SLA drivers

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Timekeeper17
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SLA drivers

#1 Post by Timekeeper17 » Fri Jan 14, 2022 3:07 pm

Going to be building some sla
LR and curved center and surrounds soon. Looking at the recommended drivers and was wondering if there's any difference between the pioneer and goldwood driver other than about $8.00 a driver? I am also interested in using the Dayton driver that is about the same price as the pioneer driver. Any recommendations?

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Bill Fitzmaurice
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Re: SLA drivers

#2 Post by Bill Fitzmaurice » Fri Jan 14, 2022 4:25 pm

The specs matter, the price and brand doesn't. Don't be afraid to search around for other options as well. I built the originals with NSB (no stinking badges!) drivers of unknown origin that cost around a dollar each.

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Seth
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Re: SLA drivers

#3 Post by Seth » Fri Jan 14, 2022 6:03 pm

At $4.90 each, I've been considering these.
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: SLA drivers

#4 Post by Bill Fitzmaurice » Fri Jan 14, 2022 6:10 pm

Those look very good, and the price is right. I'd scoop those up if I was considering a build.

Bruce Weldy
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Re: SLA drivers

#5 Post by Bruce Weldy » Fri Jan 14, 2022 6:48 pm

Bill Fitzmaurice wrote:
Fri Jan 14, 2022 6:10 pm
Those look very good, and the price is right. I'd scoop those up if I was considering a build.
No problem with 'em being 16ohm? Plans are pretty specific to use 8ohm. I couldn't figure out how to get 4 16ohm drivers down to an 8ohm load....

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Seth
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Re: SLA drivers

#6 Post by Seth » Fri Jan 14, 2022 7:33 pm

That's a good point Bruce, for a 4 driver SLA. Works out fine for an 8 driver center or TLAH. Not sure I'd be too-too worried about a 4ohm main. It is a valid point and consideration.

The slight hitch I saw was that their edge to edge diameter is 4.75" and the plans specify not more than 4.5" edge to edge.
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

Rich4349
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Location: Kankakee, IL

Re: SLA drivers

#7 Post by Rich4349 » Fri Jan 14, 2022 8:26 pm

Or better yet: floor to ceiling!
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!

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Bill Fitzmaurice
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Re: SLA drivers

#8 Post by Bill Fitzmaurice » Fri Jan 14, 2022 10:55 pm

Bruce Weldy wrote:
Fri Jan 14, 2022 6:48 pm
I couldn't figure out how to get 4 16ohm drivers down to an 8ohm load....
You can't. It would require recalculating the crossover component values to run at either 4 or 16 ohms, but that's not at all difficult. With respect to the low pass to go from 8 to 4 ohms you halve the coil values and double the cap value. To go from 8 to 16 ohms double the coil values and halve the cap value.

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Seth
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Re: SLA drivers

#9 Post by Seth » Sat Jan 15, 2022 2:05 am

Bill, in looking at the Sketchup files, it looks as though those drivers 4¾" overall diameter could work okay for the SLA center with tweeters rear mounted, would probably work okay in a TLAH with 8 drivers, but the height of the SLA's wouldn't accommodate them without modifying the cab dimensions or trimming an eighth off the edges of the driver. Neither of those options seems like a deal breaker, I wouldn't think.
299-320_ALT_1.jpg

Would you recommend either of those options in particular over the other, or just suggest looking for a different driver of the correct dimensions?
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

jimbo7
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Re: SLA drivers

#10 Post by jimbo7 » Sat Jan 15, 2022 10:28 am

I built my SLA's with 5" drivers similar in style and price to Seth's link. I didn't need to modify the crossovers, but I did have to redesign the cabs (which was against the plans). It was a total pain in the butt and I'll never do it again. At the time I was working with an extremely tight budget. My advice it to use the recommend parts or find some with the same specs as to not alter the plans any.
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

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Bill Fitzmaurice
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Re: SLA drivers

#11 Post by Bill Fitzmaurice » Sat Jan 15, 2022 12:16 pm

Making the box large enough to accommodate 4 3/4" diameter drivers is no biggy, since it's a sealed cab and you don't have to be concerned with upsetting the tuning. OTOH looking at the backside of those drivers I can see that it wouldn't be difficult to trim them with an abrasive blade, just being careful to wrap the motor well to keep metal sawdust off the magnet. I'd even use tin snips if using a grille.

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Seth
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Re: SLA drivers

#12 Post by Seth » Sat Jan 15, 2022 1:34 pm

Bill Fitzmaurice wrote:
Sat Jan 15, 2022 12:16 pm
Making the box large enough to accommodate 4 3/4" diameter drivers is no biggy, since it's a sealed cab and you don't have to be concerned with upsetting the tuning. OTOH looking at the backside of those drivers I can see that it wouldn't be difficult to trim them with an abrasive blade, just being careful to wrap the motor well to keep metal sawdust off the magnet. I'd even use tin snips if using a grille.
Thanks for the feedback and great advice about wrapping the motor. I'd have definitely learned that the hard way. :thumbsup:

Well, I'm adding 2 TLAH's, an 8 driver SLA center, and two SLA surrounds to my list of future builds. I went ahead, pulled the trigger, and ordered 36 of those drivers. 8 more drivers than the 28 I need for the project put me at the next qty price break and only cost an extra $20 ($2.50 per spare driver). I'm thinking I'd rather have them and not need them, than need them and not be able to find a matching replacement sometime down the road. Or maybe I'll make a pair of 4 driver SLA's with them. We'll see.

Sanity check. After these arrive, my parts shelf will have four Delta 12LFA's, four 3012LF's, four S2012's, eight PRV Neo 8's, two PRV Neo 6's, an Alpha 6A, a BP102, an MCM 8, a box of about 80 piezo's... and 36 4" drivers. I've really gotta stop buying and start building :bash:
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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Tom Smit
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Re: SLA drivers

#13 Post by Tom Smit » Sat Jan 15, 2022 9:49 pm

Seth wrote:
Sat Jan 15, 2022 1:34 pm
I've really gotta stop buying and start building :bash:
Yup. :lol:
TomS

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