Titan 39 Build

[jimbo7]

BTW, on the first cab the grill and driver cover mounting scheme and the mouth braces are a bit different. Didn't quite know how I wanted to do things when I started.

Oh no! Now you gotta build 2 more just like that one!

[Bryan Cox]

BTW, on the first cab the grill and driver cover mounting scheme and the mouth braces are a bit different. Didn't quite know how I wanted to do things when I started.

Oh no! Now you gotta build 2 more just like that one!

It's funny you say that because I told my wife the same thing. I am building more in the future. But I'll just have to have a black sheep.

[Seth]

Is it Saturday yet?

[Bryan Cox]

Is it Saturday yet?

Man, I wish. Been biting my nails all day. I have to write some annual reports on my troops in the morning but I hope to be at my jam room by noon-ish. Then I'll probably be there until late at night.

[Bryan Cox]

To say that I'm floored is an understatement. I knew I'd be happy with my system but I didn't know the frangible roof of the hangar would sympathetically rattle at only 25 VAC.

I set up and ran the 50 Hz sine through the board to set the amp limiter. Come to find out I don't need to set one at all. The NX3000D only put out 29.9 VAC max. I had the faders all slammed into the red and when I clipped the amp input I got closer to 35 VAC. But with the faders at unity gain and the amps dined I was steady at 29.9 VAC. Seth, you were right. And I knew that but I thought I'd at least get closer to 40 VAC.

I set up the HP @ 50 Hz and LP at 100 Hz.

At this point I don't much care though. At almost 30 volts I was getting very impressive SPL.

- 50 Hz sine @ 29.9 VAC/1 meter = 113.4 db
- Music track with faders at unity gain and amp dimed yielded 100 - 110 db continuously and 124 db peak/1 meter

Here are a few data points I collected along the way:
- 40 1/2" tall (w/feet) x 20" wide x 19 1/2" deep
- loaded w/3012LF
- Arauco 1/2" ply
- 62.8 lbs
- $386 ea
- $1544 (total for 4)

My JBL PRX 818 cost almost $1k each and they don't do what these do. They don't even come close. Oh and they weight 98 lbs each.

Let me know if there's anything I missed.

Bill, you're a freaking speaker design wizard. Thanks a ton for providing kick ass designs for us. I have much more planned for the future and I can only imagine what kind of SPL I'll get when I double the cab count and get amps that'll provide the necessary power.

[Bryan Cox]

Oh I almost forgot. All 8 speakers fit into the bed of my truck. That's a plus for me.

[Tom Smit]

[Seth]

Seth, you were right. And I knew that but I thought I'd at least get closer to 40 VAC.

Sound's more like Bruce was right. I expected between 50-60. 30-35 is a little underwhelming. Are you sure you don't have the NX1000D? Joke, but still, that's numbers I'd expect from a Behringer 1000. When I get outta this damn skilled nursing facility I'll double check the NU4-6000 again and see what it's at for sure. Were your speakers disconnected while reading output voltage?

I'm glad to hear your impressed anyway. I've been bird dogging the site all day waiting for your report.

Does your SPL meter read dBA or dBC?

[Bryan Cox]

Yeah it's the NX3000D for sure. I had the speakers disconnected when I tested the voltage. The amp doesn't have bare wire connection points so I had to figure out where the + was inside the speaking output and I grounded to the fan cover. Like I said, I had the mixer and amp gains slammed and I only got 35 VAC max. But that was with everything in the red. That was my first time testing an amp output so I could've very well don't something wrong.

As far as the meter us concerned, I have no idea if it was dBA or dBC. I can probably find out though.

And hell yeah I was impressed. I can't imagine how much louder the T39 is at 55 volts. I'll find out one day

[Bill Fitzmaurice]

Make sure your amp has the - outputs grounded to the chassis. Many amps today don't, so you might have a bad reading because of that.

[Bryan Cox]

Make sure your amp has the - outputs grounded to the chassis. Many amps today don't, so you might have a bad reading because of that.

I'll do that. Thanks

[Bryan Cox]

One nice thing about the Behringer NX series is they actually have a pretty easy way to limit voltage in the DSP package. And it has the option to switch between 12, 24, and 48 dB slopes.

I'm not totally disappointed in the amp because I'm happy with the overall result. I'll check the ground and hopefully there is nothing amiss.

[Seth]

...had to figure out where the + was inside the speaking...

I've gotta put my money on what Bill said being true about the speaker ground not being the same as chassis ground.

If your SpeakOn's are 2 pole, it won't matter which is + or -. Just get a test lead on one of each contact pad in the connector end. If it's 4 pole and I didn't know what's what, I'd keep one probe on one pad and probe the other three pads for voltage. If none, move over one and repeat until you find voltage. If voltage is twice what I'd expect, Ill know those pads are the "Bridged" terminals. One of the bummers about genuine Neutrik SpeakOn connectors is they're designed to stay closed and not open up once they're assembled. You can still get into them with a pair of pliers, but the retaining ring gets damaged when forcing them open.

I really would hope to see between 50-60v on that amp.

[Seth]

One nice thing about the Behringer NX series is they actually have a pretty easy way to limit voltage in the DSP package. And it has the option to switch between 12, 24, and 48 dB slopes.

I'm not totally disappointed in the amp because I'm happy with the overall result. I'll check the ground and hopefully there is nothing amiss.

The slopes are for the crossover and high pass "sub sonic filter". A limiter will have parameters such as threshold, attack (might not if it's zero attack only), hold, and release... similar to compressor settings.

[Bryan Cox]

One nice thing about the Behringer NX series is they actually have a pretty easy way to limit voltage in the DSP package. And it has the option to switch between 12, 24, and 48 dB slopes.

I'm not totally disappointed in the amp because I'm happy with the overall result. I'll check the ground and hopefully there is nothing amiss.

The slopes are for the crossover and high pass "sub sonic filter". A limiter will have parameters such as threshold, attack (might not if it's zero attack only), hold, and release... similar to compressor settings.

Yeah I noticed it's pretty much a compressor. If I get time tomorrow I'll fire it up again.