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Forum: Receivers, Amps, and Processors   03-28-2015, 09:37 AM
Replies: 5,287
Views: 639,767
Posted By DonH50
Yah, that is what it looks like to me. In the...

Yah, that is what it looks like to me. In the real world I really doubt it matters...
Forum: Subwoofers, Bass, and Transducers   03-28-2015, 07:41 AM
Replies: 18,136
Views: 1,406,008
Posted By DonH50
Awesome links, thank you!

Awesome links, thank you!
Forum: Audio Theory, Setup, and Chat   03-28-2015, 07:40 AM
Replies: 270
Views: 3,906
Posted By DonH50
Regarding "control", a class in feedback theory...

Regarding "control", a class in feedback theory (or two) would explain how it works, the various types of "control", the difference between current and voltage "control" and how they relate to source...
Forum: Audio Theory, Setup, and Chat   03-28-2015, 07:33 AM
Replies: 270
Views: 3,906
Posted By DonH50
That is why I put "linear" in quotes. However...

That is why I put "linear" in quotes. However imprecise the terms technically, and despite the obvious fact that diodes are non-linear devices, it is what the world considers "linear" supplies in...
Forum: Speakers   03-27-2015, 10:08 PM
Replies: 4,020
Views: 477,313
Posted By DonH50
Disclaimer: I have not heard the .7's with a DWM....

Disclaimer: I have not heard the .7's with a DWM. Or without, for that matter, only the larger models.

If space is the issue I would personally skip the DWM, get the .7's, and a Rythmik F8 or F12...
Forum: Receivers, Amps, and Processors   03-27-2015, 10:00 PM
Replies: 5,287
Views: 639,767
Posted By DonH50
I don't have an SC-25 nor its manual to look at....

I don't have an SC-25 nor its manual to look at. My SC-27 claims 24-bit capability for some formats but only 16-bit FLAC. There is a note about using HIBITSMP for 24 bits in the SC-25, search your...
Forum: Subwoofers, Bass, and Transducers   03-27-2015, 09:47 PM
Replies: 18,136
Views: 1,406,008
Posted By DonH50
I've put in 80+ hours the past few weeks, new...

I've put in 80+ hours the past few weeks, new chips got back and aren't working quite right, aarrgghhhh... Should drop down to normal insane hours soon. I need some sleep, got a lot to play in the...
Forum: Audio Theory, Setup, and Chat   03-27-2015, 09:40 PM
Replies: 270
Views: 3,906
Posted By DonH50
Voltage is electromotive force. I would not...

Voltage is electromotive force.

I would not consider a linear supply to be "switch-mode"; different operating principles entirely despite the rectifiers in a "linear" supply.

It is dangerous to...
Forum: Subwoofers, Bass, and Transducers   03-26-2015, 11:37 AM
Replies: 18,136
Views: 1,406,008
Posted By DonH50
Thanks for the kind words! For sub placement...

Thanks for the kind words!

For sub placement in general or for putting subs flush with the mains?

In this case neither choice has anything to do with sound, it's all about where I can place...
Forum: Subwoofers, Bass, and Transducers   03-26-2015, 06:51 AM
Replies: 18,136
Views: 1,406,008
Posted By DonH50
For various reasons my subs sit next to my mains...

For various reasons my subs sit next to my mains (L/R speakers) in my current room. The subs are flush with the front of the mains. I always endeavor to not add additional reflections to the sound.
Forum: Speakers   03-24-2015, 12:51 PM
Replies: 1,259
Views: 88,237
Posted By DonH50
If you check the absorption at NIST, the IBM labs...

If you check the absorption at NIST, the IBM labs site, the NCR site, or just Bob Gold's site http://www.bobgolds.com/AbsorptionCoefficients.htm you will see that 2" falls off below 500 Hz, and does...
Forum: Receivers, Amps, and Processors   03-23-2015, 11:42 AM
Replies: 8
Views: 160
Posted By DonH50
^^^ They put out 88 dB at 1 m with 1 W input at...

^^^ They put out 88 dB at 1 m with 1 W input at the frequency or range of frequencies used for the sensitivity measurement. Ten feet away, a single speaker only puts out 78 dB'ish. Put another way,...
Forum: Subwoofers, Bass, and Transducers   03-23-2015, 11:30 AM
Replies: 8
Views: 190
Posted By DonH50
The null at the midpoint of the room is an issue...

The null at the midpoint of the room is an issue with any room; the only difference is at what frequencies it happens.

It takes a LOT of treatment to counter anything at 20 Hz. Look up the...
Forum: Audio Theory, Setup, and Chat   03-22-2015, 08:14 PM
Replies: 7
Views: 202
Posted By DonH50
18 AWG is about 6.4 m-ohms/foot (0.0064 ohms/ft)....

18 AWG is about 6.4 m-ohms/foot (0.0064 ohms/ft). A difference in length of 10 feet is thus about 0.064 ohms per wire, 0.128 ohms for the pair, hardly significant in an audio system. And most of us...
Forum: Speakers   03-22-2015, 03:10 PM
Replies: 1,259
Views: 88,237
Posted By DonH50
Treatments behind will reduce comb reflections...

Treatments behind will reduce comb reflections and other contributions from the back wave. Should improve imaging and widen the sweet spot. Reduces the contribution from the room so may reduce the...
Forum: Receivers, Amps, and Processors   03-22-2015, 03:01 PM
Replies: 8
Views: 160
Posted By DonH50
You could check an SPL calculator to estimate how...

You could check an SPL calculator to estimate how much power you might need: myhometheater.homestead.com/splcalculator.html

HTH - Don
Forum: Subwoofers, Bass, and Transducers   03-18-2015, 09:08 PM
Replies: 18,136
Views: 1,406,008
Posted By DonH50
Decades ago I decided on servo subwoofer designs...

Decades ago I decided on servo subwoofer designs for their improved performance (lower distortion, better extension for the size, etc.) After doing a bit of research, a bit of research, and a bit of...
Forum: Receivers, Amps, and Processors   03-17-2015, 11:38 AM
Replies: 5,803
Views: 694,136
Posted By DonH50
Without knowing what is programmed into the AVR...

Without knowing what is programmed into the AVR to compensate the mic it came with we have no way of knowing if any mic will work. Almost certainly "any" mic will not work, but chances are the same...
Forum: Audio Theory, Setup, and Chat   03-16-2015, 12:05 PM
Replies: 41
Views: 792
Posted By DonH50
I measure S-parameters all the time, and have...

I measure S-parameters all the time, and have given several talks/tutorials about them, just never to audio amplifier designers. For LF stability Bode, root locus, and the Nyquist stability criteria...
Forum: Audio Theory, Setup, and Chat   03-15-2015, 09:51 AM
Replies: 41
Views: 792
Posted By DonH50
I am pretty sure that in my decades in design I...

I am pretty sure that in my decades in design I have never actually measured the S-parameters of an audio amplifier... What do you use for a reference impedance, 8 ohms? I suspect not a lot of...
Forum: Speakers   03-14-2015, 10:52 PM
Replies: 23
Views: 267
Posted By DonH50
I run a pair of Rythmik's with my Maggies. I...

I run a pair of Rythmik's with my Maggies. I decided several decades ago that servo'd subs were for me, starting with my home-brew design back in the 80's. Today, there are a lot of good choices, and...
Forum: Audio Theory, Setup, and Chat   03-14-2015, 10:15 PM
Replies: 6
Views: 138
Posted By DonH50
At the very least I would run conduit and pull...

At the very least I would run conduit and pull the wires through that to make them easier to replace if something happens in the future.
Forum: Speakers   03-14-2015, 08:32 PM
Replies: 4,020
Views: 477,313
Posted By DonH50
:) Thanks guys. I am still working today, up to...

:) Thanks guys. I am still working today, up to about 84 hours this week, been an ugly one.

I gave up trying to convince people of the merits of placing diffusion or absorption behind their...
Forum: Speakers   03-14-2015, 02:44 PM
Replies: 4,020
Views: 477,313
Posted By DonH50
Yes.

Yes.
Forum: Audio Theory, Setup, and Chat   03-08-2015, 08:41 PM
Replies: 39
Views: 681
Posted By DonH50
Thanks for the compliment. I agree with your...

Thanks for the compliment. I agree with your comments about the crossover, well stated. However, three-way designs can suffer from beaming at higher frequencies, as it depends upon the driver type...
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