I sincerely apologize for the significant delay in posting this review. Thank you to everyone who patiently waited.
This review marks a milestone, as it is the first time I’ve measured a total of 11 samples simultaneously, thanks to the collaboration of the manufacturer and individual owners.
It was a monumental project for me personally.
Let’s dive in.
The curve is generally flat, with the bass roll-off extending to approximately 33.6 Hz at -6dB (relative to the 100–10kHz average) before descending at a slope of 40dB/octave.
To validate my measurement system against the manufacturer’s NFS (Near-Field Scanner) system, I had to cross-check results using their official sample.
The differences between the two curves stem from subtle response variations between the microphones used. For further details, please refer to the C5B review linked below.
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All components of the loudspeaker are neatly executed.
The estimated crossover frequency is around 1.1kHz, which is impressively low. Achieving such clean and robust performance at this frequency is no small feat.
Let’s examine this further in the THD and MD sections.
The speaker exhibits exceptionally smooth directivity.
Attenuation and diffraction effects are also well-controlled.
Wow... it’s hard not to be amazed.
Who could imagine such vertical directivity coming from a 6.5-inch 2-way speaker? The result is incredibly flat and stunningly beautiful.
The smoothly controlled directivity ensures excellent tolerance near the crossover frequency.
The result is close to ideal.
On the vertical plane, the energy radiation patterns for each frequency band converge uniformly. Impressive!
Extremely low and clean THD...
Particularly around 1kHz, the performance is almost unbelievable.
Considering the crossover point is approximately 1.1kHz, one would expect a slight rise in distortion somewhere between 800Hz and 1.5kHz.
However, the manufacturer has achieved balanced directivity while maximizing acoustic efficiency through exceptional waveguide and crossover design.
Higher acoustic efficiency means the tweeter doesn’t need to move as much, resulting in lower distortion and a cleaner overall performance.
Even at 95dB SPL @1m, the performance remains rock solid.
I reviewed all 11 samples. Most performed exceptionally well, but one sample exhibited unusually high second harmonic distortion.
Upon discovering this during the review process, I immediately reported the issue to the manufacturer. They responded promptly, stating they would retrieve the affected sample from the customer and conduct a thorough analysis.
This is the perfect marriage of high-quality materials and expert craftsmanship.
For a 2-way speaker, the multitone distortion (MD) performance is astoundingly clean.
Paired with a subwoofer, the performance could be even more powerful.
The compression performance is exceptionally strong, recording levels so low that they’re nearly within the margin of measurement error.
I compared a total of 11 samples, calculating the relative response of the remaining 10 samples against the manufacturer’s reference sample.
This review marks a milestone, as it is the first time I’ve measured a total of 11 samples simultaneously, thanks to the collaboration of the manufacturer and individual owners.
It was a monumental project for me personally.
Let’s dive in.
Impedance
Frequency Response
The curve is generally flat, with the bass roll-off extending to approximately 33.6 Hz at -6dB (relative to the 100–10kHz average) before descending at a slope of 40dB/octave.
To validate my measurement system against the manufacturer’s NFS (Near-Field Scanner) system, I had to cross-check results using their official sample.
The differences between the two curves stem from subtle response variations between the microphones used. For further details, please refer to the C5B review linked below.
AsciLab C5B Review.
Today, I’ll be reviewing the AsciLab C5B, which features a 5.25-inch woofer along with two passive radiators. For this review, I measured one official sample provided by the manufacturer and another pair owned by an individual who had purchased the product personally. Impedance The...
audiosciencereview.com
Nearfield Measurement
All components of the loudspeaker are neatly executed.
The estimated crossover frequency is around 1.1kHz, which is impressively low. Achieving such clean and robust performance at this frequency is no small feat.
Let’s examine this further in the THD and MD sections.
Directivity
The speaker exhibits exceptionally smooth directivity.
Attenuation and diffraction effects are also well-controlled.
Wow... it’s hard not to be amazed.
Who could imagine such vertical directivity coming from a 6.5-inch 2-way speaker? The result is incredibly flat and stunningly beautiful.
Beamwidth
The smoothly controlled directivity ensures excellent tolerance near the crossover frequency.
Polar Plot
The result is close to ideal.
On the vertical plane, the energy radiation patterns for each frequency band converge uniformly. Impressive!
THD (Total Harmonic Distortion)
Extremely low and clean THD...
Particularly around 1kHz, the performance is almost unbelievable.
Considering the crossover point is approximately 1.1kHz, one would expect a slight rise in distortion somewhere between 800Hz and 1.5kHz.
However, the manufacturer has achieved balanced directivity while maximizing acoustic efficiency through exceptional waveguide and crossover design.
Higher acoustic efficiency means the tweeter doesn’t need to move as much, resulting in lower distortion and a cleaner overall performance.
Even at 95dB SPL @1m, the performance remains rock solid.
THD 85dB SPL @1m (11 Samples)
I reviewed all 11 samples. Most performed exceptionally well, but one sample exhibited unusually high second harmonic distortion.
Upon discovering this during the review process, I immediately reported the issue to the manufacturer. They responded promptly, stating they would retrieve the affected sample from the customer and conduct a thorough analysis.
Multitone Test
This is the perfect marriage of high-quality materials and expert craftsmanship.
For a 2-way speaker, the multitone distortion (MD) performance is astoundingly clean.
Paired with a subwoofer, the performance could be even more powerful.
Compression Test
The compression performance is exceptionally strong, recording levels so low that they’re nearly within the margin of measurement error.
Deviation Between 11 Samples
I compared a total of 11 samples, calculating the relative response of the remaining 10 samples against the manufacturer’s reference sample.
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