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Search: Keyword(s): ; Posts Made By: Bill Fitzmaurice
Forum: Speakers   02-12-2016, 07:49 PM
Replies: 2
Views: 43
Posted By Bill Fitzmaurice
My guess is that a solder joint on the crossover...

My guess is that a solder joint on the crossover board is loose, specifically one of the inductor leads. When tilted the weight of the inductor shifts it enough for the lead to make contact.
Forum: DIY Speakers and Subs   02-12-2016, 02:40 PM
Replies: 4
Views: 95
Posted By Bill Fitzmaurice
Use this: ...

Use this:
http://www.bcae1.com/images/swfs/speakerwireselectorassistant.swf
Forum: Audio Theory, Setup, and Chat   02-12-2016, 02:39 PM
Replies: 16
Views: 296
Posted By Bill Fitzmaurice
If something's vibrating enough so that you can...

If something's vibrating enough so that you can hear it then it will show up on a sweep. A more secure mounting method for the heights should fix that.
Forum: DIY Speakers and Subs   02-12-2016, 11:58 AM
Replies: 135
Views: 2,184
Posted By Bill Fitzmaurice
It's not a bad thing, but if the panel doesn't...

It's not a bad thing, but if the panel doesn't vibrate it doesn't vibrate, no matter what its resonant frequency. By and large when you add bracing the resonant frequency goes up, when you add mass...
Forum: Subwoofers, Bass, and Transducers   02-12-2016, 11:52 AM
Replies: 13
Views: 166
Posted By Bill Fitzmaurice
You could do that, though I wouldn't use a...

You could do that, though I wouldn't use a midbass module myself. Driver displacement and power requirements go down as frequency goes up, so no sub needs 'assistance' in the midbass. By the same...
Forum: Subwoofers, Bass, and Transducers   02-12-2016, 09:18 AM
Replies: 13
Views: 166
Posted By Bill Fitzmaurice
True. Below the tuning frequency of a ported sub...

True. Below the tuning frequency of a ported sub the polarity of the port output inverts. A well designed sub will incorporate a high order high pass filter in the amp so that there is no output...
Forum: DIY Speakers and Subs   02-11-2016, 02:50 PM
Replies: 135
Views: 2,184
Posted By Bill Fitzmaurice
And the Captain's name is James Kirk. Arm...

And the Captain's name is James Kirk.

Arm photon torpedoes. :D
Forum: DIY Speakers and Subs   02-11-2016, 11:13 AM
Replies: 96
Views: 13,504
Posted By Bill Fitzmaurice
+1. Directivity is primarily the function of the...

+1. Directivity is primarily the function of the dimensions of the radiating surface, localization is primarily the function of the distance between your ears.
Forum: DIY Speakers and Subs   02-11-2016, 11:10 AM
Replies: 135
Views: 2,184
Posted By Bill Fitzmaurice
+1. The most interesting aspect of the USS...

+1. The most interesting aspect of the USS Zumwalt isn't its use of stealth technology, though. Scuttlebutt has it that it's a test platform for next gen weaponry. It's capacity for generating...
Forum: Subwoofers, Bass, and Transducers   02-11-2016, 09:05 AM
Replies: 21
Views: 537
Posted By Bill Fitzmaurice
If putting them in eight different locations...

If putting them in eight different locations gives better response throughout the room then that's the better option. There's only one way to find out, that being trial and error, measuring the...
Forum: DIY Speakers and Subs   02-11-2016, 07:16 AM
Replies: 2
Views: 50
Posted By Bill Fitzmaurice
Use a shaft extender, they do exist.

Use a shaft extender, they do exist.
Forum: DIY Speakers and Subs   02-11-2016, 07:14 AM
Replies: 135
Views: 2,184
Posted By Bill Fitzmaurice
There is, and it's existed for roughly 3,000...

There is, and it's existed for roughly 3,000 years. Google 'beam deflection'. Where panels are concerned the difference is that one is considering three dimensions versus two.
The same can be said...
Forum: Audio Theory, Setup, and Chat   02-11-2016, 06:32 AM
Replies: 16
Views: 296
Posted By Bill Fitzmaurice
The issue is that you're trying to fix something...

The issue is that you're trying to fix something that isn't broken. Measuring gear is far more accurate with magnitudes of order higher resolution of what it can measure versus what we can hear. Do...
Forum: Audio Theory, Setup, and Chat   02-10-2016, 03:58 PM
Replies: 16
Views: 296
Posted By Bill Fitzmaurice
There's no way that you're going to hear that...

There's no way that you're going to hear that dip, so stop worrying about it. Change the chart resolution to the 1/6th octave that you are capable of hearing and it won't be there anyway.
Forum: Speakers   02-10-2016, 03:52 PM
Replies: 13
Views: 229
Posted By Bill Fitzmaurice
You must be sure that the total power draw of...

You must be sure that the total power draw of whatever's plugged in doesn't exceed 15A. That can be tough to calculate, as amps are rated at full power output, which is very rarely actually realized....
Forum: Subwoofers, Bass, and Transducers   02-10-2016, 02:38 PM
Replies: 21
Views: 537
Posted By Bill Fitzmaurice
Peaks tend to be far less of a problem than nulls.

Peaks tend to be far less of a problem than nulls.
Forum: Speakers   02-10-2016, 02:09 PM
Replies: 13
Views: 229
Posted By Bill Fitzmaurice
That's two watts. [I][B] That's one watt....

That's two watts.
[I][B]
That's one watt. Which means the sensitivity of both with one watt input is the same.

What's significant is the voltage swing required to reach full output. If the...
Forum: Subwoofers, Bass, and Transducers   02-10-2016, 01:49 PM
Replies: 21
Views: 537
Posted By Bill Fitzmaurice
Of course it will, as will a third or a fourth....

Of course it will, as will a third or a fourth. The idea is that one sub's positioning creates peaks and valleys at certain frequencies at the LP, while another sub's positioning will create peaks...
Forum: Audio Theory, Setup, and Chat   02-10-2016, 01:37 PM
Replies: 54
Views: 1,011
Posted By Bill Fitzmaurice
Yes, but it can be succinctly summed up in the #1...

Yes, but it can be succinctly summed up in the #1 (http://www.avsforum.com/forum/usertag.php?do=list&action=hash&hash=1) rule of loudspeaker design: There's no such thing as a free lunch. ;)
Forum: DIY Speakers and Subs   02-10-2016, 09:36 AM
Replies: 135
Views: 2,184
Posted By Bill Fitzmaurice
It's not that it's difficult to understand, it's...

It's not that it's difficult to understand, it's that where speakers are concerned it simply makes no sense. All of your complicated constructions are fine if there is a need to make panels stiffer...
Forum: Speakers   02-10-2016, 08:41 AM
Replies: 13
Views: 229
Posted By Bill Fitzmaurice
No. A higher impedance speaker needs more voltage...

No. A higher impedance speaker needs more voltage swing to reach the same level, but it also takes less current.
Forum: Audio Theory, Setup, and Chat   02-09-2016, 02:37 PM
Replies: 16
Views: 296
Posted By Bill Fitzmaurice
It's very unlikely that a trap will affect that.

It's very unlikely that a trap will affect that.
Forum: Audio Theory, Setup, and Chat   02-09-2016, 01:44 PM
Replies: 5
Views: 86
Posted By Bill Fitzmaurice
A boundary must be solid, and it must be a...

A boundary must be solid, and it must be a wavelength in dimension, otherwise the low frequency waves will simply go around it. The exception is when there's another boundary that prevents the wave...
Forum: Speakers   02-09-2016, 01:03 PM
Replies: 15
Views: 252
Posted By Bill Fitzmaurice
Banana plugs are a convenience if you're in the...

Banana plugs are a convenience if you're in the habit of disconnecting and reconnecting your cables but otherwise serve no purpose. I don't bother with them.
Forum: Audio Theory, Setup, and Chat   02-09-2016, 12:55 PM
Replies: 5
Views: 86
Posted By Bill Fitzmaurice
1/4 space is when there are two boundaries less...

1/4 space is when there are two boundaries less than 1/4 wavelength from the radiating plane. 1/8 space is when there are three boundaries. 1/4 wavelength at 80Hz is 3.5 feet.
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