Hello and welcome again to Mixers Inside. Today we will try to modify
the sound of Omnitronic mixer by replacing the stock 4580
op amps with other stuff. First thing that came to
my mind were phono preamps. Replacing them with better performing op amps
with higher open loop gain and JFET inputs can result
in change of sonic characteristics. In this 2 channel mixer there
are 2 single op amp phono preamps so i had to change 2 chips. The second thing i thought
that can be interesting to try wa
s summing amp chip replacement. There were so many op amps on
the mainboard and i was too lazy to do reverse engineering so i thought
it will be easier to change all of them. For the summing amp I chose legendary
TL072 chip that works in summing amps of mixers like UREI 1620 and
other classic well known mixers. Let me show you the full process of op amp change. I've obviously recorded sound before and
after the modification. But let's treat things seriously and don't listen to it on YouTube
. In the description i provided the link to hi-resolution files recorded with high performance ADC. I also recommend downloading ABX tester
for foobar to perform faithful testing. Doing ABX test will first help
you to answer the question "can you hear any difference" and if yes then you can try to choose what
sounds better for your ears. I would be more than thankful for sharing
you thoughts in the comments. Cheers!
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