renkforce mp2000 power measurements and mini review

mon ramon ra wrote 11/15/2017 at 23:17 • 2 min read • Like

wattage test of the renkforce mp-2000

it is rated for 100wrms / 4ohm load at one channel driven.

i decided to test if that is true.

my results:
no load volt: 18AC on terminal
1ch 4R7 dummy load volt: 17.9AC (68W)
1ch 3R8 dummy load volt: 17.7AC (82W)

not the rated watts, but still rather good.
especially given these facts:
only costs around 90€ msrp (conrad store)
is using discrete class a/b amplifier IC's
has a toroid transformer, something my ht receiver worth over $1k doesn't have!
is passively cooled (no noise, though don't play it loud for too long)

extra notes:
all tests with max input voltage, lightly clipping, 50hz test tone
i don't have enough resistors to test 2 channels at the same time ^^;
i first thought the transformer was 120VA 23v, but it turns out it's close to 160VA, 23v

improvements needed:
with 18volts peak AC (aka 36VDC) and the caps being rated at 35V 4700UF, i might have to upgrade those soon to improve lifespan.
i won't recommend this amp for lower than 6ohm speakers if you want to play loud. (possible overheating problem)
the heatsink design isn't very effective when the amp is on it's feet, giving higher thermals, hence why i don't recommend 4ohm loads.
a power led would be useful, as well as a secondary input.
i prefer this amplifier without those mounting tabs (or at least i prefer them removable) so it fits better with my desk and saves some width.
the internals are semi modular, so one can make a unique case for it. (good for a DIY receiver or something)
to save power, one can also swap the transformer for a 18V 160VA one.
a speaker protection relay isn't included, so be carefull with clipping.

rather good value for the money
gets close to it's rated watts
good for modding

barely any protection circuitry
can get hot on < 6ohm loads
coupler caps have a supertight voltage rating

......well, it seems i wrote a review instead of a test, anyhow, sharing my knowledge about this amp with hackaday! :