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Old 16th March 2017, 11:57 PM   #1
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Default Thinking about a high efficiency 15" 3-way

Might be time to make more sawdust... Well, if it ever decides to get above 18 deg F !

I am thinking about a 15" 3-way for domestic use. I like < 50w class A room heaters like the Aleph and KSA50 circuits.

Thinking of a 15" vented woofer cabinet > 8" midbass (sealed or OB) > Econowave-ish horn

Looking into woofers. Love to go with something James Bee Lansing-esque but too much $$. I'm looking at the Eminence Kappa 15 LFA. This is the stamped steel cheapy, but I like how it models better than the 'pro' version, and i personally am not bothered by the basket material. 4 to 5 cu-ft is probably my limit size wise.

Let me know what you think. At first the 99dB rating scared me, but it looks like that's the average including that nastiness that will get filtered out. More like 96-97dB. These are all the alignments (QB3, BB4, etc) from winisd pro with just the software spitting it out - no manual intervention. I am NOT looking for 'subwoofer' performance. Just 'cracking' music!

I think it looks like a contender - you?

Eminence Kappa-15LFA 15" Low Frequency Driver 8 Ohm
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File Type: png LFA freq.PNG (65.3 KB, 537 views)
File Type: png LFA specs.PNG (32.7 KB, 528 views)
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Last edited by mpmarino; 17th March 2017 at 12:04 AM.
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Old 17th March 2017, 12:38 AM   #2
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Worth a visit...CNC cut flat packs

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Old 17th March 2017, 12:54 AM   #3
adason is offline adason  United States
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Check out FaitalPro woofers, high efficiency, great performance.
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Old 17th March 2017, 01:07 AM   #4
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Quote:
Originally Posted by LineSource View Post
Worth a visit...[/url]
Thanks - I don't think I'd buy anything 'pre-made', but interesting.

edit: very on topic though!

Quote:
Originally Posted by adason View Post
Check out FaitalPro woofers, high efficiency, great performance.
Actually, I'm liking a Faital midbass for this. Also there are Faital 8" and 4" in my toy car

I'm just not seeing any Faitals out of JBL $$ range that can get me where i want to be.

Even if you are not an eminence fan (I am), do you see any issue with how the Kappa LFA models for domestic non-sub use?
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Last edited by mpmarino; 17th March 2017 at 01:11 AM.
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Old 17th March 2017, 01:47 AM   #5
adason is offline adason  United States
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Suit yourself...99db, Fs 38 Hz, 700 watts, 8 ohm...hard to beat
FaitalPRO | LF Loudspeakers | 15FX560
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Old 17th March 2017, 01:49 AM   #6
adason is offline adason  United States
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Or this one
FaitalPRO | LF Loudspeakers | 15PR400
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Old 17th March 2017, 02:24 AM   #7
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Quote:
Originally Posted by adason View Post
Suit yourself...[/url]
That is the point!

But, you might be right here. They certainly look cleaner on top. I haven't looked at how they will tune yet, but they look pretty good at first glance parameter wise.

Geez, they're so damn sensitive!

The 15PR400 isn't really out of reach.

Thanks for the tip
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Old 17th March 2017, 02:47 AM   #8
wg_ski is online now wg_ski  United States
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They are more sensitive, but they don't quite go as low. There actually seem to be more choices for a higher performer, with the same frequency response, in the same size box as the 15LFA - if you go to an 18.

The only thing "wrong" with the 15LFA is the 10mm x-mech. Would be nice to have a bit more headroom before hitting the stops. If you're using under a 200 watt amp that probably won't be an issue.
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Old 17th March 2017, 04:19 AM   #9
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Preaching to the Choir

1) You can spend more money on better drivers by selecting a proven combination of drivers and proven(measured) crossovers. Crossovers cost ~$150-$250/speaker

2) Successful size and efficiency combinations:
**18" woofer + 12" midrange + 1" compression driver + 15" or wider horn ~ 1300Hz crossover
**15" woofer + 10" midrange + 1" compression driver + 12" or wider horn ~ 1500Hz crossover

3) Start at 20kHz: Study and leverage the extensive Econowave engineering by using a proven:
- horn + compression driver + 10" midbass + crossover.
OR
- horn + compression driver + 12" midbass + crossover.

4) Cabinet designs with baffle diffraction control are still important with horn speakers

5) Room placement and room effects should be modeled from the start
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Old 17th March 2017, 07:06 AM   #10
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use 15R400 or 15FX520 from Faital Pro
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