Full range driver for SLA

For livingroom sound better than in a theatre.
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Bob G
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Full range driver for SLA

#1 Post by Bob G » Sat Apr 01, 2017 3:36 am

Does anyone have an opinion on a full range driver for the SLA? The specs on these look pretty decent. Anything interesting besides these out there?

http://www.parts-express.com/dayton-aud ... r--295-352

http://www.parts-express.com/faitalpro- ... --294-1121

https://www.madisoundspeakerstore.com/a ... nge-8-ohm/

Grant Bunter
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Location: Ilfracombe Queensland Australia
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Re: Full range driver for SLA

#2 Post by Grant Bunter » Sat Apr 01, 2017 4:35 am

Wow! :broke:

Errr pass on them. All of them.
The peerless has response to 10K.
They are all way to expensive, antithesis to great sound built DIY at low cost.

Get the recommended drivers from Leland at Speakerhardware.com
The recommended Goldwood Mid basses are $9.38 each.
And the Goldwood 302 Tweets are $2.46 each.

Leland runs a great family business, helps out all of us around the world, and deserves the business...
Built:
DR 250: x 2 (melded array) with March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...


jimbo7
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Location: St. Louis

Re: Full range driver for SLA

#4 Post by jimbo7 » Sat Apr 01, 2017 11:49 am

What!? Where was this when I built mine!? Well I guess I know what I'm doing when I start my home theater build.
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
OT12 flat array

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Bill Fitzmaurice
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Re: Full range driver for SLA

#5 Post by Bill Fitzmaurice » Sat Apr 01, 2017 12:28 pm

jimbo7 wrote: What!? Where was this when I built mine!?
http://billfitzmaurice.info/forum/viewt ... =5&t=24006

Keryn O'Shea
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Location: Brisbane, Australia

Re: Full range driver for SLA

#6 Post by Keryn O'Shea » Mon Dec 11, 2017 5:42 am

Grant Bunter wrote:Leland runs a great family business, helps out all of us around the world, and deserves the business...
Champion!
I'll fit this next panel, then off to bed...

Think
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Re: Full range driver for SLA

#7 Post by Think » Tue Dec 12, 2017 12:09 pm

I have experience with drivers a like http://www.visaton.com/en/industrie/bre ... s8m_8.html (€10/$11@Thomann.de) and these are great, but their problem is that the high frequencies are very directional and not very defined. Speech sounds great but there is not much 'air'.
Visaton provides dispersion graphs (so should Eminence) and this driver has a very nice dispersion up to 4k and then start narrowing pretty quickly :
Image
I'm got them to hear if I could use them without tweeters, but going to combine them with some tweeters: https://www.parts-express.com/dayton-au ... m--275-083 2 mids in a 120 degrees angle (60 degrees output offset) in the horizontal plane with 1 tweeter in between them will give full 90+ degrees coverage. I got some 5k crossovers from ebay; 2 for $12.
If they sound well together, I can stack many units like this to make very powerfull vertical array with great horizontal coverage. 8 Of these little drivers and 4 tweeters will have about 97dB/W sensitivity and may be fed 240w rms. All from a 8" x 8" x 16" (!) speakerbox: great (with subs) for small podia in pubs, restaurants etc.
I'm really looking forward to hear this combination; probably early next year.

Grant Bunter
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Re: Full range driver for SLA

#8 Post by Grant Bunter » Tue Dec 12, 2017 3:54 pm

Think wrote: I'm got them to hear if I could use them without tweeters, but going to combine them with some tweeters: https://www.parts-express.com/dayton-au ... m--275-083 2 mids in a 120 degrees angle (60 degrees output offset) in the horizontal plane with 1 tweeter in between them will give full 90+ degrees coverage. I got some 5k crossovers from ebay; 2 for $12.
If they sound well together, I can stack many units like this to make very powerfull vertical array with great horizontal coverage. 8 Of these little drivers and 4 tweeters will have about 97dB/W sensitivity and may be fed 240w rms. All from a 8" x 8" x 16" (!) speakerbox: great (with subs) for small podia in pubs, restaurants etc.
I'm really looking forward to hear this combination; probably early next year.
This idea of yours is totally off reservation, and as such should be in a separate post in the "everything else" section. It has nothing to do with the topic, or SLA's.

Apart from that, the SLA pro has higher sensitivity. 2 mid drivers side by side horizontally will suffer from comb filtering (comb filtering isn't as obvious when drivers are stacked vertically, we don't tend to pogo up and down listening to music).
The curved concave face of the SLA centre is designed to alter the dispersion pattern for the above reason.

It's a fundamental of sound that as frequency increases, so does directivity...
Built:
DR 250: x 2 (melded array) with March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

Think
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Joined: Tue May 09, 2017 5:37 pm
Location: The Neterlands / Holland
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Re: Full range driver for SLA

#9 Post by Think » Tue Dec 12, 2017 4:12 pm

No, I'm not going to discus that build; just letting know where I use a similar driver for and that it's lacking high end ability even though the specs look great.
The tweeter mentioned is probably very usefull (and cheap) in SLA builds with tweeters.
The combfiltering is no issue as the drivers are very close to each other and the 'woofers' are pointing inwards, creating a virtual sourcepoint, or vertical line when used in multiples, in front of the speaker. Bill does the same with the SLA center speaker, melded arrays and some other designs.

Rich4349
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Location: Kankakee, IL

32 ohm version

#10 Post by Rich4349 » Wed Dec 13, 2017 11:36 am

What drawbacks would there be to using the 32 ohm version of the Eminence Alpha 3, all paralleled, with no series division? Wouldn't this increase efficiency by 18 dBs, with no drawbacks?


https://www.midwestspeakerrepair.com/em ... nge-driver
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: Full range driver for SLA

#11 Post by Bill Fitzmaurice » Wed Dec 13, 2017 12:00 pm

It would have no effect on sensitivity. The voltage sensitivity of a 32 ohm driver will be 6dB lower than an 8 ohm driver. I'd be leery of it, because the specs of the 32 ohm version won't be the same as the 8 ohm version. You can't use a different voice coil to change impedance without other specs being affected.

Rich4349
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Re: Full range driver for SLA

#12 Post by Rich4349 » Wed Dec 13, 2017 12:45 pm

So the absence of dividing due to serial arrangements is cancelled out by the extra dividing of the higher impedance's lower efficiency? Are you saying there's no free lunch?
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: Full range driver for SLA

#13 Post by Bill Fitzmaurice » Wed Dec 13, 2017 1:36 pm

Rich4349 wrote: Are you saying there's no free lunch?
Only at a soup kitchen. :wink:

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