This is a KEF LS50W II.
Very surprising speaker with near zero hiss noise despite being an active speaker.
FR/SPL
The bass extension is 44.9hz(-6dB).
Overall, the balance is excellent, except for 1k to 2k.
Directivity
As expected of a coaxial speaker... It's really smooth, horizontal or vertical.
It's amazing that there's nothing that stands out, and it's pretty much the same orientation from about 2khz to the next.
Beamwidth
Likewise, it's a beautiful figure that doesn't deviate much from about 50 degrees and stays uniform.
Polar plot
Horizontal and vertical data almost overlap for most angles on the front.
It's also a great directional control.
THD
The approximately 100hz is due to the measured space and dip, so you should ignore it.
In 95dB SPL, over 200hz, well over 1.5%. It's a bit disappointing.
It clearly shows that the device is not suitable for playback at a high volume.
Multitone test
A distortion has appeared that remains at a maximum level of -20 dB.
This is about 10% when converted to %.
If it is a well-made speaker, I think it should be maintained at a level that does not exceed -30 to 35 dB in all bands.
Also, considering the use of the subwoofer, I put restrictions on the signal below 80hz and measured it again.(This measurement is inspired by Erin.)
It's a little bit less, but it's the same tendency.
And I overlapped these two data.
Given the constant decrease in distortion overall, it is expected that the displacement of the woofer for low regeneration will be the most significant.
And a reduction in distortion between 100 and 200 Hz is noticeable.
I measured it by increasing the output by 10 dB SPL.
Given that distortion increases in proportion to the output, this is thought to be a characteristic of this speaker, not a other factor.
Compression test
When the output was increased to 96 dB SPL, it was found that the same level of compression was applied very strongly across the entire.
This is not the characteristic of the speaker driver itself, but rather a limiter is expected to hang inside the amplifier.
(Compression cannot be this uniform with the characteristics of the driver itself.)
Anyway, it's never an advantage for loud volume playback, and when there are instantaneous peak signals in content such as movies, it seems likely that they will not be expressed dynamically relative to their intentions.
And finally, the measured FR/SPL
I took Erin's data and KEF official data and conducted cross-validation.
First is the comparison between Erin and my data.
With the exception of the LF roll-off point and some ultra-high bandwidth, the positions of the balance and various dips tend to match.
Comparison with KEF official data.
No dips was found between 1khz and 2khz.
With the exception of a weak dip of 10 kHz, the balance seems very good.
Finally, I compared the three data at once.
The KEF data, which conducted cross-validation with the two reviewer data, showed a clear difference of 1 khz and 2 khz.
The analysis of this is at your disposal.
I am not a native English speaker, and I rely mostly on translators.
Therefore, my personal evaluation of the product may cause you more misunderstanding than necessary, and I am concerned about this.
Therefore, I will put my personal assessment on hold.
So, what's your opinions?
Very surprising speaker with near zero hiss noise despite being an active speaker.
FR/SPL
The bass extension is 44.9hz(-6dB).
Overall, the balance is excellent, except for 1k to 2k.
Directivity
As expected of a coaxial speaker... It's really smooth, horizontal or vertical.
It's amazing that there's nothing that stands out, and it's pretty much the same orientation from about 2khz to the next.
Beamwidth
Likewise, it's a beautiful figure that doesn't deviate much from about 50 degrees and stays uniform.
Polar plot
Horizontal and vertical data almost overlap for most angles on the front.
It's also a great directional control.
THD
The approximately 100hz is due to the measured space and dip, so you should ignore it.
In 95dB SPL, over 200hz, well over 1.5%. It's a bit disappointing.
It clearly shows that the device is not suitable for playback at a high volume.
Multitone test
A distortion has appeared that remains at a maximum level of -20 dB.
This is about 10% when converted to %.
If it is a well-made speaker, I think it should be maintained at a level that does not exceed -30 to 35 dB in all bands.
Also, considering the use of the subwoofer, I put restrictions on the signal below 80hz and measured it again.(This measurement is inspired by Erin.)
It's a little bit less, but it's the same tendency.
And I overlapped these two data.
Given the constant decrease in distortion overall, it is expected that the displacement of the woofer for low regeneration will be the most significant.
And a reduction in distortion between 100 and 200 Hz is noticeable.
I measured it by increasing the output by 10 dB SPL.
Given that distortion increases in proportion to the output, this is thought to be a characteristic of this speaker, not a other factor.
Compression test
When the output was increased to 96 dB SPL, it was found that the same level of compression was applied very strongly across the entire.
This is not the characteristic of the speaker driver itself, but rather a limiter is expected to hang inside the amplifier.
(Compression cannot be this uniform with the characteristics of the driver itself.)
Anyway, it's never an advantage for loud volume playback, and when there are instantaneous peak signals in content such as movies, it seems likely that they will not be expressed dynamically relative to their intentions.
And finally, the measured FR/SPL
I took Erin's data and KEF official data and conducted cross-validation.
First is the comparison between Erin and my data.
With the exception of the LF roll-off point and some ultra-high bandwidth, the positions of the balance and various dips tend to match.
Comparison with KEF official data.
No dips was found between 1khz and 2khz.
With the exception of a weak dip of 10 kHz, the balance seems very good.
Finally, I compared the three data at once.
The KEF data, which conducted cross-validation with the two reviewer data, showed a clear difference of 1 khz and 2 khz.
The analysis of this is at your disposal.
I am not a native English speaker, and I rely mostly on translators.
Therefore, my personal evaluation of the product may cause you more misunderstanding than necessary, and I am concerned about this.
Therefore, I will put my personal assessment on hold.
So, what's your opinions?