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Search: Posts Made By: Bill Fitzmaurice
Forum: Subwoofers, Bass, and Transducers   08-03-2015, 05:38 AM
Replies: 5
Views: 64
Posted By Bill Fitzmaurice
For one thing you can make them to an exact...

For one thing you can make them to an exact length.
Forum: DIY Speakers and Subs   08-03-2015, 05:34 AM
Replies: 14
Views: 401
Posted By Bill Fitzmaurice
Not really. All of my DIY horn designs can be...

Not really. All of my DIY horn designs can be built by first timers, with no more than a circular saw, jig saw and drill. They can be, because they were designed to be, and to be sure it could be...
Forum: DIY Speakers and Subs   08-03-2015, 05:05 AM
Replies: 6
Views: 58
Posted By Bill Fitzmaurice
As is the case with any and all drivers you can't...

As is the case with any and all drivers you can't just stick the Ci200rr into a box of arbitrary size and configuration and expect a good result, you must match the driver to an enclosure design...
Forum: Speakers   08-02-2015, 02:56 PM
Replies: 5
Views: 140
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: 5
Views: 64
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: 39
Views: 836
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: 197
Posted By Bill Fitzmaurice
Google 'Foley Stage'.

Google 'Foley Stage'.
Forum: Subwoofers, Bass, and Transducers   08-02-2015, 08:54 AM
Replies: 18
Views: 146
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: 39
Views: 836
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: 146
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: 197
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: 197
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: 14
Views: 401
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: 113
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: 113
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: 30
Views: 382
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: 183
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: 419
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: 183
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: 130
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: 39
Views: 836
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: 183
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: 273
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: 30
Views: 382
Posted By Bill Fitzmaurice
Ideally you'd reconfigure the crossovers to...

Ideally you'd reconfigure the crossovers to remove the BSC.
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