Constant 60hz on RTA

[jimdecosta]

I'm trying to measure my Room using REW.
I got so far as to notice there's a constant 60hz. (from computer I'm guessing) @ about 70db

I've try installing REW on laptop but the 60hz is still there ? So i assume its AC hum ? dirty lines.
Possibly someone could give a look at my data.

 

[jimdecosta]

Sorry,
My Radio Shack meter is/was the cause. RCA line in on the meter was gootched up!
I ordered a Berringer ecm8000. I know it's cheap, but it's affordable.

 

[Sonnie Parker]

I don't think the Behringer comes with a calibration file. I'd consider the UMIK-1 from miniDSP, as it includes a calibration file. It's the most popular mic for REW.

 

[Wayne A. Pflughaupt]

In addition to what Sonnie said, you’ll also need a USB audio interface with phantom power to use the ECM8000. Unless you already have one, it’d be cheaper in the long run to return the ECM and gete the UMIK-1.

Regards,
Wayne

 

[jimdecosta]

Welp...
I have a calibrated measurement mic that I'm going to use (my nephews) to get my ECM8000 in the ballpark, it will be fine. A few mouse clicks on the cali file and good enough for me. Ideal No! but, good enough.
I'm only measuring the lower frequency 20-300hz maybe a bit higher and generating filters for APO.
No subs - just trying to Limit and clear up the low-end response on some JBL L-46
I don't have an opportunity to make permanent changes to the room. Treatment would be great for the higher freq. but, not in the cards.

I Do have a few USB Interfaces- Focusrite, PreSonus and Steinberg, middle of the road stuff. Nothing fancy.
All (the ones I own) have Fantom Power.
In the olden (Analogue) days we did everything by ear. That RatShack Meter was, guessing, 30yrs old!
and I was that old when I bought it. So yeah, the 60hz bump was present even with no signal run through the meter. Showing on the RTA and in my room measurements.


Q: I've read "somewhere" maybe not to create filers that run up too high, maybe 1k, but more towards 500hz.
So, my question is, should I try to place my cutoff feq. in a "valley" a dip in my response? Does REW create a fade in and out at the cutoff point?

Thanks for lookin in
JimD
Nice BASS Wayne

 

[Wayne A. Pflughaupt]

I Do have a few USB Interfaces- Focusrite, PreSonus and Steinberg, middle of the road stuff. Nothing fancy.

The collective experience holds that the best interfaces for REW are the simple ones – typically stereo or mono devices.

Q: I've read "somewhere" maybe not to create filers that run up too high, maybe 1k, but more towards 500hz.

There are differing opinions on that. Filters for room correction will be below the Schroeder frequency, typically 100-300 Hz depending on the room. Above that point, typically only to correct deficiencies with the speakers themselves. With the latter, filters should be L/R matching because mismatched filters can mess with the imaging in the frequency range where they are applied.

So, my question is, should I try to place my cutoff feq. in a "valley" a dip in my response? Does REW create a fade in and out at the cutoff point?

Not sure what you mean about a cutoff frequency. That’s not typically done when speakers are run full-range.

Nice BASS Wayne

Thanks!

Regards,
Wayne

 

[jimdecosta]

Cutoff frequency for my EQ Filters. I guess that is APO related and not REW.
I'm applying filters for the lower end, 300hz is my cutoff point. Ohh gee that sounds like I'm high passing to 300hz. My filter will run from 20-300hz