The HF204 is basically a HF144 with an adaptor. If you don't need a 2" you can as well use a HF144.
The B&C prototype elliptical horn shown in the B&C coax thread would probably be nice for the HF1440 as well. But I guess if there is no need to cross below, say 700 Hz, an LTH142 would probably also be nice.
Regards
Charles
The B&C prototype elliptical horn shown in the B&C coax thread would probably be nice for the HF1440 as well. But I guess if there is no need to cross below, say 700 Hz, an LTH142 would probably also be nice.
Regards
Charles
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.
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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
)
The HM4750-SLF is bi-radial horn with slot.
The HL4750SLF is basically a slightly modified/upgraded JBL 2386.
If you can live with a slightly higher cut-off and get a wider dispersion as a bonus, this truncated clone is a better deal:
The HL4750SLF is basically a slightly modified/upgraded JBL 2386.
If you can live with a slightly higher cut-off and get a wider dispersion as a bonus, this truncated clone is a better deal:
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This is the one I have:
JBL Selenium HM4750-SLF 2" Throat Bolt On Large Fiberglass Bi Radial Horn 90x40 | eBay
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.
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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:
While the Selenium does:
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.
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.
A larger coaxial woofer would be a lot better, especially if it match the directivity of the horn at te XO point IMHO.
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.
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.
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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.
GM
GM
