AIYIMA A07 Premium TPA3255 Power Amplifier 300Wx2 HiFi Class D Amp Mini 2 Channel Stereo Amplifier for Desktop Bookshelf Speaker Home Audio Theater System with DC 32V Power AdapterClimatePartner certified

TLDR; ELAC Debut 2.0 + Aiyima A07 + OP275GPZ Op Amp DIP = you'll thank me later.I have an IOTAVX amp with Triangle Borea BR03 combo that I compare this with. The IOTAVX combo has more deeper bass and sound stage but really not by much... I love both. Let's just say had I only gotten the ELAC Debut 2.0 + Aiyima A07 + OP275GPZ, I would have been really satisfied. Heck, I wouldn't even know which combo I pick if I HAD to choose.. So yea.. wow!Also, I have very sensitive ears due to being young and dumb standing next to a speaker in a club for hours and not realizing that I was going deaf when I got out of the club. Now whenever I hear speakers with too much pressure from bass my ears go into a fritz and it sounds like a broken speaker. So I can only buy speakers that don't make my ears hurt. Some no-no brands for me were Creative Gigaworks, Edifier S2000MKIII, Fluance Ai41 to name a few. Triangle Borea BR03 and ELAC Debut 2.0 is great for my ears.Background:I bought a set of ELAC Debut 2.0 B5.2 Bookshelf Speakers during Christmas cause it was on sale, originally I was only looking for a tiny computer speaker that could make some noise when I was playing games but the sales and thought of getting something good made me go down this rabbit hole.So I had to look for a cheap desktop amp cause I didn't want to take up too much space.. saw the Aiyama 07 amp and read the reviews, sounded good. Powerful enough for any speaker and small footprint. Then one particular review caught my eye.. they changed Op Amp DIP and the sound made a huge difference. Being a tinkerer I couldn't resist.Scared of breaking the amp?Don't be, it's pretty easy to open.. just use one of those L shaped hex wrench and unscrew the top 2 screws of the amp. There's a small phillip screw in the back that you need to remove. Then loosen, don't completely remove the bottom front with the hex wrench and you can pop the top piece right off.Use a mini needle nose plier to remove the 2 Op Amp DIPs that are located near the front. Note what direction the half rounded side of the DIP is going into the sockets. Slowly pull upward without squeezing the plier too tight until you loosen it. There are 2 of them. Pull them both out.Now the hard part, putting the new OP275GPZ in. Just use the plier to slowly lower it down into the holes but MAKE SURE you are matching the side that has the half rounded (as opposed to the straight edge side) down on to MATCH the drawing (white layout) on the board. If you put it the wrong way and turn on the amp, you'll blow it to smithereens. It's easy to match up though.. just pay attention and look at the drawing on the board. Anyways, after you have inserted both.. close it right back up and enjoy!Comparison of Op Amps:Based on reviews that people left on Aiyima A07 review page, I did AB testing on a few Op Amps.1. First original amp as-is. It was okay, Nothing special but powered the speakers okay. I thought maybe the speakers were only okay.2. So, I bought LME 49720NA NSC Op Amp DIPs ($11 for 5) cause people said this was pretty good upgrade. But man.. it sounded like the left side was softer than the right and I had to +loudness on the left side to sound equal. Played it for a bit just to make sure I wasn't hearing things.. nothing special in separation of instruments, no sound stage as a matter of fact.3. I finally tried the OP275GPZ ($15x2) and if this one didn't work, I was going to go all out and buy some Sparko SS3602 Dual Discrete Op Amp that people were raving about but it was significantly more expensive ($80 with 15% off).LUCKILY, I didn't have to go that far as to buy the Sparko.. curious as to what it might sound like but i don't wanna use that much money to test something. Anyways, These OP275GPZ are INCREDIBLE. The sound separation or sound stage from these ELAC is like from above your head to about as far as your arms can reach. There is very very clear separation of each instrument. And it sounded louder than all the previous DIPs that I tried. This one is just amazing. In fact, I think I'm writing this review just for myself so I won't forget what I did when the Aiyama breaks a few years down the line.You will hear a huge difference.. I'm re-listening everything now and it's just AMAZING. Enjoy!I will be leaving the same review on OP Amp and speaker review pages.

The AO7 2-channel power amplifier has become a classic in the "ChiFi" budget audiophile universe. This new "Premium" edition has made an already great value even better.Aiyima has redesigned the amp with better quality internal components, enhanced heat dissipation, a better layout for the rear side connections, and improved cosmetics. It still has all the original virtues, with plenty of power for even power hungry speakers, great sound with no noise and highly detailed transparent sound, a pre-out and a volume control, user-changeable op-amps, etc. You can push even more power by using a 48v power supply, but I am finding the stock lower voltage PSU is all I need.I can't get over how well these little powerhouses stay cool to the touch even after a full day at high volume.I have one of these running a near field desktop set-up, and I have dedicated another to Atmos height speakers in my home theater. I have already ordered a third AO7 Premium for a 2 channel music system in my reading room, and I expect I won't stop there. The A07's are outperforming (and therefore replacing) much more expensive amplification I have owned and appreciated for years. These tiny amps are certainly the most bang for the audio buck you are ever likely to find.Highest possible recommendation!

This is an amplifier that punches way above its price range and size. It is well built and looks great. It has tested very well for its technical performance (see Audiosciencereview's test report) and that is reflected in its sound performance. I am using it to drive Elac 6.2 Debuts, and it has plenty of headroom that I will never need. And I am using the 32V 5A power supply option, which means I am barely powering it to just over half of the amplifier's output potential.The amp runs very cool when driving my Elac 6.2s. I am using a Schiit Modi 3+/Magni 3+ stack to feed the amp.To take the sound to the "next level", I tried several op amps including one that was recommended by an engineer at Aiyima in a paper called "The OP Chip Can Use on AIYIMA A04 & A07". Obviously I tried the NE5532 that comes with it. This sounds great as it is. I tried the LM4562NA. This offered some improvement. I did not leave this one in long enough to characterize it, only that the sound was "better". I tried the OPA1656, which I feel actually degraded the performance. The op amp that made a significant improvement is the OP275GPZ. This is one that is recommended by the manufacturer as an op amp that offers "Better resolution, low frequency and sound field than NE5532". I found this to be very much true. I think by "sound field" they mean "sound stage" as that really did open up. There is a clear improvement in resolution. I also found the treble to be more refined which was not expected from the description from Aiyima. And it also took "boxiness" out of the vocals. I don't know if the boxiness originated from the amp or my speakers, but the 275 cleaned up the vocals and they are now simply excellent. If op amps were free, I would try some others that the paper recommends. But given that they are not, and I feel I have hit on one that yields a big improvement, I am done searching. Any others will either most likely be a step back or just offer marginal additional improvement.This is a great amp as it ships. Since the input stage op amps are socketed, you have the opportunity to "roll" them to adjust the sound to your liking as I described above. For me, I found the 275 to be a phenomenal choice.Based on my experience, I highly recommend this amp!