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Search: Posts Made By: Bill Fitzmaurice
Forum: Audio Theory, Setup, and Chat   08-29-2015, 11:43 AM
Replies: 12
Views: 99
Posted By Bill Fitzmaurice
The shield for a balanced (two conductor plus...

The shield for a balanced (two conductor plus shield) mic cable doesn't carry current when used as a mic cord. However, that doesn't mean it's incapable of doing so. Should one use the conductors for...
Forum: DIY Speakers and Subs   08-29-2015, 09:58 AM
Replies: 9
Views: 99
Posted By Bill Fitzmaurice
http://www.bcae1.com/images/swfs/speakerwireselect...

http://www.bcae1.com/images/swfs/speakerwireselectorassistant.swf
Forum: DIY Speakers and Subs   08-29-2015, 09:56 AM
Replies: 3
Views: 57
Posted By Bill Fitzmaurice
See: Comb Filtering. To prevent it drivers must...

See: Comb Filtering. To prevent it drivers must be less than 1 wavelength apart center to center. Even when that's the case the angle of dispersion on the horizontal plane will be halved compared to...
Forum: Audio Theory, Setup, and Chat   08-29-2015, 09:51 AM
Replies: 12
Views: 99
Posted By Bill Fitzmaurice
It's plenty, as the current delivery to...

It's plenty, as the current delivery to headphones is slight. Capacitance isn't an issue either, due to the high impedance load of headphones.
Forum: DIY Speakers and Subs   08-29-2015, 06:40 AM
Replies: 9
Views: 99
Posted By Bill Fitzmaurice
You are. ;)

You are. ;)
Forum: DIY Speakers and Subs   08-28-2015, 02:41 PM
Replies: 11
Views: 294
Posted By Bill Fitzmaurice
In part. Excursion goes up as frequency goes...

In part. Excursion goes up as frequency goes down, be it ported or sealed. Below Fb a ported box excursion will go up at a faster rate than sealed. That can give sealed an advantage, but where subs...
Forum: Audio Theory, Setup, and Chat   08-28-2015, 02:30 PM
Replies: 11
Views: 126
Posted By Bill Fitzmaurice
+/-1.5dB is close enough. For that matter +/- 3dB...

+/-1.5dB is close enough. For that matter +/- 3dB is considered as close to flat as one really needs. That's why you have a master volume control on the sub, as well as trim control in the AVR. Turn...
Forum: Audio Theory, Setup, and Chat   08-28-2015, 11:32 AM
Replies: 11
Views: 126
Posted By Bill Fitzmaurice
The SVS advice is odd, typically you want the...

The SVS advice is odd, typically you want the same level across the board. At any rate, you only need to use two bands of EQ on the sub, 30 and 40Hz. Take them both down to 72dB. That makes your sub...
Forum: Subwoofers, Bass, and Transducers   08-28-2015, 05:01 AM
Replies: 31
Views: 630
Posted By Bill Fitzmaurice
FWIW there's no such thing as imaging in the...

FWIW there's no such thing as imaging in the subwoofer frequency band width, so whatever it is that you're having issues with it's not imaging.
Agreed.
Forum: Subwoofers, Bass, and Transducers   08-28-2015, 04:52 AM
Replies: 1
Views: 66
Posted By Bill Fitzmaurice
If the sub buzzes when it's plugged into the wall...

If the sub buzzes when it's plugged into the wall but there is no input cable plugged into it the sub is defective.
Forum: Subwoofers, Bass, and Transducers   08-27-2015, 03:17 PM
Replies: 4
Views: 123
Posted By Bill Fitzmaurice
The original foams only lasted about 15-20 years,...

The original foams only lasted about 15-20 years, and started disintegrating in the 80s, so that's when the formulations were changed. I was re-foaming drivers in 1982. Anything from the late 80s or...
Forum: DIY Speakers and Subs   08-27-2015, 08:05 AM
Replies: 28
Views: 553
Posted By Bill Fitzmaurice
Man cave, where you can do what you want. :D ...

Man cave, where you can do what you want. :D
DIY subs tend to be larger than commercial, because the average DIYer understands how speakers work and will build them as large as they need to be to...
Forum: Speakers   08-27-2015, 05:34 AM
Replies: 68
Views: 1,132
Posted By Bill Fitzmaurice
Hoffman's Iron Law. It trades off low frequency...

Hoffman's Iron Law. It trades off low frequency extension for high sensitivity.
Forum: Subwoofers, Bass, and Transducers   08-27-2015, 05:30 AM
Replies: 16
Views: 174
Posted By Bill Fitzmaurice
The major problem with long wire connections to...

The major problem with long wire connections to subs is the potential for ground loop noise, as that noise increases proportionally to the wire length squared. Wireless is immune to ground looping,...
Forum: DIY Speakers and Subs   08-27-2015, 05:21 AM
Replies: 11
Views: 294
Posted By Bill Fitzmaurice
That's not the case. The enclosure acts like a...

That's not the case. The enclosure acts like a storage capacitor, delaying the port output sufficiently so that it's in phase with the driver output at and above Fb. Only below Fb is port radiation...
Forum: DIY Speakers and Subs   08-26-2015, 08:01 PM
Replies: 11
Views: 294
Posted By Bill Fitzmaurice
Yes. Both. Peak port output is at the tuning...

Yes. Both.
Peak port output is at the tuning frequency, extending on average 1/3 octave above and below the tuning frequency. Minimum cone excursion is at that same frequency.
That's not bad...
Forum: Subwoofers, Bass, and Transducers   08-26-2015, 03:06 PM
Replies: 13
Views: 241
Posted By Bill Fitzmaurice
Without seeing all of the pertinent driver data...

Without seeing all of the pertinent driver data one can't say for sure, but what's shown in the above graph probably reflects the excursion limit of the driver. At low frequencies that limit is...
Forum: Speakers   08-26-2015, 01:26 PM
Replies: 8
Views: 148
Posted By Bill Fitzmaurice
If you do that chances are the Atmos content will...

If you do that chances are the Atmos content will be indistinguishable from the other content.
Forum: Speakers   08-26-2015, 01:23 PM
Replies: 17
Views: 315
Posted By Bill Fitzmaurice
Those looking for used often don't do their...

Those looking for used often don't do their research. The seller will state the original MSRP, and a buyer who doesn't know that new gear typically sells for well under MSRP might thinking they're...
Forum: DIY Speakers and Subs   08-26-2015, 10:29 AM
Replies: 14
Views: 343
Posted By Bill Fitzmaurice
The OPs experience shows the benefit of...

The OPs experience shows the benefit of immediately testing, if not actually breaking in, a driver when you get it. If it's got a defect putting 25Hz at 12v into it overnight will probably bring it...
Forum: Subwoofers, Bass, and Transducers   08-25-2015, 10:26 AM
Replies: 18
Views: 201
Posted By Bill Fitzmaurice
This: ...

This:
http://www.homedepot.com/p/TrafficMASTER-Black-24-in-x-36-in-Anti-Fatigue-Vinyl-Foam-Commercial-Mat-60-571-0900-20000300/202015909
Forum: Speakers   08-25-2015, 10:21 AM
Replies: 22
Views: 299
Posted By Bill Fitzmaurice
I'm referring to the two 4 inch woofers of the...

I'm referring to the two 4 inch woofers of the Motion 8. But as far as that goes I wouldn't run the surrounds lower than 100Hz either. Four inch drivers are only capable of so much, and will easily...
Forum: Speakers   08-25-2015, 08:51 AM
Replies: 22
Views: 299
Posted By Bill Fitzmaurice
I wouldn't run a pair of fours lower than 100Hz....

I wouldn't run a pair of fours lower than 100Hz. I run fours at 80Hz, but my center has six of them, my L/R eight each.
Forum: Speakers   08-25-2015, 08:19 AM
Replies: 22
Views: 299
Posted By Bill Fitzmaurice
There will be very little change with time. Break...

There will be very little change with time. Break in primarily softens woofer surrounds and spiders, giving a bit lower extension, but the change isn't particularly noticeable. Distortion is the...
Forum: Subwoofers, Bass, and Transducers   08-25-2015, 05:09 AM
Replies: 16
Views: 432
Posted By Bill Fitzmaurice
The higher the frequency the louder it must be to...

The higher the frequency the louder it must be to have the same impact. There comes a point where there is insufficient room pressurization to give the chest thump sensation, roughly above 200Hz, no...
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