[ktziavos]

Hello there! Perfect sounding Eq! Have a small problem with the eq that i want to solve cause i want to use the pre mode. Yen i am in xlr mode everything sounds good. When i turn it to the Pre mode, sound is the same like in xlr but it adds a hisss (hi frequency noise) and it is unusable. Any idea?

[JPK]

It seems to be a gain staging problem.
Try increasing the gain at the preamp, via the gain switch and decreasing the level with the trim pot.
What is the sensitivity of your converters? If adjustable try reducing it. If not possible you could also add a Pad after the preamp.

[Alex Harmer]

I visited the forum today to see if anyone else had had this issue.

The EQ is gorgeous. In XLR mode it is totally clean. I have operated these units successfully since early 2025 with no issues. 

Today I noticed in Pre mode that decreasing a frequency caused hiss. This happened across the highs, the mids, and the lows, but it was most noticeable with the high frequency control. 

It happened in the first 30dB of gain on the MP573. On 40dB and above, the hiss was not as bad.

I'm totally happy to just use the EQ in XLR mode, but I thought it would be worth alerting JPK.

Are you able to go in to a bit more detail about the benefits of Pre vs. XLR mode JPK?

Thanks,
Alex Harmer