B&C DCX464 vs. DCX354

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meister_k

Member
Joined 2023
#1
Hi!
Anyone who heard the DCX464 and DCX354? What are the differences in sound of them?
Which compression driver would be your choice above 1khz for a club installation? The dcx464 or the dcx354?
The driver hast to play over 3x 18Sound 15NTLW3500 (80-350Hz) and a 10" Midhorn JBL 2012 (350-1100Hz).
Crossover will be active FIR with Powersoft Amps. Horn for the Coax is a Limmer 250M.
 
#5
From the Voice Coil measurements, both the high frequency drivers seem to have tons of 2nd order distortion. The DCX-354 has 4-12% distortion while playing 88-95dB/1m so I personally wouldn't want to drive it much beyond that due to both sound quality and driver damage concerns (without knowing what is causing the distortion). This seems way too low for a compression driver designed for sound reinforcement usage. It should be doing 20dB+ more output for that level of distortion. The midrange drivers seem fine though. Has anyone had a chance to verify these measurements? The B&C spec sheets don't have anything about max output levels other than power handling that I could see.
 
#7
Yes, the article said the level was set to 104dB with pink noise, but the plots for distortion showed a lower level for the sine waves being used to test harmonic distortion. So the lower level was what produced that high distortion is my interpretation. Thanks for the link to the other measured data. That looks a bit more reasonable although still not great.
 
#9
I know from my BMS Coax compressin driver - the small HF unit has VERY high H2. But it only drops in at about 7kHz - there is way less level needed up there and H2 starts at 14kHz ... you won't hear these.
Most ring radiators have higher H2 but not as extreme as these coax HF units. At very loud PA levels the BMS driver tends to get "musical"/"softer" instead of being 100% transparent. But that's >500 people venues party loudness. Where most other (older) 2" drivers give bleeding ears.

Back to topic - I'm not surprised these HF units show similar behaviour - but they cross over way lower, so it's probably more audible.
 
#10
Due to the diaphragm area the DCX354 HF section cannot extend so low as DCX464. With the crossover frequency almost an octave higher compare with DCX464 the DCX354's combining part inside the driver is more challenging due to the shorter wavelength.
 
#12
It gives an audible advantage in having no resonances in the top frequency range and still go very low on large horns. That's good enough to use them ;-)
These membranes don't move a lot, esp. for home use where they live in the 0,1W area.
 
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