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Multi-Way Conventional loudspeakers with crossovers

B&O Beolab 90 - adjustable directivity by DSP
B&O Beolab 90 - adjustable directivity by DSP
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Old 19th January 2017, 03:02 PM   #151
multitask is offline multitask  Denmark
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Constant directivity loudspeaker designs
"The BeoLab90 tops what I have heard from any commercial loudspeaker!"
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Old 9th August 2017, 05:01 PM   #152
Patrick Bateman is offline Patrick Bateman  United States
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Originally Posted by multitask View Post
Constant directivity loudspeaker designs
"The BeoLab90 tops what I have heard from any commercial loudspeaker!"
I agree with Linkwitz.
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Old 9th August 2017, 05:02 PM   #153
wesayso is online now wesayso  Netherlands
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I agree with Linkwitz.
Now why would that be
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Old 9th August 2017, 05:05 PM   #154
Patrick Bateman is offline Patrick Bateman  United States
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I'm too lazy to read what's been published, but here's some (uninformed) things I notice about the new Beolab 50:

1) bye bye Scanspeak drivers

2) The SAW lens at the top of the speaker appears to control beamwidth mechanically. IE, the walls of the waveguide are motorized. Neat.

3) Like the Beolab 90, it's a three way loudspeaker.

4) To me, the most interesting thing is that it's a mix of three different technologies to control directivity. The high frequencies are obviously controlled by a waveguide. The low frequencies appear to use DSP beam steering. The interesting thing is that the midrange appears to be a resistive cardioid.

As usual, pretty clever engineering from the folks at B&O
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Old 11th August 2017, 03:39 PM   #155
BYRTT is offline BYRTT  Denmark
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B&O Beolab 90 - adjustable directivity by DSP
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.....As usual, pretty clever engineering from the folks at B&O
Agree there and after had a look at their whitepaper v2 is impressed they implemented modern monitoring sensors to magnets so DSP filters is temperature dependent (thermal compression compensation), also it looks verse model 90 that this time there is a "HIGH" latency mode setting that probably would improve on transients at the cost of 100mS latency should user situation could live with that delay.
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Old 11th August 2017, 07:51 PM   #156
radulescu is offline radulescu  Romania
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Agree there and after had a look at their whitepaper v2 is impressed they implemented modern monitoring sensors to magnets so DSP filters is temperature dependent (thermal compression compensation), also it looks verse model 90 that this time there is a "HIGH" latency mode setting that probably would improve on transients at the cost of 100mS latency should user situation could live with that delay.
The temperature sensor is a feature that is present in most of the B&O products since 2003.it wasps recording the temperature and it was engaging a limiter. Now in the BL90 and 50 a filter is triggered after a threshold is passed.
Also, one could also change the latency of the beolab 90 from the beginning, but it took a few software updates to get it really work well
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Old 11th August 2017, 07:54 PM   #157
radulescu is offline radulescu  Romania
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I got to see and hear them on the day they were launched but it was in a shop-in-shop so it was very noisy and a huge space Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
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Old 11th August 2017, 08:20 PM   #158
BYRTT is offline BYRTT  Denmark
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B&O Beolab 90 - adjustable directivity by DSP
Thanks clarify radulescu, about latency we don't know anything before they release visual curves or any review site share their data but step response in narrow mode for BL90 at stereophile was not very impressing, therefor personal was positive to read about "HIGH" latency mode when we have all that DSP power available and only want to listen music in stereo.
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Old 12th August 2017, 12:20 AM   #159
radulescu is offline radulescu  Romania
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In fact the thermal protection was used in their products since 1991
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Old 12th August 2017, 12:53 AM   #160
BYRTT is offline BYRTT  Denmark
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B&O Beolab 90 - adjustable directivity by DSP
Thanks but think there must be a big difference sound wise along the way if its say just a thermal limiter for protection or its both a thermal limiter for protection and also a active temperature dependent filters (thermal compression compensation). Some day they probably add even more motion sensors to correct for other smaller distortion too.
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