B&C Speakers DCX Coaxial Driver Teardown
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- Опубликовано: 12 сен 2024
- I got my hands on one of the precious few pre-production DCX354. Of course I'm going to take it apart!
NB: If you take your DCX apart, it's very easy to break the diaphragm: the leads have to be de-soldered to remove it safely. I'll show the consequences of the way I did it here in a later video about diaphragm replacement!
Bennett is an excellent and informative video.Thank you for him. Greetings from Nikolas👍🏼
That's an extreme level of precision and engineering !!!
Excited to just see that you are up and alive. Great job!
"this one is bigger" "this will void your warranty" very inportant
Im pretty sure its actually ruled to be illegal in the US for companies to claim this and use the classic sticker that will break as evidence of opening a product...
Hey Bennett, Thanks for making such an in depth breakdown of this fascinating driver. A test I'd really love to see is a null test in the crossover frequencies. Like playing some bandpassed pink noise in the crossover band and run the drivers out of phase from each other.
Thank you for sharing! That was very cool to see. Not something I would ever hope to have to do if I get to own some of these.
It's incredible, but perhaps you will supply these drivers with beryllium diaphragm?
..and copper cap in HF section to lower Le and extend HF response perhaps...anyway it's more likely (my illation, be clear!) that 18sound would/could do a similar thing since they already use beryllium for CD and are part of the group of B&C speakers that own this brand (and Ciare too), so some sharing of know how would be "friendly" I suppose XD
Love these vids and B&C always delivers
I am very interested in these drivers and am glad to see this video. I do have a couple of questions: 1, about the patent-pending stepped diaphragm, how did you get around RCA's prior art from the 50's, where they did the same thing with cone drivers? And (2), you said disassembly would void the warranty. How do you square that with the Magnussen-Moss Warranty Act?
This one is bigger.
Loved that.
Keep up the good content.
See you at ISE?
I'll be there Tuesday and Wednesday!
@@bennettprescott nice, I only have one day between two other jobs, will try to catch you.
Thanks Bennett, really nice👍🏼
6:49 "pointy thing" start of the horn extension path?
which could be called 'impedance mismatch device' too, or better 'impedance mismatch alleviation device' :P
Exciting stuff!
Synergy horn taken to the next, next level? 🙂
hello, we bought the dcx354, any recommendations concerning amplifier? not really familiar with such designs of high sensitivity, would a normal amp of lets say 150W per channel on 8 ohms be safe for this? or bearing in mind the super high sensitivity do we need a much lower wattage... thanks in advance, i am a bit confused and dont want to burn the driver, just need some general specs of a suitable amp!
the most ingenious invention in audio in the last decade
It was announced the day that the original BMS patent (2003) expired!
@@thedubwhisperer2157 🤣🤣
why would warranty be voided? dont people do recoil’s as maintenance all the time? you guys want pros to send in that heavy thing around the world every time it needs servicing? why? you dont sell recone kits? just curious.
We sell kits, I'm going to install one in a future video. But once you've been in the driver it is no longer what we shipped from the factory, so if the seal on the side you can see me cutting early in the video is broken the warranty is void. Long story short, if you have a QA failure - report it before fixing it!
@@bennettprescott that honestly doesn't add up. Lawyers have destroyed the world.
Hi Bennett. You once mentioned that the 354 driver will have less THD than the 464. Are there any measurements availble confirming this ?
How big is the path difference between the two diaphragms ? Looking at the drawing the midrange seems to lag by about half an inch.
Will the service kits available for DCX354?
Hey great video do you know about this speaker want to put it on a motorcycle
B&C 4NDF34-8 4" Professional Neodymium
If 354 is developed, then it means that 464 is not all right?
The 464 is still the highest output, widest bandwidth driver we make. The 354 is for sure going to compress sooner, if nothing else, with hot signal. But if you need a smaller / lighter / cheaper driver, it is a really great solution!
hellow my name Thabo DE750 tn how bad it have I do have it just recommende best please
Really excited for this driver and always appreciate your videos the more info we can get about these the better. Does the ridge in the 354 act in a way that increases the effective surface area or is the benefit mostly from the decoupling effect? Maybe it's not quite the same but reminds of of the first generation powersoft m-force drivers (301P01) that came with an optional folded diaphragm but on a massive scale folded in itself which gave a 40" of surface area in the same space as the 30" standard diaphragm did. I did notice they appeared to abandon it with the most recent model however. Sorry i have even more questions, can you comment on how the distortion in the 354 compares to the 464, it was mentioned several times in marketing it was superior but how much of an improvement can we expect? Any chance of sharing waterfall graph of the 354? Last, there has been some discussion recently on soundforums.net DIY threads about if this can really compare to the 464 in the 400-650hz region with several people saying the decreased diaphragm size in the MF simply cannot compare/replace and at high power there will be a significant reduction in usable max db, how true is this? If you have spare time would be great if you could have a read of the thread and clarify what is and isn't true since it just seems to be rumors and assumptions right now. Thanks!
Also unrelated but while your reading this can you tell us anything about the 18HTX100? Is it, as the recent facebook post implies a tri-axial driver?
@@zzink the 18HTX100 is a DCX464 married to a special 18" (designed to work well at higher frequencies!), with a very large and lightweight new horn design. We're launching it at ISE in a few weeks. Should be a lot of fun, and if it is well received I'm hoping to push for a 15" version with DCX354. Of course the driver will easily outrun the 18", but more LF is easier to find than HF.
Can you link me to the thread on SoundForums.net? I can share the short answer here, for the long answer maybe we'd better use another forum - email or phone or in person even would be fantastic. bprescott@bcspeakers.com
The short answer is there's no replacement for displacement, the larger diaphragm in the 464 (and bigger coil, which heats up more slowly) is more capable. The ridge allows us to have a MF diaphragm that is very efficient even at higher frequencies despite being quite large for the given coil diameter, and narrows the gap in performance. This was a choice we weren't able to make in the DCX464, it has a traditional V diaphragm that gives up HF performance to gain Sd and therefore output at low frequencies. But it has to be crossed pretty early as a result, because it's big - so the HF driver also has to go quite low as a result. The ridge adds structural rigidity that allows the inner V to behave quite well, while keeping the performance of the whole diaphragm for use at the low frequency limit. If we applied this same diaphragm shape to the 464 it would be higher output, and the gap between the two drivers would be as you expect.
Distortion in the 354 and 464 is similar, what I mean by lower distortion is versus a system with a traditional diaphragm shape and overlap. The overlap lets the whole driver Sd work at the same time at the frequencies that are both the most important for intelligibility, and where the HF diaphragm is working the hardest. By sharing the load the two diaphragms don't need to individually work as hard - which is sort of the whole concept in the coaxial in the first place!
@@bennettprescott 15” with sub support sounds much more interesting to me than 18” alone.
@@benw2751 I feel like the angle of the horn will largely dictate how these 3-way drivers will be used, if the horn and angle is large maybe similar to ME464 size they wouldn't be too good for arraying and limited to smaller setups but could be good for a super compact FOH point source box, portable party speaker, high powered foldback/booth/wedge. I also imagine a possibility where the integrated horn is not wide like the ME464 but an 18" with a line array type horn like the ME148 joined the full height of the driver making it possible to just stack boxes of it anywhere for an instant line array effect. The internal bulb expansion section of the integrated-horn could even be designed/used simultaneously as a phase plug with the 18"? Like imagine just stacking 4-5 high of that on the floor as deployment no rigging needed for a 2-3m tall FOH system? No idea how realistic some of this is but i do love new and exotic ideas in sound :)