I am testing the A07 with 2 different power supplies. One of them is a linear regulated PSU with 30Vdc voltage and current 1.5A max. This is not originally intended for audio, but for instrumentation. It has low noise of 143uV (BW 24kHz) and very very low hum components. However, due to low output current the usable power is limited. The second is an unregulated linear 50Vdc power supply which is able to give 10A current. It has a 10 000 uF filter capacitor bank. PLEASE don't believe the high end bullsh*t which has become folk-lore in this goddamned industry. I fell for it in the 80's and it took a few live performances and exposure ot superior pro gear and speakers to bring me up short - and here I am thirty five years on, a grumpy older man He "ignored" the information and its given context altogether and then attempted to advise me from a position of "ignorance" (not to be mistaken for stupidity)His response though is invalid because he chose to be uniformed. See the difference? The hottest running component in my setup with the SparkosLabs SS3602 installed is 63°C and this is running it with a voltage of 40V 10A At the moment I am using it connected to a Fosi T20 Tube Headphone Amp that I use as a preamp, and connected to two ELAC DBR 6.2, and I am extremely happy with the sound quality in this room.

The amp has an auxiliary line level out which is not controlled by the volume knob. I use that to feed my Topping A30 headphone amp and that works great. A brief history of TPA3255 amplifiers​The Aiyima A07 was the first "cheap" class D amplifier recognised by the audio community as "audiophile" quality yet at a nice price for those starting off in the hobby of home audio. It provided clean / neutral sound without the noise / "tinny" sound of previous class D amplifiers in the equivalent price range. It was praised by subjective "YouTube" audio reviewers like the CheapAudioMan yet also highly praised by objective reviewers from AudioScienceReview and others for its excellent SINAD / THD+N values (meaning it provided clean audio without distortion at high levels of output with a neutral accross bass, midrange and treble). There were other competitors in this market but Aiyima iterated over the design of the A07 with the A08 and a number of other class D amplifiers adding more features like bluetooth / tone controls etc to the basic TPA3255 design. However, one must consider this undertaking and take it seriously. Requiring the proper tools, skill and environment to safely modify the case so it doesn't look ridiculously hideous and doesn't cause health concerns from the aluminum waste that will be produced. This is why monitoring the temps of the voltage regulators is important. If you are experiencing temps over 158°F or 70°C. Then you will need to be concerned. Ho sperimentato esplosioni di condensatori elettrolitici, ma la pulizia successiva è molto problematica.The amplifier switched off itself after about 1 minute of this test, due to overheating. However it has survived. You would definitely need to modify the case for the Burson... Even though they make a Dip8 extender that you could use to lay components down... The A07 Pro does not have enough room to do that. I find it interesting that there is no negative leads attached to the speaker binding posts. Not that I can see. See the pics. DY639: The overallity is slightly weaker than DY649, but it has the characteristics of tube amplifier.

L'utilizzo di un condensatore da 50 V su un alimentatore da 48 V comporta il rischio di esplosione a causa del minimo incidente nel circuito. I love having the additional line out for my subwoofer but because it is a fixed-level output, I need to adjust the volume of my sub each time I change the volume on the amplifier. Still, I’m glad it’s there because makes my system sound even better. So... Can we all move past this now? I'm kind of tired explaining commonly accepted scientific facts, common sense and common courtesy to people who should know better. If it's a 50V capacitor, I think it should be used at 40V or less. For a 48V supply voltage, a 63V capacitor must be used. Furthermore, in the case of small Class D amplifiers, these are often installed right next to the heat sink, creating a thermally harsh environment for electrolytic capacitors. Of course the deterioration will continue. Now imagine how bad it is to give advice from an uninformed and ignorant position... This is what Marcos did. You Holmz, did not. This is why he was lambasted and you were not. This is why I corrected others as well.Please note the strange nonlinear behavior at 6kHz. This is completely in conformance with TI SLAA788A document, Fig.87 Such spectrum would make the measuring audio system crazy, so during all measurements in audio band a differential R-C-R lowpass filter is used with -3dB corner at 40kHz. Wideband measurements (with the digital scope) were made without the filter.