AIYIMA A70 Mono Power Amplifier with PFFB TPA3255 Mini Class D Amplifier with Subwoofer HiFi Home Theater Receiver with RCA/XLR/Trigger Input for Shelf Passive Speaker

Come al solito ho aspettato un pò prima di recensire. Che dire,lo sto usando con l'impianto HT in mono su un subwoofer con 2 altoparlanti 4 ohm da 25 cm messi in parallelo tra loro. L'apparecchietto,per le dimensioni, se la cava egregiamente: pilota il subwoofer alla grande,senza minimamente riscaldare. Si, lo consiglio!

Manque cruel de punch. Incapable d'alimenter un sub 12'. J'ai dû le retourner. Sinon objet joli.

Performances tant en puissance, dynamique qu'en distorsion bluffantes. Utilisation sévère sur caisson de basses passif. Réglages parfaits, rendu sonore vraiment excellent!

First of all must explain how this amp works. There is a switch on the bottom to set it for full range or subwoofer. When set for subwoofer duty, the front panel knob on the left adjusts the low pass frequency. Great for adjusting by ear while listening to music or test tones. Perfect for use with a passive subwoofer. I see online reviews that complain about the fact that this does not have a high pass filter to use as a full range mono amp. That is not its best use case. I am using mine with a 12" passive subwoofer I built myself and it works great. I think it is a much better amplifier than a lot of the low cost plate amplifiers out there and the cost is very reasonable. I love that these come with 48 volt power supplies instead of the 32-36 volt supplies that some of these low cost amps come with. That way I don't have to spend more money to upgrade to a 48 volt supply. I will add that this mono amp integrates well with the Aiyima A20 stereo amp which has a high pass filter and a subwoofer out. Last note - if bottom switch is set for full range, there is a small knob on the back that sets the low pass frequency for the subwoofer out on the A70. I really only have one possible negative. This works best with a high efficiency 2 or 4 ohm sub - something that can do 90 dB @ 1 watt. My 12" sub does that easily. If you have a small low efficiency sub, then this amp may not produce enough volume.

Great amplifiers. I have tried quite a few amps over the years and these perform very well. The price to performance ratio is truly impressive. The A70's provide a wide soundscape with excellent detail retrieval and separation between the notes with a slightly laid back sound that I can appreciate. I also tested them using a set of older JBL speakers that have some slightly "bright" tweeters and I found that these Aiyima A70 Monos paired better compared to the Fosi V3 Monos I had connected previously. I am constantly very impressed with their sound quality. I then connected a powered Subwoofer and to my surprise I found that the Crossover knob on the back of the A70 worked better than the Subwoofer's Low Cut knob. I used a small screwdriver to make micro adjustments when dialing in the Low Cut on the 'Sub Freq' dial on the rear. A great feature that I was not expecting to use. I opened up the amp to inspect the build and immediately noticed that the A70 has a bigger and better heat sink compared to my Fosi V3 Monos, and they do indeed run cooler. There was plenty of power for my speakers and I only noticed a tiny amount of distortion at really high volume. I suspect that they may not sound quite as clean with really power hungry speakers at really high volume levels. I would easily recommend Aiyima A70 Monos and I am happy I bought them! (streaming Tidal, SMSL D0100 DAC, Mogami XLR Cables, 2 x 48V 5A GAN power supplies).