I like the vintage RCF artwork.
By the way, that's the N481, behind the hornlens.
By the way, that's the N481, behind the hornlens.
An externally hosted image should be here but it was not working when we last tested it.
Before I start to come across as a RCF fanboy, I am not.
Whilst the ND series are overall very good, I wouldn't buy their older RCF ND3020 driver.
Even the 850 series can sound harsh, especially with the all-metal diaphragm.
Similar to the B&C drivers:
Whilst the ND series are overall very good, I wouldn't buy their older RCF ND3020 driver.
Even the 850 series can sound harsh, especially with the all-metal diaphragm.
Similar to the B&C drivers:
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The RCF ND3020-T3 aka EAW DN20-3003:
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The reason why all-metal diaphragms remain popular, has to do with the prolonged high output levels common in PA.
Mylar/Polymer suspensions are subject to softening, or even melting due to the heat generated by the
system.
"...And that's why these are called soft-suspensions"
Mylar/Polymer suspensions are subject to softening, or even melting due to the heat generated by the
system."...And that's why these are called soft-suspensions"
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No, unfortunately JBL does not deem it necessary to design horns (for compression drivers) that work below 800Hz, since the introduction of the PT horns.
If you don't mind a very narrow dispersion, this one's cut-off is at 400Hz:
It's a clone of the Selenium HL4750-SLF, which is essentially a modernized JBL 2386, a Flat Front Bi-Radial 40° H x 20° V horn,
designed to be used with 2441, 2445, 2446, 2450 2" drivers.
I am not sure if it works with your drivers, but some members of the Klipsch Forum like it a lot.
And so do the people from G.I.P. Laboratory, apparently (it's in the speakers with the silver (Selenium?) bullets on top):
If you don't mind a very narrow dispersion, this one's cut-off is at 400Hz:
It's a clone of the Selenium HL4750-SLF, which is essentially a modernized JBL 2386, a Flat Front Bi-Radial 40° H x 20° V horn,
designed to be used with 2441, 2445, 2446, 2450 2" drivers.
I am not sure if it works with your drivers, but some members of the Klipsch Forum like it a lot.
And so do the people from G.I.P. Laboratory, apparently (it's in the speakers with the silver (Selenium?) bullets on top):
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At RCF they know a thing or two about horn design too.
Take the H100 for example.
Below is a page from a 1990's RCF catalog, even the old N481 is included.
Today, the H100 is still one of the very best horns for 1" drivers.
Some people prefer it to the SEOS and the famous QSC PL-000446GP waveguides,
because the H100 REALLY doesn't sound like a horn.
Take the H100 for example.
Below is a page from a 1990's RCF catalog, even the old N481 is included.
Today, the H100 is still one of the very best horns for 1" drivers.
Some people prefer it to the SEOS and the famous QSC PL-000446GP waveguides,
because the H100 REALLY doesn't sound like a horn.
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mitchba, I forgot your JBL 2453h-SL is a 1.5" exit driver.
You'll need an adapter for that Selenium horn, if these exist at all.
The JBL experts are on audioheritage, as you'll know.
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I would take a look on Chinese compression drivers and apply aquaplas that vastly improve IMD at breakup. Cost effective solution.
Slightly more on-topic, has anyone found a supplier for the Celestion driver?
If the pricing is what's claimed on the first page, they'd be an interesting upgrade for my PA system.
TIA,
Chris
If the pricing is what's claimed on the first page, they'd be an interesting upgrade for my PA system.
TIA,
Chris
In the past, I have contacted several Chinese suppliers.
Clone drivers are available for next to nothing: DE250 for $5-10 each, DE500 for 20-25, etc.
However you'll have to place bulk orders. Shipping individual units is quite expensive.
I was tempted to buy a pair of these though, with both diaphragms:
Clone drivers are available for next to nothing: DE250 for $5-10 each, DE500 for 20-25, etc.
However you'll have to place bulk orders. Shipping individual units is quite expensive.
I was tempted to buy a pair of these though, with both diaphragms:
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The JBL PT clone horns above, are probably better than the original JBLs.
The throat is completely smooth, whereas the JBLs have tiny diffraction slot.
You would probably have to polish some rough edges, leftover from the molding.
The throat is completely smooth, whereas the JBLs have tiny diffraction slot.
You would probably have to polish some rough edges, leftover from the molding.
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The BM750 cost 50% of a ND950.
Here is the FR + PH of the MK2 diaphragm, technically choosable IMO (Tractrix 350 at the exit no EQ no smoothing)
PS : sorry i've forgot to remove the shelving high shelf filter (6dB at 4K)
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Where can we find these?
I have been using the small 6x6 PT waveguide for about 10 years now in a small speaker and have been very happy with it, I would love to get an 8" version of it.