Built-in speakers
Let’s start with the speakers, because you can’t miss them when you remove the front cover. We see two 10 cm speakers for the mid and bass range in the center and quite present. These are front-through and screwed chassis with a relatively long stroke. Furthermore, resonance tubes placed on the left and right at the bottom provide bass reinforcement, and it’s good that the openings are at the front. This clearly accommodates a shelf setup, but brings slight problems when it comes to the acoustic “short circuit”.
The tweeters (tweeter) are installed as a 19 mm silk dome with an implied wave guide, which is perfectly adequate and also works well. We thus see a 2-way stereo system, although a true electrical bandwidth extension is missing here. The DSP would certainly have been able to do that, but in the end you won’t notice anything from a distance of 1 to 2 meters.
Connectivity and ports
Now we come to the cover plate of the back, which also carries the power supply and the amplifier section inside. There is a real off switch, which is certainly not a bad idea with an idle power consumption of just under 2 watts. If Bluetooth is active, it is up to 3 watts. However, this is probably due to a permanently present quiet signal. The line-out is also smart and I connected a thick subwoofer just for fun. Those who don’t know believe in the reinvention of physics in amazement, and yes, the fun works every time. 😀
Otherwise, there is still an analog line-in, which consists of a parallel-connected RCA stereo input and 3.5 mm jack input. USB and SPDIF are unfortunately missing, so there is no digital input except for Bluetooth (BT 5.0, no aptX or AAC support). But no matter, actually you will hardly need it on the shelf or in the kitchen. And we also see here eight screws that absolutely could not resist my curiosity. Let’s go to the teardown!
Teardown: Amplifier board and power supply unit
This time everything is brutally glued and I did not cut and release the relevant connectors at the hot glue layers. My fingers were too thick for that. But you can also see roughly what’s inside. Most noticeable are the two power amplifiers per channel. Edifier relies on one TAS5805M Class-D amplifier from Texas Instruments per channel. This is a highly efficient closed loop stereo amplifier. So this ends up being a fairly inexpensive solution with a single digital input, but it’s really usable. The device’s integrated audio processor (DSP) and 96 kHz architecture support advanced audio processing, including SRC and 15 BQs per channel.
The unit also supports digital volume control, fourth-order 3-band DRC, full-band AGL, THD management, and an optional level meter (not implemented). Now we also know that Edifier uses the internal sound processor here as an active crossover for the two-way system. By the way, the power specifications on the data sheet are correct, because the TAS5805M delivers 2 × 23 W in 2.0 mode at 8 Ω at 21 V. Since the operating voltage is only slightly lower, the 20 watts RMS are also really real. The tweeter is driven with slightly lower power. The two very efficient power ICs are each cooled with a massive copper island on the back, which is completely sufficient.
With its proprietary hybrid modulation scheme, the TAS5805M consumes very low quiescent current (< 16.5 mA at 13.5 V PVDD), extending battery life in portable audio applications. With the implemented EMI suppression technology, you can also use low-cost ferrite bead filters to save board space and system cost. And that is exactly the purpose of the exercise. Cost-down yes, but fit for purpose and not detrimental to the bottom line. You can leave it like that. The Bluetooth chip is underneath the label with the QR code, and the antenna is implemented as a trace on the circuit board.
The built-in switching power supply only provides a fixed output voltage, so there is no extra standby source. The low voltage (3.3 volts) for the control panel and the IR receiver of the remote control is generated on the amplifier board with a simple series regulator (MOSFET in the middle). This also saves effort and cost on the power supply, but it has a decent 2-stage input filtering.
All in all, this is solid, although not high-end. However, for this the price is ok and you really get what you paid for. Category: functional and good.
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