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Search: Posts Made By: Bill Fitzmaurice
Forum: DIY Speakers and Subs   07-31-2015, 05:48 AM
Replies: 7
Views: 80
Posted By Bill Fitzmaurice
Driver Qes, Qms, Fs, Vas, Sd, xmax, Pe, Le and Re...

Driver Qes, Qms, Fs, Vas, Sd, xmax, Pe, Le and Re must be employed when considering replacement options, using speaker modeling software to calculate the result. You'd also have to know those specs...
Forum: Audio Theory, Setup, and Chat   07-31-2015, 05:33 AM
Replies: 41
Views: 3,614
Posted By Bill Fitzmaurice
Two pieces of advice for newbies. First, before...

Two pieces of advice for newbies. First, before posting a reply make sure you read the entire thread to be sure that what you want to say is relevant to the discussion. In this case it isn't. Second,...
Forum: Speakers   07-31-2015, 05:19 AM
Replies: 2
Views: 46
Posted By Bill Fitzmaurice
It would. There is a potential advantage to some...

It would. There is a potential advantage to some floor standers versus some bookshelves in the maximum output in the midbass, which is related to the driver displacement. For instance, a floor...
Forum: Subwoofers, Bass, and Transducers   07-30-2015, 07:08 PM
Replies: 38
Views: 294
Posted By Bill Fitzmaurice
It won't change the distance from the LP to the...

It won't change the distance from the LP to the rear wall.
Cancellations resulting from the distance of both the subs and the LP from boundaries are the main source of response nulls. They're at...
Forum: Subwoofers, Bass, and Transducers   07-30-2015, 03:31 PM
Replies: 38
Views: 294
Posted By Bill Fitzmaurice
A 60Hz cancellation is often the result of the LP...

A 60Hz cancellation is often the result of the LP being roughly 5 feet from the rear wall. That's a very common scenario. Having the LP anywhere between 3.5 and 14 feet from the rear wall pretty much...
Forum: Subwoofers, Bass, and Transducers   07-30-2015, 01:47 PM
Replies: 38
Views: 294
Posted By Bill Fitzmaurice
A lot. For one thing a good deal of the energy...

A lot. For one thing a good deal of the energy from electric bass is centered at 60Hz, as is the 2nd and 3rd harmonic content of much of the LFE track.
Forum: DIY Speakers and Subs   07-30-2015, 08:04 AM
Replies: 22
Views: 399
Posted By Bill Fitzmaurice
When I measure Fs to be accurate the driver must...

When I measure Fs to be accurate the driver must be away from boundaries. I do that by using wire to hang it from a rafter. You could do the same for break in, if your shop has a rafter that you can...
Forum: DIY Speakers and Subs   07-30-2015, 05:29 AM
Replies: 14
Views: 283
Posted By Bill Fitzmaurice
That's a textbook example of how not to make a...

That's a textbook example of how not to make a listening room or HT. Gymnasium acoustics are pretty much guaranteed, and you'll get no cabin gain.
That could be the voice coil hitting the...
Forum: Audio Theory, Setup, and Chat   07-30-2015, 05:17 AM
Replies: 23
Views: 536
Posted By Bill Fitzmaurice
You can use that technique to record in the same...

You can use that technique to record in the same fashion that the ears hear, but the all important signal processor that is the brain is still missing from the equation. This is why recording studios...
Forum: Speakers   07-29-2015, 02:22 PM
Replies: 13
Views: 327
Posted By Bill Fitzmaurice
That, and if brains were dynamite most people...

That, and if brains were dynamite most people couldn't blow their own nose. :rolleyes:
Forum: Speakers   07-29-2015, 02:19 PM
Replies: 4
Views: 58
Posted By Bill Fitzmaurice
If only the tweeter can be aimed then only the...

If only the tweeter can be aimed then only the high frequencies can be aimed. The midrange requires aiming just as much as the highs do.
Forum: Audio Theory, Setup, and Chat   07-29-2015, 09:18 AM
Replies: 3
Views: 97
Posted By Bill Fitzmaurice
If this happened by switching polarity of just...

If this happened by switching polarity of just one speaker that indicates they were out of polarity to begin with. If you switched the polarity of both the only difference that would be heard is...
Forum: DIY Speakers and Subs   07-29-2015, 04:42 AM
Replies: 19
Views: 431
Posted By Bill Fitzmaurice
Whatever it takes. Usually three or four inches,...

Whatever it takes. Usually three or four inches, much further out and no additional loading will occur.
Forum: DIY Speakers and Subs   07-28-2015, 07:41 PM
Replies: 19
Views: 431
Posted By Bill Fitzmaurice
I'm not surprised. If the cabinet is large enough...

I'm not surprised. If the cabinet is large enough aiming away from the wall can result in the baffle being 1/4 wavelength away, causing a response dip. When aimed at the wall if the distance is close...
Forum: DIY Speakers and Subs   07-28-2015, 07:30 PM
Replies: 22
Views: 399
Posted By Bill Fitzmaurice
I break in drivers putting them on my workbench,...

I break in drivers putting them on my workbench, feeding them a low frequency sinewave, lower than the driver Fs, with just enough voltage to push the cone to a bit below xmax, running it overnight....
Forum: Audio Theory, Setup, and Chat   07-28-2015, 07:21 PM
Replies: 23
Views: 536
Posted By Bill Fitzmaurice
The ear and a microphone are very similar in...

The ear and a microphone are very similar in their function. What's different is what happens when you hear a live source, versus what happens when a microphone is employed to record a live source....
Forum: Speakers   07-28-2015, 02:10 PM
Replies: 16
Views: 3,440
Posted By Bill Fitzmaurice
If the CTC is nine inches, which is one...

If the CTC is nine inches, which is one wavelength at 1.5kHz, then you will need to crossover no higher than 1.5kHz to have no lobing. The size of the tweeter required to allow the midbasses to have...
Forum: Speakers   07-28-2015, 01:50 PM
Replies: 25
Views: 407
Posted By Bill Fitzmaurice
+1. Have a look here: ...

+1. Have a look here:
http://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&SearchText=loudspeaker (http://www.alibaba.com/countrysearch/CN/loudspeaker.html)

Not only can you find...
Forum: Subwoofers, Bass, and Transducers   07-28-2015, 06:26 AM
Replies: 18
Views: 246
Posted By Bill Fitzmaurice
You'll get more responses in the appropriate...

You'll get more responses in the appropriate forum,
http://www.avsforum.com/forum/91-audio-theory-setup-chat/
Forum: Audio Theory, Setup, and Chat   07-28-2015, 05:32 AM
Replies: 23
Views: 536
Posted By Bill Fitzmaurice
So do tympanic membranes. :rolleyes: +1.

So do tympanic membranes. :rolleyes:

+1.
Forum: Speakers   07-28-2015, 05:22 AM
Replies: 2
Views: 60
Posted By Bill Fitzmaurice
Do a forum search of 'ground loop'. This is a...

Do a forum search of 'ground loop'. This is a frequent topic. Also, read this:
http://www.rane.com/note110.html
Forum: Speakers   07-27-2015, 07:59 PM
Replies: 18
Views: 264
Posted By Bill Fitzmaurice
You're close. For the most part what we concern...

You're close. For the most part what we concern ourselves with respect to quantifying sensitivity is axial response. Power response takes into consideration the total power radiated at all...
Forum: Speakers   07-27-2015, 03:13 PM
Replies: 1
Views: 47
Posted By Bill Fitzmaurice
Put a Speakon connector on one and and whatever...

Put a Speakon connector on one and and whatever the amp uses on the other.

That would be in the speaker owner's manual. If the speakers are the same they'd use the same pin connections.
Forum: Speakers   07-27-2015, 03:10 PM
Replies: 18
Views: 264
Posted By Bill Fitzmaurice
Look at their measured SPL charts and impedance...

Look at their measured SPL charts and impedance charts. If there aren't any then their claimed specs are suspect at best. Klipsch for one has been documented time and time again by reputable 3rd...
Forum: Speakers   07-27-2015, 11:27 AM
Replies: 102
Views: 41,424
Posted By Bill Fitzmaurice
That will usually be the case, as the supply is...

That will usually be the case, as the supply is 110v, while 100 watts into a 4 ohm load is 20v. Thus a draw of 200w from the wall is 1.8 amperes, while a 100w draw from the amp output is 5 amperes. ...
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