Titan 39 Build

[NukePooch]

+1
I picked up a super cheap hopper gun from Harbor Freight (think it was $19 on sale). Turn it down so it spits...sprays the normal roller grade Duratex just fine. I am cheap enough that I roll on a quick coat of flat black latex paint first.

Leland from Speaker Hardware has a great video...it's where I got the idea that I could do it.

[Bill Fitzmaurice]

About that gun, the air runs all the time, even when not spraying. That will drain the compressor tank really quick. I put an air shutoff valve on mine for between passes.

[Bryan Cox]

Yeah that does seem easier and I do like the texture options it affords. In the end, I'm happy with my result but maybe I'll pick up a hopper gun in the future. BTW, the HVLP is from Harbor Freight. Couldn't be happier with it. I'll probably spray another coat of Duratex on my first T39 just to make it more uniform.

[Bryan Cox]

The drivers, rta mic, and spl meter will be here this week. I plan to break in the drivers Thursday night and test my whole system; A4x Otop 12 (Delta Pro 12-450a) and 4x T39 (3012LF). I'll set the limiter with a 50 Hz sine wave then test at the cover frequency, 100 Hz, to check for polarity issues. Is there anything else I should think about? Anything to watch out for?

I'm a classic rock, southern rock, blues, and hard rock guy. Any tracks out there I should use for dialing in the EQ?

Some suggest to use a high pass filter at 45 Hz but I was planning to set it at 50 or even 55 Hz. I don't do electronic or hip hop music so I don't need super low frequencies. And I'd like to save the amp headroom for the frequencies I do use. Any thoughts on that HP filter frequency?

And I know it is preferred to test everything in a big, open, outdoor space but it is January in North Dakota. I am using a large aircraft hangar; that's about as large and open as I can get this time of the year without getting frostbite in the first hour.

Any and all info/suggestions are welcomed. Thanks!

[Bill Fitzmaurice]

Power handling is slightly better at 50Hz than 45Hz, so for maximum output 50Hz is slightly better. There's nothing to be gained by going higher than that. Testing outdoors is best if that's where you'll be using them, but otherwise indoors in a room typical of where you'll use them is better.

[Bryan Cox]

Power handling is slightly better at 50Hz than 45Hz, so for maximum output 50Hz is slightly better. There's nothing to be gained by going higher than that. Testing outdoors is best if that's where you'll be using them, but otherwise indoors in a room typical of where you'll use them is better.

Thank, Bill. I'll set the HP filter at 50 Hz then. The aircraft hangar is about the only place I have other than my garage and that certainly isn't large enough. I'll do the best I can with what I have. When I get the opportunity to do it all again outside, I will.

[Seth]

Some suggest to use a high pass filter at 45 Hz but I was planning to set it at 50 or even 55 Hz. I don't do electronic or hip hop music so I don't need super low frequencies. And I'd like to save the amp headroom for the frequencies I do use. Any thoughts on that HP filter frequency?

The E string on a 4 string bass has a fundamental frequency of 41.2 Hz. Given your gear, I'd personally High Pass at 40Hz for that reason. Those are frequencies you use if you have a bass player or keyboardist. The bottom note on a 5 string bass, is C, 31.87Hz. High passed at 40 on a 24dB slope, you'd still likely get some representation of that fundamental through T39's. Virtually none if passed at 50. Although, apparently not too many people notice what's not there. I'd say play it both ways and see what you and the guys think. Maybe even do it as a blind test. Just ask them if they hear anything different between the two settings. If no one hears it, put it at 50.

[Seth]

Power handling is slightly better at 50Hz than 45Hz, so for maximum output 50Hz is slightly better.

As in... increased allowable voltage limit? If so, what's the magic number?

[Tom Smit]

Seth, you are absolutely correct about the fundamental. However, the "character" of the bass starts an octave above that. That, and, most of what we hear from a bass amp often never gives a full presentation of the fundamental anyway. Bryan will be safe. SQ-wise, at an HP of 50hz.

[Seth]

Seth, you are absolutely correct about the fundamental. However, the "character" of the bass starts an octave above that. That, and, most of what we hear from a bass amp often never gives a full presentation of the fundamental anyway. Bryan will be safe. SQ-wise, at an HP of 50hz.

Yup. Different way to say the same thing. If you can't hear a difference, ya don't need it. I'd use it if I could though. Why cut it out?

[Tom Smit]

Seth, you are absolutely correct about the fundamental. However, the "character" of the bass starts an octave above that. That, and, most of what we hear from a bass amp often never gives a full presentation of the fundamental anyway. Bryan will be safe. SQ-wise, at an HP of 50hz.

Yup. Different way to say the same thing. If you can't hear a difference, ya don't need it. I'd use it if I could though. Why cut it out?

Why cut it out? My answer would be "headroom", "erring on the side of safety".
Having said that, I've set my limiter to max voltage, and the HP at 45hz and run my BP102-loaded T39s to the limit (because of the different music styles), LOL.

[Seth]

Seth, you are absolutely correct about the fundamental. However, the "character" of the bass starts an octave above that. That, and, most of what we hear from a bass amp often never gives a full presentation of the fundamental anyway. Bryan will be safe. SQ-wise, at an HP of 50hz.

Yup. Different way to say the same thing. If you can't hear a difference, ya don't need it. I'd use it if I could though. Why cut it out?

Why cut it out? My answer would be "headroom", "erring on the side of safety".
Having said that, I've set my limiter to max voltage, and the HP at 45hz and run my BP102-loaded T39s to the limit (because of the different music styles), LOL.

I 100% agree with those reasons if they are REAL reasons. I'm pretty sure Bill has already made his recommendations with those criteria in mind. I'd rather fix a known issue than avoid an imaginary one.

If I can make 35Hz at full rated power on my planned T48's, there's no way in hell I'm going to cut it higher than that unless a problem arises.

If you guys don't need below 50, maybe Bill should design a 50Hz Titan 27 . Same 12" driver options and sensitivity as the T39 and T48, but only above 50Hz.

[Bryan Cox]

Power handling is slightly better at 50Hz than 45Hz, so for maximum output 50Hz is slightly better.

As in... increased allowable voltage limit? If so, what's the magic number?

I'm just thinking in terms of LIMFACS. My Behringer NX3000D will have a hard enough time reaching 50 VAC @ 50 Hz sine wave in the first place. I don't want to waste voltage reproducing frequencies that low. Don't get me wrong; I'm not saying it's a waste. But given my current set up I don't have the headroom to focus on those frequencies. One day, if I upgrade my amps I'll ensure I can reproduce those frequencies without breaking a sweat. But I'll probably only do that after I double my cab count. 40 Hz pulls significant juice and I don't want to go blowing drivers or running my amps on the verge of supercriticality.

Call me a Nancy, but I like to err on the side of caution when I can.

[Seth]

I'm just thinking in terms of LIMFACS. My Behringer NX3000D will have a hard enough time reaching 50 VAC @ 50 Hz sine wave in the first place. I don't want to waste voltage reproducing frequencies that low. Don't get me wrong; I'm not saying it's a waste. But given my current set up I don't have the headroom to focus on those frequencies. One day, if I upgrade my amps I'll ensure I can reproduce those frequencies without breaking a sweat. But I'll probably only do that after I double my cab count. 40 Hz pulls significant juice and I don't want to go blowing drivers or running my amps on the verge of supercriticality.

Call me a Nancy, but I like to err on the side of caution when I can.

I really don't think that amp is going to be the lazy slouch some have made it out to be. (B R U C E (totally just a friendly tease I appreciate and value Bruce quite a bit ) )

I think you'll be blown away when you fire all 4 of those babies up together. Did you make a V plate?

I really don't think you'll be constantly bumping the limiter either. If you are, you need more cabs, not another fifty watts a box.

Also, measure your amps output voltage. It might actually be closer to 60.

[Seth]

Again, the output difference between 50 and 55 volts is minimal... 0.83dB. Whether you have 1, 2, 4, or 10 cabs... 0.83dB

If you're riding the limiter at 50, you'll be riding it at 55 too.