A pair of SLAs... Perhaps..

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JensToft91
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Re: A pair of SLAs... Perhaps..

#16 Post by JensToft91 »

Bill Fitzmaurice wrote: Sat Jul 23, 2022 3:05 pm Their data is flawed, because modeling programs are only accurate up to about 200Hz. They also show results if mounted in a wall baffle, not enclosures of equal size. Worse, they measure one at 2.83v, one at 4.0 v. I don't know what that's all about, but it accounts for a 3dB difference.
Thanks again Bill.
I'll probably start the saw tomorrow. :chainsaw:

JensToft91
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Re: A pair of SLAs... Perhaps..

#17 Post by JensToft91 »

Ah damn. I thought the "1/2 inch voice coil" was the dome size. My tweeter is 1 inch. So pretty far from the plans, I hope it doesn't screw things up.

How would you mount the 4PF-8? I'm thinking about front-mouting then because it's easier - and want to make some grills for them anyway.

Does it make a difference?

JensToft91
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Re: A pair of SLAs... Perhaps..

#18 Post by JensToft91 »

SLA is a bit simpler to build than the tubas.

Boxes dryfitted
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JensToft91
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Re: A pair of SLAs... Perhaps..

#19 Post by JensToft91 »

Drivers has arrived
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Seth
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Re: A pair of SLAs... Perhaps..

#20 Post by Seth »

Dang Jens, you're moving right along on this venture :thumbsup:

I'm not sure the dome size will or won't negatively effect the sonic quality of your build. But, I would think if the frame size is still 2½" or less, you should be fine. We'll see what Bill has to say about the suitability of 1" tweeters instead of the recommended 3/8 to 1/2 inch variant. I'm curious too.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Bill Fitzmaurice
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Re: A pair of SLAs... Perhaps..

#21 Post by Bill Fitzmaurice »

1" tweeters won't have as wide dispersion as smaller units. The reason to use 1" is when they're crossed over fairly low, which you do with larger midbasses because they have narrower dispersion in their upper end than smaller midbasses. Other than with subs the reason to use a particular size driver is output capability versus dispersion, which is always a compromise.

JensToft91
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Re: A pair of SLAs... Perhaps..

#22 Post by JensToft91 »

Makes sense. Hope it'll work out!

JensToft91
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Re: A pair of SLAs... Perhaps..

#23 Post by JensToft91 »

Read the instructions. Twice. And then one more time.
Then check the drivers you're buying. Then check them again.
I'll probably be better at cutting them as I go along. First one is not pretty. I'll smooth it out with some acrylic filler. Wood filler, perhaps?
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JensToft91
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Re: A pair of SLAs... Perhaps..

#24 Post by JensToft91 »

Not so pretty. But it'll work. Next challenge is to seal it properly.
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Re: A pair of SLAs... Perhaps..

#25 Post by JensToft91 »

:hyper:
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Seth
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Re: A pair of SLAs... Perhaps..

#26 Post by Seth »

Good job Jens. I'm not sure my mind would have come up with that solution on its own. Very creative :thumbsup:

Is it your intention to use them for the outdoor deal? Or are you still planning on using the boominator for that?
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

JensToft91
Posts: 140
Joined: Sun Feb 28, 2021 6:43 am

Re: A pair of SLAs... Perhaps..

#27 Post by JensToft91 »

Seth wrote: Fri Jul 29, 2022 10:44 am Good job Jens. I'm not sure my mind would have come up with that solution on its own. Very creative :thumbsup:

Is it your intention to use them for the outdoor deal? Or are you still planning on using the boominator for that?
Thank you.
I'm thinking the boominator, but it could be fun with these.

I really underestimated all the wiring and hole cutting. A moment of silence for those of you, who has build til TLAH and SLA centers.

And then all the modifications I have to do. Failing to plan is planning to fail, right?

Rich4349
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Re: A pair of SLAs... Perhaps..

#28 Post by Rich4349 »

I thought the idea was to cut all of the interior, adjoining edges flat?
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!

JensToft91
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Re: A pair of SLAs... Perhaps..

#29 Post by JensToft91 »

Sorry guys. I won't be finishing the project anyway. Thanks for all your answers.

I'll say goodbye (again!) - and hopefully this time, I'll be able to stay off the internet and speaker addiction for good.
I actually just took a drill trough all "DIY" components I have lying around. Not the ones I'm actually using ofcourse.. It's really not healthy for me - time to focus on the family :-)

Bye!

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Tom Smit
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Re: A pair of SLAs... Perhaps..

#30 Post by Tom Smit »

Oh man! I hope that everything is alright.
TomS

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