Back on topic with 2 candidates:
https://audioxpress.com/article/test-bench-oberton-nd45-pro-sound-compression-driver
https://audioxpress.com/article/test-bench-oberton-nd72ct-hb-1-4-compression-driver
I'm familiar with the ND2545 (D45 predecessor) that's used in some VOID systems and rightfully praised within the German DIY community.
https://audioxpress.com/article/test-bench-oberton-nd45-pro-sound-compression-driver
https://audioxpress.com/article/test-bench-oberton-nd72ct-hb-1-4-compression-driver
I'm familiar with the ND2545 (D45 predecessor) that's used in some VOID systems and rightfully praised within the German DIY community.
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The wooden MR94 was built by a Japanse guy. He initially used the BMS 4592Nd and later switched to a Selenium phenolic driver + ST400 tweeter.
Yes and not necessarily. There are 2 advantages of such large format horns:
- Theoretically perfect directivity
- Huge 'sound'.
The main drawbacks are astigmatism, throat distortion and diffraction-related side effects. A strip of 30ppi open cell foam with a thickness of about 2 cm in the slot opening works wonders.
Seems that it's using Axi2050?
Joseph Crowe just released a video about Axi2050.
Similar conclusion from his previous measurement/listening impression.
Is the treble part that's where the problem is?
In his review after exceed certain SPL the upper part performance degrade quite a bit and didn't hit his target.
Everything was wrong.
Tonal balance first and foremost.
Think cheap PA sound.
The polar opposite of the refined, smooth and lush sound that top-notch large-format drivers and horns can produce, if done right.
is the phenolic chart very different from a plastic chart in terms of sound properties? vintage compression drivers used a lot of these.
You mean the material?
Phenolic diaphragms are made of fabric (linen) hardened with a specific (phenolic) resin. Basically somewhat similar to soft domes.
Most phenolic compression drivers don't make it past 10 kHz, but they usually sound very good > notable examples are the JBL and Community drivers.
Phenolic diaphragms are made of fabric (linen) hardened with a specific (phenolic) resin. Basically somewhat similar to soft domes.
Most phenolic compression drivers don't make it past 10 kHz, but they usually sound very good > notable examples are the JBL and Community drivers.
yess sorry for the horrible google translate 😀 is the B& DCM50 with their paper diagram sounds more like the phenolic CD than the kapton ones ?
For those who are not familiar with compression drivers, it may be useful to draw inspiration from existing commercial products (not necessarily Klipsch).
At least I bought some compression drivers after listening to both PA and Hi-Fi/high end speakers in which they were used.
I really liked the mid/highs of the hi-fi speakers. However, the 8" woofer could not quite keep up with the comp. driver,
making the tonal balance somewhat lightweight/bass shy with some music. Despite the small waveguide the xo point was already fairly low (1200 Hz).
So there seemed to be potential for a combination with a bigger woofer, a larger waveguide + xo point below 1000 Hz, and that's what I did.
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I expect the DCM to handle the low mids better, but my experience with phenolic is limited to some vintage 1" drivers that should be used >1000 Hz.
ro808
we are talking compression drivers here, and citing Klipsch as a very poor implementation. How to design a proper horn based system is a different thread and the parameters are very restrictive IMO.
Why the Axi sounded so crappy in the Jubi is yet another subject. I suspect the electronics and the DSP are the culprits. Cut all that stuff out, use a passive network and use a tube amp and then we can talk.
we are talking compression drivers here, and citing Klipsch as a very poor implementation. How to design a proper horn based system is a different thread and the parameters are very restrictive IMO.
Why the Axi sounded so crappy in the Jubi is yet another subject. I suspect the electronics and the DSP are the culprits. Cut all that stuff out, use a passive network and use a tube amp and then we can talk.
speak of the devil, someone bought up Klipsch Jubilee implementation of Celestion Axi2050 in the comments section of Joseph Crow's latest full test and final review of Celestion Axi2050
LOL! Seriously biased opinion that could not be substantiated with any scientific rigeur.
Folks, it shouldn't come as a surprise that discussions on a forum are biased. In this case, it is biased by my listening to the system. Clearly something that whoever designed the Jubilee didn't really do.
I wonder if you did listen to the Jubi.
BTW I have DSP on my system. I am a dinosaur but I accept technology. Simplify, dissecting and rebuilding the speakers from the ground up is what I would do.
I am still curious about the Axi and the horn combo on the Jubi. People that I respect here have spoken very highly about these so I was really taken aback by how bad the implementation was.
I wonder if you did listen to the Jubi.
BTW I have DSP on my system. I am a dinosaur but I accept technology. Simplify, dissecting and rebuilding the speakers from the ground up is what I would do.
I am still curious about the Axi and the horn combo on the Jubi. People that I respect here have spoken very highly about these so I was really taken aback by how bad the implementation was.
Maybe just a poor crossover? I remember a GOTO system at a show with a very bad crossover. It ruined the system. Such a shame.
One of many things that could have made this loudspeaker not meet expectations. Valves and passive crossovers are not the solution.
If you refer to the Klipsch Jubilee, it "features an external active DSP crossover network".
I'm also using DSP, but fwiw the best systems I've listened to - either horn loaded or direct radiating, were all tube based.
I'm also using DSP, but fwiw the best systems I've listened to - either horn loaded or direct radiating, were all tube based.
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sure ia small compression driver as tweeter in the center of the Horn would help the Axi form 5K to 20K and not try to correct the 20db differences with DSP .. but it surely not be very design commercialy friendly 🤔
If so, totally inexcusable on a big-buget, supposedly top-of-the-line speaker system by a long-established mainstream manufacturer.
We are NOT dealing with a boutique artisanal brand here!