AIYIMAA70 Mono Amplifier with PFFB Home Audio Receiver,TPA3255 Class D Amp with Subwoofer for Home Theater Bookshelf Speaker,with XLR & RCA Inputs & Trigger InputClimatePartner certified

This amplifier has loads of improvements over other similar amplifiers:- Beautiful Solid case work with sufficient size and spacing between connectors- Very powerful and clean sound with +6dB gain for RCA connection- Active subwoofer output with low pass filter adjustment- Mono full-range amplifier and sub-woofer amp modes- 12v trigger inputs works well with my DACImprovements:- No pop sound on power on/off, every other amp has this issue but not this one- Does not heat up like others, somehow better thermal performance- Good quality speaker connectors, I am using 12 AWG wires without any issuesHIGHLY RECOMMENDED

This is a mono (1-channel) audio power amplifier, but provides one full-range speaker 50-watt powered low-level output, and one subwoofer passive (mono RCA) output. I hooked it up in concert (Daisy-chained) with another 2.1 channel amplifier, and it sounds amazing, when I synced the timing.

Although I didn’t use it, it arrived on time. I opened it up and it was sturdier built. I only returned it because I wanted my preamp to match my fosi amp.

[edit: I misspoke, the 12v trigger, handshaking issue is with my WiiM Ultra]There's a lot to like about the Aiyima A70 mono. The build quality is 5/5: it has heft & excellent heat dissipation. Thanks to the well thought out, large contact point, between the underside of the board and the case. Making the case the heatsink; just like its closest competitor. But unlike the other company's dedicated mono block (not the one pictured), this unit doesn't require fans, to keep it from having a core melt down (I'm exaggerating, of course, . . . kinda).There are two points that I don't see being well publicized:1. Both front dials are indexed (+)2. The 12v trigger has some handshaking issues with the ZA3 (-), confirmed by Aiyima and unfortunately, that last point keeps the A70 mono from being part of my audio chain.

Electronics engineer's review will be coming soon (tm)As a consumer, the A70 just works. It is a great amplifier with some really cool features I never knew I needed.As far as I can tell, it meets or exceeds all its specifications for TDP, power output etc. I will be evaluating this in more detail under different loads at a future date so for now I will cover more of the cool features:1. XLR is a nice to have. I don't personally have any in my setup but occasionally I have used it for odd or specific setups.2. The +6db is REALLY nice. Some audio sources are really quiet. The worst offender is an LG TV that automatically drops the volume every 30 minutes if you set it above a certain level in the UI. The trouble is, the TV doesn't actually know how loud the room is so this may be going from a comfortable volume to nearly silent. The +6db allows you to get the full range out if this amp with such sources.3. The built in crossover is cool. Not used as I have a full equalizer for room calibration but I can think of times it would be useful.4. The 12V trigger is awesome! I cannot wait to build a custom controller for this that allows it to be switched on and off with the rest of my setup to allow for energy savings.I really only have two gripes:1. AIYIMA already has a product with the name "A70" which could be confusing. They also advertise this as being used for 7.1 surround setups, but having 8 of this seems like it would require excessive tinkering to get a room to sound good compared to an all-in-one receiver that is programmable.

Works like a champ. Needed a little nudge for my passive sub in bedroom. Fits the requirement with ample options!

I was completely puzzled by this (mono/sub) amp as in passive subwoofer mode it barely output even 10w power at max volume and max filter settings. The same RCA input on Fosi Audio TP-02(sun amp) was working perfectly fine and was plenty of lows at just 10 o'clock volume position. I also tried Fosi Audio M03(mono/sub with more power on the paper) and it was not as powerful as TP-02, so volume was at 11 o'clock position to have the same lows output. I was looking for sub amp with trigger to automate on/off, but no luck with this one.

Perfect feature for a mono block amplifier! Capable of connecting two subwoofers.