Search found 6247 matches

by Bill Fitzmaurice
Mon Sep 08, 2025 9:39 pm
Forum: Omni Bass/Key/PA Speakers
Topic: Phase plug diameter
Replies: 1
Views: 165

Re: Phase plug diameter

When I prototyped the cabs I tried various phase plug sizes for the two crossover options. What worked best is what made it into the plans.
by Bill Fitzmaurice
Mon Sep 08, 2025 6:11 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Is it possible to build a titan 48 for a 18inch driver
Replies: 6
Views: 151

Re: Is it possible to build a titan 48 for a 18inch driver

"Aerodynamics are for those who don't know how to build engines."- Enzo Ferrari
"Eighteens are for those who don't know how to build horns."- Bill Fitzmaurice
8)
by Bill Fitzmaurice
Fri Sep 05, 2025 9:47 pm
Forum: Omni Bass/Key/PA Speakers
Topic: OTop8 dispersion angle and Bi-amping
Replies: 79
Views: 6666

Re: OTop8 dispersion angle and Bi-amping

The widest dispersion comes with the melded array.
by Bill Fitzmaurice
Wed Sep 03, 2025 9:52 am
Forum: Simplexx
Topic: Simplexx 10 Driver
Replies: 1
Views: 226

Re: Simplexx 10 Driver

Flip a coin. The GRS looks like a real bargain.
by Bill Fitzmaurice
Fri Aug 29, 2025 1:31 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: ultralight plywood?
Replies: 8
Views: 215

Re: ultralight plywood?

That will work, but you double the build time, and if the panel placements aren't precise you won't be able to get the second side on. If you end up with a thin veneer use screws when assembling so you're not relying purely on the adhesive.
by Bill Fitzmaurice
Thu Aug 21, 2025 6:48 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: titan 39- should I use chamber reducers with a 10' speaker with Fs=32hz?
Replies: 2
Views: 138

Re: titan 39- should I use chamber reducers with a 10' speaker with Fs=32hz?

Chamber reducers are not used in the T39. The 10RS430 is not a recommended driver as it's far more expensive than twelves that have higher displacement.
by Bill Fitzmaurice
Wed Aug 20, 2025 2:22 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: finish on interior baffles?
Replies: 1
Views: 93

Re: finish on interior baffles?

It will make no difference. Horns don't work like guitar bodies.
by Bill Fitzmaurice
Mon Aug 18, 2025 9:05 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: High efficiency 15 in tuba ht
Replies: 5
Views: 158

Re: High efficiency 15 in tuba ht

The combination of higher Fs and lower Qes will kill the low end. There's nothing to be gained using a pro-sound driver in the THT, and much to be lost. The PD.1551nr1 isn't sub worthy, in any cab.
by Bill Fitzmaurice
Fri Aug 15, 2025 12:04 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Driver choices for a Tuba 24.
Replies: 40
Views: 6709

Re: Driver choices for a Tuba 24.

Nowhere in the plans is usable frequency mentioned because it's a red herring. What is listed is the Fs range, but what mainly determines the low frequency response of a horn is the horn, not the driver. SPL charts are posted for all the subs so you know which meet your needs and which do not.
by Bill Fitzmaurice
Thu Aug 14, 2025 6:45 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: THTLP higher frequency performance (100hz+)
Replies: 3
Views: 170

Re: THTLP higher frequency performance (100hz+)

The folds act as a low pass filter yes, but that's a good thing. It's one reason why THD is far lower than any direct radiator. However, when the distance between the panels and the bends gets longer relative to the wavelengths being passed response gets more ragged. Localization isn't an issue unle...
by Bill Fitzmaurice
Wed Aug 13, 2025 4:06 pm
Forum: Omni Bass/Key/PA Speakers
Topic: Otop12 integration
Replies: 9
Views: 201

Re: Otop12 integration

The only way to know is by testing them at a distance with and without the time align. There are factors that influence the result with close measurements. That's why I measure at no less than 2 meters, while Tom Danley measures at 10 meters.
by Bill Fitzmaurice
Tue Aug 12, 2025 8:58 pm
Forum: Omni Bass/Key/PA Speakers
Topic: Otop12 integration
Replies: 9
Views: 201

Re: Otop12 integration

Try it again at a normal listening distance.
by Bill Fitzmaurice
Tue Aug 12, 2025 4:04 pm
Forum: Omni Bass/Key/PA Speakers
Topic: Otop12 integration
Replies: 9
Views: 201

Re: Otop12 integration

Distance to the mic? Mic height? Ideally you want it on the axis where the two cabs meet. With the cabs that high and the mic relatively close you'll see some phase zits that should smooth out with distance.
by Bill Fitzmaurice
Thu Jul 31, 2025 8:37 am
Forum: Everything Else
Topic: Quality Control ???
Replies: 5
Views: 178

Re: Quality Control ???

Is it genuine Neutrik?