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Sennheiser HD25 Plus Monitoring Headphones

Sennheiser HD25-1 II Pro Monitoring Headphones

Model: HD 25-1 II

Sennheiser HD25-1 II Pro Monitoring Headphones
  • No Longer Available at 
  • (1 review)
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About: Sennheiser HD25-1 II Pro Monitoring Headphones

The closed-back HD 25-1 IIs are purpose-designed, professional monitoring headphones offering high attenuation of background noise. Capable of handling very high sound pressure levels and of extremely robust construction, these headphones perform exceptionally well in high-noise environments, e.g. ENG, sound reinforcement, studio monitoring and audio equipment testing. The capsule is rotatable for one-ear listening. Ideal monitoring headphones for cameramen and DJs.


  • Very lightweight and comfortable, even if used for long periods
  • High maximum sound pressure level
  • 65 .nominal impedance for universal compatibility
  • Tough, detachable steel cable
  • Neodymium ferrous magnet systems and lightweight aluminium/copper voice

Delivery Includes

  • 1 HD 25-1 II
  • 1 Bag
  • Soft ear pads (1 pair)
  • 1 adaptor to ¼” (6.3 mm) stereo jack plug


Technical Data

Ear coupling: supraaural
Transducer principle: dynamic, closed
Nominal impedance: 70 Ω
Frequency response (headphones): 16 - 22000 Hz
Max. Sound pressure level (aktiv): 120 dB SPL
Load rating: 200 mW
THD, total harmonic distortion: < 0,3 %
Contact pressure ca.: 2.5 N
Jack plug: 3,5/6,3 mm stereo
Cable length: 1,5 m
Weight w/o cable ca.: 140 g

UPC: 615104135703 is a Canadian authorized Sennheiser retailer.

Reviews: Sennheiser HD25-1 II Pro Monitoring Headphones

Calvin I. - 06/27/2014

-Highs are extremely clear, does not pierce the ears.
-Mids (voices, and certain instruments) are not drowned out, and stand fully on their own.
-Bass expression is good, not drowning out anything else, very controlled and reigned in.
-Price is reasonable, but it’s more than i’ve ever spent on any other pair of headphones before
-Velour ear pads come in the box
-¼” Adapter screws on and is extremely rugged, I use it as a protective cap for the ⅛”
the screw portion of the ⅛” is small enough to be compatible with my iPhone 5 w/ OtterBox Commuter case on.
-Replacement cable is available and user replaceable
-Durable, 2 weeks in my bag, still looks like the day I was handed them.
-Sounds good “soon” out of the box, minimal tuning required (see “Headphone Burn-In phenomenon” in the Cons section)
-Good clamping pressure, not too much, not so little they fall off. (given they are properly adjusted to your head)
Plastic construction (details in other thoughts)
-Simple, easy to open cardboard box, no frills, if you're buying this, you know what you're getting.

-You can’t listen to other people’s headphones after this, you’ll be too tempted to insult them on how bass heavy, or mid-missing the sound is.
-The installation of the ear pads is not clear, and no instructions are provided, for a $275 pair, you could at least throw a small slip of paper in the box explaining it, I almost ruined the plastic-leather ones if I didn’t google how to take them off.
-Storage bag is too small, if the headphones are in any position other than their smallest size, they are not coming out adjusted as they went in.
-Headphone Burn-In phenomenon, more on this in other thoughts
-Right earcup is not rotatable, I really wish it was because when you have them on, people approach you from BOTH sides.
-The only way you can tell right from left (when you first get them) is the little red connector attaching the cable to the driver.
-They look very minimalistic, which is perfect for me being the sound guy in the booth, or sitting at my desk studying, but if you’re going to be on stage live in front of an audience, and care more for looks then functionality or sound quality, then go find something else.
-No microphone. Coming from my Roccat Kulo headset, these are quite similar, not having the mic is something I often forget.
-Clamping pressure is high, causes discomfort on the top of the ears after hours of continuous use
-Not as sealed as I’d have thought (Could just be Velour pads)

When I first got these, they sounded like rubbish, now two weeks later, every other pair of headphones sounds like rubbish. Not a single person who has heard my headphones has said anything bad about them. There is a phenomenon called “Headphone Burn-in”; you’ll hear this A LOT about this headset, but it’s true, the first song you throw through these (in my case Simple Plan - Jet Lag) will sound HORRIBLE! Murkier than if you were listening underwater, but give it 5-6 minutes of music (on my pair, results may vary) and they suddenly became the best headphones I’d ever worn, my phone hit Alesso - Years and the sweep at about 7 seconds in, it put the gasm in ear-gasm. The accuracy of sound reproduction makes these the idea headphones for live audio mixing as: Theres no interface that causes delay, what you hear out of the headphones is what comes out of the speakers - sometimes before. The velour earpads (expectantly) leak out more than the pleather ones; the drivers themselves leak out the back somewhere near the mounting hinges though.

The headphones are constructed entirely out of plastic, save for hinge pegs, side screws and connector. That in mind, don’t take these “Made in Ireland” headphones for fragile or cheap. I’ve had them crushed in my laptop bag under a G750JX laptop (4.5KG + whatever else was in the bag) because my mom put it in the car the wrong way. In fact the first day of use they were outside in a damp field for an outdoor concert experience. Not one of the 3 people on the soundboard other than me complained about them at all. In fact, their “Cheap-looking” nature allowed me to just leave them out in the middle of an open desk and no-one taking them. In the future I might add a AntLion ModMic 4.0 to make up for the lack of a microphone.

For the two reviews that helped my make my decision, look for reviews from Head-fi and UrAvgConsumer on YouTube.

Bottom Line:
Yes, I would recommend this to a friend

Warranty: Sennheiser HD25-1 II Pro Monitoring Headphones Warranty:

30 Days

Manufacturer's Warranty:

Sennheiser : 2 years
Sennheiser Evolution Series: 10 years
Sennheiser Aviation Series: 5 years
Neumann : 1 year
Klein & Hummel : 2 years

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