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Search: Posts Made By: Bill Fitzmaurice
Forum: Speakers   05-05-2015, 12:04 PM
Replies: 16
Views: 367
Posted By Bill Fitzmaurice
There are always harmonics. Even if they're not...

There are always harmonics. Even if they're not present in the signal the speaker itself will create them.
Forum: DIY Speakers and Subs   05-05-2015, 08:21 AM
Replies: 11
Views: 237
Posted By Bill Fitzmaurice
Mine doesn't have one. Look at the excursion...

Mine doesn't have one.
Look at the excursion chart at full power when you model the speaker and you'll see if you should have a high pass or not.
Forum: Audio Theory, Setup, and Chat   05-05-2015, 05:21 AM
Replies: 14
Views: 4,433
Posted By Bill Fitzmaurice
True, but my guess is that the OP got this sorted...

True, but my guess is that the OP got this sorted out nearly four years ago. :)
Forum: Subwoofers, Bass, and Transducers   05-04-2015, 07:21 PM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
It could. The word that describes a sub cabinet...

It could. The word that describes a sub cabinet that vibrates at low frequencies is: Defective. A well designed and constructed sub simply does not do that. To the extent that panels of a well made...
Forum: Subwoofers, Bass, and Transducers   05-04-2015, 02:58 PM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
Anything that can be heard can be measured, and...

Anything that can be heard can be measured, and anything that can't be measured can't be heard. Rattles are caused by low frequency long wavelengths sourced by the driver cone and, in the case of a...
Forum: DIY Speakers and Subs   05-04-2015, 02:46 PM
Replies: 11
Views: 237
Posted By Bill Fitzmaurice
I do, a 100 watter at that. With a high...

I do, a 100 watter at that. With a high sensitivity sub it's all I need.
Forum: Speakers   05-04-2015, 02:42 PM
Replies: 15
Views: 262
Posted By Bill Fitzmaurice
That indicates your bass management isn't...

That indicates your bass management isn't correct. The high bass content shouldn't affect the receiver or any of the speakers connected to it, only the sub.
Forum: DIY Speakers and Subs   05-04-2015, 08:18 AM
Replies: 10
Views: 121
Posted By Bill Fitzmaurice
Yes, but if you don't have a measured response...

Yes, but if you don't have a measured response chart there's no way of knowing if that will help. Before you try to fix the problem you need to narrow down exactly what it is.
Forum: Subwoofers, Bass, and Transducers   05-04-2015, 05:43 AM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
I have, and it's published. Being a professional...

I have, and it's published. Being a professional acoustical engineer by trade I'd never draw objective conclusions without doing so, as by definition without the data said conclusions would not be...
Forum: DIY Speakers and Subs   05-04-2015, 05:24 AM
Replies: 10
Views: 121
Posted By Bill Fitzmaurice
Anyone who says that doesn't know how to design...

Anyone who says that doesn't know how to design crossovers, as it's the most difficult of all the processes involved in designing a speaker. You don't say why the tweeter doesn't sound right, but...
Forum: Subwoofers, Bass, and Transducers   05-03-2015, 06:56 PM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
Dancing usually occurs with subs that have very...

Dancing usually occurs with subs that have very high mass cones, which means fiteens and larger. Down firing subs tend to have less of a problem with dancing. Push a sub across a smooth floor, and...
Forum: Audio Theory, Setup, and Chat   05-03-2015, 06:49 PM
Replies: 23
Views: 248
Posted By Bill Fitzmaurice
Optional. Direct burial wire is fine, and a lot...

Optional. Direct burial wire is fine, and a lot less expensive.
Forum: Subwoofers, Bass, and Transducers   05-03-2015, 01:34 PM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
Mechanical, in obeyence to Newtons's laws of...

Mechanical, in obeyence to Newtons's laws of motion. When the cone moves in one direction the cabinet will want to move in the opposite direction. If the coefficient of friction between the cab and...
Forum: Speakers   05-03-2015, 01:24 PM
Replies: 10
Views: 173
Posted By Bill Fitzmaurice
I break in woofers overnight, and there is...

I break in woofers overnight, and there is usually a fairly significant change in the specs, mainly Fs. I do so that be sure that when I test a cab design the results will reflect how it will work in...
Forum: Subwoofers, Bass, and Transducers   05-03-2015, 07:58 AM
Replies: 7
Views: 186
Posted By Bill Fitzmaurice
The reason is how the engineer mixed it. If he...

The reason is how the engineer mixed it. If he put most of the low content below the crossover frequency it will come out of the sub, if he put most of it above the crossover frequency it will come...
Forum: Subwoofers, Bass, and Transducers   05-03-2015, 06:54 AM
Replies: 202
Views: 13,821
Posted By Bill Fitzmaurice
In this case spikes are the better option, as...

In this case spikes are the better option, as they will grab better with carpet than feet, reducing the chances of sub dancing at high levels. If you'd prefer the look of feet that's OK too, but you...
Forum: Speakers   05-03-2015, 06:46 AM
Replies: 16
Views: 367
Posted By Bill Fitzmaurice
Google 'harmonic'. Instruments don't produce sine...

Google 'harmonic'. Instruments don't produce sine waves of a single frequency. They produce complex waveforms consisting of a fundamental tone and all of the harmonics of that tone. If said...
Forum: Speakers   05-03-2015, 06:34 AM
Replies: 14
Views: 165
Posted By Bill Fitzmaurice
If the wavelength is long enough it doesn't...

If the wavelength is long enough it doesn't matter what angle it hits the wall at, the result will be the same. OTOH if the frequency is above the baffle step there will be no reflected wave, no...
Forum: Speakers   05-02-2015, 07:01 PM
Replies: 16
Views: 367
Posted By Bill Fitzmaurice
It may go to 35Hz, but I doubt it. What you're...

It may go to 35Hz, but I doubt it. What you're probably hearing is the harmonics of 35Hz.
Forum: Speakers   05-02-2015, 06:57 PM
Replies: 14
Views: 165
Posted By Bill Fitzmaurice
It depends on the wavelength of the reflected...

It depends on the wavelength of the reflected wave, which depends on the distance out, and the position of the LP with respect to the wall behind the speakers. All easily calculated, if sufficient...
Forum: Speakers   05-02-2015, 03:10 PM
Replies: 14
Views: 165
Posted By Bill Fitzmaurice
That placement would result in a cancellation...

That placement would result in a cancellation notch centered around 170Hz. The fact that you can't place a full range floorstander where there will be no cancellation notch is one of their inherent...
Forum: Subwoofers, Bass, and Transducers   05-02-2015, 03:03 PM
Replies: 9
Views: 157
Posted By Bill Fitzmaurice
Isolation can help there, but not in the way that...

Isolation can help there, but not in the way that the advertising claims. A hollow wooden floor will vibrate when it resonates in response to the acoustic output of the sub. That vibration can be...
Forum: Subwoofers, Bass, and Transducers   05-02-2015, 02:53 PM
Replies: 10
Views: 288
Posted By Bill Fitzmaurice
+1. The same applies to concert sound systems....

+1. The same applies to concert sound systems. They go for very high SPL above 35Hz, and don't even attempt to reach much below that, due to the system size and cost requirements to do so.
Forum: DIY Speakers and Subs   05-02-2015, 02:49 PM
Replies: 14
Views: 273
Posted By Bill Fitzmaurice
That's to be expected when you build the cab that...

That's to be expected when you build the cab that narrow, as sensitivity in the low end is based on the mouth area. The best result comes if you build it a full 36 inches wide, but that's not...
Forum: Audio Theory, Setup, and Chat   05-02-2015, 02:35 PM
Replies: 45
Views: 963
Posted By Bill Fitzmaurice
+1. No matter which leg of the 220 you take for...

+1. No matter which leg of the 220 you take for the positive 110 leg the ground and neutral remain the same.

+1. That's because the level of a ground loop is proportional to the square of the...
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