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Forum: Speakers   12-22-2014, 06:38 AM
Replies: 5
Views: 52
Posted By Bill Fitzmaurice
Yes. It's actually a fairly simple matter, you...

Yes. It's actually a fairly simple matter, you just place the midbasses no more than 1 wavelength apart center to center at the crossover frequency. Since they cross over to the BMR extended...
Forum: Subwoofers, Bass, and Transducers   12-21-2014, 08:15 PM
Replies: 3
Views: 94
Posted By Bill Fitzmaurice
90dB at 30Hz from an eight inch sub or an...

90dB at 30Hz from an eight inch sub or an eighteen inch sub will sound exactly the same both within your room and within the room below yours.
Forum: Speakers   12-21-2014, 07:57 PM
Replies: 7
Views: 124
Posted By Bill Fitzmaurice
No. ;)

No. ;)
Forum: DIY Speakers and Subs   12-21-2014, 02:59 PM
Replies: 14
Views: 804
Posted By Bill Fitzmaurice
Did you happen to check the date on the post that...

Did you happen to check the date on the post that you replied to? :confused:
Forum: DIY Speakers and Subs   12-21-2014, 07:34 AM
Replies: 9
Views: 255
Posted By Bill Fitzmaurice
FWIW the primary difference between what most...

FWIW the primary difference between what most manufacturers refer to as 'waveguides' and horns is the name. All horns are waveguides, and the vast majority of waveguides are horns. Woofers with...
Forum: Subwoofers, Bass, and Transducers   12-20-2014, 07:25 PM
Replies: 3
Views: 94
Posted By Bill Fitzmaurice
Save your money, it won't make any difference....

Save your money, it won't make any difference. What passes through the floor is long wavelength low frequency sound waves. Their source is the cone of the woofer driver. Putting something between the...
Forum: DIY Speakers and Subs   12-20-2014, 07:18 PM
Replies: 9
Views: 255
Posted By Bill Fitzmaurice
In a word, diffraction, which can cause response...

In a word, diffraction, which can cause response issues.
Forum: Subwoofers, Bass, and Transducers   12-20-2014, 02:48 PM
Replies: 3
Views: 31
Posted By Bill Fitzmaurice
Does it have a power cord? If not it's a passive...

Does it have a power cord? If not it's a passive sub, requiring its own amplifier.
Forum: DIY Speakers and Subs   12-20-2014, 02:41 PM
Replies: 71
Views: 837
Posted By Bill Fitzmaurice
In posts #41...

In posts #41 (http://www.avsforum.com/forum/usertag.php?do=list&action=hash&hash=41) and #50 (http://www.avsforum.com/forum/usertag.php?do=list&action=hash&hash=50) , to be precise.
Measuring at 1...
Forum: Subwoofers, Bass, and Transducers   12-20-2014, 10:21 AM
Replies: 9
Views: 132
Posted By Bill Fitzmaurice
How do you match the power level when the input...

How do you match the power level when the input voltage is an unknown? And how do you account for amplifier headroom? Any well designed sub will have an amp with sufficient control over its input...
Forum: Subwoofers, Bass, and Transducers   12-19-2014, 08:56 PM
Replies: 9
Views: 132
Posted By Bill Fitzmaurice
Any sub will bottom out if it's driven beyond the...

Any sub will bottom out if it's driven beyond the driver's excursion capability.
However:

That probably indicates a bad volume pot. Instead of regulating the volume it may be either full off or...
Forum: DIY Speakers and Subs   12-19-2014, 05:22 PM
Replies: 71
Views: 837
Posted By Bill Fitzmaurice
+1. I've already posted how to do so, at least...

+1. I've already posted how to do so, at least twice. ;)
Forum: Subwoofers, Bass, and Transducers   12-19-2014, 03:21 PM
Replies: 3
Views: 60
Posted By Bill Fitzmaurice
There can't be a ground loop unless there are two...

There can't be a ground loop unless there are two or more connections to ground, typically via the AC cord and the interconnect. Since you have hum with only the AC plugged in the source of the noise...
Forum: Speakers   12-19-2014, 03:12 PM
Replies: 110
Views: 6,636
Posted By Bill Fitzmaurice
http://www.youtube.com/watch?v=FdghRwWfaOQ&feature...

http://www.youtube.com/watch?v=FdghRwWfaOQ&feature=related
Forum: DIY Speakers and Subs   12-19-2014, 01:29 PM
Replies: 71
Views: 837
Posted By Bill Fitzmaurice
Not much, you can get that same result with a...

Not much, you can get that same result with a variety of tunings, depending on the particular driver specs and cab size. For that matter you could see that result from a sealed alignment or horn. If...
Forum: DIY Speakers and Subs   12-19-2014, 10:17 AM
Replies: 22
Views: 418
Posted By Bill Fitzmaurice
So is the current draw of the amp. Simply...

So is the current draw of the amp. Simply plugging the amp into a circuit that you've verified is not on the same circuit would probably reveal if that's the problem.
Forum: DIY Speakers and Subs   12-19-2014, 10:13 AM
Replies: 441
Views: 10,216
Posted By Bill Fitzmaurice
What's incorrect? Dual opposed keeps subs from...

What's incorrect? Dual opposed keeps subs from dancing at high levels. It doesn't affect vibration of the cab panels, as suggested by some, but that's not what he wrote.
Cabinet leakage losses are...
Forum: DIY Speakers and Subs   12-19-2014, 10:03 AM
Replies: 71
Views: 837
Posted By Bill Fitzmaurice
With an impedance sweep. If you lack that...

With an impedance sweep. If you lack that capability do the old rice dance trick. Put the cab face up, put some rice on the cone, do a low frequency sine wave sweep. Cone excursion, and therefore the...
Forum: DIY Speakers and Subs   12-19-2014, 06:29 AM
Replies: 22
Views: 418
Posted By Bill Fitzmaurice
If you're going to power something on its own...

If you're going to power something on its own circuit it should be the power amp.
Forum: Audio Theory, Setup, and Chat   12-19-2014, 06:24 AM
Replies: 6
Views: 79
Posted By Bill Fitzmaurice
Based on what? If it's real world measured...

Based on what? If it's real world measured performance that's one thing, if it's advertising that's something else again. When digital first hit the scene 30 odd years ago there were substantial...
Forum: Audio Theory, Setup, and Chat   12-19-2014, 06:15 AM
Replies: 2
Views: 53
Posted By Bill Fitzmaurice
Don't. If you lack enough current capacity that's...

Don't. If you lack enough current capacity that's a matter of adding another branch circuit. The first thing I'd do is to plug all of the high current gear direct to the wall, gizmos like the Panamax...
Forum: DIY Speakers and Subs   12-18-2014, 07:59 PM
Replies: 71
Views: 837
Posted By Bill Fitzmaurice
Impedance is an electrical measurement, not an...

Impedance is an electrical measurement, not an acoustical measurement. It can be done with a sine wave generator, amp, DMM and a specialized resistor bridge. I use a WT 3. ...
Forum: DIY Speakers and Subs   12-18-2014, 07:54 PM
Replies: 22
Views: 418
Posted By Bill Fitzmaurice
I'm not experienced in whether or not that could...

I'm not experienced in whether or not that could be caused by the TV being voltage or current starved, but I'd say that's a more likely explanation than low frequency waves. If they could cause that...
Forum: Speakers   12-18-2014, 02:21 PM
Replies: 2
Views: 50
Posted By Bill Fitzmaurice
JBL Parts and accessories: 1-800-336-4525

JBL Parts and accessories: 1-800-336-4525
Forum: DIY Speakers and Subs   12-18-2014, 02:12 PM
Replies: 22
Views: 418
Posted By Bill Fitzmaurice
If the only change to the system is the amp then...

If the only change to the system is the amp then it's possible the amp is causing the TV to be current starved, especially if they're plugged into the same outlet. Even if they aren't they may still...
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