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Multi-Way Conventional loudspeakers with crossovers

Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
Is it possible to cover the whole spectrum, high spl, low distortion with a 2-way?
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Old 17th July 2019, 05:31 PM   #1371
docali is offline docali  Germany
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Quote:
Originally Posted by 4real View Post
How fair is it to compare these horns with vastly differing coverage? Obviously the Selenium has the least relative beaming, it's only a 40x20 horn compared to the 60x40 of the XT1464. Depending on the environment, it could still turn out that the wider horn suit one better.
Tell me what is really fair in our world

Interestingly, the 40x20 is a very conservative notation in my opinion. But it is absolutely sufficient for a home speaker and much better than any round horn.

What I mean is in what horn the driver feels more comfotable. Compare the two impedance measurements:

The XT1464 does not load the driver perfectly:
ND4015Be_with_adapter@XT1464.jpg

While the Selenium does:
ND4015Be_HL4750SLF_imp.jpg
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Old 17th July 2019, 05:45 PM   #1372
docali is offline docali  Germany
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Quote:
Originally Posted by peterbrorsson View Post
I have a Selenium 4750 90x40 2 inch horn so it suits me. However the build quality of the horn is atrocious. Looks like a child joined the horn with the throat. Package was marked "Proudly made by Harmon/JBL"

For the moment I'm an outcast, I have put Visaton FRS 5X in them)
You are absolutely right! The adapter is misaligned and not really planar but the horn itself is quite properly damped.

But also the XT1464 and the LTH142 are plactic bombs and have an unacceptable build quality.
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Old 17th July 2019, 05:45 PM   #1373
docali is offline docali  Germany
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Originally Posted by Ro808 View Post
China...
what is the source of this horn?
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Old 17th July 2019, 06:29 PM   #1374
Ro808 is offline Ro808  Netherlands
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It's from one of the many Chinese suppliers of plastic loudspeaker parts.

Decent quality, but nothing special as far as the horn profile is concerned.
Attached Images
File Type: jpg DCX50 in 2-Way + Nexo 15 Woofer_pub_II.jpg (81.8 KB, 398 views)

Last edited by Ro808; 17th July 2019 at 06:40 PM.
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Old 18th July 2019, 10:38 AM   #1375
Ro808 is offline Ro808  Netherlands
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Quote:
Originally Posted by 4real View Post
I'm still intrigued by the Reflector design. Would be cool to make a low budget version of it. Of course you could buy all the same components for much less than the asking price, but I'm thinking of something even more budget friendly: XT1464 with HF146 as a basis. Now finding half decent budget 15" or 18" woofers is tricky. The best bang for buck I could find was Oberton 18B450. They are €165,- a pop. You'd then need just under € 1000,- for only the drivers of one side.
If you'd clone the P1805, it would save you 4 woofers. This seems also easier to build and looks less intrusive as well.
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Old 19th July 2019, 01:12 PM   #1376
4real is offline 4real  Netherlands
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Quote:
Originally Posted by Ro808 View Post
If you'd clone the P1805, it would save you 4 woofers. This seems also easier to build and looks less intrusive as well.
True that. It would also give the opportunity to use some better woofers (Faital 18HF500 for instance). However narrowing the "baffle" will compromise the low end quite a bit versus the 4 woofer version. On the other hand, I've had a single 15" OB running for a while, and that wasn't too bad either. Another advantage is the fact that you can upgrade this thing to a 4 woofer version quite easily.

Click the image to open in full size.
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Old 19th July 2019, 03:37 PM   #1377
silverprout is offline silverprout  France
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Quote:
Originally Posted by 4real View Post
True that. It would also give the opportunity to use some better woofers (Faital 18HF500 for instance). However narrowing the "baffle" will compromise the low end quite a bit versus the 4 woofer version. On the other hand, I've had a single 15" OB running for a while, and that wasn't too bad either. Another advantage is the fact that you can upgrade this thing to a 4 woofer version quite easily.
A larger coaxial woofer would be a lot better, especially if it match the directivity of the horn at te XO point IMHO.
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Old 19th July 2019, 08:22 PM   #1378
Ro808 is offline Ro808  Netherlands
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But that's the point.... the xo.
I expect the xo to be asymetrical with unusual slopes > there are some hints to be found in the reviews of the Bespokes.
Furthermore I don't think the concept is based on a traditional 'handover' between the horn and the woofers.

The way I see it is this: the woofers literally the create the fundament/background from which the mid-highs emerge (this implies gentle slopes).
The lack of panels eliminates associated reflections, resonances etc. and the woofers practically enfold the horn which, with the aid of dsp should result in point source like behaviour.
Moreover, the woofers and the horn acoustically 'float' in the room, therefore they're not so much sound emitting objects, but rather sound emitting sources.

Last edited by Ro808; 19th July 2019 at 08:41 PM.
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Old 19th July 2019, 08:36 PM   #1379
GM is offline GM  United States
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FWIW I did similar seemingly eons ago with 'el cheapo' Radio Shack 8", 4" 'full-range' drivers and 1st order XO component wise, but 'gapped' by ear, so with no measuring capability no clue what it was. The main difference was mine had the woofers magnet to magnet with the 'FR' clamped to them. Worked a treat on AM/FM radio, though never tried it with anything better, but see no reason why it can't make HIFI with quality components, DSP or maybe even with mid-FI components with the better DSP systems.

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Old 20th July 2019, 03:43 AM   #1380
AllenB is offline AllenB  Australia
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I don't understand why dipolers don't absorb their front walls. Not that even this is clear cut.
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