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Full Range Recommendation for OB, High Efficiency
Full Range Recommendation for OB, High Efficiency
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Old 14th May 2018, 04:41 PM   #1
wicked1 is offline wicked1  United States
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Default Full Range Recommendation for OB, High Efficiency

Hi, I hate to ask this, because I'm sure others have before me.. But I don't have a ton of time for research right now.. (Just bought a new house that I'm rehabbing, and I need speakers for it).

I have a pair of Emminence 15" woofers. I want to build an OB speaker system for them. I will be bi-amping w/ active xover. My amps are both only about 5 watts.
The active xover gives me a lot of flexibility.

I was going to go for alpair 7 or 10's, but just looked at their efficiency, and they aren't great there. And, then I started going down the rabbit hole of looking at everything available and second guessing every thought I have... Then I notice over 2 hours have passed and I should be ripping out old kitchen cabinets.

So, maybe I'll see if anyone here is kind enough to answer my question so I don't need to spend hours researching .

I've always used fotex full range drivers in the past.. (I've built a few horn speakrs and one FAST style pair). So, I do like fostex, but would try anything. I would like to spend under $200 per driver.

That might be all the info you need.

Thanks for any advice.
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Old 14th May 2018, 05:08 PM   #2
chrisb is offline chrisb
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Have you heard an OB system in a room similar to where these would be operating?
Presumably you've read one of the better series of treatises on the subject - OB Theory

While a good active XO can certainly provide all the flexibility of turnover points, slopes and perhaps even EQ, I wonder if the 5WPC would be more of a limiting factor on the woofers than whatever FR drivers you elect for the top end.


That said, if you've been happy with sound of Fostex in the past, there's no reason to avoid them for this project, but of other affordable full rangers to consider would be Alpair (A7.3, A10P) Dayton (PS180 / 220), TangBand - and numerous others to be listed shortly, no doubt.
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Old 14th May 2018, 05:20 PM   #3
wicked1 is offline wicked1  United States
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Oh, you made me double check something.. which is that the woofers are rated at over 95db/w, but, looking at the graphs, that's not at the frequencies I'm using them for. They're much lower in the 20-100hz range. So, w/ that in mind, maybe the alpair's are a better match than I initially thought.

And yeah, all of my existing low power systems have active subs... I just got this miniDSP, and was hoping to play with bi-amping, but all of my amps are low powered. I guess one of them I'm planning to use is really more like 7-10 watts per channel.. the other is definitely around 5.
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Old 14th May 2018, 05:38 PM   #4
chrisb is offline chrisb
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I'm thinking Hoffman's Iron Law might have a special corollary when the bass driver has no enclosure at all?

To make sense out of the published sensitivity specs, it's helpful to know what the measurement conditions were. If assuming "standard" IEC baffles in anechoic chamber, for a 15" woofer that is 2530x3000mm. You can of course go much smaller than that, but with the requirement for substantially more power - assuming the voice coil can handle it.
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Old 14th May 2018, 05:56 PM   #5
planet10 is online now planet10  Canada
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Full Range Recommendation for OB, High Efficiency
what eminence woofer?

dave
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Old 14th May 2018, 06:01 PM   #6
wicked1 is offline wicked1  United States
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The alpha 15a's.
I've also got a pair of these 12" MCM's sitting in storage..
http://www.farnell.com/datasheets/23...690.1526315211

(And thanks guys, for your replies!)
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Old 14th May 2018, 06:22 PM   #7
Cal Weldon is offline Cal Weldon  Canada
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Full Range Recommendation for OB, High Efficiency
Your link takes me to the main page.

The Alphas are well suited to the OB game, and you're right, the sensitivity of them is lower when using them OB so the Alpairs are a good match.
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Old 14th May 2018, 06:29 PM   #8
wicked1 is offline wicked1  United States
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Maybe this one w/out the crud after the URL?
http://www.farnell.com/datasheets/2329552.pdf

If not, they're the mcm 55-2982 part number..
(I don't expect anyone to actually go and google things for me, but thanks for the help!)
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Old 14th May 2018, 06:57 PM   #9
chrisb is offline chrisb
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from my brief exposure to MCM metal cone drivers a few year ago, I'd take anything by Fostex or Mark Audio with suitable sensitivity for your task
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Old 14th May 2018, 07:07 PM   #10
CharlieLaub is offline CharlieLaub  United States
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FWIW, I'm linking (below) to a recent post I made on this site regarding OB/dipole design, since you are in the design stages now.

Basically I assert that mounting a full ranger centrally on a big planar OB is bad (or at least has some big flaws), and suggest a way to design an OB that should sound "better". My 2 cents for you, and others who will listen.

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