- Mar 1, 2018
- Gold Coast, Queensland, Australia
For these toys with output LC filter outside feedback loop the interaction of speaker RLC complex impedance especially with filter C (usually in 1uF order) is even more important than a mere loading by a resistor, which does not cover effects of imaginary part of load impedance. Resistive loading only indicates to damping of the LC circuit. Complex impedance changes the whole frequency response.
Much of this is an academic exercise. A speaker load will never be pure resistance. Enter the concept of the crossover. Most crossovers will have resistors in series and parallels with the driver (think L-pad). Then throw in some capacitors, inductors and Zobels for equalization and it is all just an argument for fun anyway.But in what way? Are there measurements on dome tweeters vs. pure resistive load? Amir did say it depends...nice. What is the thendency? Or where i can see measurements from a dome compared to resistive load ?
Much of this is an academic exercise. A speaker load will never be pure resistance. Enter the concept of the crossover. Most crossovers will have resistors in series and parallels with the driver (think L-pad). Then throw in some capacitors, inductors and Zobels for equalization and it is all just an argument for fun anyway.
They have the MX5 which is a more powerful version of what the TP30 once was.My wife is using a 11 year old Topping TP30 desktop amp that also has headphone jack, USB but no bluetooth. Might not have the Aiyima specs but the capability with to switch between speakers and headphone is a big plus for casual computer listening. Can't understand why Topping never upgraded and continued to produce this model.
Agree. I recently found a USB dongle DAC I'm quite happy with for laptop/desk use. I too am thinking of the A07. More power than I need, but good SINAD so it won't be annoying. At $79 delivered it's hard to beat.Could always do the A07 if you just want the amp and no dac. In any case, this Aiyima is a completely serviceable amp for desktop/bookshelf speakers in a smaller listening space for only $160. Probably only a short matter of time before they figure out how to offer this same power at the same price with a SINAD of 115db.
It seems it is the successor of the A08, would be interesting to see what their differences are as the chipsets seem to be the same and the A08 is stated at their website with higher SNR:
The A200's USB input is realized using the D/A conversion function in the qcc3034 BT module. There is no dedicated DAC for USB input. So USB input performance will be the same as BT.
I have also seen an identical looking TPA3255 amplifier from Weilang/Breeze at Aliexpress called the "Breeze BRZHIFI TPA3255 Bluetooth 5.0 high-power fever vertical digital power amplifier 300WX2". So my question is, does Aiyima really have engineers and designers like Topping and SMSL? Or are they buying and re-labeling generic Chinese commodity products?
Even if it cost $20 more (or had a remote & cost $40 more) & if every thing was in the 78 SINAD or more zone and 16 bit of dynamic range, that is when I would be able to recommend it to others. Unless that is the case, no.This is a review and detailed measurements of the AIYIMA A200 stereo amplifier with USB DAC and Bluetooth. It was sent to me by the company and costs about US $160.
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The compact size should fit on desks well. Controls are simplicity in themselves: push in the volume control to select input (RCA or Bluetooth/USB). Rotate for volume.
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Nice to see built-in power supply unlike other AIYIMA offerings that required large external ones. Design is based on TI TPA3255 IC.
AIYIMA A200 Measurements
Let's start with RCA input:
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SINAD which represents a measure of noise and distortion is above average:
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So the rest of the tests are with RCA input. SNR is good for class:
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As much as it would be "free", to do it badly, I think it is better not to do it at all.The DAC is there for free and convenience.