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Forum: Subwoofers, Bass, and Transducers   12-17-2014, 01:35 PM
Replies: 19
Views: 220
Posted By Bill Fitzmaurice
That's not true, and saying so does nothing to...

That's not true, and saying so does nothing to aid the OP. The only advantage to sealed is that they don't go as low as ported, with f3 of 35-40Hz being common. If the room is small enough, with a...
Forum: Subwoofers, Bass, and Transducers   12-17-2014, 12:22 PM
Replies: 19
Views: 220
Posted By Bill Fitzmaurice
Not necessarily. Once you introduce room...

Not necessarily. Once you introduce room interactions, including but not limited to boundary effects and cabin gain, you can end up with more low end than an anechoic measurement predicts, especially...
Forum: DIY Speakers and Subs   12-17-2014, 10:14 AM
Replies: 3
Views: 56
Posted By Bill Fitzmaurice
You can re-purpose PA cabs with subwoofer...

You can re-purpose PA cabs with subwoofer drivers, but only if you software model the driver/cab combination and make the necessary adjustments to the port size/box tuning. Since the PA cabs are...
Forum: DIY Speakers and Subs   12-17-2014, 10:09 AM
Replies: 32
Views: 341
Posted By Bill Fitzmaurice
That depends. At the edges of a port, within 1/4...

That depends. At the edges of a port, within 1/4 inch or so, there's a lot of friction between the air mass within the port and the port walls. That occurs with all port shapes and locations. What...
Forum: Subwoofers, Bass, and Transducers   12-17-2014, 06:40 AM
Replies: 19
Views: 220
Posted By Bill Fitzmaurice
You don't want to accentuate anything. What you...

You don't want to accentuate anything. What you want is for the system to accurately reproduce the sound track content.
Forum: DIY Speakers and Subs   12-17-2014, 06:35 AM
Replies: 32
Views: 341
Posted By Bill Fitzmaurice
These, and the subsequent questions, are why you...

These, and the subsequent questions, are why you should learn the nuts and bolts of speaker building by using a tried and tested design that already has these and all the other design and...
Forum: Speakers   12-16-2014, 08:32 PM
Replies: 11
Views: 152
Posted By Bill Fitzmaurice
Where are your subs? A major issue with respect...

Where are your subs?
A major issue with respect to placement is Allison Effect, a dip in response where the reflected wave off the wall behind the speakers meets the original wave 180 degrees out of...
Forum: Speakers   12-16-2014, 08:22 PM
Replies: 11
Views: 138
Posted By Bill Fitzmaurice
+1. Every now and then you see someone using...

+1. Every now and then you see someone using resonant panels, justifying the concept by saying that they do the same thing that soundboards do in pianos, or that tone woods do with stringed...
Forum: Subwoofers, Bass, and Transducers   12-16-2014, 01:54 PM
Replies: 3
Views: 81
Posted By Bill Fitzmaurice
It will reduce the net cabinet size, exclusive of...

It will reduce the net cabinet size, exclusive of the drivers, the ports and the plenum chamber between the drivers, by 1/2. It also results in the two drivers giving the same output as only one in a...
Forum: DIY Speakers and Subs   12-16-2014, 01:49 PM
Replies: 10
Views: 192
Posted By Bill Fitzmaurice
Cone area is moot, displacement is what matters....

Cone area is moot, displacement is what matters. You can find some tens that have more displacement than some eighteens. But if the cab is too small to allow the driver to work with adequate...
Forum: Subwoofers, Bass, and Transducers   12-16-2014, 09:24 AM
Replies: 16
Views: 455
Posted By Bill Fitzmaurice
If the system is correctly set up localization of...

If the system is correctly set up localization of the sub isn't an issue. My sub is a foot behind me, my mains 12 feet in front of me. I can't localize it. The only benefit to having a sub by the...
Forum: DIY Speakers and Subs   12-16-2014, 09:19 AM
Replies: 10
Views: 192
Posted By Bill Fitzmaurice
What you need to be looking at is a speaker...

What you need to be looking at is a speaker capable of delivering the response and output that you want. That has far more to do with the size of the enclosure than it does the size of the driver.
Forum: Subwoofers, Bass, and Transducers   12-16-2014, 07:46 AM
Replies: 16
Views: 455
Posted By Bill Fitzmaurice
Where the behavior of sound waves is concerned...

Where the behavior of sound waves is concerned intuition is usually wrong. That's doubly true of low frequency long wavelength sound waves.

No competent engineer would ever make that statement....
Forum: DIY Speakers and Subs   12-16-2014, 07:37 AM
Replies: 10
Views: 192
Posted By Bill Fitzmaurice
It's way beyond excessive. Every 6dB of EQ...

It's way beyond excessive. Every 6dB of EQ doubles excursion and quadruples amplifier power demand. Having to boost by more than 6dB anywhere within the passband indicates a problem, probably...
Forum: DIY Speakers and Subs   12-15-2014, 08:31 PM
Replies: 13
Views: 124
Posted By Bill Fitzmaurice
Changing the box size doesn't affect the tuning...

Changing the box size doesn't affect the tuning because when you change the box size the program changes the port dimensions to maintain the tuning at the chosen value. By the same token changing the...
Forum: Audio Theory, Setup, and Chat   12-15-2014, 01:01 PM
Replies: 21
Views: 216
Posted By Bill Fitzmaurice
Multiple subs.

Multiple subs.
Forum: Speakers   12-15-2014, 12:58 PM
Replies: 10
Views: 166
Posted By Bill Fitzmaurice
This will help to explain. It deals with passive...

This will help to explain. It deals with passive crossovers, but the main difference is that passives are post-amplification, actives are pre-amplification.
http://www.bcae1.com/xoorder.htm
Forum: Speakers   12-15-2014, 12:54 PM
Replies: 13
Views: 296
Posted By Bill Fitzmaurice
It wouldn't be the first time that someone...

It wouldn't be the first time that someone assumed that the 105dB part of the equation meant that one actually listens at 105dB. All that it means is that the system is capable of reaching 105dB on...
Forum: Subwoofers, Bass, and Transducers   12-15-2014, 10:29 AM
Replies: 16
Views: 455
Posted By Bill Fitzmaurice
Firing at a wall or at a floor is the same thing,...

Firing at a wall or at a floor is the same thing, rotated 90 degrees.
Forum: DIY Speakers and Subs   12-15-2014, 10:27 AM
Replies: 15
Views: 318
Posted By Bill Fitzmaurice
I've seen pictures of a concrete foundation crack...

I've seen pictures of a concrete foundation crack caused by a Tuba HT, so don't underestimate the power of a horn loaded sub to do serious damage.
Forum: Audio Theory, Setup, and Chat   12-15-2014, 10:24 AM
Replies: 21
Views: 216
Posted By Bill Fitzmaurice
http://www.realtraps.com/articles.htm

http://www.realtraps.com/articles.htm
Forum: Speakers   12-15-2014, 10:21 AM
Replies: 10
Views: 166
Posted By Bill Fitzmaurice
These are common in pro-sound, they're called...

These are common in pro-sound, they're called powered speakers. Many have on-board DSP, and many of those allow user adjustment of the DSP. The latter configuration is becoming popular in DIY, using...
Forum: Speakers   12-15-2014, 06:35 AM
Replies: 7
Views: 123
Posted By Bill Fitzmaurice
In other words, got no highs, got no lows. Seems...

In other words, got no highs, got no lows. Seems that I've heard that before. :rolleyes:
Forum: Audio Theory, Setup, and Chat   12-14-2014, 07:14 PM
Replies: 3
Views: 54
Posted By Bill Fitzmaurice
It won't hurt, damping some reflections that...

It won't hurt, damping some reflections that contribute to Allison Effect cancellations, but it would have to be quite large to damp them all.
Forum: Speakers   12-14-2014, 07:10 PM
Replies: 28
Views: 276
Posted By Bill Fitzmaurice
Better yet, hire a DJ. He'll provide the PA. :)

Better yet, hire a DJ. He'll provide the PA. :)
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