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Search: Posts Made By: Bill Fitzmaurice
Forum: DIY Speakers and Subs   06-02-2015, 09:06 AM
Replies: 22
Views: 229
Posted By Bill Fitzmaurice
There's the rub. Low Q drivers work best ported,...

There's the rub. Low Q drivers work best ported, high Q work best sealed, and even if you find a medium Q driver that will work reasonably well in either the box sizes will probably be not even close.
Forum: Subwoofers, Bass, and Transducers   06-01-2015, 06:29 PM
Replies: 8
Views: 251
Posted By Bill Fitzmaurice
If the larger sub is placed further away and the...

If the larger sub is placed further away and the smaller closer to the LP then the smaller doesn't need to have the same output capacity. But you do want their response curves to be pretty close.
Forum: DIY Speakers and Subs   06-01-2015, 06:24 PM
Replies: 11
Views: 191
Posted By Bill Fitzmaurice
Rat fur? I stopped using it when I discovered...

Rat fur? I stopped using it when I discovered DuraTex. By sheer coincidence the sales manager at AcryTech used to live in the same town where I do now.
Forum: DIY Speakers and Subs   06-01-2015, 12:03 PM
Replies: 11
Views: 191
Posted By Bill Fitzmaurice
With DuraTex you do want to put it in the sun....

With DuraTex you do want to put it in the sun. Unlike paint it cures best when heated; commercial users typically have a curing 'oven' where cabs are baked at 250 degrees for a few hours. Not having...
Forum: Subwoofers, Bass, and Transducers   06-01-2015, 05:28 AM
Replies: 8
Views: 251
Posted By Bill Fitzmaurice
+1. Below 80Hz they're almost impossible to...

+1.
Below 80Hz they're almost impossible to damp. Bass traps are mis-named, as they're most effective in the mid-bass, above 100Hz.
Forum: Subwoofers, Bass, and Transducers   06-01-2015, 05:24 AM
Replies: 4
Views: 85
Posted By Bill Fitzmaurice
Search 'ground loop', the topic comes up at least...

Search 'ground loop', the topic comes up at least once a week. The number one cause of ground loop noise is the TV cable connection, which should be transformer isolated.
Forum: Subwoofers, Bass, and Transducers   05-31-2015, 03:34 PM
Replies: 380
Views: 10,318
Posted By Bill Fitzmaurice
What most users are concerned about is how much...

What most users are concerned about is how much more output will they get with two subs versus one. That's 6dB. The math gets complicated, and if you add enough speaker count doubling eventually you...
Forum: Speakers   05-31-2015, 09:20 AM
Replies: 11
Views: 141
Posted By Bill Fitzmaurice
The phrase 'look before you leap' comes to mind....

The phrase 'look before you leap' comes to mind. :)
In any event, bookshelves above the screen aimed down would work better, along with subs of course.
Forum: Speakers   05-31-2015, 07:54 AM
Replies: 11
Views: 141
Posted By Bill Fitzmaurice
+1. The high frequency elements need to be at or...

+1. The high frequency elements need to be at or somewhat above head height.
Forum: Subwoofers, Bass, and Transducers   05-31-2015, 06:58 AM
Replies: 380
Views: 10,318
Posted By Bill Fitzmaurice
You'll learn more with a minor there in Acoustics...

You'll learn more with a minor there in Acoustics than with any EE BS program that I'm aware of, unless you happen to go to Hartford, Penn Sate, or Texas Austin, which have acoustical engineering...
Forum: DIY Speakers and Subs   05-31-2015, 06:34 AM
Replies: 7
Views: 117
Posted By Bill Fitzmaurice
I wouldn't, as the expansion/contraction of the...

I wouldn't, as the expansion/contraction of the planking could overwhelm the MDF joint strength, pulling it apart. At the very least the outer planking would probably separate from the MDF. Veneer is...
Forum: DIY Speakers and Subs   05-31-2015, 06:27 AM
Replies: 19
Views: 295
Posted By Bill Fitzmaurice
Twice as long. A HornResp tutorial would be...

Twice as long.
A HornResp tutorial would be best. There are examples on-line. Most horn theory dates to the 1930s and 40s, and that's pretty much what you'll find as far as books are concerned. But...
Forum: Speakers   05-31-2015, 06:09 AM
Replies: 14
Views: 194
Posted By Bill Fitzmaurice
There is no '8 ohm sound' or '6 ohm sound'. If...

There is no '8 ohm sound' or '6 ohm sound'. If you friend's speakers sound different it's because they are different.
Forum: Speakers   05-31-2015, 06:06 AM
Replies: 4
Views: 73
Posted By Bill Fitzmaurice
Most of the program material, voices for...

Most of the program material, voices for instance, comes from the center channel, so most of the time it's what you're going to hear above the level of the other speakers.
Forum: Subwoofers, Bass, and Transducers   05-30-2015, 07:54 PM
Replies: 380
Views: 10,318
Posted By Bill Fitzmaurice
Not to nitpick, but a few points must be...

Not to nitpick, but a few points must be clarified. First, co-located is not an acoustical engineering term. It's mainly a computer term, and refers to having various pieces of gear located in the...
Forum: Subwoofers, Bass, and Transducers   05-30-2015, 07:07 PM
Replies: 18
Views: 238
Posted By Bill Fitzmaurice
14ga for 15 amps, 12ga for 20 amps. An amp will...

14ga for 15 amps, 12ga for 20 amps. An amp will clip when the power supply rails can't meet the demand, and that can happen with a too small supply wire.
Forum: Subwoofers, Bass, and Transducers   05-30-2015, 04:38 PM
Replies: 18
Views: 238
Posted By Bill Fitzmaurice
Because it doesn't have enough voltage and/or...

Because it doesn't have enough voltage and/or current available. It would take a really crappy extension for that to happen, like 18 gauge, assuming it's not 50 feet long.
Forum: DIY Speakers and Subs   05-30-2015, 09:49 AM
Replies: 19
Views: 295
Posted By Bill Fitzmaurice
There is none. The low frequency knee is...

There is none. The low frequency knee is primarily determined by the horn length, the sensitivity at the horn knee primarily by the mouth area. But as for box size there are many other variables. For...
Forum: Subwoofers, Bass, and Transducers   05-30-2015, 08:31 AM
Replies: 8
Views: 251
Posted By Bill Fitzmaurice
The main issue I see is boundary reflection...

The main issue I see is boundary reflection sourced nulls. Fixing those requires multiple subs. Don't measure at 1/48 octave, you'll drive yourself nuts trying to fix what can't be fixed and probably...
Forum: Subwoofers, Bass, and Transducers   05-30-2015, 05:52 AM
Replies: 8
Views: 251
Posted By Bill Fitzmaurice
What makes you think you need bass traps?

What makes you think you need bass traps?
Forum: DIY Speakers and Subs   05-29-2015, 07:31 AM
Replies: 19
Views: 308
Posted By Bill Fitzmaurice
You don't spray Duratex with a spray gun made for...

You don't spray Duratex with a spray gun made for paint, you use a hopper gun made for thick coatings. This is what I use:...
Forum: Subwoofers, Bass, and Transducers   05-29-2015, 05:20 AM
Replies: 14
Views: 298
Posted By Bill Fitzmaurice
That's always a necessity, with any multi-way...

That's always a necessity, with any multi-way speaker, unless the midrange and/or tweeter is of the sealed back variety.
Forum: Speakers   05-29-2015, 05:05 AM
Replies: 45
Views: 845
Posted By Bill Fitzmaurice
That argument is raised quite often, but it's got...

That argument is raised quite often, but it's got more holes in it than a slice of Swiss cheese. A tower loaded with a pair of tens will have more output capacity than a bookshelf loaded with a...
Forum: Subwoofers, Bass, and Transducers   05-28-2015, 07:38 PM
Replies: 23
Views: 527
Posted By Bill Fitzmaurice
About 105dB 'C' at the listening position will be...

About 105dB 'C' at the listening position will be felt. 110dB 'C' will give you a good pounding, 115dB 'C' will start to take your breath away. Note that's at the LP, not at 1 meter, unless the LP is...
Forum: DIY Speakers and Subs   05-28-2015, 07:25 PM
Replies: 19
Views: 308
Posted By Bill Fitzmaurice
Using both a roller and sprayer I can get orange...

Using both a roller and sprayer I can get orange peel with no thinning. With a roller use a standard paint roller, not a textured roller. With spray use a small nozzle.
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