New Heathkit AS101 owner - First post.

[alancohen]

Thanks!

And yes, it appears I'm getting every bit of 30Hz at significant SPLs. Color me a happy camper.

[alancohen]

A proper tripod...

Measurements to follow.

[alancohen]

I downloaded the calibration file. My Mac won't save it as a txt file. I copied the data and pasted to Word and then saved as a txt. Yes?

Anyway, this was my first measurement after adding the calibration file to REW. I'm not sure I did it right though.

Do I use 128K length? Single or multiple sweeps?

[Earl K]

I downloaded the calibration file. My Mac won't save it as a txt file. I copied the data and pasted to Word and then saved as a txt. Yes?

Anyway, this was my first measurement after adding the calibration file to REW. I'm not sure I did it right though.

Do I use 128K length? Single or multiple sweeps?

Single sweep will suffice .

Choose a length that gives an @ 5 sec sweep ( usually that 256K at these sample lower rates ) .

Remember to watch your vertical scaling ( you're trying to make it look "pretty" again by squishing the info ) .

The .txt file must have loaded correctly ( assuming you went through the procedure ) if REW didn't put up a warning box ( about non-compatible "this & that" , etc. etc. " ).

That +8db spike at @ 1400hz is pretty worrisome . Is it adjustable in any way ( such as lowering the Lpad drive amount to the horn ) or maybe physically raising the level of the mic so that it's even to the center of the 811H ) ???

[alancohen]

I moved the mic to the center of the horn and about 12" away. Red is L-pad all the way up. Blue is L-pad at 50%.




Mic at my head...

[alancohen]

Blue is with HF comp circuit, green is without.