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Search: Posts Made By: Bill Fitzmaurice
Forum: Subwoofers, Bass, and Transducers   08-30-2015, 07:03 PM
Replies: 18
Views: 398
Posted By Bill Fitzmaurice
Pink noise virtually duplicates the content of...

Pink noise virtually duplicates the content of normal program material. It won't damage a speaker. For that matter it's what driver and speaker manufacturers use to test with, typically at full power...
Forum: Subwoofers, Bass, and Transducers   08-30-2015, 03:21 PM
Replies: 18
Views: 398
Posted By Bill Fitzmaurice
Since that's the only speaker that your testing...

Since that's the only speaker that your testing that's the only one that should be operating. The receiver's test tone is all you need to use.
Forum: DIY Speakers and Subs   08-30-2015, 10:40 AM
Replies: 6
Views: 134
Posted By Bill Fitzmaurice
Do you consider halved a big difference? :eek: ...

Do you consider halved a big difference? :eek:
There are instances where having a narrower dispersion pattern than a single driver or vertically aligned multiple drivers is desirable, but it must be...
Forum: Speakers   08-30-2015, 10:34 AM
Replies: 9
Views: 91
Posted By Bill Fitzmaurice
It's just another way of making a connection.

It's just another way of making a connection.
Forum: Subwoofers, Bass, and Transducers   08-30-2015, 08:58 AM
Replies: 6
Views: 156
Posted By Bill Fitzmaurice
That's not out of the question. Multiple subs...

That's not out of the question. Multiple subs flatten in-room response, so the overall level required to give the same listening experience might be lower than that with a single sub. What's key is...
Forum: Speakers   08-30-2015, 08:39 AM
Replies: 9
Views: 91
Posted By Bill Fitzmaurice
Yes, but use wire nuts if they're hidden, or...

Yes, but use wire nuts if they're hidden, or solderless butt connectors if they're visible.
Forum: Audio Theory, Setup, and Chat   08-29-2015, 11:43 AM
Replies: 13
Views: 123
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: 19
Views: 202
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: 6
Views: 134
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: 13
Views: 123
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: 19
Views: 202
Posted By Bill Fitzmaurice
You are. ;)

You are. ;)
Forum: DIY Speakers and Subs   08-28-2015, 02:41 PM
Replies: 11
Views: 304
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: 146
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: 146
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: 688
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: 67
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: 126
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: 29
Views: 622
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: 79
Views: 1,484
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: 182
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: 304
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: 304
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: 243
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: 151
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: 316
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...
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