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Search: Keyword(s): ; Posts Made By: Bill Fitzmaurice
Forum: Speakers   02-06-2016, 02:00 PM
Replies: 75
Views: 3,335
Posted By Bill Fitzmaurice
Perhaps, but when you have one 6.5 working to...

Perhaps, but when you have one 6.5 working to 160Hz and another working 160-350Hz the maximum output is 6dB less than it would be using a pair of 6.5s both working 60-350Hz. Bookshelves don't have to...
Forum: DIY Speakers and Subs   02-06-2016, 01:50 PM
Replies: 3
Views: 57
Posted By Bill Fitzmaurice
If you actually need eight twelves to handle...

If you actually need eight twelves to handle above 20Hz then it's a safe bet you'd need just as many eighteens to handle below 20Hz. Displacement and power requirements go up as frequency goes down....
Forum: Audio Theory, Setup, and Chat   02-06-2016, 01:43 PM
Replies: 2
Views: 27
Posted By Bill Fitzmaurice
+1, hire a consulting acoustical engineer. A...

+1, hire a consulting acoustical engineer. A consultant doesn't sell or install anything, he only examines the venue and then tells you what you need to do. He's got nothing to gain or lose based on...
Forum: Audio Theory, Setup, and Chat   02-06-2016, 01:34 PM
Replies: 4
Views: 62
Posted By Bill Fitzmaurice
Yeah, reading spikes versus isolation device...

Yeah, reading spikes versus isolation device advertising is kind of like watching candidate's debates. :)
Forum: DIY Speakers and Subs   02-06-2016, 10:03 AM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
I wouldn't debate that. I never said I use window...

I wouldn't debate that. I never said I use window braces, I just pointed out the wrong way and the right way to make them if you choose to do so.
Forum: Speakers   02-06-2016, 09:59 AM
Replies: 21
Views: 369
Posted By Bill Fitzmaurice
Carpeted floors, for better...

Carpeted floors, for better grip.http://www.parts-express.com/cat/speaker-cabinet-spikes/317
Forum: DIY Speakers and Subs   02-06-2016, 09:06 AM
Replies: 1
Views: 50
Posted By Bill Fitzmaurice
Look up the driver xlim/xmech, you need that...

Look up the driver xlim/xmech, you need that distance from the leading edge of the surround.
Forum: DIY Speakers and Subs   02-06-2016, 06:56 AM
Replies: 9
Views: 203
Posted By Bill Fitzmaurice
A true 1/4 wavelength TL does have a 12dB...

A true 1/4 wavelength TL does have a 12dB roll-off below the pipe frequency, like a sealed box, but with the f3 of a ported box. That seems like a benefit on the face of it, but as always there's no...
Forum: DIY Speakers and Subs   02-06-2016, 06:44 AM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
I'd like to see MDF that's 'like moist sand'....

I'd like to see MDF that's 'like moist sand'. :rolleyes:
By his description it's the equivalent of rigid foam sheet. I really have to question if he knows what MDF is.
Forum: DIY Speakers and Subs   02-05-2016, 09:02 PM
Replies: 9
Views: 203
Posted By Bill Fitzmaurice
1/4 wavelength at 25Hz is 11 feet. If you're...

1/4 wavelength at 25Hz is 11 feet. If you're going to build something that large you might as well make it a horn.
Forum: DIY Speakers and Subs   02-05-2016, 08:59 PM
Replies: 1
Views: 54
Posted By Bill Fitzmaurice
I've never found the need for anything other than...

I've never found the need for anything other than an 18dB/octave HP filter. Set to provide all the protection required you'll lose less than 5Hz of low end extension.
Forum: DIY Speakers and Subs   02-05-2016, 08:45 PM
Replies: 9
Views: 203
Posted By Bill Fitzmaurice
I wouldn't say that. Their adherents will say so,...

I wouldn't say that. Their adherents will say so, but if they didn't think it was the case they wouldn't have them. I only have two TLs in my stable of designs, the TLAH and TLAH Pro. I made them TL...
Forum: DIY Speakers and Subs   02-05-2016, 08:32 PM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
You don't need to use both.

You don't need to use both.
Forum: DIY Speakers and Subs   02-05-2016, 04:21 PM
Replies: 4
Views: 69
Posted By Bill Fitzmaurice
If that's what it is it won't do an thing....

If that's what it is it won't do an thing. There's no high frequency noise on speaker cables to reduce. Revel should know better, so I suspect it's something else.
Forum: DIY Speakers and Subs   02-05-2016, 04:14 PM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
You damp internal reflections with absorbent...

You damp internal reflections with absorbent material. Damping reflections might take an inch or two of material, which is totally different than stuffing the cab. Of course stuffing will also damp...
Forum: Audio Theory, Setup, and Chat   02-05-2016, 04:02 PM
Replies: 4
Views: 62
Posted By Bill Fitzmaurice
Nice job, but I beat you by four years. :) ...

Nice job, but I beat you by four years. :)
http://billfitzmaurice.info/forum/viewtopic.php?f=10&t=19112
Forum: DIY Speakers and Subs   02-05-2016, 01:33 PM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
I don't see the point of it. It certainly won't...

I don't see the point of it. It certainly won't make the cab panels any stiffer. I didn't directly comment on the posts you're referring to, but this was what came to mind:...
Forum: Audio Theory, Setup, and Chat   02-05-2016, 01:18 PM
Replies: 8
Views: 163
Posted By Bill Fitzmaurice
+1, but a shallow dip tends not to be a null. A...

+1, but a shallow dip tends not to be a null. A boundary reflection sourced null is going to be at least 12dB deep, whereas a 6dB dip is probably just the native response of the speaker.
Forum: DIY Speakers and Subs   02-05-2016, 10:18 AM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
Not particularly necessary for an L/C/R either....

Not particularly necessary for an L/C/R either. If the cab walls are sufficiently stiff they're not going to vibrate enough to cause a problem, no matter what their resonant frequency. If they're not...
Forum: DIY Speakers and Subs   02-05-2016, 08:32 AM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
It comes down to the level of expertise. Facebook...

It comes down to the level of expertise. Facebook car audio groups tend to be populated by younger members who don't have much in the way of engineering education and/or skills.
Forum: DIY Speakers and Subs   02-05-2016, 06:20 AM
Replies: 23
Views: 606
Posted By Bill Fitzmaurice
How do you eliminate Allison Effect with all the...

How do you eliminate Allison Effect with all the drivers in the same box?
Forum: DIY Speakers and Subs   02-05-2016, 06:16 AM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
+1. If it's a commercial box they have no...

+1.

If it's a commercial box they have no bracing because that keeps the cost down, and therefore the profit margin up. If it's a DIY it's because the builder didn't know any better.
Forum: Speakers   02-04-2016, 07:55 PM
Replies: 21
Views: 369
Posted By Bill Fitzmaurice
You can make very good, if utilitarian, stands...

You can make very good, if utilitarian, stands with 1/2" iron pipe and flanges like this:...
Forum: Speakers   02-04-2016, 07:49 PM
Replies: 2
Views: 45
Posted By Bill Fitzmaurice
The driver size is nominally the approximate...

The driver size is nominally the approximate outer diameter of the frame.
Forum: DIY Speakers and Subs   02-04-2016, 05:41 PM
Replies: 59
Views: 809
Posted By Bill Fitzmaurice
Experimenting.

Experimenting.
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