Eversolo EM-01 acting weird?

I recently acquired an Eversolo EM-01 usb mike to be more flexible while measuring.

Somehow it seems that the mike I have has a built-in high-pass filter?





Compared to my normal used measuring equipment (using Clio and REW) the difference in respons is HUGE.

Even my Samsung seems to measure accurate compared to Clio.

Shown 2 measurements at the exact same spot with the Roomcorrection app in the A8, one using the Eversolo EM-01 mike and the other with my Samsung S23 Phone.

 

What do you mean with hi-pass filter? I just see a considerable difference in gain, being higher that of the EM-01...

 

Look at the left scale... bass is -30dB down using the Eversolo mike! The Samsung phone is more accurate and (as in reality) almost flat down to 30Hz ...

The roll-off starts at around 3kHz down to the lowest frequencies (like a 6dB high-pass filter does) while the real response is flat.

 

The two graphics do not seem to be perceived at the same SPL by the application; one averages at -20dB, while the other at -40... 20dB difference is not trivial...

 

The problem is not the sensitivity of the used mikes (the reason for the attenuated plot) but the produced frequency respons.

The same volume setting was used for both measurements...

 

I see where you are pointing at, but my understanding is slightly different: the sensitivity of the mikes may result in a very different response... I may be wrong, though, as this is not my very field of operation.

 

I can measure again but to have the same level showing can only be done while playing much louder for the Eversolo mike...

But it will show the ssme... I have done tests in REW using the Eversolo mike with different gain.

The frequency curve was always the same but louder when turning up the volume.

The low frequency roll-off did not change.

-30dB difference at 30Hz compared to 0dB 5kHz did not change.

My other mikes and the phone do not show this behaviour meaning that the mike seems to be in error?

 

Do you use the mic calibration file?

 

Good point; I assumed that was already done.

 

Not with the example but in REW I did which did not change much related to the issue. Only some minor changes in the highest frequencies...

 

Now... it remains a mystery to me how you could make a statement about your phone's mike being better and more accurate than the EM-01.
What can assure you that your phone is correct, and the EM-01 fails...?
Actually interested, no pun intended.

 

As mentioned in the original thread you could read that I normally use Clio, sometimes in combination with REW. I know how my speakers do measure in reality... my phone is close enough compared to the other mikes I use with REW and Clio.

The only mike acting differently is the Eversolo EM-01 hence this topic started.

 

Now it's clear. Either the EM-01 is a cheap mike, or its calibration file is somehow not properly done / adequate.
It would be interesting at this point to hear from other fellows having used the EM-01 in a context (very) similar to yours, whether they have noticed the same misbehavior.
Thanks for the details.

 

Hey Bert, I've replied to you on FB but I almost forgot to get you here! In our tech's opinion, a replacement is needed.

 

Thanks for the reply, I will forward this to the supplier asking for a replacement.

 

Today I received a new Eversolo mike... same "error" ???

What is going on? Using the Eversolo DMP-A8 for the measurements so the A8 is in error? Or did I receive an identical mike from a corrupted series?

I think the latter... :-(

Next week I will loan another USB mike (MiniDSP Umike 01) and compare it with this second Eversolo EM-01

Eversolo does not respond to any enquiry about this issue...

 

Do the EM-01's come with calibration files? If not, I am keen to think they are not the same sensitivity as others (which is normal and acceptable).
I would try a calibration with it, though, as most probably the software in the ES is more likely to be compatible with it...
Anyway, bear in mind that when it comes to room correction, the main problems are in the BASS / SUB-BASS region; mid-range and highs are not so problematic to correct even manually playing around with ad-hoc EQ settings...

 

Yes with calibration files the same.

Nothing much changed with calibration files mostly in the higher frequency range.

Difference between the first and second mike is that the later received one starts to roll-off from 500Hz and down (same slope). The first one started to roll-off already at 3kHz.

Something is fishy with those mikes.

Next week I will compare a Mini DSP Umike and the Eversolo with REW.

That will show very precise where things go wrong.

 

I am not meaning that...
My point is: do a room correction using the EM-01 AND LISTEN to it. In the end, you will never, NEVER EVER listen the same sound the master engineer have made. This because YOUR ROOM is not the STUDIO where the mastering took place.
The only thing you can achieve is a PLEASANT SOUND without NEITHER too much bass boom, NOR too much high whistling. None of the public, I repeat, NONE, has ever listened to the VERY SAME SOUND THAT WAS IN THE AIR IN THE STUDIO. NO-NE! There are people, otherwise, that do enjoy how the master sounds in THEIR ROOMS.
You may be one of those, if you just give the EM-01 and the room-correction-software a chance.
In the end it is not what it should be; it is what you like. What your brains tells you is right. If it gives you goose-bumps, she's the right one, as they say...

 

I know how things work, I am not advocating to use roomcorrection at all! More fine tuning the speakers and attenuate (a) major peak(s) in the bass range(s) after setting up and properly positioning the speakers (and listening position!)

The issue is that the tool to use for this tweaking is not working properly. First we need a good working tool before you can tweak anyhow! That is the initial topic started here.