I received my MPA-S250NC (with the RCA config, deal with it ) and I took some photos of the interior. The case is 4 pieces, two identical upper and lower halves made of 4-5mm extruded aluminum with vents machined, with a nice bevel, an 8mm machined aluminum front plate and a thin steel rear plate. The top vent is towards the rear so natural convection passes airflow over the board across the length of the case. The builder has threaded the screw "rails" and used normal screws instead of self-tapping ones so the case can be assembled and disassembled with no fear of stripping.
Build seems clean with no soldering artifacts, cables are nicely routed with low level input cables separated from the high level output and main input. Resistance between the mains IEC earth pin and the amplifier's heatsink base is 0.1 Ohms so the build is properly earthed. Audio ground is separated from mains earth, the RCA and speaker connectors have insulators to prevent them from touching the case. Speaking of the speaker connectors, they are extremely high quality and grip the cables very well, as well as being easy to tighten due to the smooth threads. The IEC socket features a switch but no fuse.
Operationally, the amp is silent and doesn't buzz when the DAC connected to it is unpowered. There's no turn-on thump and an imperceptible one at turn-off. I have to put my ear 30 cm from the woofer to hear it. It seems to be driving the DBR-62s nicely and doesn't even get warm.
All in all, it seems like a good option at a bargain price for someone looking for an NC252MP amplifier at a very good price. Images are attached to this post.
Build seems clean with no soldering artifacts, cables are nicely routed with low level input cables separated from the high level output and main input. Resistance between the mains IEC earth pin and the amplifier's heatsink base is 0.1 Ohms so the build is properly earthed. Audio ground is separated from mains earth, the RCA and speaker connectors have insulators to prevent them from touching the case. Speaking of the speaker connectors, they are extremely high quality and grip the cables very well, as well as being easy to tighten due to the smooth threads. The IEC socket features a switch but no fuse.
Operationally, the amp is silent and doesn't buzz when the DAC connected to it is unpowered. There's no turn-on thump and an imperceptible one at turn-off. I have to put my ear 30 cm from the woofer to hear it. It seems to be driving the DBR-62s nicely and doesn't even get warm.
All in all, it seems like a good option at a bargain price for someone looking for an NC252MP amplifier at a very good price. Images are attached to this post.