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.

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Specifications

Noise Control	None
Headphones Jack	3.5 mm Jack
Model Name	HD 599
Connectivity Technology	Wired
Wireless Communication Technology	3.5 mm
Included Components	1.2 m cable/ 3.5 mm straight plug, 3m cable / 6.3 mm straight plug, 6.3 mm to 3.5 mm adapter, HD 599 headphones
Age Range (Description)	Adult
Material	Plastic Aluminum
Specific Uses For Product	Music
Compatible Devices	Cellphones, Gaming Consoles, Laptops, Music Production Equipment, Portable Media Player, Tablets
Cable Feature	Detachable
Item Weight	250 Grams
Water Resistance Level	Not Water Resistant
Customer Package Type	Standard Packaging
Net Quantity	1 Count
Style	HD 599 Wired
Control Method	Remote
Number of Items	1
Audio Driver Type	Dynamic Driver
Earpiece Shape	over_ear
Hardware Interface	3.5mm Audio
Input Device Interface	Audio jack
Supports Bluetooth Technology	No
Special Feature	Powered by proprietary Sennheiser 38mm, 50-ohm transducers
Global Trade Identification Number	04044155207576
Manufacturer	Sennheiser, Sonova Consumer Hearing India Pvt. Ltd, 510, 5th Floor. Time Tower. M. G. Road. Sector 28, 122002 Gurgaon, IN
Model	506831
Model Year	2016
Product Dimensions	20.57 x 10.03 x 26.04 cm; 250 g
Batteries	1 Lithium Ion batteries required.
Item model number	506831
Special Features	Powered by proprietary Sennheiser 38mm, 50-ohm transducers
Aspect Ratio	Unknown
Microphone format	without microphone
Speaker connectivity	Wired
Power Source	Battery
Batteries Included	No
Batteries Required	No
Battery cell composition	Lithium Polymer
Cable feature	Detachable
Device interface - primary	Buttons, Microphone
Does it contain liquid?	No
Includes Rechargeable Battery	No
Includes AC Adapter	No
Manufacturer	Sennheiser
Country of Origin	China
Imported By	Sennheiser Electronics India Pvt Ltd. 104-ABC, 1st Floor, Time Tower, M.G Road, Gurgaon-122002. Haryana.
Item Weight	250 g

HD 599 Open‑Back Audiophile Headphones, German-Irish Craftsmanship, Wide Soundstage, Detachable Cables, Ergonomic acoustic refinement design, Comfort-Fit for Gaming, 2‑Year Warranty

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