Model 19 digital delay

**maxserg** · November 25th, 2015, 01:21 PM

Originally Posted by donaldpatten

les

Its a pulse . Made of half a 1600 Hz sine wave repeated at a 30 cps rate.

/Users/donaldpatten/Desktop/1600HzPositivePulse30cps.aif

I do not know if this will play

Don

- - - Updated - - -

Les

It should look like this:

----/\-------------------------------------

Don

Would it be better to measure it at the XO point?

**donaldpatten** · November 28th, 2015, 01:14 AM

Maxserg

Thats the beauty of using a pulse, It covers all freqs.
So your XO could be : 500Hz, 1500Hz, 3000Hz , or anything in-between.

Don

**les winter** · December 1st, 2015, 07:28 AM

The link didn't work.
I put a 1k sine wave through lf/hf drivers and measured the output with a mic. I then played with the delay; both HF and LF. Any delay decreased the signal received by the mic. Seems like they are pretty well aligned.

GM · December 2nd, 2015, 09:10 PM

Yeah, Altec did a pretty good job with all the constraints they had to deal with and why I don't understand what's going on with OG's 4 ms.

Anyway, WRT attaining a good time and phase coherence, this may be of interest: Phase and Time align subs with main speakers - diyAudio

GM

**bowtie427ss** · December 3rd, 2015, 09:13 AM

and why I don't understand what's going on with OG's 4 ms.

Was the 4 ms reference measured?

How would we measure it?

I wonder if 4ms is simply a reference to the printed scale for the adjustment pot on an analog device.

FWIW, i have an analog network with delay in the HF filters, but it's 2ms max. I have always assumed that the scale HAS to allow for a certain degree of tolerance, maybe up to 10%, or could reality be even further away?

**donaldpatten** · December 3rd, 2015, 11:53 PM

Les, GM , Bow Tie… if you would like to try my disc to measure delay, PM your address to me.
You will need a Oscope to.

Don

**donaldpatten** · December 20th, 2015, 06:43 PM

les winter, GM , bowtie

Would use guys like a free CD ?

Don

GM · December 23rd, 2015, 02:50 AM

No, but thanks for the offer! If I'm ever able to do any more DIYaudio, I'll use REW or similar to be able to compare 'apples to apples' with the majority of other DIYers since I already have a mic, etc..

GM