New Heathkit AS101 owner - First post.

Thanks!

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

A proper tripod...

Measurements to follow.

http://www.hostboard.com/forums/hbmc...2012/12/19.jpg

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?

http://www.hostboard.com/forums/hbmc...2012/12/13.png

Quote:

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Originally Posted by 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?

http://www.hostboard.com/forums/hbmc...2012/12/13.png

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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 ) ???



:)

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%.

http://www.hostboard.com/forums/hbmc...2012/12/14.png


Mic at my head...

http://www.hostboard.com/forums/hbmc...2012/12/15.png

Blue is with HF comp circuit, green is without.

http://www.hostboard.com/forums/hbmc...2012/12/16.png

Quote:

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Originally Posted by alancohen

Nice, much much better ! I agree. I feel much better now. I knew they sounded good to me, but since they're my first, who knows?

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Don't second guess yourself. Usually your first impression is the right one..If they sound good to you just enjoy them for a bit..We are all here to try and make some improvements however small they maybe.It is part of the fun of enjoying your Altecs.. It will become an addiction, but a healthy one.Beware ! :Big smile:

Hi Alan,

Thanks for the pics . Boy, the response of that horn sure changes with different positioning of the mic .

http://www.hostboard.com/forums/hbmc...2012/12/15.png

This one ( test mic by head ), where you standing or sitting ? It's interesting how it has the flattest response from 2K to 10K .

As AB said, it's really important to trust your ears ( me paraphrasing ).

:)

Here's a measurement I took of my 19's a couple years ago. 1/6 octave smoothed.

It's pretty flat from say 1300 Hz - 15k. Your 802's should look similar to this,although I'm using the M19/1201 networks obviously.

http://www.hostboard.com/forums/hbmc...2012/12/20.jpg

http://www.hostboard.com/forums/hbmc...2012/12/14.png

This pic showing the effect of the variable Lpad shows the acoustic crossover is right around 1K .

:)

PS ; When are you going to install the 802G drivers ?