New Heathkit AS101 owner - First post.

**alancohen** · December 11th, 2012, 12:16 PM

Thanks!

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

**alancohen** · December 11th, 2012, 07:18 PM

A proper tripod...

Measurements to follow.

**alancohen** · December 11th, 2012, 07:53 PM

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** · December 11th, 2012, 08:34 PM

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?

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** · December 11th, 2012, 08:55 PM

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** · December 11th, 2012, 10:41 PM

Blue is with HF comp circuit, green is without.

**Altec Best** · December 12th, 2012, 02:17 AM

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?

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 !

**Earl K** · December 12th, 2012, 07:41 AM

Hi Alan,

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

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 ).

**Altec Best** · December 12th, 2012, 07:58 AM

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.