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Search: Posts Made By: Bill Fitzmaurice
Forum: Speakers   08-02-2015, 02:56 PM
Replies: 4
Views: 94
Posted By Bill Fitzmaurice
Some aren't horrible, but typically they'll claim...

Some aren't horrible, but typically they'll claim that they're worth X dollars, they'll sell them to you for half that, but they're actually worth a tenth that. And some really are horrible. I've...
Forum: Subwoofers, Bass, and Transducers   08-02-2015, 10:44 AM
Replies: 2
Views: 30
Posted By Bill Fitzmaurice
+1. Assuming your sub is powered it does not use...

+1. Assuming your sub is powered it does not use banana plugs, it and the LFE output of your receiver use RCA plugs.
Forum: Audio Theory, Setup, and Chat   08-02-2015, 10:31 AM
Replies: 38
Views: 801
Posted By Bill Fitzmaurice
He was with Gibson the last I knew. Cheap DSP...

He was with Gibson the last I knew. Cheap DSP effects pretty much killed off the DIY effects market.
Forum: Speakers   08-02-2015, 10:25 AM
Replies: 15
Views: 189
Posted By Bill Fitzmaurice
Google 'Foley Stage'.

Google 'Foley Stage'.
Forum: Subwoofers, Bass, and Transducers   08-02-2015, 08:54 AM
Replies: 18
Views: 140
Posted By Bill Fitzmaurice
You'd be hard pressed to do better than the HSU...

You'd be hard pressed to do better than the HSU VTF-2 MK4 in that price range.
Forum: Audio Theory, Setup, and Chat   08-02-2015, 08:46 AM
Replies: 38
Views: 801
Posted By Bill Fitzmaurice
Yes. I built one around 1980, as I recall it was...

Yes. I built one around 1980, as I recall it was probably a Craig Anderton design. It worked more or less OK for echo, but didn't even approach the quality of a Hammond spring unit for reverb. I...
Forum: Subwoofers, Bass, and Transducers   08-02-2015, 07:36 AM
Replies: 18
Views: 140
Posted By Bill Fitzmaurice
It would be if you got four of them. :eek: It...

It would be if you got four of them. :eek:
It takes twice the driver displacement to reach one additional octave down. To simplify the calculation, the CM 10 has three 6.5 inch woofers, giving a...
Forum: Speakers   08-02-2015, 07:14 AM
Replies: 15
Views: 189
Posted By Bill Fitzmaurice
I have mine set up to sound best with broadcast...

I have mine set up to sound best with broadcast TV, as that's what I mainly watch. I find that some Blu-Rays have far more L/R and LFE content, and I sometimes have to boost the center level to get...
Forum: Speakers   08-02-2015, 06:11 AM
Replies: 15
Views: 189
Posted By Bill Fitzmaurice
It's garbage in, garbage out. If the...

It's garbage in, garbage out. If the engineer/director fouled up the mix you're going to hear a fouled up mix.
Forum: DIY Speakers and Subs   08-02-2015, 06:01 AM
Replies: 13
Views: 349
Posted By Bill Fitzmaurice
Early onset dementia? :rolleyes:

Early onset dementia? :rolleyes:
Forum: Subwoofers, Bass, and Transducers   08-01-2015, 07:19 PM
Replies: 7
Views: 109
Posted By Bill Fitzmaurice
For elevation to make any difference the sub...

For elevation to make any difference the sub would have to be a significant portion of a wavelength off the floor. With an 80Hz crossover the shortest wavelength passed by a sub is 14 feet. In short,...
Forum: Subwoofers, Bass, and Transducers   08-01-2015, 03:43 PM
Replies: 7
Views: 109
Posted By Bill Fitzmaurice
This works well, and is very inexpensive: ...

This works well, and is very inexpensive:
http://www.homedepot.com/p/TrafficMASTER-Black-24-in-x-36-in-Anti-Fatigue-Vinyl-Foam-Commercial-Mat-60-571-0900-20000300/202015909
Forum: DIY Speakers and Subs   08-01-2015, 03:38 PM
Replies: 27
Views: 333
Posted By Bill Fitzmaurice
Where wall mounting is concerned you have to be...

Where wall mounting is concerned you have to be very careful of the potential for Allison Effect cancellations. The only way to eliminate them is either flush mounting or having the cab depth less...
Forum: DIY Speakers and Subs   08-01-2015, 10:46 AM
Replies: 13
Views: 182
Posted By Bill Fitzmaurice
It wouldn't be a bad idea, as power dissipation...

It wouldn't be a bad idea, as power dissipation is minimized there, and you have to put a lot of volts in to reach xmax. OTOH you don't have to reach xmax, it just speeds up the break in if you do.
Forum: DIY Speakers and Subs   08-01-2015, 10:02 AM
Replies: 72
Views: 406
Posted By Bill Fitzmaurice
You have to consider port velocity. If it exceeds...

You have to consider port velocity. If it exceeds 20 within the sub pass band at the maximum anticipated voltage swing you have to make the area larger, along with the length.
Forum: DIY Speakers and Subs   08-01-2015, 09:53 AM
Replies: 13
Views: 182
Posted By Bill Fitzmaurice
I hadn't thought about it, as I'm usually working...

I hadn't thought about it, as I'm usually working with pro-sound drivers that have much higher Fs and a higher Pe to xmax ratio as well. With the very long xmax and low Fs of the U18 it does make...
Forum: Subwoofers, Bass, and Transducers   08-01-2015, 07:16 AM
Replies: 4
Views: 127
Posted By Bill Fitzmaurice
In a small room, where modes and reflections...

In a small room, where modes and reflections dominate the result, the spacing of subs tends to be a minor issue. It's only a major concern where the room is large enough that the primary source heard...
Forum: Audio Theory, Setup, and Chat   08-01-2015, 07:11 AM
Replies: 38
Views: 801
Posted By Bill Fitzmaurice
The older the studio the less dry it's likely to...

The older the studio the less dry it's likely to be. Before DSP it was common to use not only lively rooms but also multiple mics at different positions to give the desired ambiance. An extreme, but...
Forum: DIY Speakers and Subs   08-01-2015, 05:38 AM
Replies: 13
Views: 182
Posted By Bill Fitzmaurice
When deciding on a safe input voltage the main...

When deciding on a safe input voltage the main concern isn't the rated Pe of the driver. You want to model the driver in a sealed box, making the box size 100 cu ft or more, which more or less...
Forum: DIY Speakers and Subs   07-31-2015, 03:43 PM
Replies: 15
Views: 270
Posted By Bill Fitzmaurice
This is a starting place: ...

This is a starting place:
http://techtalk.parts-express.com/showthread.php?219617-The-Speaker-Building-Bible
Forum: Speakers   07-31-2015, 03:36 PM
Replies: 7
Views: 199
Posted By Bill Fitzmaurice
The improvement would mainly be in the 80-300Hz...

The improvement would mainly be in the 80-300Hz region, although the mid driver would get some relief and therefore it could also go louder. But the tweeter would limit how loud you could go, being...
Forum: DIY Speakers and Subs   07-31-2015, 11:13 AM
Replies: 27
Views: 333
Posted By Bill Fitzmaurice
Ideally you'd reconfigure the crossovers to...

Ideally you'd reconfigure the crossovers to remove the BSC.
Forum: Speakers   07-31-2015, 11:09 AM
Replies: 7
Views: 199
Posted By Bill Fitzmaurice
That depends on the crossover point in the Studio...

That depends on the crossover point in the Studio 100s between the woofers and the midbass. If it was 80Hz then it would offer no better result than the Studio 20 used with subs also crossed at 80Hz....
Forum: DIY Speakers and Subs   07-31-2015, 07:47 AM
Replies: 34
Views: 464
Posted By Bill Fitzmaurice
If that's the case then they're not wired as...

If that's the case then they're not wired as shown. If wired as shown each driver will drop the same voltage and will have the same excursion.
...
Forum: DIY Speakers and Subs   07-31-2015, 05:48 AM
Replies: 15
Views: 270
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...
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