Product test
Denon PerL Pro tested: ear measurement for perfect sound
by Florian Bodoky
OpenRock Pro review – protects your ears, perfect for sleeping
2/8/2023
Translation: Veronica Bielawski
The OpenRock Pro seemed like a niche product to me with no real use case. I was wrong. But the majority of people still won’t buy these earphones.
The OpenRock Pro are sports headphones with an open design. The advantage of this design is that you can hear your surroundings even while listening to music. In addition, the speaker is located in front of the ear and doesn’t have to be inserted into the ear canal, which should improve wearing comfort.
First impressions: big and heavy, but surprisingly comfortable
«What in the world...?» I think to myself as I unpack OpenRock Pro by OneOdio. I’m greeted by an almost fist-sized plastic charging case – oval, just under ten centimetres tall and weighing a whopping 90 grammes with both earpieces in. It creates quite the bulge in your pocket.
It takes me a second to figure out how to open the case. It snaps open vertically. But the surprises don’t end there; the huge, partially rubberised, rounded headphones frankly don’t look like they belong on your ears. The way they’re shaped, a completely different orifice comes to mind for inserting the OpenRock Pro.
The massive case is meant to store the rather large earphones in a reasonably space-saving way and, of course, to charge them. Despite the somewhat slapdash hinge, the case feels stable. You probably wouldn’t have to worry about your Openrock Pro headphones breaking if you drop the case. There are no bells and whistles that could break; just a USB-C port for charging and a button for pairing.
I find the OpenRock Pro really comfortable. Tipping the scales at 13 grammes per earpiece, they’re much lighter than they look. That’s also why they stay put on my ear better than I’d feared. To get an even closer fit, you can bend the rubberised part of the headband. As for the aesthetics of the OpenRock Pro, they take some getting used to. But there’s no accounting for taste.
What is TubeBass technology – and how does it sound?
The headphones each contain a 16.2 mm driver and the so-called TubeBass Technology. With it, OneOdio promises that the headphones offer more bass and more powerful sound than competing devices. Mind you, that’s not saying much, as open design on-ear headphones are rare.
I can hear that the headphones are at their core designed to be worn during physical activities – for so-called pumping music, or music meant to pump you up. Correspondingly, the lows on Cosmic Order, an electronic, very bass-heavy song, are dominant and powerful. The mids are quite soft. They don’t sound bad, but often lose the battle against the bass. This is somewhat to the detriment of the vocals.
On the other hand, the trebles are clearly more audible. This is particularly evident in Tchaikovsky’s Piano Concerto, where high-frequency sounds are reproduced clearly and without distortion. I don’t hear any distortion or cracking. Now, we’re not talking about the same brilliance as you get from Sony’s WF-1000 XM5 or Sennheiser’s Momentum 4 TW. But for earphones in this price range, the OpenRock Pro perform well. I’d rank them as upper mid-range.
Who are the OpenRock Pro for – and when would you use them?
The sound isn’t bad. But which use cases is the OpenRock Pro’s special design meant for? They can be great if, for example, you find in-ears uncomfortable but don’t want to carry around bulky over-ears either. Or if you want to remain aware of your environment when listening to music, such as when jogging or cycling.
The problem here is the volume. At home on my couch, it’s enough. But if I use the headphones in a louder environment, I have trouble hearing the music because of natural soundscapes like wind as well as other ambient noises like engines. Even turning up the sound to full blast isn’t enough. At least the headphones do stay put when running to catch the bus.
My concerns of sound bleed proved unnecessary. Sound bleed refers to when those around you can hear the sound coming out of your headphones. I had a friend sit next to me on the bus. Only when he held his head very close to mine (less than 50 centimetres away) could he listen in. Good thing, too, as no one will be forced to enjoy my fave rendition of Itsy Bitsy Spider...
Hello there! HELLO? HELLOOOOO?!
The microphone is the weak point of the OpenRock Pro. I can’t recommend them as a lightweight headset replacement. When talking on the phone, the person on the other end complains that I’m very quiet. I’m also not particularly audible in audio recordings, like in WhatsApp voice messages. But judge that for yourself:
Brilliant battery
During testing, I got a battery life of nearly 46 hours. Impressive! The earpieces last 17 hours on a charge, and the charging case offers about two more charging cycles. That’s enough to last me a full work week, even with intensive use.
Furthermore, the OpenRock Pro are equipped with a fast-charging function. Five minutes of charging give me 60 minutes of playback time. Charging them for 15 minutes in the morning during breakfast is enough to get me through the day. The earpieces also shine with their energy-saving features. They turn off automatically after ten minutes of inactivity.
The lowdown
The OpenRock Pro from OneOdio sound good, albeit a bit bass-heavy. The unusual form factor proves very convenient. And the battery even outshines the top competition from Sony.
What I don’t like is the microphone, which makes it almost impossible to understand me. Furthermore, the OpenRock Pro’s volume quickly reaches its limits in loud surroundings. But if you’re looking for a lightweight alternative to in-ears for the gym, as a sleep aid, or for jogging in a quiet neighbourhood, I say go for it!
Header image: Florian Bodoky
I've been tinkering with digital networks ever since I found out how to activate both telephone channels on the ISDN card for greater bandwidth. As for the analogue variety, I've been doing that since I learned to talk. Though Winterthur is my adoptive home city, my heart still bleeds red and blue.
