tubes)stack I have at home (I also used a Schiit Asgard 2 with the Bifrost). I did/do not apply any equalization or effects when I listen. Like all the higher end Sennheiser headphones, the HD599s improved noticeably as the driving components improved. After a lot of listening to the 598s and 599s I concluded that they both sounded best when run through my Bifrost/Asgard 2 stack (The Modi 2U/ Magni 2U pairing was also excellent), so this is how I listened when doing my analysis. Like most lower impedance headphones, they both seem to prefer solid state amps to OTL tube amps, but they did pair well with the Vali 2 (a hybrid tube amp) as well. I know the O2 is a brighter amp (and solid state) and would probably pair quite we with these.

ASIN	B01L1IICR2
Age Range (Description)	Adult
Audio Driver Type	Dynamic Driver
Batteries	1 Lithium Ion batteries required.
Best Sellers Rank	#4,310 in Electronics ( See Top 100 in Electronics ) #193 in Over-Ear Headphones
Cable Feature	Detachable
Cable Length	3 Meters
Compatible Devices	Music Production Equipment, Laptops, Desktops, Gaming Consoles, Tablets, Telephones, Smart Speaker, Television, Cellphones
Connectivity Technology	Wired
Control Method	Remote
Customer Reviews	4.6 4.6 out of 5 stars (9,928)
Date First Available	September 14, 2016
Earpiece Shape	Over Ear
Generation	500 series
Global Trade Identification Number	04044155207576
Hardware Interface	3.5mm Audio
Headphones Jack	3.5 mm Jack
Included Components	Cable, Ear Cushions
Input Device Interface	Audio jack
Is Discontinued By Manufacturer	No
Item Weight	8.8 ounces
Item model number	506831
Language	English, English, English, English, English
Manufacturer	Sennheiser
Material	Aluminum, Plastic
Model Name	HD 599
Noise Control	Sound Isolation
Number of Items	1
Special Feature	Lightweight, Noise Cancellation
Specific Uses For Product	Music
Style	HD 599
Supports Bluetooth Technology	No
Unit Count	1.0 Count
Water Resistance Level	Not Water Resistant
Wireless Communication Technology	Wired

Sennheiser HD 599 Around-Ear Open-Back Around Ear Headphone - Ivory Color & Matte Finish (Pack of 1), Wired

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