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Search: Posts Made By: Bill Fitzmaurice
Forum: Audio Theory, Setup, and Chat   09-04-2015, 09:12 AM
Replies: 1
Views: 30
Posted By Bill Fitzmaurice
Probably. A sound meter is far more trustworthy...

Probably. A sound meter is far more trustworthy than your ears, especially when your eyes get into the act.
Forum: DIY Speakers and Subs   09-03-2015, 11:25 AM
Replies: 6
Views: 184
Posted By Bill Fitzmaurice
That's fine, so long as you have no kids, pets,...

That's fine, so long as you have no kids, pets, visitors or a vacuum cleaner. Otherwise just asking for trouble you are.
Forum: Subwoofers, Bass, and Transducers   09-03-2015, 05:25 AM
Replies: 2
Views: 57
Posted By Bill Fitzmaurice
XLR/balanced line transmission eliminates the...

XLR/balanced line transmission eliminates the potential for ground loop noise, but only when both the send and receive are balanced. When you convert from XLR to RCA it's no longer a balanced line. ...
Forum: DIY Speakers and Subs   09-03-2015, 05:19 AM
Replies: 6
Views: 184
Posted By Bill Fitzmaurice
Only when the motive force of the driver cone...

Only when the motive force of the driver cone exceeds the inertial forces keeping the speaker in place. The easiest method is to increase the inertial dampening force. In other words, make the box...
Forum: Subwoofers, Bass, and Transducers   09-02-2015, 06:07 AM
Replies: 11
Views: 132
Posted By Bill Fitzmaurice
+1. I only use one sub, but I'm lucky in that my...

+1. I only use one sub, but I'm lucky in that my room is fine with it. If you are going to use more than one probably the worst thing you can do is to place them all in the front of the room, as that...
Forum: Audio Theory, Setup, and Chat   09-02-2015, 05:59 AM
Replies: 33
Views: 267
Posted By Bill Fitzmaurice
You would be. Under certain circumstances there...

You would be. Under certain circumstances there are differences in the sound of tubes versus SS, but those circumstances are almost exclusively when they're driven to clipping. That applies to...
Forum: Speakers   09-01-2015, 07:17 PM
Replies: 3
Views: 31
Posted By Bill Fitzmaurice
Probably, but the only way to know which is to...

Probably, but the only way to know which is to find the T/S specs on the originals. With those and the cabinet dimensions you would use speaker modeling software to compare other drivers.
Forum: DIY Speakers and Subs   09-01-2015, 02:06 PM
Replies: 8
Views: 176
Posted By Bill Fitzmaurice
There isn't any comb filtering, vertical arrays...

There isn't any comb filtering, vertical arrays are immune to it, unless your listening position is atop a pogo stick. She might be hearing high frequency hiss that you can't.
Forum: DIY Speakers and Subs   08-31-2015, 11:09 AM
Replies: 8
Views: 176
Posted By Bill Fitzmaurice
Look at the Maximum Power and Maximum SPL charts....

Look at the Maximum Power and Maximum SPL charts. ;)
Forum: DIY Speakers and Subs   08-31-2015, 10:05 AM
Replies: 11
Views: 305
Posted By Bill Fitzmaurice
With a Vd of 52cc each eight of those will have...

With a Vd of 52cc each eight of those will have not much more displacement than a pair of eights with Vd of 188cc each, for instance the Dayton Classic 8, while the 60Hz Fs isn't going to deliver...
Forum: Subwoofers, Bass, and Transducers   08-30-2015, 07:03 PM
Replies: 19
Views: 447
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: 19
Views: 447
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: 175
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: 111
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: 7
Views: 249
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: 111
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: 153
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: 235
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: 175
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: 153
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: 235
Posted By Bill Fitzmaurice
You are. ;)

You are. ;)
Forum: DIY Speakers and Subs   08-28-2015, 02:41 PM
Replies: 12
Views: 366
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: 17
Views: 251
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: 17
Views: 251
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: 46
Views: 1,296
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.
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