Unfortunately, this deal has expired 11 March 2024.
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505°
Posted 6 March 2024
Edifier R33BT 10W Active Studio Monitor Speakers with Bluetooth w.code sold by emax-uk
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Joined in 2011
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About this deal
This deal is expired. Here are some options that might interest you:
Decent price reduction here, 20% off code applies at checkout.
The Edifier R33BT is a 2.0 studio monitor speaker system with built in amplifier and Bluetooth streaming. Perfect for home audio, work and content creation activities.
FEATURES
The acoustic system composed of a 1/2-inch tweeter and 3.5 inches mid/bass driver to get smooth, loud, and detailed sound out of the small cabinets.
MDF Wooden Enclosure
Wooden enclosure to minimise acoustic resonance, and produce more natural and pure sound.
Compatible with Multiple Devices
Compatible with most devices with 3.5mm AUX input and Bluetooth 5.0. Connect to your smartphones, tablets or computers with ease.
10W RMS Power Output
With a total power of 10 watts RMS, they are great for music, movies, and games, strong enough to fill small and mid-size rooms.
Removable Mesh Grill
Speaker grills protect the speakers from being easily crushed and prevent dust. Easy to remove and install.
User-friendly Operation
The top-mounted controls include power on/off, volume up, volume down, input switching, and press and hold the "-" button to disconnect the Bluetooth.
Specifications
The Edifier R33BT is a 2.0 studio monitor speaker system with built in amplifier and Bluetooth streaming. Perfect for home audio, work and content creation activities.
FEATURES
- Bluetooth V5.0 for easily connecting a wide range of smart devices
- Classic wooden design with MDF materials to reduce acoustic resonance
- 0.5-inch tweeter and 3.5 inches bass driver deliver clean and smooth sound
The acoustic system composed of a 1/2-inch tweeter and 3.5 inches mid/bass driver to get smooth, loud, and detailed sound out of the small cabinets.
MDF Wooden Enclosure
Wooden enclosure to minimise acoustic resonance, and produce more natural and pure sound.
Compatible with Multiple Devices
Compatible with most devices with 3.5mm AUX input and Bluetooth 5.0. Connect to your smartphones, tablets or computers with ease.
10W RMS Power Output
With a total power of 10 watts RMS, they are great for music, movies, and games, strong enough to fill small and mid-size rooms.
Removable Mesh Grill
Speaker grills protect the speakers from being easily crushed and prevent dust. Easy to remove and install.
User-friendly Operation
The top-mounted controls include power on/off, volume up, volume down, input switching, and press and hold the "-" button to disconnect the Bluetooth.
Specifications
- Bluetooth Version: V5.0
- RMS: R/L 5W+5W
- Frequency Response: 70Hz-20KHz
- Noise Level: ≤25dB
- Signal-To-Noise Ratio: ≥85dB(A)
- Distortion: ≤7%
- Input Type: AUX/Bluetooth
- Input Sensitivity: AUX: L/R: 500±50mV, Bluetooth: L/R: 500±50mFFs
More details at Community Updates
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28 Comments
sorted byHaving seen the inside of the unit, the reason for the hum? Simple, the power supply comprised of a transformer, full bridge rectifier and a capacitor… That’s it. No filtering except for that single input cap, not even a voltage regulator. Ok, there was a 7805 but that’s only to supply the Bluetooth chip which does the mode select too.
That is to say my unit wasn’t faulty, just a rubbish design. Disappointingly, not commensurate with the price point in my opinion.
The conversion process was dead simple, I could have simply disconnected the transformer and wired in a 12V DC supply at the input capacitor legs. But I did some extra steps for completeness, I removed the rectifier diodes, removed the transformer, swapped out the no-name input cap for a Panasonic FC (like-for-like 3300uF, 25V) and fitted a panel mount DC connector where fortuitously the panel cut out needed was exactly the same size as the old AC cable gripper grommet hole. All slathered with hot-melt glue, of course.
I toyed with the possibility of adding some ballast to take up the lost weight from the now missing transformer. I decided not to, since I’m fairly sure there’s enough to keep that massive 5W+5W output from vibrating the speaker across the table, and I’m not fooling anyone with that weighty-premium feel, especially not myself given what I’ve just been though.
Also, standby power has fallen from about 2.5W to 0.1W, so I’m quite happy with that.
In its converted state, would I buy it at RRP of £70? No chance. At £55? Eh, maybe.
In its unconverted state. With that 50Hz hum? Not at any price.
The worst thing, and I’m seriously considering returning mine – possibly because they’re faulty, something wrong with filtering maybe, is that when it’s plugged in, whether the soft switch is on or off, there’s always a 50Hz hum from the right-side speaker (the one with the mains connection). When soft-switched on, even with no source connected (BT or AUX), the hum gets much louder, loud enough to hear from the other side of the room, regardless of the volume setting.
But, they do look nice and fit well on my desk. If I don’t return them, maybe I can mod the power supply… The hum, annoying as it is, is a clue, as is the physical heft; I’m fairly confident that there’s a great big transformer in the speaker. The digital controls also offer a clue, the guts of the speaker probably runs on a relatively low DC voltage, 12, 15 or 18V maybe?
All I have to do is remove the mains wiring and disconnect the transformer, then patch in an appropriate DC supply downstream of the bridge rectifier. At 10W of speaker power, there must be more than a few options in my massive box of DC power supplies I’ve hoarded over the years.
Hmm...
Oh, and (still) in stock. (edited)
Ordered them but wondering whether to return and get these instead to save a few bob
Thanks
Now that I’m actually using these speakers in anger, I have noticed and subsequently measured a 50ms delay on the AUX input! I would expect that kind of thing over Bluetooth, but on a wired connection that’s just poor.
So definitely do not buy these if you’re sensitive to delayed audio.
For example, 50ms makes them useless as audio monitors and rather irritating for certain games (e.g. hear a gun shot after you've fired a gun)
Ahh, time to open it up again. I’m fairly confident the audio source switching which is part of the Bluetooth chip is causing this.
I should have returned it