True. Some are more focused on SPL than SQL. Some state that you can't really hear issues in the transient domain bellow 50Hz and that it is pointless to address or try to fix the cabinet such that maximum transient (low group delay) is displayed sub 50Hz or even 100Hz.
I do not agree to such views - the speed of a woofer determines the overall clarity of the loudspeaker. A slow bass/sub bass makes the whole loudspeaker sound bloated and sluggish.
I'd rather have a loudspeaker that is fast, aka have stellar performance, compared to heaps of SPL output, because listening to elevated levels (90-95dB or more) for a prolonged time is very unusual.
Some PA brands should sent to him their best measuring devices... though PA drivers ask 18" to 15" to have a little low fhz...
big big if no individual listening room !
big big if no individual listening room !
It's actually pretty interesting... this is the expectation and seems to be quite intuitive, but it is not always the case.
Let's look for example at the SB15NBAC30.
We see that H3, H4 and H5 barely change when going from 2.83 V to 5.6 V input. So, if we use the higher level as a baseline, we see that half the voltage and half the excursion are not going to deliver half the distortion (no matter how you calculate the "half"). Of course, many drivers have distortion that scales up at least 1:1 with input and excursion.
Strangely, you see more of this behaviour with tweeters than with woofers.
Right, I see what you are getting at. The individual distortion does not change, so in that regard I agree.
What I was getting at is that typically, when you demand less excursion for a given SPL, the cone will travel less and do the same job due to a companion. Less motion equal less material stress.
So while the individual driver's distortion remain the same, the system (loudspeaker) will express less distortion compared to using a single woofer.
Some evidence for this statement can be found in looking at distortion in low signal vs high signal input. Very few drivers maintain the same harmonics profile, but again the exception, so there are drivers that indicate the same harmonic distortion as the voltage increase.
I wouldn't go so far as to say that this is a rule, but more as an indicator or potential benefits of using multi vs single woofers. Every rule has exceptions and so does this one.
🙂
What I was getting at is that typically, when you demand less excursion for a given SPL, the cone will travel less and do the same job due to a companion. Less motion equal less material stress.
So while the individual driver's distortion remain the same, the system (loudspeaker) will express less distortion compared to using a single woofer.
Some evidence for this statement can be found in looking at distortion in low signal vs high signal input. Very few drivers maintain the same harmonics profile, but again the exception, so there are drivers that indicate the same harmonic distortion as the voltage increase.
I wouldn't go so far as to say that this is a rule, but more as an indicator or potential benefits of using multi vs single woofers. Every rule has exceptions and so does this one.
🙂
The measurements of a ceramic dome midrange out of legendary Victor Zero-100 loudspeakers:
JVC HSD5204-01A (midrange from Victor Zero 100) | HiFiCompass
JVC HSD5204-01A (midrange from Victor Zero 100) | HiFiCompass
Could you please measure some SB ceramic version if you have some of them, like:
SB17CAC35-8
SB26CDC 0004
It'd be really interesting to see how they compare with the aluminum cone/dome versions, particularly distortion measurements.
The SB26CDC was measured on this page :
SB ACOUSTICS SB26CDC-C000-4 (Tweeter 1", 4 Ohm, 200 Wmax)
Very good measurements, just like the SB26ADC. Personally I don't think there will be much difference, if any, between the aluminum and the "ceramic" (anodized aluminum) versions.
However, one driver that does not seem to have been reviewed or measured anywhere is the small SB12CAC (for which there is no aluminum version for some reason). Since the BAC/CAC family measures so well, I would be curious to see what this small driver can do in the higher midrange.
4” SB12CACS25-4 / Ceramic – Sbacoustics
SB ACOUSTICS SB26CDC-C000-4 (Tweeter 1", 4 Ohm, 200 Wmax)
Very good measurements, just like the SB26ADC. Personally I don't think there will be much difference, if any, between the aluminum and the "ceramic" (anodized aluminum) versions.
However, one driver that does not seem to have been reviewed or measured anywhere is the small SB12CAC (for which there is no aluminum version for some reason). Since the BAC/CAC family measures so well, I would be curious to see what this small driver can do in the higher midrange.
4” SB12CACS25-4 / Ceramic – Sbacoustics
the nac tweeter has a biger bump but beyond 20 k...
looks like the cac tweeter has a little fantasy perhaps towards 6K hz that can be ringy ? Don't know if one can hear it though cause it's very little bumpy but ears are sensible also here. I like the dip and the power response towards 2K to 4/5 K hz 🙂...
max spl ?
looks like the cac tweeter has a little fantasy perhaps towards 6K hz that can be ringy ? Don't know if one can hear it though cause it's very little bumpy but ears are sensible also here. I like the dip and the power response towards 2K to 4/5 K hz 🙂...
max spl ?
Thanks for this info, I have these guys ( 17CAC and 26CDC) on going 2way flooring. I just want to know how good they are. 🙂
That's actually pretty great performance especially considering the price. Third harmonic barely moves with drive level and the 4th and 5th don't show any peaks creeping in at higher drive levels either. It'll easily handle sub 2kHz crossovers too.
The tweeter deserves in making for it the rectangular flange of 90 mm height.
Though, at this price point...😕
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I suppose at this price point you can afford to route into the tweeter faceplate when creating the rebate for the driver that sits below it, bringing them closer together.
Like this...
Even if it is a pain to do.
Like this...
Even if it is a pain to do.