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Search: Posts Made By: Bill Fitzmaurice
Forum: Subwoofers, Bass, and Transducers   05-22-2015, 07:26 PM
Replies: 21
Views: 448
Posted By Bill Fitzmaurice
+1. There must be a fair amount of phase shift...

+1. There must be a fair amount of phase shift and/or arrival time between what the two ears hear for directional triangulation to occur. That can't happen with wavelengths in excess of roughly 10...
Forum: Audio Theory, Setup, and Chat   05-22-2015, 07:09 PM
Replies: 37
Views: 295
Posted By Bill Fitzmaurice
Damp concrete is just as much a problem as damp...

Damp concrete is just as much a problem as damp ground. The only drill I still use that is corded is a rotary hammer. Double insulated, of course. :)
Forum: Speakers   05-22-2015, 03:00 PM
Replies: 12
Views: 192
Posted By Bill Fitzmaurice
There's no such thing as free shipping, it's...

There's no such thing as free shipping, it's included in the price, even though it's not itemized. UPS/FedEx etc. make it a habit of getting paid for their services, and one way or another it comes...
Forum: Audio Theory, Setup, and Chat   05-22-2015, 02:02 PM
Replies: 37
Views: 295
Posted By Bill Fitzmaurice
Neutral is at ground at the service entrance. As...

Neutral is at ground at the service entrance. As I explained above it will not be at a significant distance from the service entrance. One reason for the use of GFI outlets is that in a kitchen or...
Forum: Audio Theory, Setup, and Chat   05-22-2015, 11:44 AM
Replies: 37
Views: 295
Posted By Bill Fitzmaurice
You would not be able to sell a drill like that...

You would not be able to sell a drill like that today. If the case isn't connected to a third wire ground then the case must not be made of a conductive material. But until roughly the early 1970s...
Forum: Subwoofers, Bass, and Transducers   05-22-2015, 05:59 AM
Replies: 21
Views: 448
Posted By Bill Fitzmaurice
What you're hearing coming from the center and...

What you're hearing coming from the center and side is above 80Hz. The bass fills the room and you can't tell where the source is. The higher frequency information that you can directionally locate,...
Forum: Audio Theory, Setup, and Chat   05-22-2015, 05:36 AM
Replies: 37
Views: 295
Posted By Bill Fitzmaurice
You can run into the same issue with a 3 wire...

You can run into the same issue with a 3 wire system when the distance from the chassis to the service ground is too long. One common example is outdoors. For instance, you're using a 50 foot...
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 08:03 PM
Replies: 4
Views: 126
Posted By Bill Fitzmaurice
That's not a review, it's thinly veiled...

That's not a review, it's thinly veiled advertising. The chart is a joke. It doesn't show what it supposedly does below 100Hz where subs work. The reason? It doesn't do anything.
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 07:56 PM
Replies: 21
Views: 448
Posted By Bill Fitzmaurice
They may be large but chances are they don't go...

They may be large but chances are they don't go below 60Hz, if that low. They're probably high sensitivity pro-sound woofers that trade off low frequency response for high output. They use those...
Forum: DIY Speakers and Subs   05-21-2015, 07:52 PM
Replies: 7
Views: 103
Posted By Bill Fitzmaurice
The U15 works very well in 16 cu ft (net) with...

The U15 works very well in 16 cu ft (net) with 16Hz tuning, which gives very flat response and a 15Hz f3. If you go smaller it has a response hump in the low end, and the smaller you go the worse the...
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 12:06 PM
Replies: 4
Views: 126
Posted By Bill Fitzmaurice
Floors are the same as eardrums. They vibrate in...

Floors are the same as eardrums. They vibrate in response to the long wavelength low frequency waves produced by the movement of the driver cone. Nothing placed under the sub will stop that.
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 11:59 AM
Replies: 21
Views: 448
Posted By Bill Fitzmaurice
With a few exceptions commercial theaters aren't...

With a few exceptions commercial theaters aren't all that good. Most don't go below 30Hz, because the subwoofer size, subwoofer count and required power is too expensive for the size rooms that they...
Forum: DIY Speakers and Subs   05-21-2015, 11:52 AM
Replies: 20
Views: 243
Posted By Bill Fitzmaurice
I've always found WinISD to be quite accurate....

I've always found WinISD to be quite accurate. That's after designing, building and measuring a few hundred speakers.
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 05:53 AM
Replies: 29
Views: 497
Posted By Bill Fitzmaurice
You only get that by running at very high levels,...

You only get that by running at very high levels, in excess of 105dB at the LP. That requires both large subs and multiple subs. It also means having the overall level that high or it's not going to...
Forum: Subwoofers, Bass, and Transducers   05-21-2015, 05:48 AM
Replies: 2
Views: 47
Posted By Bill Fitzmaurice
That probably indicates a fault in the amp.

That probably indicates a fault in the amp.
Forum: Speakers   05-20-2015, 01:53 PM
Replies: 2
Views: 41
Posted By Bill Fitzmaurice
Fully enclosed in-walls can work better than...

Fully enclosed in-walls can work better than bookshelves or floorstanders, as flush mounting eliminates cancellations caused by Allison Effect. The downside is that most can't be toe'd in. They...
Forum: Subwoofers, Bass, and Transducers   05-20-2015, 11:13 AM
Replies: 13
Views: 255
Posted By Bill Fitzmaurice
OTOH my band was practicing in a basement,...

OTOH my band was practicing in a basement, concrete floor, no protection. We got a direct hit on the house. I felt a decidedly unpleasant tingle through the strings on my guitar. The only damage...
Forum: DIY Speakers and Subs   05-20-2015, 08:23 AM
Replies: 14
Views: 160
Posted By Bill Fitzmaurice
Not necessarily. I have a gun with a large 2mm...

Not necessarily. I have a gun with a large 2mm nozzle, which works fine with latex paint. Used with a metallic acrylic lacquer, standard auto paint, the color is mottled with severe orange peel. With...
Forum: Speakers   05-20-2015, 08:14 AM
Replies: 5
Views: 84
Posted By Bill Fitzmaurice
That rules out ground looping. The house wiring...

That rules out ground looping. The house wiring could be at fault. The easiest way to check that is to try one in a neighbors house. If the noise is still there I'd send them back.
Forum: Subwoofers, Bass, and Transducers   05-20-2015, 07:01 AM
Replies: 13
Views: 255
Posted By Bill Fitzmaurice
+1. No protector will stop a lightning hit. The...

+1. No protector will stop a lightning hit. The good news is that they're very rare. Outfits like Tripp Lite don't offer $25k damage coverage because they're that good, they offer it because the...
Forum: DIY Speakers and Subs   05-20-2015, 06:53 AM
Replies: 14
Views: 160
Posted By Bill Fitzmaurice
Not necessarily. I use a compressor for high...

Not necessarily. I use a compressor for high quality finishes, which rely more on the gun nozzle size than anything else. Too large a nozzle won't give good atomization. As for pressure, I only run...
Forum: Audio Theory, Setup, and Chat   05-20-2015, 06:42 AM
Replies: 37
Views: 295
Posted By Bill Fitzmaurice
It's still about current, not voltage. Consider a...

It's still about current, not voltage. Consider a Taser. They are 50,000 volts when making the initial contact between the Taser probes and the skin. The voltage has nothing to do with the strength...
Forum: Dedicated Theater Design & Construction   05-19-2015, 09:07 AM
Replies: 48
Views: 630
Posted By Bill Fitzmaurice
If you want to attract women drive a Rolls. :)

If you want to attract women drive a Rolls. :)
Forum: Subwoofers, Bass, and Transducers   05-19-2015, 09:02 AM
Replies: 50
Views: 3,823
Posted By Bill Fitzmaurice
That placement, with the sub baffles and mains...

That placement, with the sub baffles and mains baffles the same distance from the wall, insures that you're going to have an Allison Effect response dip. The sub baffles should be significantly...
Forum: Dedicated Theater Design & Construction   05-19-2015, 08:06 AM
Replies: 48
Views: 630
Posted By Bill Fitzmaurice
The number one cause of death of young men of...

The number one cause of death of young men of every nationality is stupidity. The best you can say here is that this idiot won't get to pass his stupid genes on to another generation.
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