SLA Pro

[bzb]

Tweeters don't hiss. Amps hiss.

Doh. Is that mainly an issue with the XTi series? Strangely enough, I get a light hiss when I hook up the OT12s, but it's not nearly as prevalent as the SLA. I would have guessed the OT12s would make that sound louder.

I can forsee the hiss, being as loud as it is, being an issue at really quiet ceremonies.

[bzb]

All I can say is....




you forgot to paint the big black round things

Crap, you're right. Don't worry, I'll paint them after I caulk them.

[Radian]

What else did you have upstream of the amp? anything?


Cabs looks frigg'n hot BTY. Nice work!

[bzb]

What else did you have upstream of the amp? anything?


Cabs looks frigg'n hot BTY. Nice work!

Thanks, I wasn't 100% sure I made the right decision until that 5th coat of Duratex Then I thought, Bill hasn't steered me wrong. And I want that extra work from the planners/coordinators, so these damn things are going to be white!

I don't have any faders up on the board. I could try out the 01V tomorrow see if it makes a difference. Typically I have the board feeding into ART 341 EQ, but it's in the other rack right now.

Yamaha 124 -> Crown XTi 2000 with xover set @100Hz 24db Butterworth -> banana to speakon

[Bill Fitzmaurice]

Tweeter sensitivity can be reduced by placing the 4 ohm resistor before the capacitor rather than after. But I doubt the hiss would be noticeable other than in a small quiet room.

[Chris_Allen]

Doh. Is that mainly an issue with the XTi series?

My XTi4000's (both of them) make my DR200's and O10.5 hiss, but the Behringer, Yamaha and Peavey amps don't.

[Bill Fitzmaurice]

Doh. Is that mainly an issue with the XTi series?

My XTi4000's (both of them) make my DR200's and O10.5 hiss, but the Behringer, Yamaha and Peavey amps don't.

Chances are the DSP is the source of the noise. But possibly no worse than the noise that results from an external DSP. Still it would be prudent to make sure the DSP gain structure is properly configured.

[bzb]

That's exactly culprit. I set it to DSP Off and the "airy" sound changed the more familiar white noise hiss, but much lower. Only setting I had on that profile was the crossover and limiter. I guess I'll be playing with System Architect to see if I can get that removed.

Thanks for the ideas. The cabs sound fantastic, Bill. I'm tempted to build two more black ones.

[Gregory East]

What about black road cases with tophats for these princesses so they stay white

[johns811]

Couple questions. Did you have to cut individual tweeters to get them to look like that. They look like 1 unit. Was it difficult to do that. How do the middle tweets stay in the box with just the screws on top and bottom.

To paint the tweeters, does anything need masked to not ruin them.

Lastly is there a less expensive woofer choice like Dayton, or Goldwood that would perform decent.

Any info appreciated.

[Frederic Gelinas]

Couple questions. Did you have to cut individual tweeters to get them to look like that. They look like 1 unit. Was it difficult to do that.

It's in the plan. The plan shows how to cut and glue the tweeters. To paint them, use a can of plastic paint.

[David Carter]

Very nice!

What would be your estimate of total build cost per cab?

[bzb]

Couple questions. Did you have to cut individual tweeters to get them to look like that. They look like 1 unit. Was it difficult to do that. How do the middle tweets stay in the box with just the screws on top and bottom.

To paint the tweeters, does anything need masked to not ruin them.

Lastly is there a less expensive woofer choice like Dayton, or Goldwood that would perform decent.

Any info appreciated.

As above, it's in the plans. It's not difficult, they're just plastic. The ABS cement that Leland has in black works perfectly. They're attached by caulk and clamps.

If you go back a few posts, there's a picture of the clamps on the piezos. I actually was able to get those blue Irwin clamps almost centered on them, and that provided enough pressure to get a good seal when the caulk dried.

I disassembled the piezos before cutting, assembling, and spray painting them with a semi gloss white.

The drivers are pro drivers, since these are pro cabs.

Very nice!

What would be your estimate of total build cost per cab?

Even better for ya, I kept an Excel chart this time.

Code: Select all

Plywood	1	30.74	30.74
Alpha 6	8	35.99	287.92
Piezo 1016	12	2	24
Shipping	1	20.54	20.54
Top Hats	2	5.95	11.9
Xover Filter	2	7.99	15.98
Damping	1	5	5
Speakon	2	3.75	7.5
Duratex	1	70	70
Grills	2	24	48
Grill mounts	1	7.5	7.5

			529.08

$265 each not including the fasteners and way less than a tube of PL. I also didn't include the speaker foam, but I don't think it costs much. I have a friend who does pro installs on boats that's going to give me some cutoffs.

[Bill Fitzmaurice]

$265 each.

I had to make a best guess as to the retail value of these, because there's absolutely no commercial equivalent. I settled on $599 based on what is out there, and they're primarily one-way systems loaded with three or four inch drivers that don't come close to what the SLA Pro offers.

If you go back a few posts, there's a picture of the clamps on the piezos. I actually was able to get those blue Irwin clamps almost centered on them, and that provided enough pressure to get a good seal when the caulk dried.

I'd drill holes through the array frame for a few more screws.

[bzb]

$265 each.

I had to make a best guess as to the retail value of these, because there's absolutely no commercial equivalent. I settled on $599 based on what is out there, and they're primarily one-way systems loaded with three or four inch drivers that don't come close to what the SLA Pro offers.

If you go back a few posts, there's a picture of the clamps on the piezos. I actually was able to get those blue Irwin clamps almost centered on them, and that provided enough pressure to get a good seal when the caulk dried.

I'd drill holes through the array frame for a few more screws.

I'm going to compare them to the EV ZX1-90s as best I can on video. They absolutely kill them in terms on sensitivity (of course) and the single SLA is easily is louder than the two ZX1s. Considering the ZX1-90s are $299 at the cheapest, the SLA Pro is an incredible value.

What do you think of something comparable to the size of the ZX1s, along the lines of 4-5 piezos and 2 of the Alpha6C?

I was kind of surprised to find that the caulk is holding pretty well, but I'll add some more screws. Any ideas on re-caulking the outside portion (between the piezo frames and the ply)? My finger won't fit in there to smooth the caulk.