Sennheiser HD 505: two-minute review
The new Sennheiser HD 505is a refresh of one of the cornerstones of its model ranges: entry-level, open-backed, hard-wired over-ear headphones. This new design uses a variation on a proven transducer, and makes pragmatic choices where materials are concerned to produce a headphone that’s light, comfortable and built to last.
The Sennheiser HD 505 are fine-sounding headphones in many ways, too. The open-backed element of the design of these headphones allows them to sound open and expansive, and they’re organized and authoritative too.
Their tonal balance is just somehow correct, their frequency response is judicious and they have the sort of dynamic headroom that allows the changes in volume or intensity in your favorite recordings to be completely apparent.
They’re far from the last word in bass heft or punch, though – so despite the amount of low-frequency detail they reveal and the naturalistic way they have with rhythms and tempos, there’s no doubt some listeners will want more, bass-wise, than the HD 505 are prepared to give.
Those listeners are invited to check out other options among the best wired headphones – and notably the company’s own HD 600, which have been around long enough to be available at regular discounts that bring them very close to the price of the HD 505.
The rest of us, though, can just go ahead and marvel at how open, revealing and, yes, entertaining the HD 505 sound.
Sennheiser HD 505 review: Price and release date
- Release date: February 10th 2025
- Price: $249 / £229 / AU$449
Obviously the HD 505 have had no time to become any more affordable, so they find themselves competing with the likes of Beyerdynamic (with its DT 900 Pro X) and Grado (with its SR325x). They also, rather unfortunately, find themselves competing with their HD 600 siblings, which have had plenty of time to come down from their £399 launch price to something much closer to HD 505 money…
Sennheiser HD 505 review: Specs
Sennheiser HD 505 review: Features
- 38mm dynamic drivers
- 1.8m cable with 3.5mm/6.3mm termination
- 120Ω nominal impedance
Given that this is a fairly affordable pair of wired over-ear headphones, you shouldn’t really expect a whole host of features – and, sure enough, the HD 505 focus on the essentials. That doesn’t mean that those features aren’t entirely fit for purpose, though.
Sennheiser has drawn on the relatively long-serving 500-series transducer in an effort to maintain sonic transparency, but added a little low-end heft and substance. And the result, so it says, is that the 38mm dynamic driver design is now good for a frequency response of 12Hz - 39kHz – which in layman’s terms is ‘extremely deep’ to ‘very high indeed’.
A nominal impedance of 120Ω isn’t the most promising number you ever heard, but nevertheless the HD 505 won’t be difficult for all but the most weedy smartphone or laptop to drive.
And really, there’s only the cable left to discuss where ‘features’ are concerned. The left earcup is hard-wired with a 2.5mm jack that connects via a ‘twist and lock’ method that ensure it won't be yanked out.
At the other end of the 1.8m cable there’s a 3.5mm termination with a screw-on 6.3mm adapter supplied. It would have been nice to see a balanced cable as an option too, but I guess you can’t have everything…
- Features score: 4.5 / 5
Sennheiser HD 505 review: Sound quality
- Detailed, dynamic and direct sound
- Spacious, organized presentation
- Will not satisfy bass-fanciers
The pluses, it’s fair to say, comfortably outweigh the minuses where the sound of the HD 505 is concerned. So while the deficiencies are not insignificant, it seems only polite with all the many things these Sennheiser cans get right.
Thanks in no small part to their open-backed configuration, the HD 505 are an expansive, wide-open listen – and they can control a soundstage just as confidently as they lay it out in the first place. Even in a recording with lots going on (Fela Kuti’s Colonial Mentality, for instance), the soundstage is properly defined and easy to follow.
Every element of the recording has a pocket of space to itself in which it can spread out and express itself, and the spaces in between are given the weighting and emphasis they deserve too.
They’re a fairly dynamic listen, too, able to put a lot of distance between the most contemplative and the most intense passages of a recording without sounding in any way stressed. They’re just as skilful when it comes to handling the dynamic aspects of harmonic variation, too – the moments of unaccompanied bass guitar during the Fela Kuti tune have their fluctuations described in eloquent fashion.
Tonality is pleasantly neutral, which allows the sound of a recording to take precedence over the sound of the headphones. Detail levels are high at every point of the frequency range – the top end is bright but substantial, and enjoys just as much variation as the swift, properly controlled bottom end.
In between, voices are given the space and the positivity to reveal the minutiae of their character and technique – a listen to Doechii’s Alligator Bites Never Heal lets you know the HD 505 are very adept indeed when it comes to allowing vocalists to properly express themselves.
The frequency range is handled with confidence, too – nothing is underrepresented, nothing is overstated, and the sweep from bottom to top and back again is smooth. But it’s at the bottom of the frequency range that the Sennheiser reveal themselves to be slightly less than the finished article.
The control of bass sounds is straight-edged and direct, so the headphones have no problem describing rhythms in a natural and unforced manner. Detail levels here, and tonal variation, are just as satisfying as they are elsewhere in the frequency range.
But there’s a definite lack of substance and weight to the bottom end, a bony and flimsy quality that is going to disappoint listeners who are used to (and probably expect) something approaching ‘punch’ from their new headphones. Certainly the Doechii album is done no favours whatsoever by this flyweight attitude.
- Sound quality score: 4 / 5
Sennheiser HD 505 review: Design
- Covered memory foam at the contact points
- Steel mesh earcup coverings
- Concealed headband adjustment mechanism
There’s nothing especially luxurious about the Sennheiser HD 505 – they’re mostly made of plastic – but they’re built and finished to the sort of high standard the brand established ages ago.
Without the cable, they weigh just 237g, and allied to some nicely judged clamping force they prove a comfortable proposition even for longer listens. The amount of memory foam that makes up the inside of the headband (where it’s covered in synthetic leather) and the earpads (which are covered with synthetic velour) doesn’t do any harm in this respect, either.
The headband adjustment mechanism is concealed inside the headband itself, and operates with a sort of clicky positivity. The rear of the earcups is covered with a quantity of metal mesh, and carries some understated branding – but as design flourishes go, that’s going to have to do.
The details in the majority of the world are in a nice copper color – in China, there's a model with gold-colored details that certainly provides more bling.
- Design score: 4.5 / 5
Sennheiser HD 505 review: Value
- Informative, entertaining but slightly lightweight sound
- Properly built and finished, although far from tactile
- Light and comfortable
In truth, the HD 505 aren’t much to look at, and they’re not exactly tactile either. This doesn’t mean that they’re not properly built, you understand, or that they won’t last for the long haul – and there’s always the cachet of that brand name to add to your the pride of ownership.
Add in the trim weight of the headphones and, even more so, the deftly accomplished sound they make, and there’s unarguable value for your money on offer here.
However, as I mentioned further up, you can get the Sennheiser HD 600, which are the 'step-up' versions of these headphones, for very close to the same price as these in the real world. So it's hard to say the HD 505 are the bargain of the century when the HD 600 might actually qualify for that moniker.
- Value score: 4 / 5
Should I buy the Sennheiser HD 505?
Buy them if…
Don't buy them if…
Sennheiser HD 505 review: Also consider
How I tested Sennheiser HD 505
- Connected to a FiiO M15S, to an Apple MacBook Pro and to a Naim Uniti Star
- With a lot of different types of music, from a number of different formats
- Alone, of course, because to do otherwise would be rude
‘Quiet time’ is necessary to listen to the Sennheiser HD 505, if for no other reason than they let a distracting amount of sound leak out of the back of their earcups, as all open-back cans do.
So I sat at my desk with them attached to my laptop and to my digital audio player (via its unbalanced output, tragically) and sat rather more comfortably with the headphones attached to a network streamer that also preamplified a turntable and a CD player.
So lots of different formats were available, as were lots of different types of music – and a week of this (on and off) was long enough to learn all there is to know about these headphones.
First reviewed: March 2025
